Spatio-temporal evolution and driving forces of ecological quality in Qilian Mountains

doi:10.7522/j.issn.1000-694X.2024.00073

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (6): 258-267.DOI: 10.7522/j.issn.1000-694X.2024.00073

Spatio-temporal evolution and driving forces of ecological quality in Qilian Mountains

Bingbing Chen¹^,²^,³(), Yingchun Ge²(), Zhonghang Song¹^,³, Xiangnan Wu¹, Yu Ai¹^,³, Ying Yang⁴, Shengtang Wang², Yushuo Liu⁵

^1.Space Star Technology Co. ，Ltd. ，Beijing 100086，China
^2.Heihe Remote Sensing Experimental Research Station / Key Laboratory of Remote Sensing of Gansu Province，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^3.Xi'an Aerospace Remote Sensing Data Technoloy Co. ，Ltd. ，Xi'an 710100，China
^4.Taohe National Nature Reserve Management Center，Jone 747600，Gansu，China
^5.South China Agricultural University，Guangzhou 510640，China

Received:2024-04-23 Revised:2024-08-28 Online:2024-11-20 Published:2024-12-06
Contact: Yingchun Ge

Abstract

Abstract:

Based on remote sensing Ecological Index （RSEI）， the spatial and temporal changes of ecological quality in 6 Basins in Qilian Mountains from 2000 to 2020 were analyzed， and the effects of driving factors on ecological quality were analyzed by using geographic detectors. The results showed that：（1） RSEI was not significantly increased in Qilian Mountains in 21 a. The proportion of ecological quality remained unchanged， degraded and improved was 78.19%， 4.25% and 17.55%， respectively. The ecological levels of each tributary basin generally exhibit a spatial distribution characterized by a gradual decrease from the upper reaches to the middle and lower reaches. （2） The change of ecological quality in Heihe River Basin， Shule River Basin and Qaidam Basin has a trend of "polarization"， that is， the lower reaches of the basin， the core area of Qaidam basin and other areas with poor ecological quality have degradation risks， while the middle and upper reaches of the basin and the mountainous areas with medium and good ecological quality continue to improve. （3） The results of the geographic detector show that， in general， the explanatory power of natural-human interaction on ecological quality in each basin is better than that of nature-nature and humanity-human interaction. Climate and elevation play a core role in the change of ecological quality in each basin， while the influence of human factors is significantly different. Shiyang River and Heihe River basins， Qaidam Basin， Qinghai Lake and Huangshui River basins are mainly affected by the proportion of primary， secondary and tertiary production respectively， while Shule River Basin is less affected by human factors. The results of this study can provide the decision basis for the sustainable development of Qilian Mountains.

Key words: remote sensing ecological index, ecological quality, geodetector, driving force, Qilian Mountains

CLC Number:

X171.4

Bingbing Chen, Yingchun Ge, Zhonghang Song, Xiangnan Wu, Yu Ai, Ying Yang, Shengtang Wang, Yushuo Liu. Spatio-temporal evolution and driving forces of ecological quality in Qilian Mountains[J]. Journal of Desert Research, 2024, 44(6): 258-267.

Figures/Tables 11

References 41

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自然因子		人文因子
高程	X₁	人口变化率	X₄
年平均气温	X₂	第一产业比重变化率	X₅
年降水量	X₃	第二产业比重变化率	X₆
		第三产业比重变化率	X₇

自然因子		人文因子
高程	X₁	人口变化率	X₄
年平均气温	X₂	第一产业比重变化率	X₅
年降水量	X₃	第二产业比重变化率	X₆
		第三产业比重变化率	X₇

判别标准	交互作用
q(X_i ∩X_j ) min(q(X_i ),q(X_j ))	非线性减弱
min(q(X_i ),q(X_j )) q(X_i ∩X_j ) max(q(X_i ),q(X_j ))	单因子非线性减弱
q(X_i ∩X_j ) max(q(X_i ),q(X_j ))	双因子增强
q(X_i ∩X_j )= q(X_i )+q(X_j )	独立
q(X_i ∩X_j )q(X_i )+q(X_j )	非线性增强

判别标准	交互作用
q(X_i ∩X_j ) min(q(X_i ),q(X_j ))	非线性减弱
min(q(X_i ),q(X_j )) q(X_i ∩X_j ) max(q(X_i ),q(X_j ))	单因子非线性减弱
q(X_i ∩X_j ) max(q(X_i ),q(X_j ))	双因子增强
q(X_i ∩X_j )= q(X_i )+q(X_j )	独立
q(X_i ∩X_j )q(X_i )+q(X_j )	非线性增强

指标	2000年	2005年	2010年	2015年	2020年
NDVI	0.55	0.53	0.51	0.55	0.56
WET	0.26	0.34	0.35	0.37	0.35
NDBSI	-0.002	-0.31	-0.29	-0.14	-0.01
LST	-0.26	-0.72	-0.73	-0.73	-0.75
特征值	0.06	0.08	0.08	0.07	0.07
PC1贡献率/%	72.13	73. 03	72.62	72.45	74.26

Spatio-temporal evolution and driving forces of ecological quality in Qilian Mountains

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流域	指标	退化		不变	改善
流域	指标	-2	-1	0	+1	+2	+3	+4
石羊河流域	级面积/km²	8.00	1 769.68	31 308.29	6 969.70	152.00	0	0
	类面积/km²	1 777.68		31 308.29	7 121.70
	比重/%	4.42		77.87	17.71
黑河流域	级面积/km²	4.00	4 858.57	126 752.15	10 506.32	518.86	36.00	1.00
	类面积/km²	4 862.57		126 752.15	11 062.18
	比重/%	3.41		88.84	7.75
疏勒河流域	级面积/km²	3.00	5 343.43	89 325.31	6 293.84	208.14	1.00	0
	类面积/km²	5 346.43		89 325.31	6 502.98
	比重/%	5.28		88.29	6.43
柴达木盆地	级面积/km²	10.00	12 879.14	192 286.74	55 980.94	385.66	3.00	0
	类面积/km²	12 889.14		192 286.74	56 369.60
	比重/%	4.93		73.52	21.55
青海湖流域	级面积/km²	0	406.97	25 045.65	15 031.08	753.56	2.00	0
	类面积/km²	406.97		25 045.65	15 786.64
	比重/%	0.98		60.73	38.28
大通河-湟水流域	级面积/km²	0	596.30	20 523.10	9 703.93	116.22	0	0
	类面积/km²	596.30		20 523.10	9 820.15
	比重/%	1.93		66.33	31.74
总计	级面积/km²	25.00	25 854.09	485 241	104 485.81	2 134.44	42.00	1.00
	类面积/km²	25 879.09		475 241.24	106 663.25
	比重/%	4.25		78.19	17.55

流域	高程 (X₁)	年平均气温 (X₂)	年降水量 (X₃)	人口分布变化率(X₄)	第一产业比重变化率(X₅)	第二产业比重变化率(X₆)	第三产业比重变化率(X₇)
石羊河流域	0.221	0.185	0.251	0.063	0.299	0.080	0.131
黑河流域	0.078	0.070	0.090	0.066	0.114	0.047	0.098
疏勒河流域	0.191	0.169	0.177	0.033	0.039	0.028	0.019
柴达木盆地	0.233	0.219	0.223	0.023	0.077	0.112	0.082
大通河-湟水流域流域	0.238	0.287	0.272	0.011	0.026	0.088	0.203
青海湖流域	0.151	0.268	0.273	0.036	0.038	0.347	0.353

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