2000—2019年鄱阳湖生态经济区水源涵养时空变化

水源涵养是生态保护的一个重要方面,对鄱阳湖生态经济区生态保护具有重要意义。本文基于InVEST模型,对鄱阳湖生态经济区2000—2019年产水和水源涵养时空变化进行了分析,并运用空间自相关探究了高程、坡度与水源涵养功能的空间关系。结果表明:①鄱阳湖生态经济区多年平均产水深度为971.04 mm,多年平均水源涵养深度为299.298 mm;②2000—2019年水源涵养深度先上升后下降,变化幅度较大,整体呈上升趋势;③水源涵养功能呈地域分布,重要区和极为重要区主要分布在东部和西北部林地,一般重要区分布在鄱阳湖平原;④水源涵养与高程和坡度呈正相关,高值多出现在高海拔和坡度较大的地区。

Spatio-temporal changes of water conservation in Poyang Lake ecological economic zone from 2000 to 2019

Water conservation is an important aspect of ecological protection, which is of great significance to the ecological protection of the Poyang Lake ecological economic zone. Based on the water production module of the InVEST model, this paper analyzes the temporal and spatial changes of water production and water conservation in the Poyang Lake ecological economic zone from 2000 to 2019, and uses spatial autocorrelation to explore the spatial relationship between elevation and slope and water conservation functions. The results show that: ①The multi-year average water production depth of the Poyang Lake ecological economic zone is 971.04mm, and the multi-year average water conservation depth is 299.298mm. ②The water conservation depth of the study area increased first and then decreased, with a large change, showing an upward trend as a whole. ③The water conservation function is geographically distributed, and the important and extremely important areas are mainly distributed in the eastern and northwestern woodlands. The general important areas are distributed in the Poyang Lake plain. ④Water conservation is positively correlated with elevation and slope, and high values of water conservation mostly occur at high altitudes and steep slopes.