摘要
对晋陕蒙砒砂岩区实施沙棘生态工程始期(1998年)、中期(2003年)、末期(2008年)3个时期(控制年份)景观斑块特征的研究结果表明:沙棘林景观的斑块变化最为明显。从斑块数量上来看,各粒级斑块数量均有所增加;在各斑块所占的比例上,小斑块比例在减小,中斑块、大斑块及巨斑块的比例在迅速增加。说明沙棘生态工程的实施使得该区沙棘林景观小斑块逐渐连结为更大的斑块。在其生态工程实施的各期,沙棘林的类斑近圆指数从中期2003年的1.86增加到末期2008年的2.65,变化较为明显,体现出在沙棘萌蘖性能的影响下,景观斑块形状逐渐变得复杂。沙棘林斑块分维数从中期2003年的1.056 6增加到末期2008年的1.080 2,在持续开展沙棘造林的过程中,斑块数增加,面积增加,边界趋于更加复杂,与其形状指数显示的结果相一致。该区复杂的斑块形状是沙棘林向外迅速扩张的活力表征。此外,还对该区实施沙棘生态工程各期的盖沙地、水域、居民地、灌丛、稀疏植被、林地、草地、未利用地等的景观斑块特征作了分析。
Through the observation of the patch characteristics in landscape of soft sandstone area in different stages of the year 1998, 2003 and 2008 in ecological engineering plantation of seabuckthorn in Shanxi, Shangxi and Inner Mongolia, it showed that there was a significant change in seabuckthorn patch of landscape. In different scales of patch size, patch number increased. For the rate of each patch size, small sized ones decreased while middle, large and super large patches increased rapidly. This demonstrated the implementation of ecological engineering of seabuck- thorn plantation realized small patches into larger ones. In different stages of that, the circle index increased from 1.86 to 2. 65 from 2003 to 2008, this may be explained as the outcome of higher ability of tillering of seabuckthorn. And the fractal dimension index of it increased from 1. 056 6 to 1. 080 2 from 2003 to 2008. in the process of seabuck- thorn plantation, the number and area of patches increased and had more sophisticated boundary, showing consisten- cy with its shape indices. This sophisticated boundary was an active symbol of fast expansion of seabuckthorn forest, moreover, I also analyzed the patch characteristics of sand land, watershed, residential area, shrub, sparse vegetation area, wood, grassland, and non-cultivated land in the ecological engineering area of seabuckthorn plantation.
出处
《西部林业科学》
CAS
2011年第2期1-6,共6页
Journal of West China Forestry Science
基金
晋陕蒙砒砂岩区沙棘生态工程(水规计[1988]111号)
关键词
晋陕蒙
砒砂岩区
沙棘生态工程
景观
斑块特征
Shanxi Shangxi and Inner Mongolia
soft sandstone area
ecological engineering of seabuckthorn plantation
landscape
characteristics of patch
