Analysis of Grassland Vegetation of the Southwest Heilongjiang Steppe (China) Using the Power Law

样方 草原 草原 放牧 横断面 地理 牲畜 植被(病理学) 草地退化 植物群落 空间异质性 生态学 物种多样性 林业 农林复合经营 环境科学 生物 物种丰富度 医学 病理
作者
Mikinori Tsuiki,Yusheng Wang,Yiruhan,Michio Tsutsumi,Masae Shiyomi
出处
期刊:Journal of Integrative Plant Biology [Wiley]
卷期号:47 (8): 917-926 被引量:17
标识
DOI:10.1111/j.1744-7909.2005.00121.x
摘要

Abstract: In 1997, we conducted a vegetation survey in three semi-arid natural grasslands (steppes) with different livestock grazing intensities in Southwest Heilongjiang Province, China. The dominant grassland species was the grass Stipa baicalensis Roshev. Grasslands with light, intermediate, and heavy grazing intensities were located 10, 5, and 2 km from a village, respectively. Villagers use the steppe to raise cattle, horses, sheep, and goats. Each of the three grasslands was surveyed by placing 100 quadrats (50 cm×50 cm) along a 50 m line transect. Each quadrat was divided into four equal areas (25 cm×25 cm; S-quadrats) and all plant species occurring in each of these smaller areas were identified and recorded. These data were summarized into frequency distributions and the percentage of S-quadrats containing a given species and the variance of each species were estimated. The power law was applied to these estimates. The power law was used to evaluate the spatial heterogeneity and frequency of occurrence for each species in the grassland community. The lightly grazed grassland exhibited high spatial heterogeneity (caused by large plant size), the highest species diversity, and a high occurrence of S. baicalensis. In contrast, the heavily grazed grassland exhibited high spatial heterogeneity (caused by patchy populations of small plant size), low species diversity, and a low occurrence of S. baicalensis. We judged that the heavily grazed grassland was overgrazed and exclusion of livestock from the degraded areas is necessary for recovery. (Managing editor: Ya-Qin HAN)
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