Study of Water Resources Carrying Capacity of Pinus Sylvestris Var. Mongolica Fixing Sand Forest at Zhanggutai Town, Based on GIS
|School||Liaoning Technical University|
|Course||Soil and Water Conservation and Desertification Combating|
|Keywords||Land use GIS technology landscape water resources carrying capacity Pinus sylvestris var. mongolica recession|
Using remote sensing image, with GIS technology and mathematical statistic method, land use changes and water resources carrying capacity of Pinus sylvestris var. mongolica fixing sand forest at Zhanggutai town were analyzed. The results showed that: The land use structure has changed dramatically within 21 years, area of all land use types and land use degree index changed variously. In 1988 -2001 and 2001 -2009, 58% and 52% of the total area’s land changed in space, respectively. The transfer mainly happens in woodland, farmland and grassland, and unused land. Landscape diversity index and evenness index decreased, the heterogeneity of landscape types reduced and tends to uniformity and anisotropy. Land use change mainly affected by the policy and population.Due to land use change, water consumption increased, were mainly affected by broad-leaved forest. The rainfall at Zhanggutai shows cyclical; land use change has no effect on rainfall, but influenced surface water and groundwater. Water resources’reduction at Zhanggutai was due to irrational land use structure, which caused excessive water consumption. Because the change of land use structure, water supply capacity of Pinus sylvestris var. mongolica’s decreased 71.3%, water carry capacity fell 77.9% from 1988 to 2009.The recession of Pinus sylvestris var. mongolica were due to the extreme drought and the irrational land use structure which caused excessive consumption of water as well as the high density. Pinus sylvestris var. mongolica should remain the preferred species in this area. The ratio of broad-leaved forest should be limited. The high intensity thinning of existing high density forest should be implemented. And implement the returning of forest(cultivated) land to grassland,furthermore development of open forest-grassland as the main type of shelter should be taken.