宁夏盐池荒漠化草原人工封育区生态位研究

运用Levins生态宽度指数及Pianka生态位重叠指数对宁夏盐池荒漠草原人工封育区2002年及2003年生态位宽度及生态位重叠进行计量。结果表明:2002年封育区茵陈蒿、狗尾草生态位宽度值最大,分别为0.758、0.505,是02年封育区的优势种;03年封育区的优势种是茵陈蒿、狗尾草、老瓜头、苦豆子,其生态位宽度值分别为0.868、0.567、0.563、0.552。最大生态位重叠值02年与03年均未出现在优势种之间,02年出现在赖草与叉枝鸦葱、新疆猪毛菜与志远之间;03年出现在沙珍棘豆与中亚虫实、沙珍棘豆与狭叶米口袋、中亚虫实与狭叶米口袋之间。

The Study on Niche in Desert Grassland Region Fenced in Yanchi County, Ningxia Hui Autonomous Rgeion

The niche breadth and niche overlapping in desertgrassland region fenced in Yanchi County,Ningxia Hui Autonomous Region were measured in 2002 and 2003 by mean of using Levins(1968) niche breadth and Pianka niche overlapping indexes.The resultsshowed as follow: the niche breadth of Artemisia capillaries and Setaria viridis were bigger than other speciesin the region in 2002.In 2003,the dominant species were Artemisia capillaries,Setaria viridisand Cynanchum komaroviietc..Theirniche breadth indexes were 0.868,0.567,and 0.563 respectively.The biggestniche overlapping did not appear amongdominant species.In 2002,the biggest niche overlapping appeared amongL.secalinusand Scorzonera divaricata,Salsola sinkiangensis A.J.Li and Polygala tenuiplia.In 2003,the biggest niche overlapping appeared among Oxytropis pasmmocharisand Corispermum heptapotamicum Iljin,Oxytropis pasmmocharis and Gueldenstaedtia stenophyllaBge etc..