摘要
生物多样性关系到生态系统的功能,而坡度和土壤因素是影响坡面产流产沙的重要因子。本研究基于黄土丘陵区生物多样性,并引入坡度、降雨前土壤含水量和土壤容重,探究其与坡面产流产沙总量的耦合关系。通过野外人工降雨试验,记录草本、灌木和乔木群落下的产流时间和产流产沙总量,并开展土壤植被调查。结果表明,与草本和乔木群落相比,灌木群落在延长产流开始时间和降低产沙总量上表现更优;植被群落功能离散度指数(FDiv)对产沙总量影响最大,Simpson指数(D)对产流总量影响最大,坡度仍然是不可忽视的第二重要影响因素;产流总量与坡度、土壤容重、D和功能丰富度指数(FRic)的回归关系优于产流总量分别与其的回归关系;产沙总量与坡度和FDiv指数的回归关系优于产沙总量分别与其的回归关系。植被保护与坡度改善将是该区水土保持规划工作的重点。
Biodiversity is related to the function of ecosystem,while slope and soil factors are the main factors influencing runoff-sediment yield.This study is based on biodiversity in Hilly area of Loess Plateau,and coupled with runoff and sediment yield by introducing three indicators:slope,soil water content before rainfall and soil bulk density before rainfall.Through artificial simulated rainfall tests in the field,the runoff start time and the runoff-sediment yield under three vegetation communities of the herbaceous communities,shrub communities and forest communities were recorded along with soil and vegetation surveys.The survey results show that compared with herbaceous communities and forest communities,shrub communities performed better in extending the runoff start time and reducing the total sediment yield.The functional dispersion index(FDiv)of vegetation community has the greatest influence on total sediment yield,the Simpson index(D)has the greatest influence on total runoff yield,and slope is still the second most important influencing factor that cannot be ignored.The regression relationship between the total runoff yield and slope,soil bulk density,D and functional richness index(FRic)was superior to that of relationships built using the above-mentioned parameters singly.The regression relationship between total sediment yield and slope and FDiv index was superior to that of relationships built using the above-mentioned parameters singly.Vegetation protection and slope improvement should beset as the focus of water and soil conservation planning in this area.
作者
文博瑾
段高辉
温仲明
WEN Bo-jin;DUAN Gao-hui;WEN Zhong-ming(The Research Center of Soil and Water Conservation and Ecological Environment,Chinese Academy of Sciences and Ministry of Education,Yangling,Shaanxi Province 712100,China;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi Province 712100,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Grassland Agriculture,Northwest Agriculture and Forestry University,Yangling,Shaanxi Province 712100,China)
出处
《草地学报》
CAS
CSCD
北大核心
2023年第4期1186-1197,共12页
Acta Agrestia Sinica
基金
国家自然科学基金(41977077)资助。
关键词
土壤侵蚀
土壤含水量
土壤容重
坡度
物种多样性
功能多样性
Soil erosion
Soil water content
Soil bulk density
Slope
Species diversity
Functional diversity
