An analysis of moisture niche-fitness of artificial sand-fixing plants and its application in arid regions
文献类型: 会议论文
第一作者: LI Wenlong
作者: LI Wenlong 1 ; LI Zizhen; Chinese Society for Grassland Science; Lanzhou University; Gansu Grassland Ecological Research Institute(GGERI)(CN);;
作者机构: 1.College of Pastoral Agriculture Science and Technology, Lanzhou University
关键词: arid region;sand-fixing plant;soil moisture;moisture niche-fitness degree
会议名称: Acta Prataculturae Sinica vol.15 Suppl. July 2006:Grassland Agriculture:Balancing Production and Environmental Protection
主办单位:
页码: 223-226
摘要: This study focused on the artificial sand fixing plants in a typical northwest china arid region (Shapotou Area). The regularity and distribution of the limited precipitation in space and time and the constraining relationship between precipitation and water consumption of sand fixing plants were researched. The definition of classical niche theory was expended by us using abstract mathematics so that the mathematical model defined the moisture niche-fitness degree of plant moisture as the closeness between the optimal moisture niche and the actual water resource a-vailable. The niche-fitness degree of sand fixing plants was quantitatively analyzed. It indicated that the niche-fitness degree and the percentage of coverage of vegetation would reach the maximum value when interplanting Caragana korshinskii (C. K. ) and Artemisia ordosica (A. O. ) with 5000 plants per hectare in this experiment, and this provided a quantitative basis for artificial planting in arid regions. The competition between Caragana korshinskii (C. K. ) and Artemisia ordosica (A. O. ) for moisture when constrained by limited precipitation and waned of soil in sand land are discussed. At same time, the variation of niche-fitness degree in mixed planting and the mechanism of generating a stable co-existence pattern were studied. The results of our research provide the quantificational guidelines for establishing artificial forest plants in arid regions.
分类号: S812
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