School of Soil and Water Conservation, Beijing Forestry University, 100083 Beijing, China; Forest Ecosystem Studies, National Observation and Research Station, Jixian, Shanxi, China.
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Sci Total Environ. 2020 Apr 15;713:136705. doi: 10.1016/j.scitotenv.2020.136705. Epub 2020 Jan 15.
Research on sustainable use of water resources is needed to ensure food security, limit erosion, and prevent land degradation. Owing to the importance of water conservation to ecosystems, further research on the water conservation functions of different ecosystems is needed. Given the influence on water conservation functions, it is critical to identify environmental factors mediating slope runoff. In this study, the focal study area was the Yangjuangou catchment (36°42' N, 109°31' E) of the Loess Plateau in Shaanxi Province, China. Using a trait-based approach, a quantitative analysis was conducted to research effects of the functional structure parameters of plant communities on runoff of grass slopes for different periods of the year under differing rainfall intensity conditions. Results show that in mid-June, which represents the start of the growing season, effects of root traits on slope runoff decrease with increasing rainfall intensity. Slope runoff was found to be mainly affected by various plant functional traits in late July and aboveground parts of plants in early September. Given that few studies have focused on runoff processes using a trait-based approach at the community scale, this research can serve as a new reference for investigating the relationship between slope runoff and vegetation.
需要对水资源的可持续利用进行研究，以确保粮食安全、限制侵蚀和防止土地退化。由于保护生态系统的水资源对生态系统很重要，因此需要进一步研究不同生态系统的水资源保护功能。鉴于环境因素对水资源保护功能的影响，确定调节坡面径流的环境因素至关重要。本研究以陕西省黄土高原羊咀沟流域（36°42'N，109°31'E）为研究区，采用基于特征的方法，对不同降雨强度条件下不同时期草地坡面径流量与植物群落功能结构参数的关系进行了定量分析。结果表明，在 6 月中旬，即生长季开始时，根特征对坡面径流的影响随着降雨强度的增加而减小。7 月底，坡面径流主要受植物各功能性状的影响，9 月初主要受植物地上部分的影响。由于很少有研究在群落尺度上采用基于特征的方法研究径流过程，因此本研究可为研究坡面径流与植被之间的关系提供新的参考。
