隆林县土壤氮分布特征及其影响因素分析

Analysis of Soil Nitrogen Distribution Characteristics and Influencing Factors in Longlin County

以广西隆林县1∶5万土地质量地球化学评价为基础,本文分析了表层土壤氮元素含量的分布特征及其影响因素。结果表明,研究区土壤氮元素平均含量为2 041.16 mg/kg,明显高于全国耕地土壤全氮平均含量(1 450 mg/kg),整体上,氮元素较丰富。土壤氮元素含量水平在不同地质背景、土壤类型和土地利用类型中存在明显不同,泥盆系>石炭系>二叠系>寒武系>三叠系,石灰(岩)土>黄壤>水稻土>红壤,其他>林地>旱地>水田>园地。在一定范围内,土壤碱性越强,土壤中的氮元素越富集。

Based on the 1∶50 000 land quality geochemical evaluation in Longlin County,Guangxi,this paper analyzes the distribution characteristics and influencing factors of nitrogen content in the topsoil.The results show that the average soil nitrogen content in the study area is 2 041.16 mg/kg,which is significantly higher than the national average total nitrogen content (1 450 mg/kg) in cultivated soil,on the whole,nitrogen is more abundant.The soil nitrogen content levels are significantly different in different geological backgrounds,soil types and land use types,Devonian>Carboniferous>Permian>Cambrian>Triassic,lime (rock) soil>yellow soil>paddy soil>red soil,others>forest land>dry land>paddy field>garden land.Within a certain range,the stronger the soil alkalinity,the more enriched the nitrogen element in the soil.