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| Ecological adaptability of plants in beginning period of slope protection by cast-in-situ grids |
| Mei Xuemei1, Gao Jiarong 1, Ma Lan1, Wang Jianjun3, Wang Bing1, Guo Kaili1, Zhang Dong1, Chen Qiong1 |
| 1. School of Soil and Water Conservation,Beijing Forestry University,100083,Beijing, China; 2. Inner Mongolia Hexinyuan Ecological Engineering R & D Center,010000,Hohhot, China; 3. Beijing World Hazard Preventing Technology Co. , Ltd. , 100048, Beijing, China |
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Abstract Slope protection by cast-in-situ grids is a technique using reinforced concrete grids with shrub or grass to get the structures with some engineering and ecological functions, which contributes to stabilizing slope. In the Inner Mongolia Autonomous Region in China, a road slope in the Qianlishan Road by cast-in-situ grids was selected to determine ecological adaptability of different plants in the beginning period of the protection by cast-in-situ grids. Four bush plant species planted in the cast-in-situ grids were taken as the research object to analyze the ecological adaptability. The main characteristics of these plants were investigated in the first and fourth month and the second year after construction of cast-in-situ grids, including preserving rate, height, collar diameter, biomass of branch, crown width, underground biomass and aboveground biomass of plants, based on which their ecological adaptability was analyzed by principal component analysis method. The results showed that preserving rate of Lespedeza bicolor Turcz tended to remain stable, while those of other plant species decreased from the first to fourth month after construction of cast-in-situ grids. But preserving rate of the four bush plant species tended to remain stable in the second year after construction, and the order of preserving rate from high to low was: L. bicolor (92%) > Caryopteris clandonensis‘Worcester Gold’(85%) > Hedysarum mongolicum Turez (75%) > Tamarix chinensis Lour (73%). In addition, the four bush plant species had obviously fast growth speed, although the growth indexes increment of different local plants were significantly different during the research period. And the growth rate of growth indexes of Lespedeza bicolor and C. clandonensis ‘Worcester Gold爷was higher than those of H. mongolicum and T. chinensis. On the whole, compared with the other bush plant species, L. bicolor grew best. A significant positive correlation could be found between collar diameter and underground biomass, aboveground biomass, and the correlation coefficients were 0.915 and 0.999 respectively. Meanwhile there existed a significant positive correlation between underground biomass and aboveground biomass, with the correlation coefficients of 0.901. However, there was no significant correlation among other growth indexes. The principal component analysis indicated that the order of ecological adaptability in the beginning period of the protection by cast-in-situ grids from high to low was: L. bicolor > C. clandonensis ‘ Worcester Gold爷> H. mongolicum > T. chinensis. Thus, L. bicolor is most suitable to grow in the technique of slope protection by cast-in-situ grids in cold and dry area of Inner Mongolia Autonomous Region. The results provide a reference for vegetation construction on road slope in cold and dry areas and extension of slope protection technology by cast-in-situ grids.
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Received: 13 January 2015
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