Liu Y.,Beijing Forestry University |
Rauch H.P.,University of Natural Resources and Life Sciences, Vienna |
Zhang J.,Guangzhou Hydraulic Research Institute |
Yang X.,Chinese Academy of Forestry |
Gao J.,Beijing Forestry University
Ecological Engineering | Year: 2014
It is important to select the appropriate plants for soil bioengineering by taking their development and the root anchorage into consideration. The aims of the study were to evaluate the survival rate and anchorage capability of five species planted as cuttings and to further investigate the interrelationship of pull out force and plant morphology. Above 90% of Salix matsudana cv. Umbraculifera, Populus canadensis Moench, Salix alba var.Tristis and Salix purpurea cuttings survived. Less than 30% of Amorpha fruticosa L. survived. The highest number of roots had developed in the 30-40. cm stem section in the deepest layer of soil.A total of 77 cuttings were vertically pulled out and the morphological characteristics of their root structure were measured. Cuttings of S. matsudana cv. Umbraculifera showed the greatest uprooting resistance (1214.8N), followed by A. fruticosa L. (1043.9N), P. canadensis Moench (879.7N), S. purpurea (802.9N) and S. alba var. Tristis (765.2N). Uprooting resistance was effected mostly by the roots than by the shoot profiles. The pull out resistance force (Fmax) has shown the best relationships with multiple morphological parameters as total number of roots combined with root dry mass (P<0.0001). The species with the highest capability suitable for purposes of soil bioengineering should be S. matsudana cv. Umbraculifera, P. canadensis Moench, S. purpurea and S. alba var. Tristis. A. fruticosa L. is not suitable for being used in soil bioengineering techniques due to its low level of survival rate. © 2014 Elsevier B.V.
Zhong Z.,Guangzhou Hydraulic Research Institute |
Zhang M.,Guangzhou Hydraulic Research Institute |
Meng Q.,Guangzhou Hydraulic Research Institute |
Yu F.,Guangzhou Hydraulic Research Institute
Chinese Journal of Environmental Engineering | Year: 2014
The effect of submerged aquatic-vegetation based restoration on water quality of Baiyun Lake Ecological Demonstration Area, which was the largest landscape artificial lake of water supplement purpose in Guangzhou City, was evaluated by using comprehensive pollution index. Results showed that, as the development of submerged vegetation, the water quality was improved from grades V or worse than grades V to grades III or IV of state water quality standards for surface water, and the comprehensive pollution status changed from serious pollution to mild pollution. In addition, factor analysis was used to investigate the relationship between water quality and ecological factors. Ten water quality indicators were classified into four categories to reflect the water quality. The first factor contained the information of nutrient index. The second factor provided the information of organic pollution. The third factor was mainly about influence of temperature on water quality. And the forth factor was related with pH value. The comprehensive score based on factor analysis was greatly reduced after the ecology system was set up. And the monthly score throughout the year manifested as the higher temperature, the better water quality, which may be a trend towards a macrophytic lake. In summary, aquatic ecosystem reconstruction can improve the water quality of demonstration area significantly, and may be a feasible solution to ensure the safety of urban river water supplement.