[Niche characteristics of dominant populations of Sophora davidii community in loess gully region].
Based on field investigation data and employing Levin and niche proportional similarity formulae, this paper calculated the niche breadth, niche proportional similarity, and niche overlap of 13 dominant species of Sophora davidii community in loess gully region. The results showed that the niche breadth of the dominant populations of Sophora davidii community decreased in order of Sophora davidii (0.964), Artemisia giraldii (0.775), Arteniisia gmelinii (0.664), Thenmeda triandra var. japonica (0.508), Polygala tenuifolia (0.485), Setaria viridis (0.399), Cynodon dactylon (0.393), Bothriochloa ischaemum (0.327), Lespedeza davurica (0.321), Stipa bungeana (0.472), Periploca sepium (0.292), Clemnatis fruticosa (0.251), and Cleistogenes squarrosa (0.234). The niche proportional similarity between Sophora davidii and other species was 0.21-0.76, while the niche overlap was not high, which meant that there was no severe competition between them. It could be concluded that Sophora davidii was the dominant population in the community, with most resources utilization and most adaptability to the ecosystem.
Li
Dengwu
D
Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China. dengwuli@yahoo.com.cn
Zhang
Wenhui
W
Ren
Zhengzheng
Z
D002681:China; D003247:Conservation of Natural Resources; D017753:Ecosystem; D011157:Population Dynamics; D029909:Sophora / Q000254:growth & development*