Fatty‐Acid Profiles and Enzyme Activities in Soil Particle‐Size Fractions under Long‐Term Fertilization

• DOI: 10.2136/sssaj2015.07.0255
• Publication Date: 2016-02-25T16:57:23Z
• Authors: Qian Zhang; Guoqing Liang; Wei Zhou; Jingwen Sun; Xiubin Wang; Ping He
• Keywords: Soil carbon

Core Ideas Organic treatments significantly enhanced soil organic C, total N, and most enzymes activities. The highest enzyme activities were existed in 200‐ to 63‐μm fraction. Soil C/N ratio, α‐glucosidase, sulfatase, β‐glucosidase, β‐cellobiohydrolase, phenol oxidase correlated with phospholipid fatty acids. A long‐term experiment was established 1981 examine the influence of mineral fertilizer on carbon (SOC), nitrogen (TN), activities, microbial community composition. In this study, we considered 33 yr following treatments: no (control, CK), N (N), P (NP), K (NPK), manure plus (NPKM), (M). We focused yellow‐brown paddy its particle‐size fractions >2000 µm (large macroaggregate sized), 2000–200 (coarse sand 200–63 (fine 63–2 (silt 2–0.1 (clay sized). Nutrient concentrations enzymes, affected by treatment particle fraction, unevenly active throughout soils which showed concentration activity fine except sulfatase (Sul). However, coarse fraction contributed largest SOC, TN, pools bulk soil, followed silt‐sized large macroaggregate‐sized fractions. Compared NPK, NPKM, M improved phosphatase (Pho), β‐glucosidase (βG), β‐cellobiohydrolase (βCB), N‐acetyl‐glucosaminidase (NAG), β‐xylosidase (βX), (PhOx), peroxidase acids (PLFAs) abundance Manure also accelerated accumulation at expense clay Principal component analysis (PCA) composition a smaller variability than suggested considerable effect nutrient availability Redundancy (RDA) convinced α‐glucosidase (αG), Sul, βG, βCB, PhOx governed study. Our results conveyed application fertilizers increase fractions, along abundant diverse other treated