摘要
通过设置西北至东南方向样带的方式,对唐家河自然保护区的遥感解译图像从景观和类型两种水平上分析了该区植被景观格局的梯度变化。结果表明:1)该区域内森林植被状况良好,林地分布面积达到91.65%。其中,常绿落叶阔叶混交林的面积最大,是区域的景观基质,而亚高山灌丛草甸以及农耕地等在整个区域内分布面积较小,边界较简单,景观地位弱。2)沿样带方向,景观水平上的指数具有上升型、下降型和无明显趋势3种变化,表现为边界密度、邻近度、形状指数、斑块分形指数的递增,平均斑块面积和最近距离的递减,以及香农多样性和均匀性、最大斑块面积和散布与并列指数的稳定波动。3)该区景观类型以次生落叶阔叶林、常绿落叶阔叶混交林、针阔叶混交林和针叶林为主,其景观指数波动变化显著、具明显的峰值。
To explore gradient variations of landscape pattern in Tangjiahe nature reserve, the belt transect （width of 2 km and length of 22 km） was set from northwest to southeast on the remote sensing vegetation image by employing GIS technology. Our results indicate that： （1） as a well-developed vegetation type, the woodland distributes widely in the nature reserve and occupies approximately 91.65% of the total study area. In detail, the evergreen broad-leaved and deciduous broad-leaved mixed forest is considered as background of landscape in the reserve because of biggest distribution area. In contrast, sub-alpine shrub meadow and farmland have lower heterogeneity degree because of small area and simple patch edge. （2） With space change from northwest to southeast, the landscape indices vary in three different ways at the landscape scale： increasing, decreasing and no consistent trend. In general, value of some indices, such as edge density, mean proximity index, landscape shape index and mean patch fractal dimension, maintains a increasing trend along the belt transect, but the value of mean patch size index and mean nearest neighbor distance index decrease obviously. The otherindices such as Shannon＇s diversity index, Sharmon＇s evenness index, largest patch index and interspersion juxtaposition index keep a steady fluctuate. （3） On the other hand, secondary deciduous broad-leaved forest, evergreen broad-leaved and deciduous broad-leaved mixed forest, coniferous and broad-leaved mixed forest and coniferous forest are dominant classes at the patch scale, and have obvious peaks in variation of landscape indices value along belt transect in the reserve.
出处
《云南植物研究》
CAS
CSCD
北大核心
2009年第1期49-56,共8页
Acta Botanica Yunnanica
基金
四川省教育厅青年基金项目(2002B18)
四川省重点学科建设项目(SZD0420)
关键词
梯度分析
景观格局
植被景观
景观指数
唐家河自然保护区
Gradient analysis
Landscape pattern
Vegetation landscape
Landscape Index
Tangjiahe nature reserve
