Abstract: 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.

Key words: Poyang Lake ecological economic zone, InVEST model, water conservation, spatio-temporal changes, spatial pattern, bivariate spatial autocorrelation