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通过对黄土丘陵沟壑区典型侵蚀环境下人工种植刺槐林的坡面上坡顶、坡肩、坡背、坡脚和坡趾5个不同地形部位上的微生物生物量碳、氮及微生物的代谢活性和功能多样性进行测定和分析,探讨侵蚀环境下坡面尺度上微生物的空间分布规律。研究结果发现,在侵蚀比较容易发生的坡肩位置,微生物的含量总体比较低,微生物生物量碳在坡顶、坡背和坡脚位置含量比较高,微生物生物量氮在坡顶和坡背位置含量比较高。微生物的代谢活性与微生物量没有表现出完全的一致性,0-10 cm土层表现为坡肩和坡背的微生物代谢活性最高,和这两个位置的微生物功能多样性较高比较一致,10-20 cm土样微生物功能多样性较为一致,微生物的代谢活性与微生物生物量的大小关系相对较为密切,表现为坡脚和坡背位置的代谢活性比较高。对于6种不同类型的碳源的利用,0-10 cm土壤的微生物对糖类物质的利用率最高,而10-20 cm土壤的微生物对氨基酸类物质的利用率最高。
Based on the metabolic activities of microbial biomass carbon, nitrogen and microorganisms in five different terrain areas of slopes, slope shoulders, slope backs, slope feet and slope toes of artificial planted Robinia pseudoacacia under typical erosion in the Loess Hilly and Gully Region And functional diversity were measured and analyzed to investigate the spatial distribution of microorganisms on the slope scale under erosion environment. The results showed that microbial biomass was generally low at the position of slope shoulder where erosion was relatively easy to occur, and microbial biomass carbon was relatively high at the top of hillside, slope back and foot, microbial biomass nitrogen at top of hillside and backside The content is relatively high. The metabolic activity of microorganisms did not show complete agreement with microbial biomass. The 0-10 cm soil layer exhibited the highest metabolic activity of microorganisms on sloping shoulders and slopes, and the higher microbial functional diversity of the two locations was consistent. 10 The functional diversity of microorganisms in -20 cm soil was consistent, and the metabolic activity of microorganisms was relatively close to that of microbial biomass, showing the higher metabolic activity at the position of slope foot and slope back. For 6 different types of carbon sources, 0-10 cm soil microorganisms had the highest utilization of sugars, while 10-20 cm soil microorganisms had the highest utilization of amino acids.