川西北高寒沙化草地修复过程中植物群落变化特征

Characteristics of Plant Community Changes during the Restoration of Alpine Desertified Grassland in Northwest Sichuan

草地沙化是我国严重的环境问题之一,目前关于草地沙化的研究主要集中于土壤养分和封育对植物的影响等方面,而对我国草地沙化过程中植物群落的变化关注和研究较少。通过实地调查,研究川西北高寒草地沙化过程中植物群落的变化特征。研究表明:(1)调查样地内共计有物种33种,隶属于17科29属;(2)随着修复年限的增加,物种丰富度指数也在增加,但物种多样性变化指数和物种均匀度指数随修复年限的增加先增加后下降;(3)TWINSPAN数量分类将若尔盖修复地植物群落划分为11种类型;(4)样点DCA排序的第一轴基本反映了修复年限的变化梯度,第二轴基本反映了海拔的变化。

Grassland desertification is one of the serious environmental problems in China,but the research on grassland desertification mainly focuses on the effects of soil nutrient and enclosure on plants,but there are few concerns and researches on the changes of plant communities in the process of grassland desertification in China.Through field investigations,studies were made of the variation characteristics of plant communities during the desertification process of alpine grassland in northwestern Sichuan.The researches have shown that:(1)There are 33 species in the survey plot,belonging to 17 families and 29 genera;(2)the species richness index is also increasing with the increase of the repair period,but the species diversity change index and species uniformity index increase first and then decreas with the increase of the repair period;(3)The TWINSPAN quantity classification divides the plant community of the Zoige restoration site into 11 types;(4)The first axis of the sample DCA ranking basically reflects the change gradient of the repair period,The two axes basically reflect the change in altitude.