黑河流域(张掖段)湿地植物群落优势种群生态位

Niches of Dominant Populations of Wetland Plants in Zhangye Section of Heihe River

对黑河流域湿地植物群落中优势种的生态位特征研究,结果表明:优势种为芦苇,亚优势种为滨麦、西藏嵩草;生态位宽度值依次为:芦苇>蒙山莴苣>滨麦>旋覆花>西藏嵩草>扁杆藨草>黄戴戴>鹅绒萎陵菜>长苞香蒲>藨草>节节草>小花棘豆>水麦冬>异穗苔草>假苇拂子茅>硬叶苔草>稗>垂穗披碱草>小香蒲>西伯利亚早熟禾>灰脉苔草。黑河流域湿地植物群落中物种对资源的利用相似程度比较高。从生态位重叠值来看,整体上表现为生态位宽度较大的物种间都有较高的生态位重叠。黑河流域优势种群在资源利用能力或环境的生态适应能力方面有较大的相似性;生态位重叠普遍;资源共享趋势明显。

A survey was conducted to study the niches of dominant populations of wetland plants in Hcihe fiver basin. Results show that the dominant species is Phragmites communis, and the subdominant species are Leymus mollis and Kobresia tibetica. The niche breadth of P. communis is the highest, followed by Lactuca tatarca, L mollis, Inula japonica, IC tibeti- ca, Scirpus plan/culmis, Halerpestes ruthenica, PotentiUa anserine, Typha angustata, Scirpus triqueter, Equisetum ramosis- simum, Oxytropis glabra, Triglochin palustre, Carex heterostachya, Calamagrostis pseudophragmites, Carex sutschanensis, Echinochloa crusgalli, Elymus nutans, Typha minima, Poa sibirica, and Carex appendiculata. There is a high degree of similarity in resource utilization between the wetland plant species in Heihe fiver basin. On the whole, those plant species with large niche breadth exhibit a high degree of niche overlap. The dominant species in Heihe fiver basin show a high de- gree of similarity in resource utilization ability or ecological adaptability. Niche overlaps are common, and the trend of re- source sharing among the dominant species is evident.