【摘要】：土壤抗侵蝕能力特征是土壤侵蝕預(yù)測(cè)預(yù)報(bào)的重要依據(jù)之一,為了分析黃土區(qū)不同生長期大豆坡耕地土壤抗侵蝕能力特征,采用原狀土沖刷槽和靜水崩解法,分別在大豆不同生長期測(cè)定坡耕地不同土層土壤抗沖性和抗蝕性,并對(duì)大豆根系特征與土壤抗侵蝕能力的關(guān)系進(jìn)行分析。結(jié)果表明:隨著大豆生育期的推進(jìn)呈現(xiàn)出先增強(qiáng)后減弱的趨勢(shì),始粒期土壤抗侵蝕能力最強(qiáng),苗期最弱;在大豆苗期與分枝期,土壤抗侵蝕能力隨土層深度的增加而減弱;大豆開花期以后10~20 cm土層土壤抗侵蝕能力最強(qiáng),其次為0~5 cm土層;土壤根重密度、根系表面積、根系體積及根系長度對(duì)土壤抗侵蝕能力影響均達(dá)到極顯著水平(p0.01),且根徑在0~0.5 mm之間根系的增多會(huì)更加有效地提高土壤的抗侵蝕能力。這表明在大豆生長初期加強(qiáng)對(duì)坡面的有效防護(hù),避免地表長期裸露,培育根系發(fā)達(dá)的大豆品種將有助于對(duì)坡耕地土壤侵蝕的防控。
[Abstract]:The characteristics of soil erosion resistance are one of the important bases for soil erosion prediction and prediction. In order to analyze the characteristics of soil erosion resistance of soybean sloping farmland at different growth stages in loess area, the original soil scouring trough and static water collapse method were adopted. The soil scour resistance and corrosion resistance of different soil layers of sloping farmland were measured at different growth stages of soybean, and the relationship between root characteristics and soil erosion resistance of soybean was analyzed. The results showed that with the advance of soybean growth period, the soil erosion resistance was the strongest and the weakest at the initial grain stage, and the soil erosion resistance decreased with the increase of soil depth at seedling stage and branch stage. After flowering, the soil erosion resistance of 10 脳 20 cm soil layer was the strongest, followed by 0 脳 5 cm soil layer. The effects of soil root weight density, root surface area, root volume and root length on soil erosion resistance were very significant (p0.01). The increase of root diameter between 0 鈮，

本文編號(hào)：2477586