农业用地用途改变后土壤微生物群落组成及生物量的改变

Title：
Alterations in soil microbial community composition and biomass following agricultural land use change

DOI：
10.1038/srep36587

Abstract：
The effect of agricultural land use change on soil microbial community composition and biomass remains a widely debated topic. Here, we investigated soil microbial community composition and biomass [e.g., bacteria (B), fungi (F), Arbuscular mycorrhizal fungi (AMF) and Actinomycete (ACT)] using phospholipid fatty acids (PLFAs) analysis, and basal microbial respiration in afforested, cropland and adjacent uncultivated soils in central China. We also investigated soil organic carbon and nitrogen (SOC and SON), labile carbon and nitrogen (LC and LN), recalcitrant carbon and nitrogen (RC and RN), pH, moisture, and temperature. Afforestation averaged higher microbial PLFA biomass compared with cropland and uncultivated soils with higher values in top soils than deep soils. The microbial PLFA biomass was strongly correlated with SON and LC. Higher SOC, SON, LC, LN, moisture and lower pH in afforested soils could be explained approximately 87.3% of total variation of higher total PLFAs. Afforestation also enhanced the F: B ratios compared with cropland. The basal microbial respiration was higher while the basal microbial respiration on a per-unit-PLFA basis was lower in afforested land than adjacent cropland and uncultivated land, suggesting afforestation may increase soil C utilization efficiency and decrease respiration loss in afforested soils.

All Authors：
QianZhang,JunjunWu,FanYang,Yao Lei,Quanfa Zhang,XiaoliCheng

First Authors：
Qian Zhang

Correspondence：
Xiaoli Cheng

内容要点：

1、研究农业用地用途改变后，土壤微生物（如细菌、真菌、丛枝菌根真菌及放线菌）的群落组成及生物量的变化；

2、并检测土壤有机碳、有机氮、活性有机碳、活性有机氮、固碳、固氮、pH、湿度及温度的变化；

3、与未耕种土地及耕地相比，植树造林后的土地的微生物磷脂脂肪酸生物量更高；

4、微生物磷脂脂肪酸生物量与有机氮及活性有机碳显著相关；

5、与耕地相比，植树造林增加了真菌：细菌的比值。