黄淮海平原农区县域土壤养分平衡评价方法及其应用

 人为因素控制下的农业土壤养分循环是建立可持续农业的物质基础,研究土地利用系统养分平衡可以达到两个目标:一是判断土壤肥力的变化趋势与速率;二是判断农业对环境的影响。通过两种方法,即土壤养分平衡宏观统计方法和GIS支持的土壤养分时空变化一体化评价方法,对曲周县近20年的土壤氮、磷、钾变化趋势和时空分布进行了评价。两种方法都表明,曲周县农业土壤氮、磷平衡有余,而钾含量逐步减少。并对比该县地下水硝态氮的含量,分析施肥对环境的影响,发现土壤全氮的含量的增加与地下水硝态氮和含量有一定的相关性。

Study on Evaluation Methods of Soil Nutrient Balance and Application at County Level in Huang-huai-hai Plain

Soil nutrient balance controlled by human factor is substance basis for sustainable agriculture, and two objectscan be achieved through study on soil nutrient balance: to judge the tendency and rate of change of soil fertility; to judge theinfluence of agriculture on the entire environment. This paper studied on the evaluation of soil nutrient changing tendency andspatial-temporal distribution at county level in recently 20 years, soil nutrient balance macro-statistic method and soil nutrientspatial-temporal change evaluation method were studied . Both of the two kinds of methods indicated that nitrogen and phosphorusin soil were superabundant, but potassium decreased year dy year. Some correlativity between the increased soil nitrogen andNO3- -N content of groundwater was also found.