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Yang L.-X.,Sichuan University | Li S.-C.,Sichuan University | Li S.-C.,Sichuan Lizi Bioenvironmental Engineering Co. | Li S.-C.,State Key Laboratory of Hydraulics and Mountain River Engineering | And 5 more authors.
Canadian Journal of Soil Science | Year: 2011

Soil erosion caused by increasing runoff and soil disturbances is a severe problem on steep rocky slopes. One possible soil erosion control measure is the application of polyacrylamide (PAM). Little is known about PAM application in the ecological recovery field, especially for steep rocky slopes. Our objective was to examine the ability of a range of anionic PAMs to control soil erosion on steep rocky slopes. Nine types of anionic PAMs were studied, which consisted of three molecular weights (MW) and three charge densities (CD) in a factorial design. The study was conducted using laboratory soil trays exposed to simulated rainfall. Three soils of different textures were treated with PAM using hydro-seeding technology with soil trays at a 60° slope. This work demonstrates that PAMs are effective at improving infiltration, thereby decreasing soil erosion. The PAMs that performed best for erosion control were the 14 Mg mol-1 MW and 30% CD for the loamy sand, the 10 Mg mol-1 MW and 20% CD for the silty loam, and the 6 Mg mol-1 MW and 30% CD for the silty clay. These results could assist ecologists in developing PAM application strategies to promote slope recovery. Source


Wei L.,Sichuan University | Li S.-C.,Sichuan University | Li S.-C.,Sichuan Lizi Bioenvironmental Engineering Co. | Sun H.-L.,State Key Laboratory of Hydraulics and Mountain River Engineering | And 4 more authors.
Chinese Journal of Ecology | Year: 2010

Vegetation restoration is a basic and strategic engineering measure for the re-construction of abandoned land and the prevention of soil erosion, while the dynamic characteristics of species diversity in the vegetation restoration can reflect the degree of vegetation recovery. By using closure and infiltration-storage-regulated supply (CSR) engineering as the applied restoration background, and with the geotechnical residue field of Jinping Hydropower Station as test object, the dynamic characteristics of vegetation communities in the field were studied through community investigation and diversity analysis. The plants selected at the early stage of vegetation recovery generally showed good adaptation to the environment, with legumes being the dominant in the community. The species of Gramineae, Compositae, and other perennial herbaceous plants increased gradually with time, and played important roles in maintaining community function. There was a close correlation between community dynamics and species diversity. With the process of succession, the community composition, diversity, and evenness increased, while ecological dominance decreased. Source


Long F.,Sichuan University | Sun H.-L.,State Key Laboratory of Hydraulics and Mountain River Engineering | Li S.-C.,Sichuan University | Li S.-C.,State Key Laboratory of Hydraulics and Mountain River Engineering | Li S.-C.,Sichuan Lizi Bioenvironmental Engineering Co.
Plant Biosystems | Year: 2011

Root anchorage adds stability to rocky slopes because the roots penetrate the shallow soil and extend into fractures in the bedrock. The influence of slope gradient on root anchorage has, however, rarely been investigated. Direct observation and pull-out tests in the field were used to investigate several root anchorage characteristics in 11-year-old Vitex negundo L. growing in three rocky slope conditions with varying gradients: low (29°), moderate (41°), and high gradient (53°). The results show that high- and moderate-gradient slopes in particular affect root anchorage resistance by increasing the tensile strength as well as the number and diameter of secondary upslope lateral roots that grow into the fractures. The upslope lateral roots contributed to anchorage to a greater extent than the downslope lateral roots. The contribution of upslope lateral roots to anchorage was 83% on high-gradient slopes, approximately 78% on moderate-gradient slopes, and 72% on lowgradient slopes. The conclusion of the study is that slope gradient is positively related to the distribution and anchorage of V. negundo L. on rocky slopes. © 2011 Società Botanica Italiana. Source

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