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首页> 外文期刊>Plant and Soil >Impact of the plant community composition on labile soil organic carbon,TI Impact of the plant community composition on labile soil organic carbon, soil microbial activity and community structure in semi-natural grassland ecosystems of different productivity
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Impact of the plant community composition on labile soil organic carbon,TI Impact of the plant community composition on labile soil organic carbon, soil microbial activity and community structure in semi-natural grassland ecosystems of different productivity

机译：不同生产力的半天然草地生态系统植物群落组成对不稳定土壤有机碳，土壤微生物活性和群落结构的影响

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Aims The main objective was to describe the effects of plant litter on SOC and on soil microbial activity and structure in extensively managed grasslands in Central Germany that vary in biomass production and plant community composition. Methods The decomposition of shoot and root litter was studied in an incubation experiment. Labile C and N were isolated by hot water extraction (C-HWE, N-HWE), while functional groups of microbes were identified by PLFA analysis and microbial activity was measured using a set of soil exo-enzymes. Results The plant community composition, particulary legume species affected SOC dynamics and below-ground microbial processes, especially via roots. This was reflected in about 20% lower decomposition of root litter in low productivity grassland soil. The C-HWE soil pool was found to be a key driver of the below-ground food web, controlling soil microbial processes. Conclusions Below-ground responses appear to be related to the presence of legume species, which affected the microbial communities, as well as the ratio between fungal and bacterial biomass and patterns of soil enzyme activity. Low productivity fungal-dominated grasslands with slow C turnover rates may play an important role in SOC accumulation. The approach used here is of particular importance, since associated biological and biochemical processes are fundamental to ecosystem functioning.
机译：目的主要目的是描述植物凋落物对SOC的影响以及对德国中部广泛管理的草地生物量产生和植物群落组成不同的土壤微生物活性和结构的影响。方法采用孵化实验研究枝条和根凋落物的分解。通过热水萃取（C-HWE，N-HWE）分离出不稳定的C和N，同时通过PLFA分析鉴定微生物的官能团，并使用一组土壤外切酶测量微生物活性。结果植物群落组成，特别是豆科植物物种，尤其是通过根系，影响了SOC动态和地下微生物过程。这反映在低生产力的草地土壤中，根凋落物的分解降低了约20％。人们发现，C-HWE土壤库是地下食物网的主要驱动力，可控制土壤微生物过程。结论地下反应似乎与豆类种类的存在有关，豆类种类影响微生物群落，以及真菌和细菌生物量之间的比率以及土壤酶活性的模式。 C转换速率低的低生产力真菌为主的草原可能在SOC积累中起重要作用。这里使用的方法尤为重要，因为相关的生物和生化过程是生态系统功能的基础。

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