石羊河流域植被净初级生产力时空变化及驱动因素

doi:10.13866/j.azr.2023.05.14

Abstract

Abstract:

We estimated the vegetation NPP using the CASA model (Carnegie-Ames-Stanford Approach) in the Shiyang River Basin from 2000 to 2020 and analyzed the temporal and spatial variations, stability, and the future change trends of NPP. The influencing factors were also studied from three aspects, namely climate factors, topographic factors, and human activities. The results showed the following: (1) The average vegetation NPP in Shiyang River from 2000 to 2020 was 291.01 g C·m^-2·a^-1 and the increase was insignificant. The spatial distribution of vegetation NPP was generally high in the south and low in the north. (2) The proportion of the area of vegetation NPP increased by 86.4% since 2000. The proportions which were extremely significant increased significantly increased were 6.7% and 10.1%, respectively. (3) The proportion of the area where the change in vegetation NPP was moderately above a fluctuation degree [coefficient of variation (C_v)≥0.25] was 50.4%. (4) The future change trend indicated that the ability for vegetation NPP to continuously improve was weak, and the proportion of the area where the vegetation NPP had increased but could be reversed in the future was 57.1%. (5) The vegetation NPP was positively correlated with temperature and precipitation, but it was more sensitive to temperature. With increasing elevation and slope, the vegetation NPP first increased and then decreased. Artificial afforestation and returning farmland to forest and grassland significantly improved the vegetation NPP in recent years.

Key words: vegetation net primary productivity, temporal and spatial change, driving factors, Shiyang River Basin

REN Liwen, WANG Xingtao, LIU Mingchun, WANG Dawei. Temporal and Spatial changes and the driving factors of vegetation NPP in Shiyang River Basin[J].Arid Zone Research, 2023, 40(5): 818-828.

Figures/Tables 10

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Temporal and Spatial changes and the driving factors of vegetation NPP in Shiyang River Basin

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