- Open Access
Enhanced aboveground biomass by increased precipitation in a central European grassland
© The Author(s). 2018
- Received: 19 September 2018
- Accepted: 18 November 2018
- Published: 12 December 2018
Global climate change is projected to increase temperature and alter precipitation pattern, which could affect grassland ecosystem. Long-term observation at a field experiment can be a powerful approach to explore the impacts of climate change on biomass productivity in grassland. In attempting to understand how climatic variability regulates biomass productivity, we analyzed long-term records of temperature and precipitation to examine how variation of temperature and precipitation across 19 years affect biomass productivity.
We established the experiment with 64 plots in two blocks and planted 31 species in 30 different mixtures. We harvested aboveground biomass twice a year, sorted biomass by functional groups, and weighed dry biomass. The site was mown after each harvest. We did not apply any fertilizer and water. Using linear regression model, we examined the influences of growing season temperature and precipitation on biomass productivity.
The results showed that aboveground biomass productivity in September and annual were significantly increased in post-drought (2003–2015). The relationships of aboveground biomass productivity with growing season precipitation were significantly positive. The results showed that aboveground biomass productivity in June and annual were sensitive to growing season temperature. The relationships of aboveground biomass productivity of the functional group of grasses with early growing season temperature were significantly negative. Early growing season precipitation had a significant positive effect on aboveground biomass productivity of the functional groups of grasses and legumes. Post-drought aboveground biomass productivity of the functional groups of grasses in June and September were declined, whereas legumes significantly increased, which suggests that the role of dominant grasses may shift by legumes with global climate change.
Our results highlight that early and late growing temperature and precipitation variability may reduce the aboveground biomass productivity in grassland. Our study implies that the combination of several functional groups is essential for the maintenance of stable productivity in temperate grassland ecosystem.
- Aboveground biomass
- BIODEPTH experiment
- Climate change
- Functional groups
- Grassland biodiversity
- Hay meadow
- Precipitation variability
- Temperate grassland
- Temperature variability
Studying the effects of climate change on plant communities is an important research goal in ecology and gaining increased importance under global warming. Several experimental studies (Tilman and Downing 1994; Grime et al. 2000; Jentsch et al. 2007; Wang et al. 2007; Bloor et al. 2010; Butof et al. 2012; Walter et al. 2012; Backhaus et al. 2014; Urbina et al. 2014; Gargallo-Garriga et al. 2015; Gellesch et al. 2015; Isbell et al. 2015; Ludewig et al. 2015; Malyshev et al. 2015) have investigated the effects of climate change on plant productivity. A range of studies (Knapp et al. 2008; Beierkuhnlein et al. 2011; Kreyling et al. 2011b; Weißhuhn et al. 2011) have revealed that the functioning of grassland species is affected by drought.
Precipitation is one of the most influential abiotic factors for plant productivity in almost all terrestrial ecosystems (Lieth 1975; Webb et al. 1986; Sala et al. 1988; Huxman et al. 2004). Several studies (Beierkuhnlein et al. 2011; Jentsch et al. 2011; Walter et al. 2012) have revealed that the magnitude of the rainfall events and their seasonal frequency are important for temperate grassland productivity. IPCC scenarios have shown that precipitation pattern will be altered in the course of climate change (IPCC 2007). According to regional climate change projections, Germany will experience higher temperature and an increasing risk for summer droughts in the late twenty-first century (Görgen et al. 2010).
Plant community ecologists have long been interested in how plant functional groups (grasses, herbs, and legumes) influence primary productivity of an ecosystem. The mass ratio hypothesis (Grime 1998) predicts that the effects of species of an ecosystem are dependent on species functional groups. Several plant functional groups are important for above- and belowground biomass production and can increases over 300% more biomass than monoculture species (Tilman et al. 2001) and have a complementarity effect (Huston et al. 2000; McLaren and Turkington 2010). Shallow- and fibrous-rooted grasses have suffered from lower precipitation and higher temperature (Fay et al. 2003; Morecroft et al. 2004; Grant et al. 2017); however, deep-rooted herbs and legumes can maintain productivity (Sage and Kubien 2007; Kakani et al. 2008). Some studies (Grime et al. 2000; Weißhuhn et al. 2011; Craine et al. 2012; Jentsch et al. 2014) have revealed that growing season temperature is not the driving factor; rather, growing season precipitation (Duncan and Woodmansee 1975; Fay et al. 2003) regulated the grassland productivity. However, it is not clear whether early or late growing season temperature and precipitation have significant influence on aboveground biomass productivity.
