牧场
草原
地理
植被(病理学)
植物群落
过度放牧
生态学
自然地理学
干旱
牧场管理
物种丰富度
环境科学
放牧
生物
病理
考古
医学
作者
Kohei Suzuki,Radnaakhand Tungalag,Amartuvshin Narantsetseg,Tsagaanbandi Tsendeekhuu,Masato Shinoda,Norikazu Yamanaka,Takashi Kamijo
出处
期刊:Journal of Plant Ecology
[Oxford University Press]
日期:2022-11-30
卷期号:16 (3)
被引量:1
摘要
Abstract In Mongolia, overgrazing and the resulting degradation of rangelands are recognized as serious issues. To address rangeland degradation, we sought to develop a broad-scale vegetation classification of Mongolian rangeland communities focusing on regional characteristics. Moreover, we sought to clarify the spatial distributions of communities and the environmental drivers of the distributions. Between 2012 and 2016, we surveyed vegetation in 278 plots (each 10 m × 10 m) in different regions of Mongolia (43–50° N, 87–119° E) in plots where grazing pressure is low relative to adjacent areas. The data were grouped into vegetation units using a modified two-way indicator species analysis (TWINSPAN). We then explored the regional characteristics of species compositions and community distributions, as well as relationships between distributions and climatic variables. The modified TWINSPAN classified the vegetation data into three cluster groups, each of which corresponds to a particular type of zonal vegetation (i.e. forest steppe, steppe and desert steppe). The aridity index was identified as an important driver of the distributions of all cluster groups, whereas longitude and elevation were important determinants of the distribution of clusters within cluster groups. Western regions, which are characterized by higher elevation and continentality compared with eastern regions, have lower mean temperature and precipitation during the wettest quarter, leading to differences in species composition within cluster groups. Regional differences in species composition reflect differences in phytogeographic origin. Thus, the framework of species composition and distributional patterns in Mongolian rangeland communities was demonstrated in relation to climatic and geographical factors.
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