闽赣自然植被覆盖格局及其驱动机制分析

自然植被覆盖格局的研究对生态环境可持续发展具有十分重要的意义。以福建和江西2省为研究区,基于30 m分辨率的植被指数数据,运用地理加权回归模型,结合自然环境和人类活动因素,探索分析闽赣地区自然植被覆盖格局特征及其驱动机制。研究表明:①地形是影响闽赣自然植被覆盖程度的主要因素,江西和福建2省自然植被覆盖程度分别在高程100,300)m和300,500)m区间,与高程相关性最大;在坡度25°和10°以上,与坡度的相关性减弱。②江西主干河流附近农田和城镇交错,福建主干河流附近城镇和林地嵌套,2省自然植被覆盖程度与距河流距离的相关性差异显著。③距离城镇居民点5 km和4 km分别为江西和福建2省自然植被覆盖程度与距居民点距离相关性最弱处。

Vegetation Cover Pattern in Fujian and Jiangxi Provinces and Its Driving Mechanism Based on Geographically Weighted Regression Model

Researching the pattern of vegetation cover is of great significance for the sustainable development of eco-environment.In this article, the characteristics of vegetation cover pattern and its driving mechanism were investigated and analyzed using geographically weighted regression (GWR) model based on vegetation cover index data of 30m resolution.Fujian Province and Jiangxi Province were selected as study area, and natural and human factors were considered in the analysis. Research results revealed that 1) in Fujian and Jiangxi provinces, topography is a main factor affecting the vegetation cover degree which has the strongest correlation with elevation within the range of 100,300) m and 300,500) m respectively, and weak correlation with slope gradient, above 25 ℃ and 10 ℃ respectively; 2) the correlation between vegetation cover degree and distance from river for the two provinces differ greatly. In Jiangxi Province, the mainstream is surrounded by towns and cropland, while in Fujian Province, the mainstream is surrounded by towns and woodland; 3) the distance to residence at 5 km and 4 km has the weakest correlation with vegetation cover degree in Jiangxi and Fujian, respectively.