Hay meadows are one of the most species-rich terrestrial ecosystems in Europe (Veen et al. 2009; García-Feced et al. 2015) and managed for conservation purposes (Dahlström et al. 2013). Hay meadows are permanent ecosystem and need attention in the face of climate change. A range of experiments (Beierkuhnlein et al. 2011; Jentsch et al. 2011; Kreyling et al. 2011a; Backhaus et al. 2014; Urbina et al. 2014; Gargallo-Garriga et al. 2015; Gellesch et al. 2015; Malyshev et al. 2015) in Germany have conducted to understand the effect of climate change on hay meadows and grassland. BIODEPTH (BIODiversity and Ecological Processes in Terrestrial Herbaceous Ecosystems) is such an experiment, which was established in 1996 at eight sites across Europe with a view to assessing plant diversity and primary productivity (Hector et al. 1999). One site of this experiment has been established at Lindenhof, Bayreuth, Germany, by the Department of Biogeography, University of Bayreuth.
To investigate the response of aboveground biomass production of hay meadow to temperature and precipitation variability
To determine whether several functional groups buffer adverse effects of increased growing season temperature and precipitation or amplify the dominance pattern on biomass production
Higher growing season temperature negatively affects the aboveground biomass of hay meadow
Growing season precipitation variability adversely affects the aboveground biomass of hay meadow
Dominance patterns of functional groups explain variance in aboveground biomass production
Several functional groups buffer adverse effects of increased growing season temperature and precipitation variability
The experiment was carried out at the German site of the former BIODEPTH project. The study site is situated at Lindenhof, Bayreuth (49° 55′ N, 11° 35′ E, altitude 355 m a.s.l.). The experimental layout was based on BIODEPTH concept of identical design at eight sites across Europe (Hector et al. 1999). The study site’s annual precipitation is 709 mm, and average annual temperature is 8.2 °C. The experiment was established on a former arable land, where the soil consists of keuper marl from trias, and the soil type is brown soil-pseudogley with variable mixture.
The soil was a loamy to sandy stagnic gleysol with pH (CaCl2) = 5.65 ± 0.20. Soil carbon content was 0.78 ± 0.06% in 1996 and 0.77 ± 0.10% in 2002. Soil nitrogen content was 0.08 ± 0.01% in 1996 and 0.13 ± 0.01% in 2002 (Kreyling et al. 2011a). In 2002, no differences were observed between two blocks in case of C/N ratio (P = 0.446), nitrogen contents (P = 0.640), and carbon contents (P = 0.373) (Kreyling et al. 2011a).
Species pool studied
Thirty-one traditional grassland species were allocated with different mixtures at the experiment in 1996 (Appendix). Since September 1998, no weeding was done, so species from neighboring plots and surrounding vegetation intruded.
Management of experimental site
During 1996–1998, non-target species were weeded to avoid the competition with the target species. Since 1999, the succession was allowed to take place as weeding was stopped after final harvest in September 1998. No fertilization and watering were done during the whole study period. After each harvest of aboveground biomass, field site was mown. Therefore, mowing was done twice a year (June and September). The paths between the plots were not mown since 1998. This allows the chance of other species to invade the surrounding plots. The field site was protected by the fence to avoid grazing by herbivores. Unfortunately, in August 2001, some sheep entered into the site and destroyed biomass partly. That is why, the aboveground biomass of few plots in September 2001 reduced.
Aboveground biomass harvest
Aboveground biomass was harvested twice (June and September) a year by two samples of 20 cm × 50 cm within the central square meter (1 m × 1 m) of each plot. At each harvest, vegetation was cut 5 cm above the ground. Each sample biomass was collected in the polythene bag. Biomass was sorted by functional groups. Sorted biomass was taken in a paper bag and then dried at 80 °C for 24 h and finally weighed in the laboratory of Department of Biogeography at the University of Bayreuth.
Temperature and precipitation
Daily temperature and precipitation data across 19 years were obtained from the German Weather Service station in Bayreuth.
Data handling and statistical analyses
All statistical analyses were performed using R statistical software. We used simple linear regression based on 19 years of dataset.
Aboveground biomass production
Biomass responses to temperature variability
Biomass responses to temperature variability excluding the extreme event
Biomass responses to precipitation variability
Biomass responses to precipitation variability excluding the extreme event
Performance of functional groups in pre-drought and post-drought
Functional group response to the early growing and late growing season temperature
Functional group response to the early growing and late growing season precipitation
Aboveground biomass productivity
Despite opposite trends of aboveground biomass productivity in June and September harvests, there was an increasing trend of annual aboveground biomass productivity across 19 years. Aboveground biomass productivity was not significantly responded in pre-drought (1997–2002). However, aboveground biomass productivity in September and annual sum were significantly increased in post-drought (2003–2015) period. Our findings are consistent with Jentsch et al. (2011), who found that annual primary productivity was not declined to drought, and Grant et al. (2017) who showed that productivity increased by 12% due to increased warming.
