Desertification sensitivity assessment in the Gonghe Basin

doi:10.7522/j.issn.1000-694X.2024.00078

Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (1): 1-9.DOI: 10.7522/j.issn.1000-694X.2024.00078

Desertification sensitivity assessment in the Gonghe Basin

Hong Jia(), Lianyou Liu, Jifu Liu()

Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education / MOE Engineering Research Center of Desertification and Blown-Sand Control / Faculty of Geographical Science，Beijing Normal University，Beijing 100875，China

Received:2024-05-13 Revised:2024-05-28 Online:2025-01-20 Published:2025-01-13
Contact: Jifu Liu

Abstract

Abstract:

The Gonghe Basin is located in a sensitive area of climate change on the Qinghai-Tibet Plateau， and is facing serious desertification threats due to extreme climate conditions and irrational human activities. In this study， we used MEDALUS model to evaluate the spatiotemporal variation characteristics of desertification sensitivity from 2000 to 2020 based on the climate quality index （CQI）， vegetation quality index （VQI）， soil quality index （SQI） and management quality index （MQI）， and then analyzed the driving mechanism of desertification sensitivity using Geodetector. The results showed：（1） The land desertification in the study area was mainly characterized by medium to high sensitivity， showing a spatial pattern of high sensitivity in the central region and low sensitivity in the surrounding areas. （2） From 2000 to 2020， the desertification sensitivity of the Gonghe Basin significantly decreased， and the land area with high and extremely high desertification sensitivity had markedly declined. （3） The influence of climate quality index and vegetation quality index on desertification sensitivity was higher than that of soil quality index and management quality index； the desertification sensitivity of Gonghe Basin was affected by both natural and human factors， and the interaction between vegetation quality index and management quality index was the dominant factor of desertification sensitivity.

Key words: desertification, MEDALUS, sensitivity assessment, Geodetector, Gonghe Basin

CLC Number:

P931.3

Hong Jia, Lianyou Liu, Jifu Liu. Desertification sensitivity assessment in the Gonghe Basin[J]. Journal of Desert Research, 2025, 45(1): 1-9.

Figures/Tables 12

References 30

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数据类型	年份	空间分辨率/m	来源
DEM	2020	30	地理空间数据云(http://www.gscloud.cn)
土壤质地、土壤有机质含量	2013	1 000	世界土壤数据库(HWSD V1.2, http://www.fao.org)
NDVI	2000—2020	250	MOD13Q1
植被类型	2001	1 000	中国科学院资源环境科学数据中心(https://www.resdc.cn)
土地利用分类	2000—2020	30	CLCD (https://doi.org/10.5194/essd-2021-7)
人口分布	2000—2020	1 000	World Pop (https://www.worldpop.org/)
气温、降水、风速	2000—2020	1 000	国家地球系统科学数据中心（https://www.geodata.cn/）

数据类型	年份	空间分辨率/m	来源
DEM	2020	30	地理空间数据云(http://www.gscloud.cn)
土壤质地、土壤有机质含量	2013	1 000	世界土壤数据库(HWSD V1.2, http://www.fao.org)
NDVI	2000—2020	250	MOD13Q1
植被类型	2001	1 000	中国科学院资源环境科学数据中心(https://www.resdc.cn)
土地利用分类	2000—2020	30	CLCD (https://doi.org/10.5194/essd-2021-7)
人口分布	2000—2020	1 000	World Pop (https://www.worldpop.org/)
气温、降水、风速	2000—2020	1 000	国家地球系统科学数据中心（https://www.geodata.cn/）

指标	分级	描述	权重
年平均气温	1	<-6 ℃	1.00
	2	-6~-2 ℃	1.33
	3	-2~2 ℃	1.67
	4	>2 ℃	2.00
年降水量	1	>500 mm	1.00
	2	410~500 mm	1.33
	3	320~410 mm	1.67
	4	<320 mm	2.00
年平均风速	1	<1.4 m·s^-1	1.00
	2	1.4~1.7 m·s^-1	1.33
	3	1.7~2 m·s^-1	1.67
	4	>2 m·s^-1	2.00

指标	分级	描述	权重
年平均气温	1	<-6 ℃	1.00
	2	-6~-2 ℃	1.33
	3	-2~2 ℃	1.67
	4	>2 ℃	2.00
年降水量	1	>500 mm	1.00
	2	410~500 mm	1.33
	3	320~410 mm	1.67
	4	<320 mm	2.00
年平均风速	1	<1.4 m·s^-1	1.00
	2	1.4~1.7 m·s^-1	1.33
	3	1.7~2 m·s^-1	1.67
	4	>2 m·s^-1	2.00

指标	分级	描述	权重
侵蚀防护	1	针叶林、高山植被、其他	1.00
	2	农田、草原、草甸	1.33
	3	灌丛	1.67
	4	荒漠	2.00
抗旱性	1	针叶林、其他	1.00
	2	农田、高山植被、灌丛	1.33
	3	草原、草甸	1.67
	4	荒漠	2.00
NDVI	1	>0.4	1.00
	2	0.3~0.4	1.25
	3	0.2~0.3	1.50
	4	0.1~0.2	1.75
	5	<0.1	2.00

Desertification sensitivity assessment in the Gonghe Basin

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指标	类别	描述	权重
土壤含砂量	1	<25%	1.00
	2	25%~40%	1.33
	3	40%~65%	1.67
	4	>65%	2.00
地形坡度	1	<5°	1.00
	2	5°~15°	1.33
	3	15°~30°	1.67
	4	>30°	2.00
土壤有机质含量	1	>3%	1.00
	2	2%~3%	1.33
	3	1%~2%	1.67
	4	<1%	2.00

指标	分级	描述	权重
人口密度	1	<2 人·km^-2	1.00
	2	2~5 人·km^-2	1.20
	3	5~10 人·km^-2	1.40
	4	10~20 人·km^-2	1.60
	5	20~40 人·km^-2	1.80
	6	>40 人·km^-2	2.00
土地利用强度	1	林地、灌木、湿地、裸地	1.00
	2	草地、水体	1.50
	3	建设用地、农田	2.00

年份	荒漠化敏感性分级
年份	低	中等	高	极高
2000	2 721.19	5 362.16	6 678.57	5 051.77
2010	4 422.06	7 507.64	4 537.99	3 342.58
2020	3 267.63	7 042.89	5 270.27	4 400.32

荒漠化敏感性指数	2000年	2010年	2020年
气候质量指数	0.363	0.397	0.393
植被质量指数	0.398	0.320	0.321
土壤质量指数	0.293	0.303	0.290
管理质量指数	0.232	0.221	0.218

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