摘要
土壤生源要素的含量和空间分布特征对指导土壤肥力调控,优化土地利用具有重要意义。以承德市伊逊河红旗周边地区为例,采集不同深度和典型剖面土壤样品,综合运用描述性统计、地统计半方差函数模型和冗余分析等方法,论述了研究区土壤生源要素碳、氮、磷和钾的空间分布格局与影响因素。结果表明,研究区表层土壤TN含量平均为848.74 mg/kg,总体较为缺乏;土壤Corg平均含量为1.35%,总体属中度水平;TP和TK含量相对丰富。TN、Corg、TP和TK土地质量地球化学等级属较丰富以上水平的样品占比分别为7.71%、26.18%、35.08%和77.85%。深层土壤TN和TP含量显著低于表层土壤,垂向分布上TN和TP含量总体呈随深度增加而降低的趋势,TK含量呈先下降后上升的趋势。土壤TP和TK空间分异以结构性变异为主,具有强烈的空间自相关性;TN和Corg分布具有中度的自相关性,空间分布受土地利用类型控制,也受农业活动等人为因素影响;土壤TP空间分布受成土母质和矿业活动因素共同影响,土壤TK空间分布则主要受成土母质自然因素控制。
Soil biogenic elements including organic carbon,nitrogen,phosphorus and potassium are of great significance to soil fertility improving and land resource optimization.Soil samples of different depths and typical profiles were collected in in the small-scale drainage catchment of Yixun River Basin of Hongqi town in Chengde City.Furthermore,the spatial structure and distribution characteristics of the biogenic elements were assessed based on descriptive statistical method and geostatistical analysis,while the influencing factors of soil biogenic elements distribution were identified by redundancy analysis.The results indicated that the average content of soil TN and Corg was 848.74 mg/kg and 1.35%respectively.The geochemical grade of land quality of total nitrogen was categorized as insufficient level while the Corg categorized as moderate level,TP and TK categorized as rich level.The proportion of TN,Corg,TP and TK samples categorized above relatively rich geochemical grade was 7.71%,26.18%,35.08%and 77.85%,respectively.The contents of TN and TP in deep soil were significantly lower than those in surface soil.In the vertical distribution,the contents of TN and TP were generally decreased with the increase of depth,while the content of TK was firstly decreased and then increased.The spatial variation of soil TP and TK exhibited strong spatial autocorrelation with a structural variation.The spatial distribution of TN and Corg was controlled by land use types,and affected by agricultural activities,while the distribution of soil TP was affected by both parent materials and mining activities,and the soil TK mainly controlled by natural factors of parent materials.
作者
孙厚云
卫晓锋
张晓敏
贾凤超
李多杰
刘卫
李健
陈自然
SUN Houyun;WEI Xiaofeng;ZHANG Xiaomin;JIA Fengchao;LI Duojie;LIU Wei;LI Jian;CHEN Ziran(School of Water Resources and Environment,China University of Geosciences,Beijing 100083;Beijing Institute of Geology for Mineral Resources Co.,Ltd.,Beijing 100012;Chengde huakan 514 geological and mineral testing research Co.,Ltd.,Chengde Hebei 067000)
出处
《矿产勘查》
2021年第4期1008-1018,共11页
Mineral Exploration
基金
中国地质调查局项目承德市生态文明示范区综合地质调查(编号:DD20160229-01,DD20190822)资助。
关键词
生源要素
土壤养分
空间变异
伊逊河
承德
河北
biogenic elements
soil nutrient
spatial variation
Yixun River Basin
Chengde
Hebei Province
