Soil improvement at sand dune by using tropical peat.

利用热带泥炭改良沙丘土壤。

• 批准号: 09660279
• 负责人: ISHIDA Tomoyasu
• 金额: $ 2.11万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09660279/
• 关键词: soil improvement; sand; peat; tropical coast; 砂丘砂

In order to evaluate the possibility of crop growth after improvement of the soil layer at sand dune in tropical coastal area, the effect of mixing of tropical peat and/or mountain soil into sand was examined. The following results showed the possibility of crop cultivation after improvement of the soil.1. Mixing of the peat and the mountain soil decreased hydraulic conductivity and increased water holding capacity of the sand ; too much mixing may cause poor drainage, aeration, and available water content. The optimum mixing ratio in dry weight basis was estimated to be 84 : 6 : 10 for sand peat mountain soil ; the mixing ratio increased the available water content 3 times.2. SPAC model simulation was applied to evaluate the effect of the mixing. Meteorological data and crop data were collected at sand dune area in Narathiwat province, the southmost of Thailand. The results showed that the optimum mixture condition increased transpiration 1.5 times more than original sand and drainage of infiltrated rainfall decreased from 43% to 27%.3. Eluviat ion of nutrition from soil layer was estimated by using the break-through curve and simulated drainage. All fertilizer in sand soil layer was estimated to eluviate by only 30% of yearly total drainage water ; 20% of fertilizer was estimated to remain after yearly total drainage water had passed.

为了评估热带沿海地区沙丘土层改良后作物生长的可能性，研究了热带泥炭和/或山土与沙子的混合效果。以下结果表明改良土壤后种植农作物的可能性： 1．泥炭与山土的混合降低了沙子的导水率，增加了沙子的持水能力；过多的混合可能会导致排水、通气和有效含水量不良。对于沙泥炭山土，以干重计，最佳混合比为84：6：10；配合比使有效含水量增加3倍。2．应用SPAC模型模拟来评估混合效果。气象数据和农作物数据是在泰国最南端陶公府的沙丘地区收集的。结果表明，最佳混合条件使蒸腾量比原沙增加了1.5倍，入渗降雨的排水量由43%下降到27%。3．利用突破曲线和模拟排水来估计土壤层营养物质的淋溶量。据估计，沙土层中的所有肥料仅被年排水总量的30％淋溶；每年总排水量过后，估计还剩下 20% 的肥料。