[Soil enzyme activities in a Pleioblastus amurus plantation in Rainy Area of West China under simulated nitrogen deposition].
From November 2007 to May 2009, a simulation test was conducted in a Pleioblastus amarus plantation in Rainy Area of West China to study the effects of nitrogen deposition on the activities of soil enzymes. Four treatments were installed, i.e., control (0 g N x m(-2) x a(-1)), low nitrogen (5 g N x m(-2) x a(-1)), medium nitrogen (15 g N x m(-2) x a(-1)), and high nitrogen (30 g N x m(-2) x a(-1)). Half year after N deposition, 0-20 cm soil samples were collected monthly, and the activities of peroxidase, polyphenol oxidase, cellulase, sucrase, urease, and acid phosphatase were determined. All test enzyme activities had apparent, seasonal variation, with the peak of cellulase, suerase, and acid phosphatase activities in spring, of urease activity in autumn, and of peroxidase and polyphenol oxidase activities in winter. Nitrogen deposition stimulated the activities of polyphenol oxidase, sucrase, urease, and acid phosphatase, inhibited cellulase activity, but had no significant effects on peroxidase activity. The test P. amurus plantation ecosystem was N-limited, and nitrogen deposition stimulated the decomposition of soil organic matter by microbe-enzyme system.
Tu
Li-hua
LH
Sichuan Province Key Laboratory of Ecological Engineering, College of Forestry, Sichuan Agricultural University, Ya' an 625014, Sichuan, China. iamtlh@163.com
Hu
Ting-xing
TX
Zhang
Jian
J
Li
Ren-hong
RH
Dai
Hong-zhong
HZ
Luo
Shou-hua
SH
Xiang
Yuan-bin
YB
Huang
Li-hua
LH
D002480:Cellulase / Q000378:metabolism; D002681:China; D003198:Computer Simulation; D017753:Ecosystem; D008962:Models, Theoretical; D009584:Nitrogen / Q000032:analysis*; D009195:Peroxidase / Q000378:metabolism*; D006109:Poaceae / Q000254:growth & development*; D011891:Rain; D012987:Soil / Q000032:analysis*; D014510:Urease / Q000378:metabolism*
D012987:Soil; D009195:Peroxidase; D002480:Cellulase; D014510:Urease; D009584:Nitrogen