摘要
宁夏中东部地处黄土高原风沙区暖温性典型草原与荒漠草原的过渡地带。干旱多风的气候条件，含沙丰富的地表物质组成和超负荷的人为活动影响，使其成为宁夏土地沙漠化最严重的地区之一。草原沙漠化的植被演替阶段往往不易判别，我们有用数量分类中的聚类分析法成功地将其划分为两大类群，四个阶段。老瓜头（Ｃｙｎａｎｃｈｕｍｋｏｍａｒｏｖｉｉ），骆驼蒿（Ｐｅｇａｎｕｍｎｉｇｅｌｌａｓｔｒｕｍ）等植物在草原沙漠化演替的起始和发展阶段具指示意义。草原沙漠化的植被演替不同于撂荒地和沙地植被的演替，而且在积沙地其演替过程一般是不可逆的。
The middle east part of Ningxia Hui Autonomous Region is located in the transitionalzone between warm steppe and desert steppe on loess plateau,Under the influences of dry and windyclimate,loose sandy surface and improper economic activities of mankind,the area has become one ofthe most serious desertified land in Ningxia.Although the succession stage of desertified steppevegetation is often difficult to judge,we successfully distinguished the vegetation into two groups andfour phases by m eans of cluster analytical methcds. The vegeta tional succession of desertified steppewas different from those of sandy land vegetation and abandoned field vegetation. Cynanchum komaroviiand Peganum nigellastrum are indicator plants in the beginning and the development phases of desertifiedsteppe vegetational succession. The key step to turn the disertified vegetation into steppe vegetation is tostrictly control human activities.
出处
《中国沙漠》
CSCD
北大核心
1995年第1期54-59,共6页
Journal of Desert Research
关键词
草原
沙漠化
植被
Steppe desertification Vegetation succession
