Distribution Characteristics and Influencing Factors of Soil Microbial Biomass Nitrogen and Phosphorus in Two Grassland Types in Inner Mongolia
Inner Mongolia grassland is the most important natural barrier in the north of China,Soil microbi-al biomass nitrogen(MBN)and phosphorus(MBP)can reflect the potential of microorganisms to seques-ter soil nutrients,and it is critical to investigate the distribution characteristics and driving factors of soil microbes in different grassland types to maintain ecosystem function.In this study,the distribution charac-teristics of MBN and MBP in different grassland types and their relationships with climatic,biotic and abi-otic factors were explored by sample plot survey and indoor analysis in two grassland types,typical and desert steppe in Inner Mongolia.The results showed that MBN and MBP of typical grassland were signifi-cantly higher than those of desert grassland;MBN of desert steppe was significantly positively correlated with annual mean precipitation(P＜0.05);MBN of typical grassland was significantly positively correlated with annual mean temperature(P＜0.05),but significantly negatively correlated with annual mean precipi-tation(P＜0.05).MBP was not correlated with annual mean temperature and annual mean precipitation.Structural equation modeling showed that the driving factors of MBN and MBP in both grassland types were root N and root P contents.This study deepens the knowledge of microbial nitrogen and phosphorus response to climate change and provides a theoretical basis for maintaining and protecting the nutrient cyc-ling function of arid and semi-arid ecosystems.
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