Analysis of Grassland Vegetation of the Southwest Heilongjiang Steppe (China) Using the Power Law |
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作者姓名: | Mikinori TSUIKI Yu-Sheng WANG Yiruhan Michio TSUTSUMI Masae SHIYOMI |
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作者单位: | [1]Faculty of Agriculture, lwate University, Morioka 020-8550, Japan [2]National Northeast Agricultural University, Harbin 150030, China [3]Environmental Engineering Department, College of Science and Engineering, Jinan University, Guangzhou 510630, China [4]National Institute of Livestock and Grassland Science, Ecology Department, Tochigi 329-2724, Japan; [5]Faculty of Science, lbaraki University, Mito 310-8512, Japan |
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基金项目: | Supported by the National Natural Science Foundation of China (39270146 and 39370129) and the Ministry of Education of Japan(08640797). |
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摘 要: | 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.
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关 键 词: | 草原植被 黑龙江 西南地区 牧草质量 空间分布 |
收稿时间: | 2005-03-16 |
修稿时间: | 2005-03-162005-04-20 |
Analysis of Grassland Vegetation of the Southwest Heilongjiang Steppe (China) Using the Power Law |
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Authors: | Mikinori TSUIKI Yu-Sheng WANG Yiruhan Michio TSUTSUMI Masae SHIYOMI |
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Institution: | Faculty of Agriculture, Iwate University;, Morioka 020-8550, Japan; National Northeast Agricultural University;, Harbin 150030, China; Environmental Engineering Department, College of Science and Engineering, Jinan University;, Guangzhou 510630, China; National Institute of Livestock and Grassland Science, Ecology Department;, Tochigi 329-2724, Japan; Faculty of Science, Ibaraki University;, Mito 310-8512, Japan |
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Abstract: | 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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Keywords: | degradation grazing intensity Heilongjiang (China) spatial heterogeneity species diversity steppe Stipa baicalensis |
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