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首页> 外文期刊>International journal of soil science >The Effect of Cultivation on Organic Carbon Content in the Clay Mineral Fraction of Soils
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The Effect of Cultivation on Organic Carbon Content in the Clay Mineral Fraction of Soils

机译：耕作对土壤黏土矿物级分有机碳含量的影响

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Conversion of native land, into a cultivated system causes precipitous degradation of the soil organic matter . It is reported that C stored in the clay mineral fraction contributes more to the long-term stability of C than sand and silt fraction. This study reports on the soil organic carbon in the clay mineral fraction of some cultivated lands in Sri Lanka and how it deviates from the adjacent natural forests. The field sites included 7 cultivated lands (tea, rubber, coconut, mixed crops, potato, home garden, chena cultivation) and 7 tropical forest types (wet evergreen, semi evergreen, moist monsoon, dry monsoon, montane, dry mixed evergreen). The significant differences in carbon content of the clay fraction between the cultivated land and the adjacent forest in the same location revealed that cultivation has decreased the carbon content in all sites. The highest C content shown by the mixed crop and rubber plantations showed that minimum land management and soil tillage involved with this reduced the rate of decomposition. High temperature of dry mixed evergreen forest and dry monsoon forest may have increased the decomposition rates and lowered the SOC in the clay fraction compared to the other forests. Significant correlations were observed in forests with in clay fraction and climatic parameters but to a lesser extent in cultivated lands. Considerable variations in organic matter input in cultivated lands will be the reason for these weak relationships. The study confirmed that clay mineral fraction was also equally affected during long term cultivation although it was reported to be more stable against rapid decomposition.
机译：将本国土地转化为耕作系统会导致土壤有机物的急剧降解。据报道，储存在粘土矿物组分中的碳比砂和粉砂组分对碳的长期稳定性有更大的贡献。这项研究报告了斯里兰卡某些耕地的粘土矿物部分中的土壤有机碳及其与邻近自然森林的偏离情况。田间地点包括7个耕地（茶，橡胶，椰子，混合作物，马铃薯，家庭菜园，月季栽培）和7种热带森林类型（湿性常绿，半常绿，潮湿的季风，干燥的季风，山地，干燥的混合常绿）。在同一地点，耕地和邻近森林之间的粘土部分碳含量存在显着差异，表明耕作降低了所有地点的碳含量。混合作物和橡胶园显示的最高碳含量表明，与此相关的最低土地管理和耕作降低了分解速度。与其他森林相比，干旱的混合常绿森林和干燥的季风森林的高温可能增加了分解速率，并降低了黏土部分的SOC。在森林中，粘土含量和气候参数之间存在显着的相关性，但耕地中的相关性较小。耕地中有机质输入的显着变化将是这些弱关系的原因。这项研究证实，尽管据报导，粘土矿物质成分对快速分解更稳定，但在长期种植期间也同样受到影响。

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