Spatia-Temporal Change and Its Human Driving Forces of Woodlands in the Qinling Mountain during the Last 30 Years
|Keywords||Qinling Mountains Woodland types Temporal and spatial variation Driving force Shangluo City|
The Qinling natural dividing line between north and south China regions, the sensitive area of ??global change. Based on the Shangluo City, located in the eastern part of the southern slope of Qinling area, supervised classification method, like Zone Act, landscape pattern index analysis of the spatial and temporal variation on nearly 30 years of of Shangluo City woodland type, and principal component analysis the woodland type change of the study area, the driving force for law and human interference model study, designed to reveal the mechanism of the changes in the human drive of the Qinling mountain woodland type. In this paper, the research results and progress: (1) found similar latitude, climatic conditions similar to the Qinling Ministry the Shangnan and western Lueyang woodland type spatial and temporal changes of the past 30 years both woodland type area of ??landscape indices , the East Qinling the Shangnan of the changes were higher than the western Lueyang. (2) In the past 30 years, the total forest area in Shangluo City an increasing trend 12584.55 km2 from 1978 to 2006 of 14449.44 km2 coniferous forest and shrub area change. In 1990, the destruction of the original woodland serious needle-leaved forest area significantly reduce reduce shrub area between 1990 and 2000, 2000, coniferous and mixed forests, broad-leaved forest area slightly reduced. (3) Shangluo City woodland space changes with altitude close contact was low altitudes and high altitudes woodland overall trend is the same, broad-leaved forest shrub and non-forest land instead of nearly half, but the change is even more dramatic low altitude areas. In the past 30 years, the various types of woodland in the study area are larger transfer increasing trend, although total area of ??woodland, but the original woodland area was reduced year by year. Maximum separation of mixed forest in 1978, a value of 0.124, the fractal dimension of the minimum mixed forest in 1990, a value of 1.347, the maximum fragmentation in the non-forest land in 2006, its value 0.641, natural woodland Shangluo City in the past 30 years, stability in reducing the deepening fragmentation. (4) the impact of various types of woodland change in Shangluo City main driving force for the regional socio-economic development of the force, the income of the farmers and the appropriate amount of arable land, and the impact of the main driving factors for different types of woodland;, woodland type changes with decreasing altitude, the center of gravity of the driving force is also the development of agriculture to regional socio-economic development. (5) by model building human disturbance, found that the degree of human disturbance of Shangluo City in gradually deepened, and with anthropogenic interference with the increase in the strength of the various types of woodland area is changing. Interference level to increase the area for each type of conversion of forest land area, various types of woodland into turn metastasis of human disturbance.