干旱区沙质草地植被覆盖变化模拟: Ⅰ.模型

 在干旱、半干旱地区,影响沙质草地植被覆盖的因素主要包括土壤水分、植被生长和风沙运动。根据这三方面的已有研究成果,建立了植被覆盖变化概念模型和数学模型。模型包括栅格水流模型、径流模型、地下水补给模型、土地生产潜力模型等。结合GIS技术,该模型可用于模拟干旱区沙质草地的土壤水分补给量变化、流沙面积变化和植被覆盖变化的空间分布。

Simulation Method of Vegetation Coverage in Arid Sandy Grassland: I. Models

Water replenishment, vegetation growth and wind-sand movement are the main factors that contribute to the change of vegetation coverage on sandy grassland in arid and semi-arid region. The conceptual and mathematical models of vegetation coverage are set up based on the researches on these three factors. The main models are grid water flow model, runoff model, ground water supply model, potential land productivity model. The model, combined with GIS technology, can show the spatial distribution characters of soil water supply, sand area and vegetation coverage change on sandy grassland in arid region.