贺兰山东麓不同植被类型土壤微生物功能多样性研究

Study on the Functional Diversity of Soil Microorganisms in DifferentVegetation Types on the Eastern Foothills of Helan Mountain

本文以4种典型植被类型土壤为对象,研究土壤微生物功能多样性分布规律以及生物-非生物驱动因素。结果显示:(1)随着植被类型变化,土壤微生物利用单一碳源的能力出现差异;其中高山草甸土壤微生物代谢活性最高,荒漠草原最低。碳水化合物、羧酸类化合物和氨基酸是土壤微生物主要利用的碳源。(2)各植被类型土壤微生物功能多样性指数中,土壤微生物Shannon指数、Mclntosh指数均表现为青海云杉最高,荒漠草原最低;Simpson指数表现为高山草甸最高。(3)海拔、年均降雨、年均温、水蒸腾压、太阳辐射是对不同植被类型土壤微生物产生差异的主要因子。

In this paper,the distribution of soil microbial functional diversity and biotic-abiotic driving factors were studied in four typical vegetation types of soils.The results showed that:(1)The ability of soil microorganisms to utilize single carbon source was different with the change of vegetation type.The metabolic activity of soil microorganisms was highest in alpine meadows and lowest in desert grasslands.Carbohydrates,carboxylic acids and amino acids were the main carbon sources used by soil microorganisms.(2)The Shannon index and Mclntosh index of soil microbial functional diversity index of all vegetation types were the highest in Picea crassifolia and the lowest indesert steppe.Simpson index was the highest in alpine meadow.(3)Altitude,average annual rainfall,average annual temperature,water transpiration pressure and solar radiation at altitude were the main factors causing differences in soil microorganisms among different vegetation types.