基于InVEST模型的迪庆州水源涵养量时空演变分析

Temporal and Spatial Evolution Analysis of Water Conservation in Diqing Prefecture Based on InVEST Model

针对中国西南高原地区的生态系统水源涵养功能量存在着时间跨度较短、数据难获取等问题。研究以云南迪庆州为例,采用InVEST模型评估了2000-2018年水源涵养功能量和空间分布特征,分析气象条件改变对研究区水源涵养能力的影响,并利用土地利用类型转移矩阵定量分析研究区土地利用类型的时空演变过程。结果表明近20以年来迪庆州的水源涵养功能量波动幅度较大,整体呈下降态势,呈现“西高东低”的空间分布格局;不同土地利用类型的平均水源涵养深度不同,具体表现为林地>草地>耕地>未利用地>水域>建设用地,其中林地的多年平均水源涵养最深,建设用地的多年平均水源涵养最浅。

In view of the short time span and difficulty in obtaining data of water conservation work and energy of ecosystems in the southwest plateau of China.Taking Diqing Prefecture,Yunnan Province as an example,the study uses InVEST model to evaluate the energy and spatial distribution characteristics of water conservation from 2000 to 2018,analyze the impact of changes in meteorological conditions on the water conservation capacity in the study area,and quantitatively analyze the spatio-temporal evolution process of land use types in the study area using the transfer matrix of land use types.The results show that the water conservation work and energy of Diqing Prefecture have fluctuated greatly in the past 20 years,showing a downward trend as a whole,showing a spatial distribution pattern of“high in the west and low in the east”;The average water conservation depth of different land use types is different,specifically,forest land>grassland>cultivated land>unused land>water area>construction land.The average water conservation depth of forest land is the deepest,while that of construction land is the shallowest.