Biomass responses to temperature variability
Our results showed a significant decrease in aboveground biomass in June and annual sum with the increase of growing season temperature (Fig. 3a, c), which is consistent with Weißhuhn et al. (2011) and Jentsch et al. (2014) who found that biomass production decline with warming. Grime et al. (2000) found that grassland biomass of a 5-year experiment was declined by winter heating, and Sternberg et al. (1999) and Kahmen et al. (2005) showed that experimental drought events reduce biomass productivity which is also consistent with our findings. Our results are in accordance with the hypothesis stating that growing season temperature increase has negative effects on aboveground biomass productivity. However, our findings are inconsistent with Beierkuhnlein et al. (2011) and Ma et al. (2017) who found that warming has no or very limited influence on biomass productivity. Two recent studies revealed that warming significantly increase the biomass (Chen et al. 2017) and growing season air and soil warming has also positive impacts on aboveground biomass productivity on the Qinghai-Tibetan Plateau (Guo et al. 2018). A growing body of evidence suggests that higher growing season temperature can lower biomass productivity by reducing water availability and limiting photosynthesis (Knapp et al. 2008) and increasing evapotranspiration (Reichstein et al. 2006; De Boeck et al. 2011). Higher growing season temperature can generate physiological stress (Crafts-Brandner and Salvucci 2002) and stimulate root growth instead of shoot growth (Asseng et al. 1998).
Biomass response to precipitation variability
Like many other studies (Lauenroth and Sala 1992; Sternberg et al. 1999; Grime et al. 2000; Kahmen et al. 2005; La Pierre et al. 2016), our results showed a significant increase in aboveground biomass productivity in June and September with the increase of growing season precipitation (Fig. 5a, b). Our results are consistent with Walter et al. (2012) who found that aboveground biomass altered with precipitation variability, Grant et al. (2014) who observed that high intra-annual precipitation variability decrease biomass production compared to low intra-annual precipitation variability, and Ru et al. (2017) who found that precipitation reduction severely affect plant productivity. Apart from European grassland, Lauenroth and Sala (1992) found a positive correlation between aboveground net primary production and precipitation using a 52-year dataset in North America, and Ma et al. (2017) found that higher precipitation increase 17.5% community biomass in alpine grassland on the Tibetan Plateau. Our results are in accordance with the hypothesis stating that growing season precipitation increase has positive effects on aboveground biomass production. However, our findings are inconsistent with Fay et al. (2003) who revealed that aboveground biomass production was not responded or negatively responded with increasing precipitation.
Performance of functional groups to temperature and precipitation variability
The significant increase of aboveground biomass productivity of the functional group of legumes in post-drought (Fig. 7b, d) in our study may be the reason for fertilization effects of nitrogen-fixing legumes. Our results coincide with Huston et al. (2000), who commented on an article of Hector et al. (1999) and showed that a single species of legume has strong positive effects on aboveground biomass productivity in eight sites of BIODEPTH experiment across Europe. The increase of total aboveground biomass productivity across 19 years could possibly be due to the complementarity effect of the functional groups of grasses, herbs, and legumes, i.e., reduction of grasses biomass compensated by herbs and legumes. Chen et al. (2017) found that legumes biomass increased by 27.6% in warming treatment which supports our findings that legumes in post-drought increased significantly in June and September harvests. Our results showed that the aboveground biomass productivity of the functional group of grasses declined in post-drought (Fig. 7b, d), which are consistent with the findings of Fay et al. (2003), Morecroft et al. (2004), and Grant et al. (2017).
Early growing season and late growing season temperature influenced aboveground biomass productivity of the functional groups of grasses, herbs, and legumes across 19 years. The relationships of aboveground biomass productivity of the functional group of grasses with early growing season temperature in September were significantly negative (Fig. 8c), which is consistent with Guo et al. (2018), who found that pre-season warming reduces aboveground biomass productivity. Late growing season temperature has also significant negative effects on aboveground biomass productivity of the functional groups of herbs (Fig. 8f, h) and legumes (Fig. 8 j).
Aboveground biomass productivity of the functional groups of grasses in June (Fig. 9a) and legumes in September (Fig. 9k) were significantly increased with the increase of early growing season precipitation. Our findings are consistent with Chelli et al. (2016) who found that early season precipitation has a positive response to aboveground net primary productivity and Zavaleta et al. (2003) who found that precipitation timing influences biomass productivity in Mediterranean grasslands. Several studies (Suttle et al. 2007; Chelli et al. 2016, and Ru et al. 2017) have revealed that early growing season precipitation influences plant productivity and favors plant growth, which coincides with our results.
