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| Effects of Slope on Soil Properties and the Interaction of Caragana tibetica Shrub Species in Loess Plateau of China |
| Fang Chao, Yuan Ziqiang, Liu Xuewei, Pei Jiuying, Zhao Dongmin, Ye Jiansheng |
| School of Life Sciences/Institute of Arid Agroecology/State Key Laboratory of Grassland Agro-ecosystem, Lanzhou University, Lanzhou 730000, China |
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Abstract 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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Received: 18 July 2014
Published: 20 November 2015
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2015, Vol. 35 
