摘要
分析了自然生态系统中P的形态、数量和循环方式,对常规和有机农作条件下土壤-植物系统P的来源、数量、输入、输出途径及特点进行了比较,并探讨了P的利用效率及影响因素。研究表明,有机农作方式下P投入水平低,输出与常规农作方式相当,系统表现为负平衡,但P的利用效率高于常规农作方式,对减少P素的负效应具有重要的环境意义。
The P forms,quantity and cycle approaches in natural ecosystem are summarized, and its sources, quantity, input and output approaches under conventional and organic farming condition are compared. Utilization efficiency of P and influencing factors are also analyzed. The research indicates that in organic farming system,there exists negative P balance because the input of P is lower and the output of P is nearly the same as conventional farming system, but the using efficiency of P is higher than that of conventional farming system. This makes a great significance for the positive environmental effect of P.
出处
《中国生态农业学报》
CAS
CSCD
2001年第2期64-66,共3页
Chinese Journal of Eco-Agriculture
基金
国家自然科学基金(39600086)
