文献类型：期刊文献

中文题名：太湖流域安吉县林地养分流失评估

英文题名：Assessment on Soil Nutrients Loss of Forestland in Anji County of the Taihu Basin

作者：董敦义[1] 张彪[2] 张灿强[2] 杨艳刚[2] 潘春霞[1] 王斌[3]

第一作者：董敦义

机构：[1]浙江省安吉县林业局;[2]中国科学院地理科学与资源研究所;[3]中国林业科学研究院亚热带林业研究所

年份：2011

卷号：33

期号：8

起止页码：1608-1612

中文期刊名：资源科学

外文期刊名：Resources Science

收录：CSTPCD;;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；CSSCI:【CSSCI2010_2011】；

基金：国家水体污染控制与治理科技重大专项课题:"太湖流域水生态功能分区与质量目标管理技术示范"(编号:2008ZX07526-007)

语种：中文

中文关键词：林地;土壤侵蚀;养分流失;太湖流域;安吉县

外文关键词：Forest land; Soil erosion; Nutrient loss; Taihu Lake Basin; Anji County

分类号：S157.1

摘要：土壤侵蚀造成的营养物质迁移是太湖流域水环境质量下降的主要原因之一。为了全面认识太湖流域上游地区土壤侵蚀对流域水环境的威胁,为当地的林地经营部门的管理提供参考意见,本研究基于2007年的安吉县森林二类调查数据,采用土壤侵蚀模数与养分含量系数法,评估了安吉县林地土壤侵蚀量以及TN、TP、TK和有机质等4种养分流失量。结果表明:安吉县林地年土壤侵蚀量75.13万t,约合558.87t(/km2·a);因土壤侵蚀每年约有657t全氮、272.95t全磷、7858t全钾和1.51万t有机质的养分流失;从林地类型来看,竹林和经济林是林地土壤侵蚀及养分流失的主体(累计贡献率77%);而从地貌类型特征来看,90%的土壤侵蚀及养分流失来自丘陵和低山林地,76%的土壤侵蚀及养分流失来自斜坡和陡坡上的林地。
The nutrient input coming from soil erosion has a significant impact on water body eutrophication of the Taihu Lake Basin. There are a large number of studies discussing the soil erosion features of regional ecosystems based on field investigations, but few studies explored the risks of soil erosion and nutrient loss from forestland at the ecological landscape level. Anji County is located in the headwater streams of the Taihu Lake, whose plentiful forestlands are undergoing an unprecedented disturbance, such as building road, drainage, fertilization, site preparation, and other activities. Therefore, it is very important to examine the soil erosion patterns and nutrient loss in different forestlands, and provide reference for sustainable forest management and land use policy in the great lake area. Based on forest inventory data of Category Ⅱ in Anji County in 2007, this study estimated soil erosion and nutrients loss, including TN, TP, TK, and organic matter of the forestland, by means of the regional erosion modulus method, and estimated soil-nutrient contents. Result show that a volume of soil erosion in Anji County forestland was 751,300 tons per year, and was 5.58 tons per hectare. The loss for TN, TP, TK, and organic matter was 657 t, 272.95 t, 7858 t, and 15,100 t, respectively. Furthermore, the bamboo forest and commercial forest contributed 77% of the soil erosion and nutrients loss. Soil erosion and nutrients loss in coniferous forest and broadleaf forest accounted for about 79.8%. Shrub forest and mixed forest had few soil and nutrients loss. In addition, 90% of soil erosion and nutrients loss came from forestlands located on the hilly area and low mountain, which is likely due the forest distribution. Different slopes showed varying effects on soil erosion and nutrients loss. Forests located in the oblique slope and steep slope were responsible for 76% of the soil erosion and nutrients loss. The contribution of soil erosion and nutrients loss in various slopes was ranked in a descending order as： oblique slope〉steep slope〉slight slope〉flat slope〉acute slope〉dangerous slope. This paper discusses soil nutrient loss threats from forestland in the upper reaches of the Taihu Lake, and would be helpful for water pollution control and forest ecosystem management in the Taihu watershed.