常规与有机农作条件下土壤-植物系统磷素平衡及利用

基金项目: 国家自然科学基金项目(39600086)资助

Balance and utilization of phosphorus in soil-plant system under conventional and organic farming condition

1.
College of Resources and Environment Sciences, China Agricultural University,Beijing 100094
2.
Research Center for Eco-environmental Sciences,China Academy of Sciences,Beijing 100085

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。
- 磷 /
- 农作方式 /
- 利用效率
Abstract: 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.
- P /
- Farming system /
- Utilization rate