【摘 要】
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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 po
【机 构】
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Research Institute of Subtropical Forestry,Chinese Academy of Forestry,Fuyang County,Zhejiang Provin
论文部分内容阅读
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.
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