摘要
不合理的人为活动是侵蚀产沙的主要原因之一。在江西省信丰县崇墩沟小流域内由于稀土矿产的无序开发,导致河流泥沙严重淤积。通过实测河流淤积泥沙断面,计算出在7 500 m长的河道共淤积泥沙30 193 t,考虑到输移比,整个流域内土壤流失量可达3 500 t/km2,平均侵蚀模数也高达1 150 t/(km2.a)以上,属于中等强度的土壤侵蚀。调查结果发现,河流中淤积的泥沙主要来源于稀土矿开发的尾矿流失;土壤流失量高到99 730 t/km2,年平均侵蚀模数为34 000 t/(km2.a)以上,属于极强度的水土流失。治理水土流失,须加强对稀土矿开发的管理,防止形成新的水土流失;将已废弃的稀土尾矿作为治理的重中之重,可有效地降低流域内土壤侵蚀的强度。
The unreasonable human activity is one of the key factors for soil erosion and sediment yield. Irrational developing of rare earth mine in Chongdonggou watershed, Xinfeng County, induced to serious sediment silting in the river channel, and the total silting sediment was 30 193 t in the 7 500 m river channel estimated by measuring the silting section. Based on the sediment delivery ratio, soil loss in the whole watershed was 3 500 t/km^2, and soil erosive radius was more than 1 150 t/（km^2 ·a）. Erosion degree in the watershed was of middle erosion density. Soil loss from the tailings of rare earth mine was the most serious sources for sediment in river, and the loss was 99 730 t/km^2 with annual erosion amount greater than 34 000 t/（km^2· a） as the severest loss type. Among all the soil and water loss controlling measurements, management of rare earth mine development should be intensified and controlling abandoned mine tailings should be as a key aspect.
出处
《水土保持通报》
CSCD
北大核心
2005年第6期53-54,58,共3页
Bulletin of Soil and Water Conservation
基金
国家林业局造林司生物措施防治水土流失项目资助
关键词
稀土矿开发
泥沙淤积量估算
红壤区
developing of rare earth mine
estimation of silting sediment
red earth region
