Adopting novel ecosystems as suitable rehabilitation alternatives for former mine sites
© Doley and Audet; licensee Springer. 2013
Received: 22 February 2013
Accepted: 25 June 2013
Published: 11 July 2013
The nature and extent of environmental disturbance associated with mining commonly entails completely new and challenging combinations of climate, lithology and landform. Consequently, the outcomes of ecological processes associated with the recovery or restoration of ecosystems cannot be predicted reliably from previously known associations between their physical and biological components. For radically disturbed sites, we propose that it is not practicable to aim for the restoration of historical ecosystems. However, hybrid (reversibly different) or novel (irreversibly different) ecosystems comprising new combinations of physical and biological components, including both native and non-native species, could provide levels of stability and functionality acceptable to all stakeholders and within feasible management regimes. We propose that limiting physical conditions of the landscape can be identified and managed, and that alternative species combinations for introduction to these new landscapes may be considered with cautious optimism.
KeywordsNatural ecological analogues Novel ecosystems Mining Landscape suitability
The goal for rehabilitation of mined land is often to restore the pre-disturbance land use or ecosystem (Queensland DEHP 2012), although different levels of biodiversity and ecosystem function can be negotiated between the mining proponent and regulator. In either case, it is commonly assumed that the essential physical resources assembled during the rehabilitation process—namely landform, lithology and soil—will closely resemble conditions of the pre-disturbance environment. While this assumption can be valid for certain degraded agricultural, forest or pastoral lands (Ferris et al. 2000; Chazdon 2008; Bullock et al. 2011; Tongway and Ludwig 2011), it may not be equally applicable to many mine sites, where there are radical changes to almost every component of the landscape as well as persistent non-natural landscape features (e.g. open-pits, waste heaps) (Cooke and Johnson 2002; Bens and Hüttl 2005; Norman et al. 2006; Herath et al. 2009; Tozer et al. 2012). Since land rehabilitation becomes increasingly more difficult with increasing size and severity of the disturbance impact, many authors have justifiably questioned whether targeting historical and/or pre-disturbance ecosystems (i.e. “going back to the past”) is always the most appropriate restoration goal in these post-industrial environments, particularly within the range of feasible biological and socioeconomic outcomes (Harris et al. 2006; Choi 2007; Seastedt et al. 2008). Yet, finding suitable alternatives which meet the needs of conservationists, practitioners and regulators in light of these unavoidable challenges remains elusive (Jackson and Hobbs 2009).
At the very least, this depiction recognizes potential barriers to achieving veritable restoration in relation to the requirements of rehabilitating landscape hierarchies of increasing complexity (e.g. biodiversity interactions < biodiversity assemblages < nutrient and/or hydrological cycles < landform assemblages < geology and climate). However, there has been some reluctance in approaching the rehabilitation of highly assertive anthropogenic activities from a similar perspective, possibly out of fear of lowering rehabilitation standards (see Perring et al. 2013 in this issue). This apprehension is especially acute regarding those lucrative industries, such as mining, that have drastic environmental impacts that impose high ecological liabilities and whose post-disturbance landscapes have so few parallels in the natural realm (Foster et al. 1998).
Setting mine site rehabilitation goals based on post-disturbance landscape assessments
Hierarchies of site information for analyses of functional landscapes †
Is the abiotic system altered?
a. Landform class
b. Landform pattern
c. Landform element
d. Quantitative attributes
i. nutrient status
ii. water status
Is the biotic system altered?
a. Species richness
c. Structural class
Is the abiotic system altered? Significance of climate, geology and landform
Climate is a major determinant of vegetation development (Harris et al. 2006)—particularly in reconstructed environments (Audet et al. 2012)—and recent warming has displaced latitudinal ranges of some species by about 17 km per decade (Chen et al. 2011). However, these climatic changes are likely to be overshadowed by radical changes in the states of land zones (degree of consolidation, origin and geomorphology), all of which hierarchically influence ecosystem patterns and processes for a given vegetation type (Sattler and Williams 1999). Within each bioregion, regional ecosystems (REs) are defined by some government conservation agencies as native vegetation communities consistently associated with particular combinations of land zone and soil (Sattler and Williams 1999). Notably, some variation in species composition of the vegetation community can be accommodated by a single RE, and mixing of REs may be recognized (Neldner et al. 2012). The scale at which REs are mapped is influenced by the activities under consideration, whereby high intensity activities such as mine site rehabilitation may require a resolution of 1:20,000 or 1:25,000 (0.8–1.7 ha) (Neldner et al. 2012). At these scales, relatively fine details of land form together with the lithology and pedology of a reconstructed site can be determined accurately (Tongway and Ludwig 2011). Meanwhile, land surveys can discriminate more subtle differences in landform so that assessment of a target vegetation community could be tempered by local variations in land capability (Tongway and Ludwig 2011). With this information, a critical first-step for mine site rehabilitation is to consider the following questions (cf. Figure 2):
Is the pre-disturbance landform reinstated?
