摘要
通过定位观测资料的分析，发现陕北多沙粗沙区乡村聚落的平均年侵蚀强度达5434．3t／km^2，户间道路、户间空地、庭院的平均侵蚀强度分别达7348t／km^2，6873．2t／km^2，2081．7t／km^2。除庭院属轻度级侵蚀外，其它已达强度级侵蚀。同时延安的户间道路（14190．8t／km^2），榆林的户间空地（13547．4t／km^2），已达极强度侵蚀。应加强研究和防治。水蚀泥沙的粒度以0．01～0．05mm的粗粉沙和0．001～0．005mm的粘粒为主，分别占到43．98％和19．81％，≥0．05mm的粗泥沙含量明显小于聚落以外的坡面，而且区域变化比较明显，从南到北，细粒成分愈来愈少，粗粒成分越来越多；与土壤粒度相比，粗泥沙水蚀系数在庭院、户间道路、户间空地分别达到0．54，0．55，0．75，平均为0．61。
On the basis of field-spot observation, it is found that the average annual erosion intensity of rural settlements in the much and coarse sediment area of north Shaanxi is 5 434.3 t/km^2. The average annual erosion intensity in roads, open space and yards is 7 324 t/km^2, 6 873.2 t/km^2 and 2081.7 t/km^2 separately, reaching the very serous level of erosion except yard erosion. And the annual erosion intensity of Yan＇ an road and Yulin open space is up to 14190.8 and 13547.4t/km^2, reaching the extremely serious level. It is urgent for study and prevention. Sediment granularity of water erosion is in the major of semi-coarse sediment （0.01-0.05 mm） and clay sediment （0.001 -0.05 mm） , occupying 43.98% and 19.81% individually. The coarse sediment （grain size ≥0.05 mm） is smaller obviously than that of slope outside the settlements and becomes thin from north to south. The water erosion coefficient of coarse sediment from loess in yards, roads and open space is 0.54, 0.55 and 0.75 individually, with the average 0.61.
出处
《地域研究与开发》
CSSCI
北大核心
2008年第3期88-93,共6页
Areal Research and Development
基金
国家自然科学基金资助项目(50279019)
关键词
乡村聚落
水蚀
泥沙
多沙粗沙区
陕北
rural settlements
water erosion
sediment
sandy grit
northern Shaanxi