Shallow- and fibrous-rooted grasses uptake water from upper part of the soil profile, and hence, the increase of early growing season precipitation means availability of soil moisture in topsoil which can be utilized by grasses. Likely reasons for varying behavior of grasses, herbs, and legumes to early growing season precipitation may be due to plant root structure, adaptation strategies, the presence of nodules, root depth, etc. The results of functional groups biomass also revealed that declining grasses biomass was compensated by herbs and legumes which is consistent with McLaren and Turkington (2010) who found that removal of one functional group compensated by other functional groups in terms of biomass recovery and Tilman et al. (2001) who explored that several functional groups produce 300% higher biomass compared to single functional group.
Growing season temperature and precipitation yielded three key findings: (1) early growing season temperature has significant negative effects on aboveground biomass productivity of the functional group of grasses in September, (2) late growing season temperature has significant negative effects on aboveground biomass productivity of the functional groups of herbs and legumes in June harvest, and (3) early growing season precipitation has significant positive effects on the aboveground biomass productivity of the functional groups of grasses in June and legumes in September. This apparent discrepancy is probably because it is not early or late growing season precipitation (Duncan and Woodmansee 1975; Fay et al. 2003), rather late growing season temperature is a strong limiting factor in aboveground biomass productivity (Grime et al. 2000; Weißhuhn et al. 2011; Craine et al. 2012; Jentsch et al. 2014) of herbs and legumes. These results highlight the importance of different functional groups for grassland ecosystem functioning in the face of climate change.
European hay meadows are sensitive to global climate change. The drought has significant effects on aboveground biomass productivity in a long-run experiment. Our study shows that aboveground biomass productivity in September and annual significantly increase in post-drought, but decrease in the pre-drought period. We demonstrate that environmental drivers (temperature and precipitation) are important in grassland productivity. The responses of aboveground biomass to growing season temperature and precipitation are different. For instance, aboveground biomass in June declines significantly with growing season temperature, whereas aboveground biomass in June and September increases with growing season precipitation. Our study provides new empirical evidence that the relationships of dominant grasses with early growing season temperature in September are significantly negative and with early growing season precipitation in June and September are significantly positive. Aboveground biomass productivity of the functional group of herbs is sensitive to late growing season temperature. Early growing season precipitation has strong positive effects on the aboveground biomass productivity of the functional group of legumes in September. Our study suggests that the presence of several functional groups is vital in sustaining grassland productivity and ecosystem functioning. Incorporating a more thorough understanding of how growing season temperature and precipitation affect aboveground biomass productivity is necessary to advance our understanding of grassland biomass productivity dynamics in the face of climate change.
Our first and foremost thanks go to the researchers who collected data year after year at this long-term study site. We are thankful to the reviewers for the constructive comments on the manuscript. We are grateful to the Department of Biogeography, University of Bayreuth, for maintaining the experimental site and providing the datasets. We extend our gratitude to German Weather Service Station in Bayreuth for sharing the climate datasets. We are also thankful to Mr. Reinhold Stahlmann, Department of Biogeography, University of Bayreuth, for his assistance during data collection.
The original datasets have been preserved at the Department of Biogeography, University of Bayreuth, Germany.
The BIODEPTH project was funded by the European Commission within the Framework IV Environment and Climate program (ENV-CT95-0008) and coordinated by Prof. Dr. Carl Beierkuhnlein, Department of Biogeography, University of Bayreuth, Germany.
Availability of data and materials
The authors declare that the data and materials presented in this manuscript can be made publicly available by Springer Open as per the editorial policy.
CB designed the experiment, supervised the data collection, monitored the experiment, preserved the dataset, and edited the manuscript, and M.L. Hossain designed the protocol, collected the samples for two growing seasons, analyzed the data, prepared all figures, and wrote the manuscript. Both authors contributed to the writing of the manuscript, read and approved the final manuscript. This manuscript is a part of M.Sc. dissertation prepared by M.L.H. and supervised by C.B., submitted to the University of Bayreuth, Germany, for the partial fulfillment of M.Sc. degree Global Change Ecology.
M.L. Hossain is currently pursuing Ph.D. in the Department of Geography at Hong Kong Baptist University, Hong Kong. M.L.H obtained M.Sc. in Global Change Ecology from the University of Bayreuth, Germany. He achieved his B.Sc. and M.Sc. in Environmental Science from the University of Chittagong, Bangladesh. He works as a Lecturer (on study leave from 2018 to 2021) in the Department of Environmental Protection Technology, German University Bangladesh, Gazipur, Bangladesh. C. Beierkuhnlein is the Chair of Biogeography, and Head of the graduate program (M.Sc.) “Global Change Ecology” (within the Elite Network of Bavaria), University of Bayreuth, Germany. During 2005–2007, C.B. was the Dean of the Faculty of Biology, Chemistry and Geosciences, University of Bayreuth, Germany. He is a member of the editorial board of Basic and Applied Ecology and Journal of Applied Vegetation Science.
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