喀斯特山地草地植物群落物种数量特征及多样性分析

选择贵州典型喀斯特山地草地植物群落为研究对象,采用标准样地调查法,对不同海拔、坡向的植物群落数量特征、物种特性、以及物种丰富度、多样性、均匀性等特征展开研究,结果表明,（1）喀斯特山地草地植物群落密度随海拔升高呈显著增加趋势（F=20.600;P≤0.01）。植物群落中矛叶荩草（Arthraxon lanceolatus）和扭黄茅（Heteropogon contortus）种群在数量上占优势,同时矛叶荩草和扭黄茅种群密度随海拔升高呈现出增加趋势;但矛叶荩草种群密度在群落中的比例呈现出下降趋势,而扭黄茅种群密度在群落中的比例呈现出升高趋势。（2）喀斯特山地草地植物群落以禾本科（Gramineae）、菊科（Compositae）、蔷薇科（Rosaceae）、唇形科（Labiatae）为主;其中禾本科植物种类比例随海拔升高呈现出下降趋势,而菊科、蔷薇科、唇形科植物种类比例呈现出升高趋势。（3）喀斯特山地草地植物群落丰富度指数随海拔升高呈现出增加趋势,Simpson多样性指数、Shannon-Wiener多样性指数随海拔升高呈现先降后升趋势,Peilow均匀性指数随海拔升高呈现下降趋势。

The plant community species quantity trait and diversity analysis of the Karst mountain grassland

This study was conducted to investigate the community of the typical Karst mountain grassland community in Guizlaou Province, which is contrary to quantitative characteristics of community, species traits, and Species richness, diversity index, evenness index trait in different altitudes and slopes using a standard plot survey way. The results show that： （l） The grassland plant community density increases significantly from lower to higher altitude in karst mountain （ F=20.600; P≤0.01 ） . Heteropogon contortus （Poaceae） and Arthraxon lanceolatus （Poaceae） are dominated in quantity in the grassland community, and the population density of them show a trend of rising with the increasing of the altitude; however, the proportion density rate of tteteropogon contortus （Poaceae） in the grassland vegetation community show a decreasing trend while Arthraxon lanceolatus （Poaccae） （m the con- trary. （2） The grassland community in the karst mountain is determined by Gramineae, Compositae, Rosaceae, and Labiatae. The rate of Gramineae is increasing with the altitude upward while the other three on the contrary. （3）By analyzing the richness index or＂ the grassland community increase gradually from lower to higher altitude in karst mountain. Besides, Peilow evenness index increase gradually and Simpson, Shannon-Wiener diversity index decrease first and then ascend.