西藏“一江两河”农业生态系统养分结构分析及平衡研究

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52.551、0.89、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。

Study on Nutrient Structure and Balance of One River and Two Streams Agro-ecosystem in Tibet

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 fe...