Does the new landscape condition meet the pre-disturbance criteria?
Are soil integrity and fertility intact?
Based on these criteria, the historical REs could be used as targets for rehabilitation only if the post-disturbance landscape units are judged by the environmental regulator to bear a reasonable physical resemblance to these environments. Such conditions may occur when a relatively thin layer of material is removed (bauxite mining; Koch 2007) or the bulk of the material can be returned without drastic physical or chemical alteration (sand mining; Smith and Nichols 2011). Reports on the progress and success of mine rehabilitation in Australia are relatively sparse and unevenly distributed (Cristescu et al. 2012). However, successful mine lease extinguishment has followed the attainment of completion criteria in a bauxite mine in Western Australia (Gardner and Bell 2007), and progress towards this goal has been recorded in Australia for other bauxite mines (Gould 20112012; Tongway and Ludwig 2011) and sand mines (Herath et al. 2009; Gravina et al. 2011; Smith and Nichols 2011).
When selecting between natural or novel rehabilitation outcomes, this RE approach assumes that geomorphological processes will have resulted in a land surface with a relatively predictable pattern of variation in soil characteristics (cf. Table 1), resulting in a predictable vegetation community (Burgess 2003). If quantitative comparison of the abiotic characteristics of the disturbed landscape and that of the known historical RE (predicted or extant) do not correspond within defined limits (Burgess 2003; Tongway and Ludwig 2011), it may be necessary to consider an alternative or hybrid vegetation association for establishment on that land unit—preferably one that incorporates multiple components from the historical landscape while also accommodating potentially novel or non-natural elements (e.g. waste rock heaps and open pits) based on landform components found within the RE. Ideally, pre-mine planning (Warhurst and Noromba 2010) would predict the range of landforms and lithologies that could be assembled in the final landscape to ensure that the rehabilitation outcome aligns as closely as possible with the essential function and attributes found nearby or more broadly within the RE (Worrall et al. 2009). By definition, further rehabilitation inputs invested over time could facilitate the restoration of pre-disturbance landform criteria among hybrid ecosystems; however, this goal cannot be claimed for novel ecosystems given the irreversible crossing of abiotic thresholds (Hobbs et al. 2013). Nevertheless, the approach would still be conducive to the development of rehabilitated ecosystems bearing features and capabilities similar to those found within the broader bioregional mosaic.
Is the biotic system altered? Influence of soils
Once essential landform elements are reconstructed, typical rehabilitation schemes assume that the physical requirements for the development of a desired vegetation type could be assembled almost immediately after the disturbance has ceased (Australia DIRT 2006). For example, the replacement of retained bioactive topsoil (containing indigenous seeds and beneficial microbes) on reconstructed landscapes has been shown to facilitate the reestablishment of native and/or keystone vegetation and the reinstatement of pre-existing REs (Bell 2001; Queensland DEHP 2012). Such rehabilitation has been successful following mineral sand mining on the south-eastern coast of Queensland Australia (Smith and Nichols 2011) and bauxite mining in Western Australia (Gardner and Bell 2007; Koch 2007; Grant 2009; Tongway and Ludwig 2011) in which the biogeochemical composition of the post-disturbance landform and substrates was not significantly different from the pre-disturbance conditions. Outside of these examples, the reshaping of the landscape and disturbance of topsoil is likely to have different ecological consequences depending on the underlying landform and lithology due to both obvious and subtle losses of matrix structure and reductions in nutrient status and microbial viability (Cooke and Johnson 2002; Bradshaw 2004; Bens and Hüttl 2005; Banning et al. 2012). Therefore, commensurate changes may be required in the identification of target vegetation associations where there is a fundamental change in both the physical and chemical attributes of a land unit. These circumstances give rise to questions relating to the post-mining environment (cf. Figure 2):
Are beneficial soil components intact?
Do rehabilitated soils support a distinct vegetation type(s) conforming to pre-disturbance land zone criteria?
Do soils support rare, endemic or environmentally sensitive flora?
Does climate/seasonality represent a significant obstacle for revegetation?
