| 宜兴茶园土壤侵蚀及生态影响 |
| |
| 引用本文： | 张燕,杨浩,金峰,张洪,彭补拙.宜兴茶园土壤侵蚀及生态影响[J].土壤学报,2003,40(6):815-821. |
| |
| 作者姓名： | 张燕 杨浩 金峰 张洪 彭补拙 |
| |
| 作者单位： | 1. 中国科学院南京土壤研究所,南京,210008
2. 南京大学城市与资源学系,南京,210093 |
| |
| 基金项目： | 国家自然科学基金重点项目(49831070)和国家自然科学基金项目(49973027)资助 |
| |
| 摘 要： | 茶园是苏南丘陵坡地的一种典型利用方式 ,其上发生的土壤侵蚀及产生的生态影响不容忽视。而要测度土壤侵蚀 ,137Cs示踪法是目前使用较多的一种有用工具 ,但要用此法 ,需找到研究区的137Cs背景值 ,并建立合适的估算模型。本文在对宜兴茶园研究时 ,确定了这里的137Cs背景值为 2 2 0 0Bqm- 2 ,并建立了估算耕作土壤的较合理的模型h =Hc× (Cref-Ct) /(Cref-Cin)。在此基础上衡量了研究对象的土壤侵蚀量 ;并进一步探讨了由此引发的生态影响 ,包括土层减薄、土壤质地改变和养分流失这样的直接影响 ,以及与之相应的一些间接影响 ,如能耗增加、水体富营养化及土地适宜性变化等 ;并且 ,还采用等值侵蚀模数这个指标 ,在与其他地区尤其是黄土和红壤区比较中揭示了苏南地区土壤侵蚀的生态危害的严重性
|
| 关 键 词： | 137Cs背景值 侵蚀模型 等值侵蚀模数 直接生态影响 间接生态影响 |
| 收稿时间： | 2002/5/26 0:00:00 |
| 修稿时间： | 2002年5月26日 |
SOIL EROSION AND ITS ECOLOGICAL IMPACTS IN YIXING TEA PLANTATION |
| |
| Zhang Yan,Yang Hao,Jin Feng,Zhang Hong and Peng Bu-zhuo.SOIL EROSION AND ITS ECOLOGICAL IMPACTS IN YIXING TEA PLANTATION[J].Acta Pedologica Sinica,2003,40(6):815-821. |
| |
| Authors: | Zhang Yan Yang Hao Jin Feng Zhang Hong and Peng Bu-zhuo |
| |
| Affiliation: | Zhang Yan 1 Yang Hao 1 Jin Feng 1 Zhang Hong 2 Peng Bu-zhuo 2 |
| |
| Abstract: | Planting tea is a typical way of land use of hillside fields in hilly regions of South Jiangsu Province.But the resultant soil erosion and its ecological impacts there should not be ignored.In order to measure soil erosion, the 137Cs tracer method is a useful tool at present.However it is necessary to find out the background value of 137Cs in the region and set up an applicable model for this method.After careful study the 137Cs background value of the study area is 2 200 Bq m-2 and a model for estimating erosion of cultivated soil is set up as h=Hc×(Cref-Ct)/(Cref-Cin).Based on the above work, the soil erosion rates are estimated and both direct and secondary ecological impacts of soil erosion are further discussed.The direct ecological impacts are thinning surface soil layers, deteriorating soil structure and decreasing soil nutrients.The secondary impacts include increase in fertilizer application and energy consumption, entrophication of waterbodies and change in landuse adaptability.In order to reveal seriousness of the damage of soil erosion to cultivated sloping fields in south Jiangsu Province by comparing with that in the Loess Plateau and red soil regions, an equivalent erosion module is put forward as index. |
| |
| Keywords: | Cs background value Erosion model Equivalent erosion module Direct ecological impact Secondary ecological impact |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《土壤学报》浏览原始摘要信息 |
|
点击此处可从《土壤学报》下载全文 |
|
