老挝中部不同利用方式土壤养分状况分析(英文)

Analysis of soil nutrient under different types of land-use in Central Laos

【目的】了解老挝中部不同利用方式土壤养分状况,为农业生产中合理施肥提高作物产量及提高土壤可持续生产力提供科学依据。【方法】在老挝中部采集3不同利用方式(水田、旱地、荒地)土壤样品,测定土壤pH值,分析其土壤有机质含量、大量元素、微量元素和中量元素含量。【结果】土壤有机质含量大小顺序为旱地>水田>荒地,土壤pH与之相反。荒地的土壤速效养分及全量养分含量均为最高。水田土壤的有效铜和有效铁含量最高,有效锌、有效锰和有效硼及交换性钙、镁则以旱地土壤含量最高。【结论】老挝中部地区土壤均呈酸性,总体肥力较低,不同利用方式土壤养分状况差别也较大。

[Objective]The purpose of this study was to understand the soil nutrient situation under different types of land use in Central Laos to provide references for the rational fertilization and to promote crop yield and soil sus- tainable productivity in agricultural production. [ Method ] Soil samples were respectively collected from paddy field, dry land, and waste land in Central Laos, and the corresponding pH value, organic matter, macronutrients and mi- cronutrients content, and medium nutrients were analyzed. [Result]The result showed that the organic matter content in soil under the three types of land-use followed the ordered sequence of dry land 〉 paddy land 〉 waste land; for pH value, on the other hand, the reverse ordered sequence applied. The contents of available N, P, K and total N, P, K in waste land measured the highest. Also, the contents of micronutrients, including available Cu and Fe, in paddy field were the highest, while the contents of micronutrients, including available Zn, Mn, and B, as well as the medium nutrients, including exchangeable Ca and Mg, in dry land were the highest amongst the three different land use types. [Conclusion]The soil in Central Laos is acidic with low fertility, and the soil nutrients situation under different types of land use is different.