荒漠草原2种植物群落土壤微生物及土壤酶特征

Characteristics of Microorganisms and Enzyme Activity under Two Plant Communities in Desert Steppe

测定和分析了甘肃省金昌市金川区荒漠草原土壤微生物数量、微生物生物量和土壤酶活性。结果表明:同层土壤3大类微生物(真菌、细菌和放线菌)数量、土壤微生物量碳和氮含量及4类土壤酶(蔗糖酶、脲酶、磷酸酶和过氧化氢酶)活性均表现为盐爪爪(Kalidium foliatum)群落大于骆驼刺(Alhagi sparsifolia)群落,而土壤微生物量磷含量相反;同一植物群落,不同层土壤微生物数量(除骆驼刺群落中的真菌亚表层最高外)、土壤微生物量碳、氮、磷含量及土壤酶活性(除骆驼刺群落中脲酶呈现高-低-高-低趋势外)均呈现随土层的加深而降低的趋势;金川区荒漠草原不同植物群落不同空间层次土壤微生物数量、微生物生物量和各种酶之间有不同程度的相关性。

Soil microbial quantities, microbial biomass and enzyme activity of desert steppe ecosystem under different plant communities in desert steppe in Jinchang, Gansu, China were studied in this paper. The re- sults showed that the changes tendency of soil microbial quantities, microbial biomass C, N and enzyme ac- tivity of community dominated by Kglidium foliatum were much higher than that of the community domi- nated by Alhagi sparsifolia, while the microbial biomass P opposite. The number of soil microbial （bacteria and actinomycetes）, microbial biomass （C, N, P） and enzyme activity decreased with the soil depth in vege- tation coverage, The soil urease showed a ＂high-low-high-low＂ trend and maximum fungus in the subsurface layer of soil in community of A. sparsifolia grassland. Meanwhile, the result of correlation analysis indica- ted that there were significant correlation among soil microbial quantities, soil microbial biomass and soil en- zyme activity.