Distribution of soil nutrients, extracellular enzyme activities and microbial communities across particle-size fractions in a long-term fertilizer experiment

文献类型： 外文期刊

第一作者： Zhang, Qian

作者： Zhang, Qian;Zhou, Wei;Liang, Guoqing;Sun, Jingwen;Wang, Xiubin;He, Ping

作者机构：

关键词： Long-term experiment;Fertilization;Particle-size fraction;Soil enzyme activities;PLFA;Microbial community

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.046； 五年影响因子：4.884 ）

ISSN：

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收录情况： SCI

摘要： Soils were particle-size fractionated to evaluate changes in carbon and nitrogen contents, enzyme activities and microbial community composition in response to 33 years of fertilization. This study focused on yellow-brown paddy soil and the particle-size fractions of >2000, 2000-200, 200-63, 63-2 and 2-0.1 mu m. Microplate fluorometric assays and phospholipid fatty acid analysis (PLFA) were used to determine soil biological characteristics under no fertilizer (control, CK), fertilizer N (N), fertilizer N and P (NP), fertilizer N, P and K (NPK), organic manure plus fertilizer N, P and K (NPKM) and organic manure (M) treatments. The results showed that fertilizer and soil fraction individually and interactively (P < 0.05) affected soil C, N contents, enzyme activities and microbial communities except for alpha-glucosidase activity, bacterial relative abundance and the G+: G-ratio. Particularly, organic treatments significantly increased soil organic carbon (SOC) and total nitrogen (N) contents of all five fractions. The highest C and N contents and enzyme activities were observed in the 200-63 mu m fraction, except for phosphatase and sulfatase, which showed the highest activities in the 2-0.1 mu m fraction. The highest activities of beta-glucosidase, beta-cellobiosidase, alpha-glucosidase, aminopeptidase, phenol oxidase and peroxidase in each fraction were obtained in the organic treatments (NPKM and M). Activities of phosphatase, sulfatase, N-acetyl-glucosaminidase and beta-xylosidase in the 2000-200 mu m fraction were highest under NPK treatment. PLFA analysis showed that the > 63 mu m fraction contained higher abundance of total PLFAs than that in the 63-0.1 mu m fraction. Organic treatments significantly enhanced total PLFAs abundance in > 2000 mu m fraction, but decreased PLFAs abundance in the 2000-200 mu m fraction compared with the NPK treatment. Larger fractions (> 2000 mu m and 2000-200 mu m) held relatively lower G+: G-ratios and higher fungi: bacteria ratios, which indicated better soil conditions in these fractions. Principal component analysis showed a smaller variability of microbial community composition among treatments than particle-size fractions. Most treatments of larger fractions (> 2000 mu m and 2000-2 mu m) were well separated from the other fractions. Redundancy analysis showed total N, C: N ratio, phosphatase, sulfatase, N-acetyl-glucosaminidase and beta-cellobiosidase activities significantly affected the composition of the microbial community. Significant correlations were also obtained between enzyme activities with SOC, total N and C: N ratio. We concluded that the long-term application of organic fertilizers contributed to improvements in the soil organic carbon and total nitrogen and most of the enzyme activities, especially for the 200-63 mu m fraction, along with abundant and diverse microbial community composition in larger particles. (C) 2015 Elsevier B.V. All rights reserved.

分类号： S154.1

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