Pilot Study of Regional Ecological Carrying Capacity Based on P-S-R Model: A Case Study of Diebu County of Gansu Province

doi:10.11924/j.issn.1000-6850.casb20190500177

Abstract

Abstract:

The study aims to assess ecological carrying capacity and provide a theoretical support of regional sustainable development. Taking the Diebu County of Gansu Province as an example, firstly, the pressure-state-response (P-S-R) concept model was used to construct the index system of ecological carrying capacity, the index weight was defined according the analytic hierarchy process (AHP), to evaluate regional ecological carrying capacity; secondly, the water conservation function and biodiversity function were evaluated at the level of ecological function; finally, the causes of ecological carrying capacity were analyzed. The results showed that: (1) the overall ecological carrying capacity score of Diebu County was 0.239, which was in a strong carrying capacity state, the score of ecological resilience, resources and environmental capacity and human social influence which constituted the overall ecological carrying capacity was respectively 0.222, 0.062 and 0.063; (2) the water conservation capacity per unit area was 111.76 mm and the water conservation function was “high”, and the areas with high water conservation were mainly concentrated in the areas with mixed broadleaf-conifer forest and grassland; (3) the natural habitat accounted for 83.67% of the county’s total area, and the natural habitant quality index was “high”; (4) based on the analysis of natural and economic factors, it was found that the ecological environment of Diebu County was relatively good, but the area of forest and grass was decreasing gradually. Therefore, it is necessary to develop cultural tourism through rational guidance to promote the sustainable development of Diebu County.

Key words: ecological carrying capacity, water conservation, biological diversity, alpine region, Diebu County

CLC Number:

F205
X24

Li Zhen, Li Zhenlin, Qu Peng. Pilot Study of Regional Ecological Carrying Capacity Based on P-S-R Model: A Case Study of Diebu County of Gansu Province[J]. Chinese Agricultural Science Bulletin, 2020, 36(19): 85-92.

Figures/Tables 10

References 26

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一级生态系统类型	二级生态系统类型	平均径流系数/%
森林	常绿阔叶林	2.67
	常绿针叶林	3.02
	针阔混交林	2.29
	落叶阔叶林	1.33
	落叶针叶林	0.88
	稀疏林	19.20
灌丛	常绿阔叶灌丛	4.26
	落叶阔叶灌丛	4.17
	针叶灌丛	4.17
	稀疏灌丛	19.20
草地	草甸	8.20
	草原	4.78
	草丛	9.37
	稀疏草地	18.27
湿地	湿地	0.00

一级生态系统类型	二级生态系统类型	平均径流系数/%
森林	常绿阔叶林	2.67
	常绿针叶林	3.02
	针阔混交林	2.29
	落叶阔叶林	1.33
	落叶针叶林	0.88
	稀疏林	19.20
灌丛	常绿阔叶灌丛	4.26
	落叶阔叶灌丛	4.17
	针叶灌丛	4.17
	稀疏灌丛	19.20
草地	草甸	8.20
	草原	4.78
	草丛	9.37
	稀疏草地	18.27
湿地	湿地	0.00

类型	面积/hm²	比例/%
森林	273074.58	53.46
草地	151533.34	29.67
湿地	2780.64	0.54
合计	427388.56	83.67

类型	面积/hm²	比例/%
森林	273074.58	53.46
草地	151533.34	29.67
湿地	2780.64	0.54
合计	427388.56	83.67

准则层	指标层	统计数据	指标权重	得分
生态弹性力	年均降水量	473.10 mm	0.046	-0.021
	年均气温	8.60℃	0.026	-0.012
	森林覆盖率	65.85%	0.152	-0.068
	草原覆盖率	29.67%	0.108	-0.048
	水资源总量	1.59×10⁹ m³	0.207	0.371
资源与环境承载力	人均耕地面积	956.47 m²/人	0.017	-0.016
	人均水资源量	29664.18 m³/人	0.063	0.018
	人均公共绿地面积	6.20 m²/人	0.010	-0.009
	人均草地	28271.14 m²/人	0.029	0.007
	人均林地面积	56100.75 m²/人	0.044	0.063
人类社会影响力	人均粮食产量	0.21 t/人	0.035	-0.023
	人口承载力	10.49人/km²	0.008	0.000
	城镇化率	29.50%	0.013	0.017
	恩格尔系数	42.00%	0.077	0.161
	节能环保支出	5.59百万元	0.022	-0.007
	人均GDP	2.12万元/人	0.039	-0.020
	万元GDP能耗	0.30 t标准煤/万元	0.057	-0.036
	化学需氧量	0.09万t	0.022	-0.015
	二氧化硫	0.03万t	0.022	-0.015