【摘要】 【目的】解析不同土地利用方式下库区周边土壤质量的时空变化，探讨典型库区小流域面源污染潜在风险。【方法】以浙江台州长潭水库小流域周边农田和经济林为研究对象，分析库区小流域不同水期土壤氮磷空间分布特征。【结果】经济林和农田SOC含量在枯水期下降。土地利用方式、水期和流域三者的交互作用对有机碳(SOC)、总氮(TN)、有效氮(AN)、总磷(TP)、有效磷(AP)、碳磷比(C/P)、氮磷比(N/P)均有显著影响。丰水期象岙溪经济林和农田“源”强风险指数较高，而枯水期较高“源”强风险指数的支流则为宁溪和桐外岙溪。【结论】土壤氮磷分布受到水期、流域、土地利用方式交互作用的强烈影响，库区支流周边土壤“源”强风险随水期变化而波动。特别是长潭水库小流域宁溪需加强阻控流域周边土壤的肥料输入。更多还原

【Abstract】 【Objective】Understanding temporal and spatial changes of soil nutrients and soil quality under different land use patterns was of great significance for assessing the non-point source risk of small watersheds within reservoir areas.【Method】The economic forests and farmland surrounding the Changtan Reservoir basin were focused. The contents of soil organic carbon(SOC), nitrogen and phosphorus in the wet season and dry season were determined and the changes of the spatial distribution of soil nitrogen and phosphorus of eight sub-basins were analyzed in order to provide experimental basis for soil quality and non-point source pollution risk assessment in small watersheds.【Result】SOC content in economic forest and farmland decreased during dry season. The interaction of land use mode, water period and location had significant effects on SOC, TN, AN, TP, AP, C/P and N/P. The strong risk index of “source” in Xiang’aoxi economic forest and farmland was higher and the “source” strong risk index of Ningxi and Tongwai’aoxi was higher in the dry season.【Conclusion】To sum up, the distribution of soil N and P is strongly influenced by the interaction of water period, watershed and land use mode. The risk of soil “source” intensity around the tributaries of the reservoir area fluctuates with the change of water period, among which Ningxi should be strengthened the control of soil fertilizer input around the watershed.更多还原