本文選題：侵蝕　切入點(diǎn)：團(tuán)聚體　出處：《農(nóng)業(yè)工程學(xué)報(bào)》2017年03期

【摘要】：為研究不同雨滴直徑的降雨對(duì)耕作層團(tuán)聚體的破碎及其粒徑分布特征的影響,該文選取4個(gè)雨滴直徑(2.67~3.79 mm)對(duì)耕層土壤(0~20 cm)團(tuán)聚體進(jìn)行雨滴擊濺試驗(yàn),每次試驗(yàn)各滴5 000滴,每1 000滴收集1次濺蝕團(tuán)聚體。結(jié)果表明:1)所有收集次序中雨滴直徑3.79 mm濺蝕量最大,累積雨滴數(shù)為2 000、3 000和4 000時(shí),濺蝕量與雨滴直徑均呈顯著的指數(shù)函數(shù)關(guān)系。2)各雨滴直徑的濺蝕量隨粒徑減小呈增大-減小-增大趨勢(shì),2 mm粒徑的濺蝕量幾乎為0,0.053 mm粒徑的濺蝕量隨雨滴直徑增大而增大。3)相同雨滴直徑不同累積雨滴數(shù)之間平均重量直徑值差異不顯著,相同累積雨滴數(shù)不同雨滴直徑之間平均重量直徑值差異不顯著(P0.05)。4)不同雨滴直徑濺蝕團(tuán)聚體富集率隨粒徑變化一致,1 mm粒徑濺蝕量團(tuán)聚體富集率值接近0,0.053~1 mm粒徑團(tuán)聚體富集,1 mm粒徑團(tuán)聚體主要破碎成0.053~1 mm粒徑團(tuán)聚體,且粒級(jí)越小,富集率越高。研究可為黃土高原地區(qū)水土保持提供理論依據(jù)。
[Abstract]:In order to study the effect of rainfall with different raindrop diameters on the fragmentation and particle size distribution characteristics of aggregates in tilling layer, four raindrop diameters (2.67 ~ 3.79 mm) were selected to carry out the raindrop splash test on the topsoil (20 cm) aggregates, each of which was 5 000 drops. The results show that the raindrop diameter of 3.79 mm is the largest in all the collection sequences, and the cumulative raindrop number is 2 000 ~ 3 000 and 4 000. Spatter amount and raindrop diameter have significant exponential function relationship. 2) the splash erosion amount of each raindrop diameter increases with the decrease of the diameter of the raindrop. The trend of splash erosion is increasing with the decrease of the diameter of the raindrop. The splash erosion amount of the diameter of 2 mm is almost 0 ~ 0.053 mm. The amount of splash erosion increases with the diameter of the raindrop. The difference of mean weight diameter between the same raindrop diameter and cumulative raindrop number is not significant. No significant difference in mean weight diameter between different raindrop diameters (P0.05 路4) the enrichment rate of splash erosion aggregates with different raindrop diameters is the same as the variation of particle size. The enrichment rate of aggregates is close to 0 ~ 0.0531mm in diameter. The aggregates with a diameter of 1 mm were mainly broken into 0. 053 ~ 1 mm aggregates. The smaller the grain size, the higher the enrichment rate. The study can provide a theoretical basis for soil and water conservation in the Loess Plateau.
【作者單位】： 西北農(nóng)林科技大學(xué)水土保持研究所;西北農(nóng)林科技大學(xué)資源環(huán)境學(xué)院;綿陽(yáng)市農(nóng)業(yè)科學(xué)研究院;中國(guó)電建集團(tuán)華東勘測(cè)設(shè)計(jì)研究院有限公司;
【基金】：國(guó)家自然科學(xué)基金(41571262)
【分類(lèi)號(hào)】：S157.1

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1 梁雙雙;林金石;黃炎和;蔣芳市;葛宏力;汪倩;王正清;賈s，

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