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放牧强度对羊草草地植被特征的影响 被引量:56

The effect of grazing intensity on vegetation characteristics in Leymus chinensis grassland
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摘要 通过小区控制放牧实验,研究了放牧强度对松嫩平原羊草草地植被特征的影响.结果表明:主要种群的高度、密度和生物量随季节的变化趋势不同,草地高度随放牧强度的增大而降低;一定程度的放牧可增加禾草在群落中的比例,提高牧草质量;随着放牧强度的增大,群落密度有增大的趋势,植物多样性指数先增高后降低,即中度放牧下多样性指数最大,有利于多样性的维持,多样性增加又能增强草地对放牧的缓冲力.植物种数与多样性指数间没有明显的线性关系. The effect of grazing intensity on vegetation character in Leymus chinensis grassland by grazing experiment was studied. The result showed that the tendency of height, density and biomass of main plant populations was different with the seasonal changes. The height of them decreased with the increase of grazing intensity. Moderate grazing intensity led the rate of grasses in community to increasing and raised the quality of herbage. There was a tendency in community density with the increase of grazing intensity. The index of diversity increased at beginning and then decreased with the increase of grazing intensity, that was to say, the index of diversity was highest under moderate grazing intensity and moderate grazing intensity benefited to maintenance of diversity, inversely, the increase of diversity also could strength tolerance against grazing. There was no significant linear correlation between number of species and index of diversity.
作者 刘颖 王德利 王旭 巴雷 孙伟 LIU Ying, WANG De li, WANG Xu, BA Lei, SUN Wei (National Laboratory of Grassland Ecological Engineering, Key Laboratory of Vegetation Ecology, Northeast Normal University, Changchun 130024, China)
出处 《草业学报》 CSCD 2002年第2期 22-28,共7页 Acta Prataculturae Sinica
基金 国家自然科学基金,教育部科学技术研究项目
关键词 放牧强度 羊草 草地 植被特征 grazing intensity Leymus chinensis grassland vegetation character
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