摘要
通过对晋陕蒙砒砂岩区沙棘生态工程实施前1年(1998年)、中期(2003年)、最后1年(2008年)3个控制年份的景观异质性对比分析,以期从理论上进行高度概括,更好地指导类似生态工程建设项目。在种植沙棘后的砒砂岩区,沙棘斑块密度、边缘密度、聚集度等指数,从2003年向2008年略有增加。区域内持续的沙棘生态工程建设,形成区域化、片段化的沙棘林,导致了这些指数的变大。沙棘破碎化指数从呈微弱减小趋势,在造林面积几乎增加一倍的前提下,部分斑块整合到一起,致使破碎度指数有所下降。随着沙棘等生态工程的不断推进,区域内景观多样性指数和均匀度指数都有所提高,同时整个景观优势度指数逐渐降低,向更加和谐的景观系统转变。
The analysis of landscape heterogeneity for the seabuckthorn project in the Soft Sandstone Area（SSA） from 1998,2003,2008 aimed at both theoretical summery in landscape ecology and practical utilization for ecological engineering project.In SSA,the artificial seabuckthorn forest＇ patch density,edge density,aggregation degree,etc.,have slightly increased from 2003 to 2008 after continuous seabuckthorn planting,though fragmented and regionalized.The small patches mix together to form larger ones,and the fragmentation index（F） appears to be gradually decreased after doubled area of seabuckthorn afforestation in the area.Along with the project,the diversity indexes and evenness have been increasing but the dominance index decreasing,toward a more harmonious landscape system in SSA.
基金
晋陕蒙砒砂岩区沙棘生态工程(水规计[1998]111号)
关键词
砒砂岩
沙棘
斑块密度
边缘密度
聚集度
破碎度
多样性指数
soft sandstone area（SSA）
seabuckthorn
patch density
edge density
aggregation degree
fragmentation index
Shannon-Weaner diversity index
