Effects of mulching management on soil and foliar C, N and P stoichiometry in bamboo (Phyllostachys violascens)
Mulching with rice straw and chaff in bamboo (Phyllostachys violascens) plantations for early shooting and high profit resulted in stand degradation in Zhejiang,China.The present study explored the possible mechanisms of degradation by analysing the effects of intensive mulching on soil and foliar carbon (C),nitrogen (N),phosphorous (P) stoichiometry in bamboo plantations.Results showed that mulching for 3 and 6 years increased soil C,N,P and the ratios of C∶P and N∶P but decreased soil pH.Mulching decreased foliar C,N and P while increasing the C∶N,C∶P and N∶P ratios.Foliar N∶P ratio had significant positive correlation with soil P and pH and significant negative correlation with soil N∶P and C:P ratios.It appeared that changes in soil C,N and P stoichiometry caused by long-term mulching management resulted in (1) enhanced function of P as the limiting factor and (2) soil acidification.Therefore,bamboo stand degradation caused by mulching management may be ascribed to imbalance in the relationship between C,N and P,inhibited absorption of N and P by roots as well as decreased foliar C assimilation capacity.
Stand degradation p limitation soil acidification nutrient imbalance
GUO Ziwu Chen Shuanglin YANG Qingping LI Yingchun ZHUANG Minghao
Research Institute of Subtropical Forestry,Chinese Academy of Forestry,Fuyang County,Zhejiang Province,311400 PR China
国内会议
浙江丽水
英文
392-400
2014-10-28(万方平台首次上网日期,不代表论文的发表时间)