阜康荒漠植被灌木与半灌木种群生态位的研究

 通过测算三维生态因子梯度上阜康荒漠植被灌木与半灌木种群的生态位宽度和生态位重叠，结果表明；阜康荒漠植被灌木、半灌木按生态位宽度可分成4类，类群Ⅰ包括红砂(Reaumuria soongorica)和梭梭(Haloxylon ammodendron)；类群Ⅱ包括白刺(Nitraria sibirica)、盐爪爪(Kalidium foliatum)、囊果碱蓬(Suaeda physophora)、里海盐爪爪(K．caspicum)；类群Ⅲ包括多枝柽柳(Tamarix ramosissima)、长穗柽柳(T．elongata)、短穗柽柳(T．laxa)和无叶假木贼(Anabasis aphylla)；类群Ⅳ包括黑果枸杞(Lycium ruthenicum)、粗枝猪毛菜(Salsola subcrassa)和盐节木(Halocnemum strobilaceum)。根据生态位重叠矩阵，红砂和梭梭间生态位重叠较大；盐爪爪、囊果碱蓬、里海盐爪爪、多枝柽柳、长穗柽柳间重叠较大；白刺、短穗柽柳、无叶假木贼、黑果枸杞、粗枝猪毛菜和盐节木与其它种的重叠值均较小。

SHRUB AND UNDERSHRUB NICHES IN VEGETATION OF THE FUKANG DESERT

Calculation of niche breadth and overlap of shrubs and undershrubs on three environmental gradients in Fukang desert vegetation shows that shrubs and undershrubs in Fukang can be divided into four groups based on niche breadth.Group 1: Reaumuria soongorica and Haloxylon ammodendron, Group 2: Nitraria sibirica,Kalidium foliatum,Suaeda physophora, and K. caspicum, Group 3: Tamarix ramosissima, T. elongata, T. laxa, and Anabasis aphylla ,Group 4: Lycium ruthenicum,Salsola subcrassa,and Halocnemum strobilaceum. Based on the niche overlaps matrix, overlap between R. soongorica and Haloxylon ammodendron is the largest,while overlaps among K. foliatum,Suaeda physophora,K. caspicum,T. ramosissima,T.elogata are also large and those of other species are smaller.