川西北高寒草地沙化进程中植被特征研究——以理塘县为例  

The Changes of Soil Physical Properties of Alpine Grassland Desertification Process in Northwest Sichuan——Taking Litang County as an Example

作　　者：刘朔[1] 费东[1] 蔡凡隆[1] 

机构地区：[1]四川林业调查规划院,四川成都610081

出　　处：《四川林业科技》2017年第2期31-35,共5页Journal of Sichuan Forestry Science and Technology

基　　金：基金项目:川西北防沙治沙应用技术研究及示范(2008SZ0149)

摘　　要：以理塘县高寒草地为研究对象,采用空间序列代替时间序列的研究方法对该区不同沙化类型草地的植被特征进行分析,结果表明:(1)川西北高原沙化草地上常见植物30科89属174种。包括灌木6科8属15种;草本24科81属159种。(2)随着沙化程度的加重,各类沙化土地的植物盖度和生物量(总生物量、地上和地下部分生物量)均呈现出规律性变化,表现为非沙地(对照)>轻度沙地>中度沙地>重度沙地>极重度沙地;(3)植物种类数量为中度沙地>重度沙地>轻度沙地>非沙地(对照)>极重度沙地;(4)群落优势种数量为中度沙地>重度沙地>轻度沙地>非沙地(对照)>极重度沙地(无明显优势种)。In this paper, alpine grassland in Litang County was regarded as the research object, analysis was made of vegetation characteristics of different types of grassland in this area by using the method of the space sequence research instead of time series. The results showed that there were 30 families,89 gen- era and 174 species of common plants in the sandy grassland in the northwest of Sichuan Province inclu- ding 6 families, 8 genera, 15 species of shrubs, and 24 families, 81 genera, 159 species of herbaceous plants. Besides, the coverage and biomass （ total biomass, aboveground and underground biomass） of all kinds of sandy land showed regular changes with the aggravation of the degree of desertification. The change sequence of the coverage rate from high to low was non sandy land （control） , mild sandy land, moderate sandy land, severe sandy land, extremely heavy sandy land. Thirdly, the number sequence of plant species was moderate sandy land , severe sandy land, mild sandy land, non sandy land （control） , extremely heavy sandy land. Lastly, the sequence of community dominant species number was moderate sandy land, severe sandy land, mild sandy land, non sandy land （control）, extremely heavy sandy land without obvious dominant species.

关 键 词：川西北 高寒草地 沙化 植被特征 

分 类 号：S812[农业科学—草业科学]