摘要
以青海省玛多县重点保护植物梭罗以礼草(Kengyilia thoroldiana)为研究对象,通过χ2检验、相关分析、生态位宽度及生态位重叠等方法对12种常见物种、66个种对在6个土壤因子梯度下的生态位和种间关联性等进行研究。结果表明,1)群落常见物种总体表现为不显著负关联,彼此独立。χ2检验、Pearson积矩相关系数检验和Spearman秩相关系数检验的正负关联比(分别为1.06、1.10和0.97)处于1左右,群落可能正处于植被演替进程中一个相对稳定的过渡阶段。2)梭罗以礼草与其他常见植物均未出现显著关系,Spearman秩相关系数表明与早熟禾(Poa annua)等5种植物有正关联,与火绒草(Leontopodium leontopodioides)等6种植物有负关联。3)梭罗以礼草在6个土壤因子梯度下均表现出较高的生态位宽度和生态位重叠,具有较强生态适应能力及竞争优势。4)在66个种对中,正关联较大的种对在每个因子梯度上均表现出相对较高的生态位重叠;负关联较大的种对仅在某几个因子梯度上表现出相对较高的生态位重叠,且整体上重叠程度不如正关联。今后对梭罗以礼草种群应当减少人为破坏,保证该群落自然演替的进程,保证梭罗以礼草种质资源的可持续性。
The soil concentration gradients of 12 common plant species and 66 species pairs from Maduo County,Qinghai Province were determined usingχ2 tests,correlation analysis,niche breadths,and niche overlaps in order investigate the correlations between niches and species and to further our understanding of the ecology of the rare Kengyilia thoroldiana plant.The results showed that:1)The common characteristics of common species in the community were not significantly negatively correlated and were independent of each other.The positive-negative correlation ratios found in theχ2 test,Pearson’s correlation coefficient test,and Spearman’s rank correlation coefficient test(1.06,1.10,and 0.97,respectively)were roughly equal to one.Therefore,the community may be in a relatively stable transitional stage in terms of vegetation succession.2)There were no significant relationships between K.thoroldiana and other common plants.The Spearman’s rank correlation coefficients showed insignificant positive correlations with five plants,such as Poa annua,and insignificant negative correlations with six plants,such as Leontopodium leontopodioides.3)K.thoroldiana showed wide niche breadth and large niche overlap under the six soil factor gradients,and had strong ecological adaptability and a competitive advantage.4)Among the 66 species pairs,the pairs with stronger positive correlations showed relatively large niche overlap in every soil factor gradient.Nevertheless,the pairs with stronger negative correlations showed niche overlap only in certain soil factor gradients and did not possess as strong positive correlations in terms of overall overlap.In the future,human damage to K.thoroldiana populations should be reduced in order to ensure the natural succession of the community and to ensure the sustainability of the genus’germplasm resources.
作者
张静
才文代吉
索南才仁
温小成
王生彩
杨毛吉
仁增欧珠
孙海群
ZHANG Jing;Caiwendaiji;Suonancairen;WEN Xiaocheng;WANG Shengcai;YANG Maoji;Renzengouzhu;SUN Haiqun(College of Agriculture and Animal Husbandry,Qinghai University,Xining 810016,Qinghai,China)
出处
《草业科学》
CAS
CSCD
2019年第11期2752-2765,共14页
Pratacultural Science
基金
青海省科技计划(2017-ZJ-728)
国家自然科学基金(31560668)
关键词
梭罗以礼草
种间关联
生态位宽度
生态位重叠
Kengyilia thoroldiana
interspecific associations
niche breadth
niche overlap
