南阳盆地农耕区表层土壤酸碱度现状研究

Study on the Status of Surface Soil Acidity and Alkalinity in Agricultural Areas of Nanyang Basin

南阳盆地土地质量地球化学调查显示,南阳盆地表层土壤pH呈酸性-强酸性,酸性-强酸性土壤面积占调查面积的90%以上。与全国第二次土壤普查相比,调查区表层土壤存在一定的酸化趋势,酸性土壤主要分布在农耕区。不同土壤类型中,灰潮土pH偏低,黄褐土、砂姜黑土、黄褐土性土次之,通过土壤垂向剖面数据分析,土壤呈酸化趋势主要受外部环境影响,气候条件、农业生产等可能是主要因素。

The investigation showed that the land quality Geochemical Survey in Nanyang Basin,the pH showed acid-strong acid of surface soil in Nanyang Basin,acid-strong acid soil area more than 90%of the investigated areas.Compared with the second nation-wide soil survey,there was a certain acidification trend in the surface soil of the survey area,acid soil was mainly distributed in farming area.In different soil types,the pH of limonitic soil was lower than that of yellow cinnamon soil,Shajiang black soil and yellow cinnamon soil.Through the analysis of soil vertical profile data,the soil acidification trend was mainly affected by the external environment,and climatic conditions and agricultural production may be the main factors.