渭河流域植被覆盖变化趋势及其对土壤干湿状况的响应

doi:10.12118/j.issn.1000-6060.2023.489

Abstract

Abstract:

With the rapid global climate change and the swift urban development in the Weihe River Basin, the vegetation ecosystem in this region faces numerous challenges. Investigating the spatiotemporal changes in vegetation and their response to soil moisture conditions is crucial. Utilizing normalized difference vegetation index (NDVI) and land surface temperature (LST) data from MODIS for the years 2001 to 2020, this study inverted the soil moisture conditions in the Weihe River Basin, northwest China. Through linear regression, residual analysis, and contribution analysis, we thoroughly examined the spatiotemporal characteristics of vegetation cover during the growing seasons and the driving factors and contributions to soil moisture conditions from 2001 to 2020. The results indicate: (1) During the period from 2001 to 2020, the overall trend of the growing season NDVI mean values in the Weihe River Basin exhibited a fluctuating increase, with an average trend rate of 0.47×10^-2·a^-1. The vegetation showed a recovery trend. However, during the years 2012 to 2016, the growing season NDVI mean values experienced a declining trend, attributed to the inhibitory effect of human activities. (2) The impact of soil moisture conditions and human activities on the growing season NDVI in the Weihe River Basin diverged significantly. The influence of soil moisture conditions primarily exhibited a relatively weak and slow growth effect, while the impact of human activities was mainly characterized by promoting vegetation recovery. (3) The contributions of soil moisture conditions and human activities to the changes on the growing season NDVI mean values in the Weihe River Basin were mainly concentrated in the same direction. Negative contributions, accounting for 19.77%, were solely attributed to soil moisture conditions. On the other hand, positive contributions, indicating higher influence, primarily originated from human activities. This suggests that human activities are the primary driving force behind vegetation cover changes in the Weihe River Basin. (4) The overall vegetation in the Weihe River Basin is influenced by a dual promotion from both soil moisture conditions and human activities. Inhibitory effects are primarily concentrated in the agricultural ecological zone of the Fenwei Basin, which corresponds to a high contribution rate from human activities in the same direction. This suggests that current human activities are the main factor inhibiting the growth of vegetation cover. This study can provide a more accurate scientific basis for ecological conservation and sustainable development in the Weihe River Basin.

Key words: vegetation change, soil moisture status, human activities, vegetation cover, residual analysis, Weihe River Basin

HUANG Yunbo, ZHANG Chong, WANG Yudan. Change trend of vegetation cover and its response to soil moisture status in Weihe River Basin[J].Arid Land Geography, 2024, 47(5): 841-849.

Figures/Tables 8

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生长季NDVI均值变化趋势	总体				土壤水分				人类活动
生长季NDVI均值变化趋势	江河源区生态区	黄土高原生态区	汾渭盆地生态区	秦巴山地生态区	江河源区生态区	黄土高原生态区	汾渭盆地生态区	秦巴山地生态区	江河源区生态区	黄土高原生态区	汾渭盆地生态区	秦巴山地生态区
快速降低	0.00	0.00	0.02	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.01	0.00
中速降低	0.00	0.01	0.41	0.02	0.00	0.00	0.00	0.00	0.00	0.00	0.30	0.00
缓慢降低	0.01	0.14	3.54	0.14	0.00	0.03	0.26	0.03	0.00	0.11	3.54	0.14
影响较弱	0.19	6.13	8.26	3.29	0.24	46.43	24.09	7.19	0.21	8.50	8.55	4.06
缓慢增长	0.05	40.40	11.07	5.30	0.00	18.65	0.32	2.70	0.03	49.22	11.45	5.54
中速增长	0.00	18.39	1.37	1.17	0.00	0.05	0.00	0.00	0.00	7.31	0.83	0.18
快速增长	0.00	0.09	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.02	0.00	0.00

贡献率/%	土壤水分				人类活动
贡献率/%	江河源区生态区	黄土高原生态区	汾渭盆地生态区	秦巴山地生态区	江河源区生态区	黄土高原生态区	汾渭盆地生态区	秦巴山地生态区
<-100	0.00	0.02	0.07	0.03	0.00	0.00	0.00	0.00
-100~-75	0.00	0.06	0.18	0.07	0.00	0.00	0.00	0.00
-75~-50	0.00	0.14	0.30	0.11	0.00	0.00	0.00	0.00
-50~-25	0.01	0.44	0.83	0.32	0.00	0.00	0.00	0.00
-25~0	0.04	7.79	7.15	2.20	0.00	0.00	0.00	0.00
0~25	0.09	34.10	13.43	2.84	0.00	0.24	0.07	0.10
25~50	0.06	17.45	2.01	2.57	0.02	4.89	0.50	1.50
50~75	0.02	4.73	0.52	1.44	0.06	17.53	2.01	2.59
75~100	0.01	0.51	0.22	0.24	0.09	34.18	13.68	2.87
>100	0.00	0.00	0.00	0.00	0.06	8.48	8.45	2.68

Change trend of vegetation cover and its response to soil moisture status in Weihe River Basin

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