秦巴山区夏季NDVI变化特征及其对气候因子的响应

doi:10.13866/j.azr.2023.10.03

Abstract

Abstract:

Monthly summer NDVI and meteorological data from February to August, 2001-2019, were used to analyze the changes in NDVI and the time lag effects of NDVI on climate factors in the Qinling-Daba Mountains. The results showed that NDVI presented an overall increasing trend in the Qinling-Daba Mountains, and the area with a highly significant increase in NDVI accounted for the largest proportion, with a value of 77.1%. There were positive correlations between NDVI and the temperature and precipitation, in which the correlations between NDVI and temperature were higher than those with precipitation. The response of the NDVI to climate factor changes showed significant time lag effects, and the spatial distributions of the lag time had regional differences. In the western regions of the Qinling-Daba Mountains, NDVI had a timely response to temperature changes and a 2-month lag response to precipitation changes. In the central regions, the lag time of the NDVI responses to temperature and precipitation changes varied with latitude. There were generally 1-and 0-month lag responses for temperature changes and 0-and 3-month lag responses for precipitation changes from north to south, respectively. In the northeastern regions there was a 3-month temporal lag in NDVI to the changes in temperature and precipitation. In the southeastern regions, NDVI had a timely response to temperature change and a 3-month lag response to precipitation change. This study provides scientific basis for summer storm and geological disaster warnings in the Qinling-Daba Mountains.

Key words: NDVI, climate factors, trend analysis, the Qinling-Daba Mountains, time lag responses

FU Shasha, PENG Wei, SHAO Aimei, CAI Dihua, LUO Miaoxin, LIU Zhaojing. Variations in the NDVI characteristics during the summer and the climatic factor responses in the Qinling-Daba Mountains[J].Arid Zone Research, 2023, 40(10): 1563-1574.

Figures/Tables 14

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Tab. 1

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Tab. 2

Division of the degree of correlation between NDVI and climate factors"

相关程度	相关系数	正相关面积比/%		负相关面积比/%		合计
相关程度	相关系数	NDVI-降水	NDVI-气温	NDVI-降水	NDVI-气温	合计
强	0.7< $r x y$ ≤1	0.2	4.0	0.1	0.1	4.4
中等	0.4< $r x y$ ≤0.7	19.7	18.3	2.1	1.0	41.1
弱	0< $r x y$ ≤0.4	20.8	15.4	9.8	3.3	49.3
合计		40.7	37.7	12.0	4.4

Tab. 2

Fig. 9

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Fig. 11

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变化类型	F检验显著性水平	NDVI变化斜率	面积覆盖百分比/%
极显著增加	P≤0.005	slope≥0.002	77.1
显著增加	0.005<P≤0.05	slope≥0.002	9.3
略微增加	0.05<P≤0.1	slope≥0.002	2.4
基本不变	P>0.1	-0.002<slope<0.002	4.9
略微减少	0.05<P≤0.1	slope≤-0.002	0.3
显著减少	0.005<P≤0.05	slope≤-0.002	0.6
极显著减少	P≤0.005	slope≤-0.002	0.7

Variations in the NDVI characteristics during the summer and the climatic factor responses in the Qinling-Daba Mountains

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