Subjects: Biology >> Botany >> Applied botany submitted time 2023-12-24 Cooperative journals: 《广西植物》
Abstract： In order to grasp the spatial temporal variation characteristics and driving mechanism of vegetation ecological quality in Guangxi, based on multi-source data such as meteorology, terrain, soil and remote sensing, and using the ecological quality index (EQI) as an evaluation indicator, linear trend analysis, correlation analysis and geographical detector method were used to analyze the spatiotemporal changes and driving mechanisms from 2000 to 2020. The results were as follows: (1) Since 2000, the vegetation ecological quality index of Guangxi has significantly increased, and the regional vegetation ecology has improved significantly.The development of vegetation ecological quality has experienced stages of slow growth, rapid growth and significant improvement. In terms of space, the vegetation ecological quality index in Guangxi shows a characteristic of high in four directions and low in the middle, with the high-value areas gradually expanding from the east to the west and north.(2) The influencing factors of spatial and temporal evolution of vegetation ecological quality in Guangxi were significantly different.The overall change of vegetation ecological quality at different altitudes showed a trend of ‘increase-decrease-stability-fluctuation’. The vegetation ecological quality in different soil types is high in loam soil and low in sandy soil. The ecological quality of forest and shrub-grass is high, and the ecological quality of farmland vegetation is low. There is a significant positive correlation between vegetation ecological quality and climate driving factors, which is affected by both temperature and precipitation.The area mainly driven by temperature (T) is the widest, followed by the area mainly driven by precipitation (P). The areas driven strongly ([T+P]+) and weakly ([T+P]-) by temperature and precipitation are smaller.(3) The driving force of changes in vegetation ecological quality change of Guangxi was affected by terrain, soil, vegetation, climate, natural disasters and human activities. The order of explanatory power of natural influencing factors was vegetation > terrain > soil > climate, in which the vegetation net primary productivity and vegetation coverage were the most important factors affecting the spatiotemporal differentiation of vegetation ecological quality. The effects of natural factors on vegetation ecological quality in Guangxi was interactive, showing a nonlinear enhancement and two-factor enhancement relationship, and the interaction between terrain and vegetation, soil and vegetation, and climate and vegetation were the most obvious. Natural disasters and human activities aggravated the impact of vegetation ecological quality change. Among them, meteorological disasters such as drought and low temperature damage inhibited the improvement of vegetation ecological quality, while human activities such as forestry ecological engineering promoted the improvement of vegetation ecological quality. The research results provided scientific theoretical basis and technical support for making reasonable measures of vegetation ecological protection and restoration in Guangxi.
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