县域尺度水土流失重点治理区域划定方法

doi:10.16843/j.sswc.2018.06.008

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Abstract [Background] Forty national key prevention and control regions for soil and water loss were divided in China according to National Plan on Soil and Water Conservation (2015-2030), involving 1091 counties, with a total county area of 49.805×10⁸ km²,which was approved by the State Council of the People's Republic of China in 2015. The key control area is 4.944×10⁸ km², but its specific scope has not been defined up to now. Due to this, key regionalization of prevention and control of soil erosion and water loss are affected on provincial and county levels. Thus studying a dividing method of key control area at the county scale for national key prevention and control region is necessary.[Methods] We used ArcGIS to study the dividing method of the key control area in Pingshan county, Hebei province. Before the research, we collected the results of national key regionalization of prevention and control of soil erosion and water loss, township-level divisions of Pingshan county, land use, vegetation coverage and soil erosion. Next, we selected the quantitative and qualitative indexes for analysis. At last, We divided the key control area in Pingshan county by the unit of township district and small watershed partly, and discussed contrastively between the results of study and the reference value of Pingshan county which had been rechecked and provided in National Plan on Soil and Water Conservation (2015-2030).[Results] According to quantitative index, the divided key control area based on the unit of township district was 1 358.81 km², and the divided key control area based on the unit of small watershed was 1 273.61 km². The results were all greater than the reference value. And area ratio of sloping land had no reference significance. Instead, the result (1 126.44 km²) was close to the reference value (1 106.80 km²) and reasonably distributed, the quantitative and qualitative indexes were considered comprehensively and were superimposed over the unit of township district and small watershed.[Conclusions] The division of the national key control area of soil and water loss is an important basic work. Firstly, the comprehensive, scientific and operable index system should be constructed. Secondly, the relatively suitable division unit should be selected, which follows the principle demand such as relative centralization. Thirdly, priority should be given to dividing key control area of soil and water loss at the national level, and the division of key control area at the provincial level and below should be carried out under its guidance. Fourthly, the national key control area should be adjusted and managed regularly through dynamic monitoring of soil and water loss.

Key words： water and soil loss key prevention and control region key control area county scale dividing method

Received: 19 March 2018

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	LI Zixuan
	ZOU Haitian
	ZHAO Hui
	QI Jianhuai

Cite this article:

LI Zixuan,ZOU Haitian,ZHAO Hui, et al. An approach of dividing key control area for soil and water loss at the county scale[J]. SSWC, 2018, 16(6): 56-63.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2018.06.008 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2018/V16/I6/56

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