贝加尔针茅＋线叶菊草地退化系列的定量划分和动态模型的建立  

Quantitative Classification of Degenerated Series of Stipa baicalensis+Filifolium sibiricum Steppe and Development of Dynamic Model

作　　者：郑淑华[1] 蔡瑞磊 赵萌莉[3] 韩国栋[3] 王堃[1] 

机构地区：[1]中国农业大学动物科技学院,北京100094 [2]德州富达玻璃钢制品有限公司,北京100089 [3]内蒙古农业大学生态环境学院,内蒙卉呼和浩特010019

出　　处：《干旱区研究》2008年第6期766-771,共6页Arid Zone Research

基　　金：内蒙古科学技术攻关项目(20030601);国家自然科学基金重点项目(30360022);内蒙古自然基金(2005040807)资助

摘　　要：对贝加尔针茅(Stipa baicalensis)+线叶菊(Filifolium sibiricum)草地中贝加尔针茅、麻花头(Serratula cen-tauroides)、日荫菅(Carexpediformis)和菊叶委陵菜(Potentilla tanacetifolia)4种主要植物的盖度、频度和植被指数进行了分析。结果表明:①通过SPSS的聚类分析,实验区草地可以划分为3个草地退化系列,即轻度退化、中度退化、重度退化;②随草地退化程度的增强,贝加尔针茅的盖度、频度和指数表现出降低的趋势,麻花头与日荫菅的盖度、频度和植被指数表现出先增加后降低的趋势,而菊叶委陵菜盖度、频度和植被指数则表现出增加的趋势;③轻度退化、中度退化、重度退化3个不同退化系列的草地变化可通过Y1=0.020 5X1+0.003 9X2-0.003 2X3+0.003 9X4-47.245 6;Y2=0.005 4X1+0.005 2X2-0.003 4X3+0.011 9X4-16.734 1;Y3=0.002 2X1+0.003 5X2-0.001 6X3+0.004 6X4-3.854 8(其中,Y表示最终的变化值,X1,X2,X3,X4分别表示草地最优状态时贝加尔针茅、麻花头、日荫菅和菊叶委陵菜4种植物的指数)来反映。In this paper, the coverage, frequency and index of 4 main plant species, i. e. , Stipa baicalensis, Serratula centauroides, Carex pediformis and Potentilla tenacetifolia in Stipa baicalensis ＋ Filifolium sibiricum steppes are analyzed. The results are as follows： （ 1 ） After carrying out the clustering analysis in SPSS method, the degeneration of step . sin the study area can be divided into 3 stages, i.e. slight degeneration stage, moderate degeneration stage and serious degeneration stage; （2） With the development of steppe degeneration, the coverage, frequency and index of Stipa baicalensis are decreased, that of Serratula centauroides and Carex pediform are increased at first and then decreased, that of Potentilla tenacetifolia are increased; （3） The change of steppes at the different degeneration stages can be expressed by： Y1 = 0. 020 5X1 ＋ 0. 003 9X2 - 0. 003 2X3 ＋ 0. 003 9X4 - 47. 245 6 （slight degeneration stage）;Y2 = 0. 005 4X1 ＋ 0. 005 2X2 - 0. 003 4X3 ＋ 0. 0119X4 - 16. 734 1 （ moderate degeneration stage） ;and Y3 = 0. 002 2X1 ＋ 0. 003 5X2 - 0. 001 6X3 ＋ 0. 004 6X4 - 3. 854 8 （ serious degeneration stage） , respectively. Where, Y is the final change value, and Xi, X2, X3 and X4 are the indexes of Stipa baicalensis, Serratula centauroides, Carex pediformis and Potentilla tenacetifolia respectively.

关 键 词：贝加尔针茅+线叶菊 草地退化 退化系列 退化阶段 动态模型 内蒙古 

分 类 号：S812[农业科学—草业科学]