Study On The Impact Of Artificial Corridor Landscape Fragmentation In Nature Reserves

The expansion of artificial corridor, and the subsequent changes to the surrounding landscape not only lead to landscape fragmentation but also have been shown to be a key driver of biodiversity loss and ecosystem degradation. Local declines of species abundance as well as changes in animal behaviour have drawn attention to wider ecosystem effects including altered species composition and a degradation of ecosystem functioning. However, methods for measuring and quantifying the distribution and environmental impacts of roads are not yet fully developed. Now author present a new technique for assessing the potential impacts of roads on biodiversity using a spatial road disturbance index(SPROADI) and kernel density estimation(KDE). According to the 1997 and 2013 RS images combined with the same period of land use classification figure. Using Arc GIS software to establish the artificial corridor database of Jiuzhai Valley National Park. Combined with visualization technology, analysis the development and evolution of Jiuzhai Valley National Park in two different periods. The findings shown artificial corridor ecological effect and relationship between the characteristics and landscape fragmentation in National Park. The analyzed is calculated from three sub-indices: traffic intensity as a measure of traffic volume per time and space; vicinity impact, which is the assessment of edge effect of roads on adjacent habitats(the road-effect zone); and fragmentation grade, which provides an indication of the degree to which the landscape is intersected by roads. The findings revealed the expansion of artificial corridor doubled in 15 years, reflect the constructions have high consistency with the expansion of Jiuzhai Valley National Park, artificial corridor density increased by 1.96 times in 15 years. But has obvious differences from differences Valley, such as Danzu Valley and so on. Artificial corridor density are less than 0.001 km/km2 in 15 years. On the contrary. In 1997, shuzheng Valley and rize Valley, Artificial corridor density distribution is 0.309 km/km2 and 0.167 km/km2 respectively, difference reached 1.83 times. But in 2013 were 0.569 km/km2 and 0.412 km/km2 respectively, difference reached 1.38 times. Three main Valley traffic constructions develop into balance. After the rapid evaluations of the situation of landscape fragmentation, highest artificial corridor effects area are wuhuahai area, nuorilang central station and shuzheng village. There is corresponding relationship between SPROADI and three partial matching by calculation, the highest corresponding partial matching i s traffic intensity(r = 0.714) followed by vicinity impact(r = 0.703) for the lowest fragmentation grade,(r = 0.655). Finally, we propose five specific ways of improving the development of artificial corridor in Jiuzhai Valley National Park.