王家沟流域农田养分循环及改善途径

本文根据王家沟流域内1986～1988年三类农田的养分收支情况,计算了农业生产过程中的养分输入和输出,从而为建立高效的农田生态系统提供了科学依据。通过对农田养分概算看出,坡耕地的养分流失量占到农田养分总输出量的59.5％～76.2％。改善农田养分循环的途径是建设基本农田、增施有机肥料和调整种植结构等。

Way of Farmland Nutrient Circulation and Improvement of Wangjiagou Watershed

The paper calculates the input and output of nutrient during the process of agricultural production, based on the nutrient circulation of farmland on slopes, terraced fields and dam land in Wangjiagou basin on the east of Beichuan River of Sanchuan River basin in west Shanxi in the period of 1986-1988. The calculation provides scientific basis for building an ecosystem of farmland with high benefits. It can be seen from the calculation that the loss of nutrient of sloping farmlands occupies 59. 5%-76. 2% of the total nutrient output of farmlands. Therefore, the way of improving nutrient circulation is to build farmland with high productivity, apply more organic fertilizer and readjust the structure of plant.