蒲玉琳, 谢德体, 林超文, 魏朝富. 植物篱-农作模式坡耕地土壤综合抗蚀性特征[J]. 农业工程学报, 2013, 29(18): 125-135. DOI: 10.3969/j.issn.1002-6819.2013.18.016
    引用本文: 蒲玉琳, 谢德体, 林超文, 魏朝富. 植物篱-农作模式坡耕地土壤综合抗蚀性特征[J]. 农业工程学报, 2013, 29(18): 125-135. DOI: 10.3969/j.issn.1002-6819.2013.18.016
    Pu Yulin, Xie Deti, Lin Chaowen, Wei Chaofu. Characteristics of soil comprehensive anti-erodibility under sloped cropland with hedgerows[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2013, 29(18): 125-135. DOI: 10.3969/j.issn.1002-6819.2013.18.016
    Citation: Pu Yulin, Xie Deti, Lin Chaowen, Wei Chaofu. Characteristics of soil comprehensive anti-erodibility under sloped cropland with hedgerows[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2013, 29(18): 125-135. DOI: 10.3969/j.issn.1002-6819.2013.18.016

    植物篱-农作模式坡耕地土壤综合抗蚀性特征

    Characteristics of soil comprehensive anti-erodibility under sloped cropland with hedgerows

    • 摘要: 土壤抗剪强度、抗蚀性与抗冲性不仅反映了土壤对水力侵蚀不同发育阶段(雨滴溅蚀、薄层水流片蚀与股流沟蚀)的侵蚀力大小,还通过共存、耦合决定对抗水力侵蚀的综合能力(综合抗蚀性)的大小。利用植物篱控制水土流失的长期定位试验,采用数理统计法研究了植物篱-农作坡耕地土壤综合抗蚀性特征。结果表明,由于植物篱模式下土壤理化性质得以改善,加之网状植物篱根系的固结等作用促使土壤综合抗蚀性增强。紫穗槐、香根草、紫花苜蓿和蓑草植物篱-农作模式土壤综合抗蚀指数分别比常规横坡农作模式增加102.9%、91.9%、87.9%、82.9%。不同植物篱模式增强土壤综合抗蚀性效应的大小为,20o坡地紫穗槐>香根草,13o坡地紫花苜蓿>蓑草。植物篱模式也增强了各坡位土壤综合抗蚀性,改善了土壤综合抗蚀性的过大坡面异质性。该论文为进一步探究植物篱模式控制水土及氮磷等污染物流失提供参考。

       

      Abstract: Abstract: Soil shear strength (SS), anti-erodibility (AE), and anti-scouring (AS) not only reflect strength of soil confronting water erosion in different developmental stages (raindrop erosion, sheet erosion by sheet flow, gully erosion of streams), but also decide comprehensive ability of soil confronting water erosion by their coexistence and coupling. Hedgerow patterns have been used as one of controlling techniques for agricultural non-point pollution (especially nitrogen and phosphorus loss of farmland). At present, research studies on effect of hedgerow patterns controlling soil and water, nitrogen, and phosphorus loss are extensive. However, soil comprehensive anti-erodiblity (CAE), one of their internal causes, is hardly discussed. Soil AE, including SS and AS, is called soil CAE in this paper. Taking sloped farmland in central Sichuan as the research subject, based on a long-term experiment on the effect of hedgerows controlling soil and water loss, characteristics of soil CAE were studied with mathematical statistics in this paper to provide a research basis for the mechanism of hedgerow patterns controlling soil, water, nitrogen, and phosphorus losses. Results show that soil AE and CAE of hedgerow-crop patterns were higher than that of the conventional contour pattern. The soil AE index (AEI) for the Amorpha (T1), Vetiver (T2), Alfalfa (T3) and Eulaliopsis binata (T4) patterns increased by 3.99、2.65、3.13、and 2.36, respectively. The soil CAE index (CAEI) for the T1, T2, T3, and T4 patterns increased by 102.9%, 91.9%, 87.9%, and 82.9%, respectively. Therefore, in terms of CAE, the order of the effect of different hedgerow patterns increasing soil CAE was Amorpha > Vetiver in 20o slope farmland, Alfalfa > Eulaliopsis binata in 13o farmland. Compared with conventional contour crop patterns, hedgerow and crop belt soil AE and CAE of sloped farmland in each slope position were improved under hedgerow-crop patterns, especially hedgerow belts. Hedgerow-crop patterns weaken considerably the conditions that soil AEI and CAEI decreasing by nearly line from low slope to top slop, which improved excessive slope heterogeneity of soil AE and CAE in slope farmland. Under hedgerow-crop patterns, soil AE and CAE were significantly or apparently increased because of multiple hedgerow belts improving soil physicochemical properties (such as the increasing soil clay content and organic matter), and multiple effects (such as the consolidation and frictional effects) of hedgerow roots. The paper is to provide a research basis for exploring how hedgerow patterns control the loss of soil, water, nitrogen, and phosphorus and eventually other pollutants.

       

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