北部湾钦江流域土壤侵蚀及其硒元素流失评估

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Abstract

Based on the meteorological data, remote sensing data, digital elevation model, soil types and soil texture data of Qinjiang River basin in 2015, the spatial distribution of soil erosion and associated Se loss in 2015 in Qinjiang River Basin in Beibu Gulf coastal zone, was quantitatively analyzed by using the modified universal soil loss equation (RUSLE) and GIS spatial analysis technology technique. The results indicated that the total amount of soil erosion in Beibu Gulf Qinjiang River Basin in 2015 was 381.64×104t/a, and the average modulus of soil erosion was 14.79t/(hm²·a). The soil erosion modulus of the Qinjiang River Basin was less than that of the 2010, but far greater than that of the Ministry of water resources in the red soil hilly area of the South China. The soil erosion intensity was mainly slight erosion, which decreased successively from upstream to downstream in the basin. The elevation zone between 0~240m and the slope zone belts of greater than 15degrees were the key areas for soil erosion prevention in the future. The highest modulus of soil erosion in mountainous area was 23.49t/(hm²·a), which was about 1.59times higher than the average modulus of soil erosion in watershed, followed by hilly area and the smallest in alluvial plain. The content of selenium in the soil was between 0.38~0.72mg/kg, with the average value of 0.49mg/kg, which was 1.69times higher than the background value of selenium in Chinese. Selenium content in different land use types decreased with the increase of soil profile depth. The order of Se content in different land use types was forest land > garden land > grassland > paddy field > dry land, and the order of Se content in different soil types was:new accumulated soil > limestone soil > gleying paddy soil > flooded paddy soil > dry land. Lateritic red soil > paddy soil soil > lateritic soil > coastal sandy soil > purple soil > salty acid paddy soil. The total loss of selenium Qinjiang River Basin was 8987.05kg/a. The average loss modulus was 0.0344kg/(hm²·a), and the loss of selenium in the middle reaches of the river basin was the largest. The results can provide scientific basis for the development of selenium-rich agricultural products, the development of selenium-rich agriculture and the promotion of land use value in Qinjiang River Basin.

Key words： soil erosion RUSLE Se loss the technology of RS and GIS Qinjiang River Basin in Beibu Gulf coastal zone

Received: 14 June 2018

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X144

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	TIAN Yi-chao
	HUANG Yuan-lin
	ZHANG Qiang
	TAO Jin
	ZHANG Ya-li
	XIE Xiao-kui
	WANG Ri-ming

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TIAN Yi-chao,HUANG Yuan-lin,ZHANG Qiang等. Soil erosion and Selenium loss in Qinjiang River Basin in Beibu Gulf coastal zone[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(1): 257-273.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I1/257

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