城市化背景下赣江流域植被初级生产力的时空变化

城市化对植被初级生产力的变化具有重要影响,本文在前人研究的基础上进一步研究城市化过程中建设用地扩张等人类活动对植被初级生产力的间接影响,以赣江流域为例,探究了2000-2015年十五年里城市建成区变化情况,并从整个流域与城市两个尺度分析2000-2015年赣江流域植被初级生产力时空变化特征,探究了建成区面积与降水、气温等气象因子的关系。结果表明,2000-2015年赣江流域植被初级生产力除部分建设用地地区总体呈现上升趋势,其中非建成区呈现显著增加趋势,平均每年增加2.297 d/km²。在城市尺度上,随着建成区面积的增大,城市植被初级生产力也随着不断上升。另外,研究表明,气温与降水等气象因子对城市植被初级生产力具有一定的推动作用。

A Study on the Temporal and Spatial Changes of Vegetation Primary Productivity in Ganjiang River Basin Based on the Background of Urbanization

Urbanization has an important impact on the change of vegetation primary productivity.Based on previous studies,this paper further studies the indirect impact of human activities such as construction land expansion on vegetation primary productivity in the process of urbanization.Taking Ganjiang River Basin as an example,the spatial and temporal variation characteristics of vegetation primary productivity in Ganjiang River Basin from 2000 to 2015 were analyzed from the whole basin and city scales and explore the relationship between the built-up area and the meteorological factors such as precipitation and temperature.The results showed that,from 2000 to 2015,except for some construction land areas,the vegetation primary productivity of Ganjiang River Basin showed an overall upward trend,and the non-built-up areas showed a significant increase trend,with an average annual increase of 2.297 d/km².On the urban scale,with the increase of the built-up area,the primary productivity of urban vegetation is also rising.In addition,the study shows that the meteorological factors such as temperature and precipitation have a certain role in promoting the primary productivity of urban vegetation.