S. Wicharuck, Nuttapon Khongdee, Nipon Mawan, K. Stahr
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引用次数: 0
摘要
由于管理不善,水土流失是坡耕地面临的严重风险。本研究旨在评价和比较不同土地利用类型下土壤流失和径流的动态变化,为可持续土地利用规划寻找最佳的土壤侵蚀控制方案。2008-2009年期间在泰国高地西北部Mea Hong Son省的Bor Krai村进行了实地试验。选择4种土地利用类型进行对比测量,分别为:1)4年荒地(FaL)、2)混合果园(MixO)、3)玉米(M)和4)旱稻(UR)。利用模拟Gerlach槽(GT)监测每次有效暴雨后的地表径流(SR)和土壤流失量(SL)。GT由竹子制成,通过一根橡胶管与一个50升的容器相连。GTs的尺寸为0.5-0.7 m长,0.1-0.2 m直径。在每个土地用途的下部垂直于等高线安装GTs。结果表明:2年期间,水土保持不合理的单作导致土壤的SR和SL平均最高(SR=299 m 3 ha -1)和(SL=3.4 tha -1),而放养导致土壤的SR和SL最低(41 m 3 ha -1)和SL (0.01 tha -1)。此外,对不同土地利用类型下的年土壤流失量进行长期预测还需进一步研究。
Soil erosion assessment under different land use types using modified Gerlach trough in North-Western Thailand Highland
Soil erosion is a severe risk on the sloping agricultural land due to improper managements. This study aimed to evaluate and compare the dynamics of soil loss and runoff under different land use types in order to fi nd the best soil erosion control for sustainable land use planning. A fi eld trial was conducted in Bor Krai village, Mea Hong Son Province, North-Western Thai Highlands during 2008–2009. Four land use types were selected for comparative measurement, including i) 4-year-fal-low land (FaL), ii) mixed orchard (MixO), iii) maize (M) and iv) upland rice (UR). Surface runoff (SR) and soil loss (SL) were monitored after each effective rainstorm using modi fi ed Gerlach troughs (GT). The GT was made of a bamboo and linked to a 50-litre container by a rubber hose. The size of GTs was 0.5–0.7 m long and 0.1–0.2 m diameter. The GTs were installed perpendicular to the contour line at the lower part of each land use. The results showed that, during the 2-yr, monoculture with inappropriate soil water conservation caused the fi rst average highest values of SR and SL (SR=299 m 3 ha –1 ) and (SL=3.4 t ha –1 ) while FaL yielded the lowest SR (41 m 3 ha –1 ) and SL (0.01 t ha –1 ) amounts. Moreover, further study is required for long-term prediction to estimate annual soil loss under different land use types.
期刊介绍:
Soil Science Annual journal is a continuation of the “Roczniki Gleboznawcze” – the journal of the Polish Society of Soil Science first published in 1950. Soil Science Annual is a quarterly devoted to a broad spectrum of issues relating to the soil environment. From 2012, the journal is published in the open access system by the Sciendo (De Gruyter).