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引用本文:曹慧,杨浩,赵其国.太湖丘陵地区典型坡面土壤侵蚀与养分流失.湖泊科学,2002,14(3):242-246. DOI:10.18307/2002.0308
CAO Hui,YANG Hao,ZHAO Qiguo.Soil Erosion and Nutrients Loss on the Typical Slope in Hilly Region of Taihu Basin. J. Lake Sci.2002,14(3):242-246. DOI:10.18307/2002.0308
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太湖丘陵地区典型坡面土壤侵蚀与养分流失
曹慧, 杨浩, 赵其国
中国科学院南京土壤研究所, 南京210008
摘要:
建立了基于137Cs技术的土壤侵蚀的定量模型,采用有关土壤养分流失方程,对太湖地区典型坡面的土壤侵蚀和土壤养分流失进行初步估算.结果表明,研究地区的典型坡面存在着一定的土壤侵蚀,林地各个剖面点的土壤侵蚀模数平均为 1313.6t/(km2·a),而菜地所在的微地貌部位土壤侵蚀更达 5185.68t/(km2·a).土壤侵蚀主要受植被覆盖和人为耕作的影响,侵蚀量的大小排序为坡麓菜地 >坡中马尾松林地 >竹林地>坡顶马尾松林地.选择的典型坡面存在着一定的土壤养分流失,林地有机质、全氮、全磷与全钾的平均流失量亦分别高达 28.29,1.38,0.35和 16.76t/(km2·a),养分流失量大的地貌部位的土壤有机质、全氮、全磷和全钾含量低,而土壤侵蚀微弱的坡顶林地土壤养分含量较高.菜地土壤养分流失量最大,但由于施肥作用,土壤养分含最高.太湖丘陵地区的土壤侵蚀与养分流失不仅关系到本地区土壤肥力的退化,并对太湖水体环境质量的产生影响.
关键词:  太湖地区  137Cs  土壤侵蚀  养分流失
DOI:10.18307/2002.0308
分类号:
基金项目:国家自然科学基金重点项目(49831070);国家自然科学基金项目(49973027)联合资助
Soil Erosion and Nutrients Loss on the Typical Slope in Hilly Region of Taihu Basin
CAO Hui, YANG Hao, ZHAO Qiguo
Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, P.R.China
Abstract:
Based on 137Cs technique, a quantitative model for soil erosion has been established, and the amountof soil erosion and nutrients losses have been calculated.The resul ts showed that the average amountof soil erosion of various profiles in forestis 1313.6 t/(km2·a), and the erosion in vegetable land is much hig her, so there is soil erosion in hilly region of Taihu Basin.The main factors affecting soil erosion are vegetable cover and cultivation, and the sortorder of soil erosion amounton different landforms from high to lowis as follows:vegetable land >middle slopping hill with masonpine >middle slopping upland with bamboo >top land.The nutrients loss is correlative with soil erosion, and the average loss for organic matter, total nitrogen, total phosphorus and total potassium in forestis 28.29, 1.38, 0.35 and 16.76 t/(km2·a), respectively.Therefore, it's time to pay attention to soil erosion in this area, and take some measures toreduce its effecton soil fertilizer and water quality in Taihu Basin.
Key words:  Taihu Basin  137Cs  soil erosion  soil nutrients losses
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