Temporal and Spatial-Differentiation Characteristics of Ecological Restoration in Loess Plateau
Ecological restoration is an important way to adjust the structure and function of ecosystem in order to cope with the excessive interference of land use. Scientific mastery of restoration pattern and farmland pattern evolution has a profound significance on the management of regional ecological environment and the conserva-tion of vegetation in Loess Plateau. This study, taking Yan'an City in Loess Plateau as a typical area, explores the spatial differentiation characteristics of farmland variation and restoration status from the overall characteristics of ecological restoration, topographic factors and regional differences since ecological restoration. The results show that the arable land of Yan'an City decreased from 11752.80 km2 to 9149.93km2 due to the ecology restora-tion during 2000-2013. The returned farmland is 2756.85 km2, and the returned farmland index is 22.15%. The cultivated land was mostly converted to forest and grassland accounting for 95.29%of the total amount. Farm-land and the returned farmland area was mainly distributed in slope (6~25° ) and the altitude level of Ⅱ(925~1115 m), Ⅲ(1115~1275 m), Ⅳ(1275~1442 m), which accounted for more than 70%of the area. The degree of farmland returning increased gradually with the increase of slope, with the land reclamation rate decreased gradu-ally with the increase of slope and elevation. The highest degree of ecological restoration is the altitude level of IV, and the least is altitude level of Ⅲ. The ecological restoration rate of 2005-2013 was higher than that of 2000-2005. The area and extent of restoration in county decreased from north to south. The center of farmland return-ing and cultivated land is located in the boundary of Ansai county and Baota District which are in the north of Yan'an City. The center of ecological restoration was changing from northeast to southwest while the center of cultivated land was changing from north to south. This study may provide more scientific and reasonable refer-ence for ecological conservation and construction of ecological civilization in Loess Plateau by the analysis of spatial-temporal differentiation characteristics of ecological restoration in Yan'an city.
ecological restorationspatial-temporal differentiationthe Loess PlateauYan'an city
NETL
NSTL
万方数据
维普
