Seasonal Dynamics of Soil Microbial Biomass and Enzymatic Activities in Alpine Grasslands of the Eastern Qilian Mountains
The soil microbial biomass and enzymatic activities in Polygonum viviparum alpine grassland(PG),grass alpine grassland(GG) and Kobresia capillifolia alpine grassland(KG) in the Eastern Qilian Mountains in the Qinghai-Tibetan Plateau,China were studied.The results showed that the microbial biomass carbon (MBC) increased first,then decreased and increased with seasons,maximum value appeared in July and the minimum in September.However,the seasonal dynamics of microbial biomass nitrogen (MBN) and the microbial biomass phosphorus (MBP) was different.The ratios of MBC/SOM and MBN/STN were 0.16％ ～ 0.84％ and 0.48％ ～ 2.03％,respectively.Their seasonally dynamics showed a similar trend to the MBC and MBN.The ratios of MBC/MBN,MBC/MBP and MBN/MBP were 3.19 ～ 20.55,4.38 ～ 49.74 and 1.11 ～ 3.56,respectively.The maximum of MBC/MBN occurred in July and the minimum in September.The enzyme activities in soil showed seasonal change,maximal unease activity in soil of Polygonum viviparum alpine grassland and Kobresia capillifolia alpine grassland occurred in September,grassland in July.The neutral phosphatase activities (NPA) in soil of Polygonum viviparum alpine grassland decreased from May to July,increased from July to September,and then gradually decreased after September.However,the neutral phosphatase activities in soil of grass land and Kobresia catpillifolia alpine grassland firstly decreased from May to July or September,and then increased again.
NETL
NSTL
万方数据
维普
