文献类型：期刊文献

中文题名：林地景观点格局的样带梯度分布与空间聚集特征——以重庆三峡库区生态屏障区为例

英文题名：Gradient distribution of belt transects and characteristics of spatial clustering of point pattern of woodland landscapes: A case study of ecological barrier zone of Three-Gorges Reservoir in Chongqing

作者：王金亮[1,2] 黄志霖[1] 邵景安[2,3] 李阳兵[2]

第一作者：王金亮

机构：[1]中国林业科学研究院森林生态环境与保护研究所/国家林业局森林生态环境重点实验室;[2]重庆师范大学地理与旅游学院;[3]重庆师范大学三峡库区山地生态与区域发展研究所

年份：2013

卷号：32

期号：2

起止页码：308-317

中文期刊名：地理科学进展

外文期刊名：Progress in Geography

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家科技支撑计划课题项目(2011BAD38B04);重庆市自然科学基金一般项目(2009BB7239)

语种：中文

中文关键词：林地景观;点格局;RipleyK函数;空间聚集;生态屏障区;三峡库区;重庆

外文关键词：forest landscape; point pattern; Ripley K function; spatial cluster; ecological barrier zone; Three-Gorges Reservoir; Chongqing

分类号：P315.5

摘要：从点格局角度研究林地及其不同类型景观格局的空间分布特征,以探求空间异质性在林地景观中的连续变化和分布趋势。选取点格局密度和Ripley K函数,建立重庆库区生态屏障区不同样带和1997-2005年间林地景观的点格局数据库,以此分析林地及其3种不同类型景观的样带梯度分布和空间聚集特征变化。结果表明:①研究区林地景观点格局的样带梯度分布在整体上表现出空间极不均衡特征,中心点上游林地景观点格局密度呈"双峰"梯度空间分布特征,下游呈"阶梯"梯度空间分布特征;②在各级空间尺度和时间变化上,屏障区林地景观格局都表现出局部空间聚集分布,与1997年相比,2005年林地分布范围在扩张,且空间分布均匀程度在提高,而空间聚集分布的特征在减弱;③有林地景观空间聚集特征与整体林地景观接近一致,有林地的基质优势在减弱。灌木林地分布在空间上比有林地更为集聚,在时间上聚集程度也在加强。疏林地由于在空间上扩张速度快致使其空间聚集发生减弱,空间分散性更大。
From the perspective of point pattern, this paper presents a study of the distribution mechanism of spatial characteristics of woodland and its different types of landscapes, in order to explore the continuous change and the trend of spatial heterogeneity distribution of woodland landscapes, and provide the basis for rational planning and construction of woodland landscapes. By using point process density and Ripley K function, we established different belt transects for the ecological barrier zone of Three Gorges Reservoir in Chongqing, created the point pattern database for the woodland landscapes from 1997 to 2005, and then analyzed the gradient distribution of the belt transects and the change of the spatial clustering of the woodland and its three different types of landscapes. The results indicated that： （1） the gradient distribution of the belt transects as a whole was strikingly unbalanced, with the point process density showing ＂twin peak＂ distribution upstream of center point, and gradient distribution downstream of it. （2） As for the changes in different spatial and temporal scales, the point patterns of all woodland landscapes in the barrier zone showed distribution of local spatial clustering. Although the largest L（d） value of the spatial scale were both 40 km in 1997 and 2005, the range of woodland distribution expanded since 2005; Uniform spatial distribution increased, and spatial clustering decreased. （3） The characteristics of spatial clustering of forest land coincided with overall woodland landscapes, the largest L（d） value of the spatial scales were both 40 km in 1997 and 2005, but the forest land started to lose its natural advantages. Distribution of shrub land was more clustered in space in comparison to forest land, and the degree of clustering increased with time, with the largest L（d） values of spatial scales being 50 km in both 1997 and 2005. Open forest land expanded rather fast, and became dispersed in space as a result of reduced spatial clustering. The largest L（d） value of spatial scales was 40 km in 1997 and 30 km in 2005.