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养分贮备和累积量(正流量戏去负流量)是可持续性的定量化指标,在本文中用于对农业生态系统进行分类。早期的研究结果表明,由于养分低贮备和负累积,非洲撒哈拉沙漠以南地区(SSA)的大部分农业生态系统都可被划入不可持续之列。为在非洲撒哈拉沙漠以南地区提高农业产量,并建立可持续农业生态系统,应采用“综合养分管理”(INM)技术体系,从而减少养分流失,并向系统中补充新的养分供给。综合养分管理技术的应用程度取决于国家和农场这两个层次上各种社会经济因素的相互作用。文中综述了目前我们在综合养分管理技术的研究应用方面所掌握的知识及存在的不足,并针对这些不足提出了一项综合养分管理研究议程。
Nutrient reserves and cumulants (positive flows minus flux) are quantitative indicators of sustainability that are used in this paper to classify agro-ecosystems. Earlier findings suggest that most of the agro-ecosystems in sub-Saharan Africa (SSA) can be classified as unsustainable due to low stocks and negative accumulation of nutrients. To increase agricultural production in sub-Saharan Africa and establish sustainable agroecosystems, the Integrated Nutrient Management (INM) technology system should be adopted to reduce nutrient loss and to replenish new nutrient supply to the system. The application of integrated nutrient management techniques depends on the interaction of various socio-economic factors at the two levels of the state and the farm. In this paper, the current knowledge and problems we have encountered in the research and application of integrated nutrient management techniques are reviewed. An integrated research agenda of nutrient management is proposed according to these deficiencies.