本文選題：根系 + 內(nèi)摩擦角��； 參考：《草業(yè)學(xué)報(bào)》2017年07期

【摘要】：為探討紫色土區(qū)草類根系特征及對(duì)土壤抗侵蝕性的影響,本試驗(yàn)選取坡地香根草和馬唐為研究對(duì)象,分0~10cm、10~20cm和20~30cm土層采集根系和土壤樣品,分別采用WinRHIZO(Pro.2004c)根系分析系統(tǒng)、ZJ型應(yīng)變控制式直剪儀和改進(jìn)的原狀土沖刷水槽測(cè)定根系指標(biāo)、根-土復(fù)合體抗剪和抗沖性能,研究了不同土層香根草和馬唐的根系特征及與土壤抗侵蝕性之間的關(guān)系。結(jié)果表明,0~30cm土層范圍內(nèi),香根草根系的總體指標(biāo)和徑級(jí)指標(biāo)(根長密度、根表面積密度、根體積密度和根重密度)均優(yōu)于馬唐;較之馬唐,香根草更有利于降低土壤容重,改善土壤微團(tuán)聚體組成狀況和提高土壤有機(jī)碳含量;上述2種草類根-土復(fù)合體的抗沖剪性能均表現(xiàn)為:0~10cm土層最優(yōu),10~20cm土層次之,20~30cm土層最差,且各土層均表現(xiàn)為香根草的優(yōu)于馬唐的;相關(guān)分析表明,1.0d(直徑)≤2.0mm是影響復(fù)合體粘聚力和抗沖指數(shù)的關(guān)鍵徑級(jí),其次是徑級(jí)d≤1.0mm。本研究結(jié)果可為紫色土區(qū)水土保持植被構(gòu)建提供理論依據(jù)。
[Abstract]:In order to study the root system characteristics of grass in purple soil and its effect on soil erosion resistance, the root system and soil samples of Vetiveria villosa and Corydaceae were collected from 0 ~ 10cm ~ (10) cm ~ (10) ~ (10) cm and 20~30cm soil layers. The root system (WinRHIZOO Pro.2004c) was used to determine the root system index, the shear and impact resistance of root-soil complex, and the improved undisturbed soil scour flume. The relationship between root characteristics of Vetiver and Corydaceae and soil erosion resistance in different soil layers was studied. The results showed that the total index and diameter index (root length density, root surface area density, root volume density and root weight density) of Vetiveria villosa root were superior to those of Cortex chinensis in the soil layer of 30 cm. To improve the composition of soil microaggregates and increase the content of soil organic carbon, the impact and shear properties of the two recommended root-soil complexes were as follows: the best soil layer was 10 ~ (10) cm soil layer, the second layer was 20 ~ (30) cm soil layer, the next one was 20 ~ (30) cm soil layer. The correlation analysis showed that 1.0 d (diameter) 鈮，

本文編號(hào)：1955068