Divergent responses of plant biomass and diversity to short-term nitrogen and phosphorus addition in three types of steppe in Inner Mongolia, China

Ecological Processes

Table 1 Location and basic characteristics of the three steppe sites of Inner Mongolia, China

Site	Location	MAT (℃)	MAP (mm)	Vegetation	Dominant	Soil	pH	SOC (g kg⁻¹)	TN (g kg⁻¹)	TP (g kg⁻¹)
Site	Location	MAT (℃)	MAP (mm)	type	species	type	pH	SOC (g kg⁻¹)	TN (g kg⁻¹)	TP (g kg⁻¹)
MG	48° 55ʹ N, 119° 11ʹ E	− 0.84	362	Meadow steppe	Leymus chinensis, Carex duriuscula	Calcic Chernozems	6.60	21.79	2.09	0.44
TG	43° 94ʹ N, 115° 86ʹ E	2.28	256	Typical steppe	Stipa krylovii, Convolvulus ammannii	Haplic Kastanozems	8.34	19.77	2.09	0.38
DG	41° 70ʹ N, 110° 10ʹ E	7.09	284	Desert steppe	Stipa krylovii, Heteropappus altaicus, Convolvulus ammannii	Calcic Kastanozems	8.90	6.93	0.70	0.38

Climatic variables, including mean annual temperature (MAT) and mean annual precipitation (MAP) (1998–2018) for each site, were derived from the China Meteorological Data Service Centre (http://data.cma.cn)
SOC soil organic carbon, TN soil total nitrogen, TP soil total phosphorus