本文選題：根長(zhǎng)密度 + 根體積密度��； 參考：《水土保持學(xué)報(bào)》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(dá)烏里胡枝子)為研究對(duì)象,采用野外采樣、室內(nèi)模擬試驗(yàn)與分析相結(jié)合的方法,對(duì)0—30cm土層的各徑級(jí)根系密度參數(shù)(根長(zhǎng)密度、根體積密度、根表面積密度)與土壤理化性質(zhì)、土壤分離速率間的關(guān)系進(jìn)行了研究。結(jié)果表明:(1)4種植物的根系徑級(jí)主要集中在0D≤1.0mm之間,86%~93%的根長(zhǎng)和46%~61%的根表面積分布在此范圍內(nèi),且根系徑級(jí)越大,根系各密度參數(shù)越小;(2)4種植物各徑級(jí)根密度參數(shù)對(duì)土壤理化性質(zhì)(容重、有機(jī)質(zhì)、團(tuán)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(jī)質(zhì)含量呈極顯著相關(guān);鐵桿蒿在0D≤1.0mm徑級(jí)的根密度參數(shù)與土壤容重呈極顯著負(fù)相關(guān),與土壤有機(jī)質(zhì)含量呈極顯著正相關(guān),所有徑級(jí)的根密度參數(shù)與土壤團(tuán)聚體均呈顯著正相關(guān);白羊草在0D≤5.0mm徑級(jí)區(qū)間內(nèi)的根可有效改善土壤的容重,在0D≤2.0mm徑級(jí)根密度參數(shù)與土壤有機(jī)質(zhì)、團(tuán)聚體呈顯著正相關(guān);達(dá)烏里胡枝子在3.0D≤5.0mm徑級(jí)的根對(duì)土壤容重影響顯著,直徑D1.0mm的根對(duì)土壤團(tuán)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(fù)相關(guān)。除達(dá)烏里胡枝子外,其他3種植物在0.0D≤1.0mm徑級(jí)上根密度參數(shù)與土壤分離速率均呈極顯著負(fù)相關(guān)。
[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(hào)：1938739