Critical abiotic properties with significant impacts on the biotic system being rehabilitated are the propensity of the site for erosion, the amount of plant available water in the rooting zone, soil pH, fertility and salinity (Schmidt et al. 1999; Schneider et al. 2010). As described previously, if the soil characteristics of the reconstructed site cannot be specified closely, the specification of the vegetation association cannot be very precise. The difficulty of such prediction can be demonstrated by considering a very detailed soil and vegetation analysis carried out over 300,000 ha in central Queensland, Australia (Burgess 2003), the setting for intensive mining of coal (and coal-seam gas), gold, silver, limestone, magnesite and gemstones. Sixty-nine soil profile types were identified on landscapes ranging from steep slopes to flat clay pans and flood plains derived from igneous, metamorphic and sedimentary rock types. In the central Queensland environment where evaporation exceeded rainfall, one of the major limitations to plant survival was salinity, and many of the soils were dispersive on account of high sodium contents so they were prone to erosion. The first requirement for post-mining sites is that they be safe, stable and non-polluting (Queensland DEHP 2012). In many mining situations, the resulting landform properties (cf. Table 1) may have predictable surface and soil characteristics that may be associated with vegetation associations that are different from the historical and are potentially novel. If the rehabilitated environment is required to support a particular historical vegetation type, then appropriate actions (such as modifying fertility and moisture parameters) must be taken to bridge the gap between the characteristics of the post- and pre-disturbance environments. These actions may require decades and extensive management inputs for completion, so identification of realistic and achievable end-points is necessary to account for changes in rehabilitation planning.
Is the biotic system altered? Influence of vegetation
Another matter for consideration is the manner in which vegetation types coexist on multiple soil types. In central Queensland, Burgess (2003) described 42 vegetation associations according to the procedures described by Neldner et al. (2012) covering sufficiently large areas to be analyzed. For all of the 69 soil profile types, there was no unique association with a given vegetation type, but between two and six vegetation associations could be found on any soil profile type. Where one soil type was examined at more than one location, the dominant vegetation association sometimes differed between locations. This variation could indicate that there is a stochastic component to the occurrence of vegetation on soil types or that subtle changes in vegetation associations are the result of the separation of localized niches for different species (Austin et al. 2009) that are not related to the variables assessed by Burgess (2003). It also underlines the practicality of mixed RE categories at broad mapping scales for setting rehabilitation goals (Neldner et al. 2012) compared to the common strategy of targeting a particular soil-vegetation assembly and perhaps relatively narrow rehabilitation outcomes. If specific vegetation associations are identified for replacement in particular landform elements, it must be assumed that the necessary physical conditions can be provided. Where these assumptions cannot be met, different vegetation associations might be expected to occur regardless of the nature of the topsoil that is spread over the substrate.
In view of the sometimes pronounced differences in vegetation associations that occur with relatively small differences in soil profile type (Audet et al. 2013), rehabilitation contract conditions that require the establishment of only local ecotypes of pre-existing species on a reconstructed landscape may not be fulfilled. Species selection could be based on scenario modelling of landscape function analysis (Guisan and Zimmermann 2000; Tongway and Ludwig 2011) and the identification of functional groups that are most likely to survive in the new conditions (Grant et al. 2002; Bradshaw 2004; Wagner 2004), particularly to allow for climatic and seasonality obstacles to revegetation. It may be necessary to compromise local biodiversity in order to achieve stable vegetation cover by early introduction of the major structural and functional components of vegetation associations that might be expected to survive in the post-disturbance abiotic environment (Koch 2007). A consequence of this would be that a broad list of species from the bioregion should be tested for incorporation in rehabilitation procedures, including fast growers vs. slow growers, or native vs. non-native species (Shackelford et al. 2013a). This would require a change in perceptions since the criteria for assessment of the success of species establishment might be based first on ecological function analysis (Tongway and Ludwig 2011), second on biodiversity criteria (Eyre et al. 2011), and third on a commitment to timely management intervention based on ecosystem developmental trajectories as well as final target outcomes (Grant 20062009; Shackelford et al. 2013b).
Are desired ecosystem characteristics achieved? Requirements for ecological services
The final component of our decision tree refers to the condition requirements for maintaining or reinstating and managing natural ecological disturbance regimes. In an Australian context, this means optimizing the effects of fire and mitigating the effects of weeds, pests and seasonal conditions on both vegetation and fauna (Hobbs 2004; Chazdon 2008; Bullock et al. 2011). In short, this task inquires of the rehabilitated ecosystems (cf. Figure 2):
Do rehabilitated ecosystems provide stable and manageable habitat?
Are historical ecosystem functions achieved?
