毛乌素沙地东南缘植被NDVI时空变化及其对气候因子的响应

doi:10.12118/j.issn.1000-6060.2021.017

Abstract

Abstract:

A central element in understanding the dynamic relationship between ecosystems is achieved by understanding the response of vegetation growth to climate change. Based on the meteorological data and normalized difference vegetation index (NDVI) from 1990 to 2018, the variation in the NDVI of different types of vegetation in the southeast margin of Mu Us Sandy Land of Shaanxi, China during the growing season was analyzed via use of a partial correlation analysis and geographic detector data, and the effects of temperature and precipitation on various types of vegetation are discussed. The results show that: (1) In the growing seasons from 1990 to 2018, the annual NDVI for vegetation across the whole region increased significantly by 97.9%, and the overall eco-environmental quality was significantly improved. The growth rate of the annual NDVI of vegetation was slow prior to 2005, and then it increased sharply with a rate of increase of 0.011·a^-1; across the observed increases, the annual NDVI related to shrub vegetation increased the most. (2) The year 2000 represented a transition year; a significant change in the behavior of the total precipitation and annual air temperature was observed in the year 2000. The total precipitation was seen to decrease at a rate of -5.510 mm·a^-1 before this transition year and increase with a rate of 5.541 mm·a^-1 after this transition year; these values were dominated by heavy rainfall events. Prior to this abrupt change in the year 2000, the annual rate of increase of annual extreme daily mean temperature and annual minimum daily mean temperature were 0.122 ℃·a^-1 and 0.230 ℃·a^-1, respectively. After the year 2000, the average annual decreasing rate of annual extreme daily mean temperature was -0.014 ℃·a^-1, and the average annual rising rate of annual minimum daily mean temperature was 0.022 ℃·a^-1. (3) In the slow growth stage of the NDVI (1990—2005), the annual minimum daily mean temperature was positively correlated with the annual NDVI of different types of vegetation, and had the greatest influence; in the rapid growth stage of annual NDVI (2006—2018), the total precipitation was positively correlated with the annual NDVI of different types of vegetation, and the frequent occurrence of heavy rainfall events meant that the total precipitation had a dominant effect on the growth of vegetation. This work finds that the interaction between total precipitation and annual air temperature, especially the annual minimum daily mean temperature, is the key factor in the promotion of the growth of vegetation.

Key words: Mu Us Sandy Land, climatic factor, normalized difference vegetation index (NDVI), geographic detector, extreme-point symmetric mode decomposition (ESMD)

HE Junqi,WEI Yan,GAO Wande,CHEN Yunfei,MA Yandong,LIU Xiuhua. Temporal and spatial variation of vegetation NDVI and its response to climatic factors in the southeastern margin of Mu Us Sandy Land[J].Arid Land Geography, 2022, 45(5): 1523-1533.

Figures/Tables 11

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References 26

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交互作用类型	q值关系
非线性减弱	q(X₁∩X₂)<Min[q(X₁), q(X₂)]
单因子非线性减弱	Min[q(X₁), q(X₂)]<q(X₁∩X₂)<Max[q(X₁), q(X₂)]
双因子增强	q(X₁∩X₂)>Max[q(X₁), q(X₂)]
独立	q(X₁∩X₂)=q(X₁)+q(X₂)
非线性增强	q(X₁∩X₂)>q(X₁)+q(X₂)

植被类型	像元数	占比/%	变化率/a^-1	决定系数（R²）	P值
栽培植被	14465	48.3	0.010	0.864	<0.01
草原	14274	47.7	0.008	0.903	<0.01
灌丛	678	2.3	0.014	0.840	<0.01
草甸	407	1.3	0.009	0.896	<0.01
阔叶林	45	0.1	0.006	0.886	<0.01
草丛	37	0.1	0.011	0.842	<0.01
荒漠	37	0.1	0.009	0.790	<0.01
沼泽	20	0.0	0.007	0.840	<0.01

	植被类型	年均高温			年均低温			年总降水量
	植被类型	1990— 2018年	1990— 2005年	2006— 2018年	1990— 2018年	1990— 2005年	2006— 2018年	1990— 2018年	1990— 2005年	2006— 2018年
NDVI	栽培植被	-0.33	-0.33	-0.36	0.66^**	0.51^*	0.52	0.53^**	0.02	0.92^**
	草原	-0.38^*	-0.42	-0.18	0.68^**	0.58^*	0.35	0.50^**	-0.07	0.88^**
	草甸	0.01	0.11	-0.17	0.55^**	0.38	0.14	0.56^**	0.31	0.81^**
	灌丛	-0.49^**	-0.54^*	-0.31	0.67^**	0.53^*	0.44	0.54^**	-0.06	0.91^**

植被类型	影响因子	q值	P值
栽培植被	年均高温/℃	0.287	0.341
	年均低温/℃	0.548	0.003^**
	年总降水量/mm	0.541	0.023^*
草原	年均高温/℃	0.354	0.396
	年均低温/℃	0.535	0.062
	年总降水量/mm	0.727	0.000^**
草甸	年均高温/℃	0.390	0.310
	年均低温/℃	0.713	0.000^**
	年总降水量/mm	0.399	0.599
灌丛	年均高温/℃	0.237	0.537
	年均低温/℃	0.501	0.007^**
	年总降水量/mm	0.622	0.049^*

植被类型	交互作用	交互值	影响力
栽培植被	X₁∩X₃	0.593	双因子增强
	X₂∩X₃	0.802	双因子增强
草原	X₁∩X₃	0.797	双因子增强
	X₂∩X₃	0.921	双因子增强
草甸	X₁∩X₃	0.587	双因子增强
	X₂∩X₃	0.956	双因子增强
灌丛	X₁∩X₃	0.634	双因子增强
	X₂∩X₃	0.827	双因子增强

Temporal and spatial variation of vegetation NDVI and its response to climatic factors in the southeastern margin of Mu Us Sandy Land

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