Lu Jianguo, Wang Haitao, He Xingdong, Gao Yubao
College of Life Science, Nankai University, Tianjin 300071, China.
Ying Yong Sheng Tai Xue Bao. 2006 Aug;17(8):1469-74.
Spatial heterogeneity affects the functions and processes of ecosystems. By the methods of statistics and geostatistics, this paper approached the relationships between the spatial heterogeneities of Artemisia ordosica and soil moisture on the semi-fixed dune of Mu Us sandy land. The results showed that on plot-scale (80 m x 80 m), the spatial heterogeneity of A. ordosica biomass and density was dependant on that of soil moisture, and in particular, there existed a significant positive correlation between the biomass and the moisture, indicating that on semi-fixed dune, soil moisture played a decisive role in the spatial heterogeneity of plant population. Due to the redistribution of precipitation on sand dune, the outcomes of the interactions between the spatial heterogeneities of soil moisture and A. ordosica population were assumed as patchness of terrain --> patchness of soil moisture distribution --> patchness of A. ordosica population distribution --> patchness of A. ordosica biomass and density.
空间异质性影响着生态系统的功能和过程。本文运用统计和地统计学方法，探讨了毛乌素沙地半固定沙丘上油蒿的空间异质性与土壤水分之间的关系。结果表明，在样地尺度（80米×80米）上，油蒿生物量和密度的空间异质性依赖于土壤水分的空间异质性，尤其是生物量与土壤水分之间存在显著正相关，这表明在半固定沙丘上，土壤水分对植物种群的空间异质性起决定性作用。由于沙丘上降水的再分配，土壤水分与油蒿种群空间异质性之间相互作用的结果被认为是地形斑块化→土壤水分分布斑块化→油蒿种群分布斑块化→油蒿生物量和密度斑块化。
