Analysis on driving forces of net primary productivity of vegetation in semiarid region of northwest China

doi:10.14088/j.cnki.issn0439-8114.2022.05.033

Abstract

Abstract: In order to explore the driving factors of net primary productivity（NPP） and its contribution rate under the special ecological environment in semi-arid areas, and reveal the driving ability of environmental factors on NPP in different environmental attributes sub-regions in semi-arid areas, the Yili river valley in Xinjiang was taken as the study area. The stepwise regression method was used to analyze the data of NPP, NDVI, meteorology, topography, land use and soil erosion, and to construct the NPP environmental factor model. The correlation analysis was used to explore the correlation between each factor and NPP and the correlation between each factor, and the factor contribution rate was used to clarify the driving ability of environmental factors to NPP. Studies have shown that the dominant factors of NPP in the study area were NDVI, humidity index and annual average temperature. NDVI, average annual precipitation, moisture index, average annual temperature and dryness were significantly correlated with NPP in semi-arid region （P < 0.01）. Under different humidity index ranges, the driving ability of each environmental factor to NPP was significantly different. The strongest driving factor of NPP in the region with humidity index less than 0 was NDVI （P < 0.01）, while the region with humidity index more than 0 was precipitation （P < 0.01）. There were significant differences in the main contribution factors and contribution rates of NPP between different soil erosion types and land use types （P < 0.01）. The driving characteristics of meteorological, NDVI and topographic factors on NPP under various environmental conditions were revealed, which provided a scientific basis for the study of NPP driving force in semiarid regions.

Key words: semiarid region, net primary productivity（NPP）, humidity index, factor contribution rate, driving force

CLC Number:

Q148

HAN Huan-huan, GAO Min-hua, ZAN Mei. Analysis on driving forces of net primary productivity of vegetation in semiarid region of northwest China[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(5): 186-192.

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