摘要
为了解河西走廊人工梭梭林草本层物种间的生态特征及其群落稳定性,为河西走廊人工梭梭林群落保护和恢复提供理论依据。在群落调查的基础上,运用重要值、Levins生态位宽度、Pianka生态位重叠、生态位相似性比例及M.Codron稳定性指标,系统分析了河西走廊沙地人工梭梭林草本植物种群生态位特征和群落稳定性。结果表明:(1)在人工梭梭林草本植物群落中,共统计到14种草本植物,隶属4科12属,雾冰藜(Bassia dasyphylla)的重要值和出现的频度较其他物种更高,为群落优势种。(2)在河西走廊人工梭梭林草本层植物中,雾冰藜占据着最大的生态位宽度(0.8616),表明其具有广泛的生态适应性并在草本群落中发挥关键作用。(3)物种生态位重叠值在0~0.4的物种有33对,占物种总对数的36.26%,物种生态位重叠值为0的物种有39对,占物种总对数的42.86%;物种间的生态位重叠和生态位相似性比例普遍较低,生态位分化明显,各物种对生境资源的需求存在较大差异,种间竞争较弱。(4)草本层种群的稳定性接近20/80,处于较稳定状态。研究认为,雾冰藜在整个群落中明显占有优势地位,具有较强的竞争优势,但群落内部生态位分化程度明显,物种间竞争较弱,群落结构较稳定。
In order to understand the ecological characteristics and community stability of the herbaceous layer of artificial Haloxylon ammodendron forest in Hexi Corridor,and provide a theoretical basis for the protection and restoration of the artificial Haloxylon ammodendron forest community in Hexi Corridor,on the basis of the community survey,the ecological niche characteristics and community stability of herbaceous plant populations in the community were studied by indicators such as species importance value,Levins niche breadth,Pianka niche overlap,niche similarity index and M.Codron stability.The results showed that:(1)In the herbaceous plant community of artificial Haloxylon ammodendron forest,there were 14 species of herbaceous plants belonging to 4 families and 12 genera,and Bassia dasyphylla had a higher importance value and frequency than the other species,and was the dominant species in the community.(2)Among the herbaceous layer plants of artificial Haloxylon ammodendron forest in Hexi Corridor,Bassia dasyphylla occupied the largest niche breadth(0.8616),indicating that its ecological adaptive range was broader and it played an important role in the herbaceous plant population.(3)There were 33 pairs of species with a niche overlap value of 0 to 0.4,accounting for 36.26%of the total number of species pairs,and 39 pairs of species with a niche overlap value of 0,accounting for 42.86%of the total number of species pairs.The niche overlap and niche similarity ratios between species were generally low,niche differentiation was obvious,there were large differences in the demand for habitat resources among species,and interspecific competition was weak.(4)The stability of the herbaceous layer population was close to 20/80,which was in a relatively stable state.The study showed that Bassia dasyphylla occupied a dominant position in the entire community and had a strong competitive advantage,but the degree of niche differentiation within the community was obvious,the competition between species was weaker,and the community structure was more stable.
作者
苏付荣
占玉芳
鲁延芳
何靖
李红菊
SU Fu-rong;ZHAN Yu-fang;LU Yan-fang;HE Jing;LI Hong-ju(Zhangye Academy of Forestry,Zhangye 734000,China)
出处
《江西农业学报》
2025年第6期24-31,共8页
Acta Agriculturae Jiangxi
基金
国家自然科学基金项目(31560240)
甘肃省自然科学基金项目(25JRRG042)
甘肃省林业和草原局科技计划项目(2022kj008)。
关键词
人工梭梭林
草本层
生态位特征
群落稳定性
河西走廊沙地
Artificial Haloxylon ammodendron plantation
Herbaceous layer
Niche characteristics
Community stability
Hexi Corridor sandy land