Ecosystem stability is defined as variation in structure and condition (Eyre et al. 2011) within the historical range of variability (Suding and Hobbs 2009), and a manageable habitat is defined as that which can be maintained in a stable condition by intervention that is both practical and economical (Grant 2006). Unfortunately, there are no general or rapidly applied indicators of stability for novel ecosystems due not only to the potentially complicated and site-specific requirements for ecosystem assembly (Koch 2007; Bullock et al. 2011; Tongway and Ludwig 2011), but also to the fluid socioeconomic boundaries typically associated with post-mining land rehabilitation (Gardner and Bell 2007; Worrall et al. 2009; Warhurst and Noromba 2010; Smith and Nichols 2011). Compared with the costs of land preparation for most other rural industries, mined land rehabilitation is expensive, even for sites such as bauxite mines, where disturbance is relatively limited (Gardner and Bell 2007). In addition, resource limitations (e.g. lack of topsoil, toxicity or salinity of substrate) often limit the extent to which the historical ecosystem conditions can be approached (Grant et al. 2002; Madsen and Mulligan 2006).
Expectations for highly disturbed (and lucrative) mining activities are that rehabilitated ecosystems should recover relatively soon after the disturbance and in proportion to investment of resources, often regardless of the size and severity of the disturbance (Australia DIRT 2006). Paradoxically, because soil and subsurface properties may be changed radically, rehabilitation success can only be assessed effectively over longer timelines and preferably using multiple ecological indicators and endpoints (e.g. Block et al. 2001; Nichols and Nichols 2003; Craig et al. 2012; Williams et al. 2012; Critescu et al. 2013; Majer et al 2013). The determination of the stability of novel or alternative ecosystems is one activity for which adaptive management may be most appropriate. Part of this management process would be the development and refinement of quantitative indicators of site and ecosystem condition. Convergence of rehabilitated environments toward target ecosystems is most likely to occur where physicochemical alteration of the substrate has been limited, the climate has suitable temperatures and distribution of rainfall, and the soil-surface conditions are favorable or may improve over time (Norman et al. 2006; Koch 2007; Smith and Nichols 2011; Audet et al. 2012). Rehabilitation efforts can then be focused on facilitating conditions in support of stable habitat and manageable ecological regimes, e.g. integration of seasonal fire (Grant et al. 2007) and/or low intensity grazing (Tongway and Ludwig 2011; Firn et al. 2013 in this issue). However, where the post-disturbance environment has an altered nutritional status and/or contains seeds of less desirable species (e.g. exotic or selected pasture grasses), repeated attempts at introducing natural ecological regimes may fail and even cause further divergent outcomes (Tongway and Ludwig 2011). It then follows that restoration of natural ecological regimes and habitat would remain incomplete or in a state of arrested development if left unmanaged (Grant 20062009). Meanwhile, truly hybrid or novel site conditions may not have ecosystem characteristics that have been previously described, other than those which can be predicted from the broader RE.
For these reasons, we suggest that rehabilitation goals for highly disturbed areas such as mine sites should be set by agreement among the industry, regulator and relevant stakeholders at the highest feasible level (e.g. the pre-disturbance RE) − as envisaged in the New Zealand Resource Management Act (Pokhrel and Dubey 2012) − but should allow for adjustment of the goal in the light of circumstance (Worrall et al. 2009). Each agreed change of goal should be preceded by a thorough and objective analysis of the physical environmental and socioeconomic conditions (Pokhrel and Dubey 2012), so that the highest attainable environmental outcomes are delivered.
Many studies have been carried out on the suitability of mine sites for the early establishment of vegetation (e.g. Bell and Bellairs 1992; Huxtable et al. 2005; Madsen and Mulligan 2006; Courtney and Mullen 2009) and the subsequent outcomes of rehabilitation (Mulligan 1996; Menzies and Mulligan 2000; Koch 2007; Gravina et al. 2011; Vickers et al. 2012). Therefore, determining the range of predictable outcomes for hybrid or novel ecosystems can be achieved based on properties found naturally in broader REs. However, apart from reports on fire and tree thinning (Koch 2007; Craig et al. 2010) and microhabitat management (Christie et al. 2013) in rehabilitated bauxite mines in Western Australia, there are few accounts of the longer term ecological and associated site management processes that may be involved. In order to avoid compromising higher standards of rehabilitation, a careful and cautious approach based on the best available data should be applied when determining the range of vegetation types most suitable for a given soil and vegetation classification, followed closely by appropriate management inputs required to maintain stable habitats and ecological function.
