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首页> 美国卫生研究院文献>other >Effects of soil pH and texture on soil carbon and nitrogen in soil profiles under different land uses in Mun River Basin Northeast Thailand
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Effects of soil pH and texture on soil carbon and nitrogen in soil profiles under different land uses in Mun River Basin Northeast Thailand

机译：泰国东北部芒河流域不同土地利用方式下土壤pH和质地对土壤剖面中碳氮的影响

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摘要

Soil carbon and nitrogen are essential factors for agricultural production and climate changes. A total of 106 soil samples from three agricultural lands (including two rice fields and one sugarcane field) and four non-agricultural lands (including two forest lands, one wasteland and one built-up land) in the Mun River Basin were collected to determine soil carbon, nitrogen, soil pH, soil particle sizes and explore the influence of pH and soil texture on soil C and N. The results show that total organic carbon (TOC) and nitrogen (TON) contents in topsoil (TOC: 2.78 ~ 18.83 g kg−1; TON: 0.48 ~ 2.05 g kg−1) are much higher than those in deep soil (TOC: 0.35 ~ 6.08 g kg−1; TON: <0.99 g kg−1). In topsoil, their contents of forest lands and croplands (TOC: average 15.37 g kg−1; TON: average 1.29 g kg−1) are higher than those of other land uses (TOC: average 5.28 g kg−1; TON: average 0.38 g kg−1). The pH values range from 4.2 to 6.1 in topsoil, and with increase in soil depth, they tend to increase and then decrease. Soil carbon, nitrogen and the C/N (TC/TN ratio) are negatively correlated with soil pH, demonstrating that relatively low pH benefits the accumulation of organic matter. Most soil samples are considered as sandy loam and silt loam from the percentages of clay, silt and sand. For soil profiles below 50 cm, the TOC and TON average contents of soil samples which contain more clay and silt are higher than those of other soil samples.
机译：土壤碳和氮是农业生产和气候变化的重要因素。从门河流域的三个农业用地（包括两个稻田和一个甘蔗地）和四个非农业用地（包括两个林地，一个荒地和一个建成地）收集了106个土壤样品，以确定土壤碳，氮，土壤pH，土壤粒径以及探索pH和土壤质地对土壤碳氮的影响。结果表明，表土中总有机碳（TOC）和氮（TON）含量（TOC：2.78〜18.83） g kg -1 ; TON：0.48〜2.05 g kg -1 ）远高于深层土壤（TOC：0.35〜6.08 g kg -1） ；吨：<0.99 g kg -1 ）。在表层土壤中，林地和农田的含量（TOC：平均15.37 g kg -1 ； TON：平均1.29 g kg -1 ）高于其他土地用途（TOC：平均5.28 g kg -1 ； TON：平均0.38 g kg -1 ）。表层土壤的pH值范围为4.2至6.1，并且随着土壤深度的增加，它们倾向于先升高后降低。土壤碳，氮和碳/氮（TC / TN比）与土壤pH呈负相关，这表明较低的pH值有利于有机质的积累。从粘土，淤泥和沙子的百分比来看，大多数土壤样品被认为是沙壤土和粉质壤土。对于50 cm以下的土壤剖面，粘土和淤泥含量较高的土壤样品的TOC和TON平均含量高于其他土壤样品。

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