本文選題：根長密度 + 根體積密度　； 參考：《水土保持學報》2017年06期

【摘要】：以黃土丘陵區(qū)4種典型植物種群(狼牙刺、白羊草、鐵桿蒿、達烏里胡枝子)為研究對象,采用野外采樣、室內模擬試驗與分析相結合的方法,對0—30cm土層的各徑級根系密度參數(shù)(根長密度、根體積密度、根表面積密度)與土壤理化性質、土壤分離速率間的關系進行了研究。結果表明:(1)4種植物的根系徑級主要集中在0D≤1.0mm之間,86%~93%的根長和46%~61%的根表面積分布在此范圍內,且根系徑級越大,根系各密度參數(shù)越小;(2)4種植物各徑級根密度參數(shù)對土壤理化性質(容重、有機質、團聚體)的影響各不相同;狼牙刺根系直徑為0D≤1.0mm的根密度參數(shù)與土壤容重、有機質含量呈極顯著相關;鐵桿蒿在0D≤1.0mm徑級的根密度參數(shù)與土壤容重呈極顯著負相關,與土壤有機質含量呈極顯著正相關,所有徑級的根密度參數(shù)與土壤團聚體均呈顯著正相關;白羊草在0D≤5.0mm徑級區(qū)間內的根可有效改善土壤的容重,在0D≤2.0mm徑級根密度參數(shù)與土壤有機質、團聚體呈顯著正相關;達烏里胡枝子在3.0D≤5.0mm徑級的根對土壤容重影響顯著,直徑D1.0mm的根對土壤團聚體有顯著的影響;(3)土壤分離速率與根系各密度參數(shù)呈負相關。除達烏里胡枝子外,其他3種植物在0.0D≤1.0mm徑級上根密度參數(shù)與土壤分離速率均呈極顯著負相關。
[Abstract]:Four typical plant populations in the Loess Hilly region, such as Amur, Artemisia iris and Lesculia dauricae, were studied. The methods of field sampling, laboratory simulation and analysis were used. The relationship between root density parameters (root length density, root volume density, root surface area density) and soil physical and chemical properties and soil separation rate of 0-30cm soil layer was studied. The results showed that the root diameter grades of the four species were mainly between 0 D 鈮，

本文編號：1938739