Rehabilitation of highly disturbed landscapes such as mine sites may not provide realistic opportunities for the ecological processes normally associated with ecosystem recovery to occur. Consequently, it may be more helpful to put aside theoretical considerations of ecosystem development to focus on the pragmatic requirement of securing conditions that are safe, stable and non-polluting, and that provide suitable environments for vegetation establishment and ultimately habitat development. The target ecosystems may be quite different from those that occupied the site prior to disturbance, and they may be difficult to discern at the planning stage of a mining operation. This lack of a clear rehabilitation goal necessitates careful analysis of the available evidence at each stage of planning and operations, and a willingness and capacity to adjust goals according to the best practice that can be achieved with the expectation that it will be overtaken in the future by something better.
The fact that some mine leases have been relinquished indicates that successful rehabilitation is possible. The fact that the number of abandoned, pending, dormant or inactive leases exceeds the number that have been relinquished shows that the path to mine site rehabilitation is not smooth or direct. We consider that the first requirement for rehabilitation is a careful analysis of the physical environment, followed by the identification and consideration of possible amelioration treatments, and the progressive development of a manageable final landscape—this, no matter whether it is defined as being natural, hybrid or novel. Regardless of the final landscape, we conclude that it will not become self-managing but will always require some intervention, ideally minimizing resource requirements while optimizing resource outputs or ecosystem services. Successful rehabilitation management depends on a continual increase in understanding of the system under management and an ability and willingness on the part of all stakeholders to achieve the optimum ecosystem outcomes.
The definition of ecosystem conditions associated with disturbance and recovery has been clarified greatly by Hobbs et al. (2013) and has evolved over a decade of consideration regarding assembly rules (Temperton et al. 2004) and the desirability of identifying stable ecosystems that are different from those pre-dating the disturbance (Hobbs and Norton 1996; Hobbs and Suding 2009; Hobbs et al. 2009) and that may be described as novel (Hobbs et al. 20062009) or alternative to historical ecosystems (Cale and Willoughby 2009). The terms used here derive from Mascaro et al. (2013) referring to ecosystems that are not: “(1) a [historical ecosystem] that would have occupied that space in the past (i.e. part of a historical range of variability); (2) a system managed intensively for specific production or built over; or (3) a [hybrid ecosystem] managed with the purpose of reproducing the historical ecosystem (i.e. classic restoration).” Central to this concept is the nature of thresholds between ecological states (Hobbs et al. 2009; Suding and Hobbs 2009), and whether transition across a threshold is reversible or not. Crucially, Hobbs et al. (2013) have proposed that novel ecosystems are an outcome of irreversible transfer across abiotic or biotic thresholds. Within a novel ecosystem, it is possible to have either biotic or abiotic conditions that are very similar to those of a historical ecosystem; however, restoration cannot be claimed to have occurred unless both abiotic and biotic conditions are sufficiently similar to those of a historical ecosystem. In order to guide activities on intensively managed lands, the goals of restoration or rehabilitation need to be clarified and, where possible, quantified; especially the feasibility of attaining a particular restoration or rehabilitation goal (Choi 2007; Bullock et al. 2011). As emphasized here, the same conditions apply perhaps even more forcefully to severely disturbed lands such as mine sites.
Glossary of ecological terms
Restoration: Intentional activity that initiates or accelerates the recovery of an ecosystem with respect to its health, integrity and sustainability.; Historical: Variation in ecosystem state that is within the historical range of variability.; Hybrid: Ecosystem state within which an ecosystem is modified from the historical state by moderate and reversible changes to characteristics involving loss or addition of species (biotic) and/or land use change (abiotic).; Novel: Ecosystem state within which systems have potentially been changed irreversibly by large modification to abiotic conditions (climate, geology, landform or land use) and/or biotic composition (loss of existing species or addition of invasive species).; Reversible threshold: A limiting ecosystem state at which a transition to a different state is possible with practicable management inputs.; Irreversible threshold: A limiting ecosystem state at which a transition to a different state is not possible without the application of large and possibly impracticable management inputs.; Stability: Variation in structure and condition within the historical range of variability.; Manageable ecosystem: One that can be maintained in a stable condition by intervention that is both practical and economical.
The authors wish to thank the two anonymous reviewers and Guest-Editor (M Perring) for their beneficial commentary which contributed highly to improving this manuscript for publication. Special thanks are also extended to M Perring and RJ Hobbs for providing early access to the compilation book Novel ecosystems: Intervening in the new ecological world order by RJ Hobbs, ES Higgs and CM Hall (eds). This study was made possible by funding to P.Audet from The University of Queensland and the Natural Sciences and Engineering Research Council (NSERC) of Canada.
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