期刊
PEDOSPHERE
卷 22, 期 2, 页码 263-272出版社
SCIENCE PRESS
DOI: 10.1016/S1002-0160(12)60013-7
关键词
drying-wetting cycles; microbial activity; microbial biomass; microbial substrate utilization; phospholipid fatty acid
类别
资金
- State Key Laboratory of Soil and Sustainable Agriculture, China
- National Basic Research Program (973 Program) of China [2007CB109305]
- National Natural Science Foundation of China [30971859, 30370840]
- International Plant Nutrition Institute (IPNI), USA
Soil drying and wetting impose significant influences on soil nitrogen (N) dynamics and microbial communities. However, effects of drying-wetting cycles, while common in vegetable soils; especially under greenhouse conditions, have not been well studied. In this study, two greenhouse vegetable soils, which were collected from Xinji (XJ) and Hangzhou (HZ), China, were maintained at 30% and 75% water-holding capacity (WHC), or five cycles of 75% WHC followed by a 7-day dry-down to 30% WHC (DW). Soil inorganic N content increased during incubation. Net N mineralization (N min), microbial activity, and microbial biomass were significantly higher in the IDW treatment than in the 30% and 75% WHC treatments. The higher water content (75% WHC) treatment had higher N min, microbial activity, and microbial biomass than the lower water content treatment (30% WHC). Multivariate analyses of community-level physiological profile (CLPP) and phospholipid fatty acid (PLFA) data indicated that soil moisture regime had a significant effect on soil microbial community substrate utilization pattern and microbial community composition. The significant positive correlation between N min and microbial substrate utilization or PLFAs suggested that soil N mineralization had a close relationship with microbial community.
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