摘要
在山西省脱皮榆分布比较集中的霍山设置 4个样地 ,中条山设置 3个样地 ,采用样方法对脱皮榆种群进行调查 ,共作 5 85个样方 .将土壤含水量、土壤有机质含量和土壤全氮含量分别作为反映脱皮榆生长环境的资源轴 ,选择该区 2 2种灌木 ,5 3种草本 ,计测其在 3条资源轴上的资源选择性系数 L 、生态位宽度 B 、脱皮榆与其下灌木的生态位重叠 O .结果表明 :脱皮榆在 3条资源轴上生态位宽度值大小为 :B w >B n >B o ,其资源选择性系数则相反 ;连翘、3裂绣线菊在生态适应上与脱皮榆具有一致性 ;与脱皮榆生态位重叠值较大的连翘、虎榛子等是脱皮榆种群不同的生态种组 ;用土壤含水量。
The distributing center of Ulmus lamellosa on Huo mountain was set as four stands ,and Zhongtiao mountain was selected to set three stands. 585 plots were investigated by sampling method. Water, organic matter and nitrogen were used as the resource axis to reflect the growing environment of Ulmus lamellosa , 22 shrub species and 53 herbaceous species were selected to calculate the patchness index(L), niche breadth(B) and niche overlap(O) among Ulmus lamellosa , shrubs and herbaceous. The results show that the order of niche breadth of Ulmus lamellosa in the three resource axis is B(w)>B(n)>B(o), while the patchness index(L) is on the contrary; Forsythia suspensa, Spiraea trilobata are in accord with Ulmus lamellosa on the ecological adaptation ; The niche overlaps between Forsythia suspensa , Ostryopsis davidiana and Ulmus lamellosa are larger , Forsythia suspensa and Spiraea trilobata are regarded as the vary ecological groups.It is feasible to use the water, organic and nitrogen as resource axis to study niche breadth and niche overlap of Ulmus lamellosa .
出处
《西北植物学报》
CAS
CSCD
2003年第7期1266-1271,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
山西自然科学基金资助项目 2 0 0 2 10 98
山西省归国留学基金资助项目 2 0 0 2 -16
关键词
山西南部
脱皮榆
生态位宽度
生态位重叠
The south area of Shanxi
Ulmus lamellosa
niche breadth
niche overlap