Determining the optimal vegetation coverage for controlling soil erosion in Cynodon dactylon grassland in North China

JOURNAL OF CLEANER PRODUCTION

卷:244

Article

Hou, Guirong^1,4  Bi, Huaxing^1,2,3,4,5,6  Huo, Yunmei⁷  Wei, Xiaoyan⁸  Zhu, Yongjie⁹  Wang, Xiaoxian¹  Liao, Wenchao¹⁰ 

[1] Beijing Forestry Univ, Coll Soil & Water Conservat, Beijing 100083, Peoples R China

[2] Natl Observat & Res Stn, Forest Ecosyst Studies, Jixian 042200, Shanxi, Peoples R China

[3] Beijing Collaborat Innovat Ctr Ecoenvironm Improv, Beijing, Peoples R China

[4] Beijing Forestry Univ, Key Lab State Forestry Adm Soil & Water Conservat, Beijing 100083, Peoples R China

[5] Beijing Forestry Univ, Beijing Engn Res Ctr Soil & Water Conservat, Beijing 100083, Peoples R China

[6] Beijing Forestry Univ, Minist Educ, Engn Res Ctr Forestry Ecol Engn, Beijing 100083, Peoples R China

[7] Management Comm Beijing Yanqi Lake Ecol Demonstra, Beijing 101400, Peoples R China

[8] Water & Soil Conservat Monitoring Stn Ningxia, Yinchuang 750000, Peoples R China

[9] Shanghai Invest Design & Res Inst Co Ltd, Shanghai 200434, Peoples R China

[10] Beijing Water Consulting Co LTD, Beijing 100048, Peoples R China

关键词: Soil erosion;    Simulated rainfall;    Structural equation model;    Response surface methodology;    Optimal vegetation coverage;   

DOI  :  10.1016/j.jclepro.2019.118771

来源: Elsevier

【 摘 要 】

Soil erosion has been a widely studied hydrological issue, and the further deterioration of soil and water environments caused by soil erosion has attracted extensive attention from global scholars. At present, there are relatively few studies on preventing and controlling soil erosion to avoid the introduction of pollutants from surface runoff in grasslands during rainfall events. To identify the optimal vegetation coverage of Cynodon dactylon grassland for controlling soil erosion during rainfall events, bare land (0%) was used as the control in this experiment. Simulated rainfall experiments were carried out with three levels of coverage (30%, 60% and 90%) under four slope conditions (0 degrees, 5 degrees, 10 degrees and 20 degrees) and four rainfall intensities (20 mm/h, 30 mm/h, 60 mm/h and 90 mm/h). The results suggested that the capacity of Cynodon dactylon grassland to reduce the runoff coefficient and sediment yield decreased with increasing rainfall intensity and slope but increased with increasing vegetation coverage. The results of the structural equation model revealed close relationships between vegetation coverage and the reduction rate of the runoff coefficient and the reduction rate of the sediment yield. The results of the response surface methodology suggested that the vegetation coverage of Cynodon dactylon grassland should be higher than 86% to ensure that the reduction rate of the runoff and sediment of grassland is greater than 60%, and it is advisable that the planting slope of grassland not exceed 10 degrees. The results of this study serve as a guide for the recovery and restoration of grasslands to control soil erosion and prevent the production as well as further spreading of pollutants in China. This study highlights the need to consider the prevention and control of soil erosion as a source of pollutants. (C) 2019 Elsevier Ltd. All rights reserved.

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