研究了黄土高原半干旱丘陵地区西南坡向(158°~185°)两个坡度下藏锦鸡儿(Caragana tibetica)灌丛的肥岛效应以及与其他植物的相互作用。结果表明:在坡度为19°时,藏锦鸡儿灌丛斑块内除藏锦鸡儿之外的其他植物盖度是灌丛间地的2.1倍,土壤有机C、全N和全P含量略高于灌丛间,但无显著差异;在坡度为40°时,灌丛斑块内除藏锦鸡儿之外的植物盖度是灌丛间地的12.2倍,土壤有机C、全N含量均显著高于灌丛间地,分别高43.4%、38.1%,全P含量无显著差异。总盖度、藏锦鸡儿灌丛盖度、草本植物盖度,以及灌丛间地的非锦鸡儿植物盖度、土壤有机C、土壤N和全P含量在这两个坡度下均无显著差异。灌丛斑块非锦鸡儿植物盖度、土壤有机C、全N、全P含量在坡度40°下显著高于19°坡度。这表明在黄土高原半干旱区,随着坡度增大,灌丛的肥岛效应以及灌丛与其他植物的正相互作用有增强趋势。
The effects of fertile island of Caragana tibetica and the interaction between C. tibetica and other plant species were studied in Loess Plateau of China. The results showed that the value of other plant(non-C. tibetica) cover under the canopy of shrubs increased by 110%, but there were no significant differences in content of organic C, total N and total P between the soils under shrub canopies and in open spaces under slope of 19 and aspect of 158. Under the slope of 40 and aspect of 185, the concentrations of organic C, total N in the soils, and the values of other plant cover under the canopy of shrubs increased significantly by 43.4%, 38.1%, and 11.2 times, respectively, compared with those in the open spaces. However, there were no significant differences in the concentrations of organic C, total N and total P in the open space soils and the values of relative plant cover in the open spaces, total cover, C. tibetica shrub cover and grass cover between the two slopes. But the concentrations of organic C, total N and total P in soils, and the values of relative plant cover under the canopy of shrubs were significantly higher under the slope of 40 than those under the slope of 19. The results indicated that with the increasing of slope, there were stronger trends in the effects of fertile island of C. tibetica and the facilitation between C. tibetica and other plant species in the semiarid area in the Loess Plateau of China. And it offered a scientific basis for the vegetation restoration and reconstruction in Loess Plateau of China.
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