西藏'一江两河'农业生态系统养分结构分析及平衡研究

摘要

The input - output structure and balance status of nitrogen, phosphorus and potassium in “ One River and Two Streams” agro - ecosystem of Tibet including 18 counties were studied. The results showed that the soil nutrients in this area were in deficit state, and lacked 52.55 kg/hm2 nitrogen, 10.89 kg/hm2 phosphorus and 55.74 kg/hm2 potassium. In order to enhance the productivity of this agro -ecosystem,the application of organic fertilizer should be strengthened and the proportion of nitrogen, phosphorus and potassium fertilizers should be adjusted, especially the application rate of potassium should be enlarged.%对西藏"一江两河"流域18县市区农业生态系统氮、磷、钾三要素输入、输出结构及其平衡状况进行分析,结果表明:本区域养分处于亏缺状态,氮、磷、钾分别亏缺52.55、10.89、55.74 kg/hm2.为提高本区农业生态系统生产力,应重视有机肥的投入,调整施用化肥的氮、磷、钾比例,特别要加大钾肥的施用量.