本文選題：沙打旺　切入點：紫花苜蓿　出處：《水土保持學(xué)報》2017年03期 　論文類型：期刊論文

【摘要】：為了對比沙打旺和紫花苜蓿的減流減沙效果,設(shè)置3種流量(1,2,3m~3/h),5種植被覆蓋度(100%,75%,50%,25%和0),利用潛水泵進行徑流沖刷試驗。結(jié)果表明:(1)種植沙打旺和紫花苜蓿的坡面入滲系數(shù)大于對照組,徑流量及產(chǎn)沙量小于對照組,說明沙打旺和紫花苜蓿均具有減流減沙效果。(2)沙打旺的減流減沙效果優(yōu)于紫花苜蓿,以流量為3m~3/h時為例,種植紫花苜蓿、沙打旺的坡面入滲系數(shù)分別比對照組增加了5.8%和45.3%;徑流總量分別比對照組減少了3.7%和11.2%;對照組產(chǎn)沙量分別是種植紫花苜蓿和沙打旺的坡面產(chǎn)沙量的6.40倍和9.19倍;沙打旺組坡面入滲效果、減沙效益均優(yōu)于紫花苜蓿組,而紫花苜蓿組的徑流量穩(wěn)定值、徑流總量優(yōu)于沙打旺組。(3)植被的減流減沙效益存在臨界現(xiàn)象,50%~75%是本地區(qū)草本植物減沙效益的臨界蓋度。
[Abstract]:In order to compare the effect of flow and sediment reduction between Astragalus adsurianum and alfalfa, Set up three kinds of flow rate (1 / 2) / 3 / 3 / h ~ (-1) planting coverage degree of 100% and 25% and 0% respectively and use submersible water pump to carry out runoff scour test. The results showed that the infiltration coefficient of slope surface of Astragalus dadaricum and alfalfa was higher than that of control group, and the runoff and sediment yield were smaller than that of control group, and the runoff and sediment yield were lower than that of the control group, the results showed that the infiltration coefficient of the slope was higher than that of the control. The results showed that both Astragalus adsurgens and alfalfa had the effect of reducing flow and sediment. (2) the effect of reducing flow and sediment was better than that of alfalfa, and the alfalfa was planted when the flow rate was 3 ~ 3 / h. Compared with the control group, the infiltration coefficient increased by 5.8% and 45.3, the total runoff decreased by 3.7% and 11.2, and the sediment yield of the control group was 6.40 and 9.19 times of that of alfalfa and Astragalus adsuriformis respectively. The effect of infiltration on slope surface and the benefit of sediment reduction were superior to those of alfalfa group, but the runoff of alfalfa group was stable. The total runoff amount is better than that of Shadadao formation. 3) the critical phenomenon of runoff and sediment reduction benefits of vegetation is that 75% is the critical coverage degree of vegetation sediment reduction benefit in this area.
【作者單位】： 北京林業(yè)大學(xué)水土保持學(xué)院;北京市延慶區(qū)水土保持工作站;
【基金】：北京林業(yè)大學(xué)青年教師科學(xué)研究中長期項目(2015ZCQ-SB-03)
【分類號】：S157.43

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