重庆渝东北植烟区土壤交换性钙镁与土壤属性的关联特性研究  

Association Between Exchangeable Calcium(Ca^(2+))and Magnesium(Mg^(2+))with Other Soil Properties in Tobacco Planting Area of Northeast Chongqing

作　　者：郝尚妍 周嵘 徐宸 陈天才 冉茂 代先强[4] 周鑫斌[1] HAO Shangyan;ZHOU Rong;XU Chen;CHEN Tiancai;RAN Mao;DAI Xianqiang;ZHOU Xinbin(College of Resources and Environment,Southwest University,Chongqing 400716,China;Shizhu Branch of Chongqing Tobacco Company,China National Tobacco Corporation,Shizhu,Chongqing 409100,China;Fengjie Branch of Chongqing Tobacco Company,China National Tobacco Corporation,Fengjie,Chongqing 404600,China;Tobacco Leaf Branch of Chongqing Tobacco Company,China National Tobacco Corporation,Chongqing 400020,China)

机构地区：[1]西南大学资源环境学院,重庆400716 [2]中国烟草总公司重庆市公司石柱分公司,重庆石柱409100 [3]中国烟草总公司重庆市公司奉节分公司,重庆奉节404600 [4]中国烟草总公司重庆市烟叶分公司,重庆400020

出　　处：《土壤》2023年第2期288-294,共7页Soils

基　　金：中国烟草总公司重庆市公司科技项目(B20221NY1307,B20221NY1314)资助。

摘　　要：为明确重庆渝东北植烟区土壤中交换性钙、镁养分状况与土壤属性的关联特性,为烟区养分管理提供参考依据,利用GPS定位技术在渝东北植烟区采集了1092个代表性土壤样品,对巫溪、巫山、奉节、万州、涪陵和丰都6个区县植烟土壤交换性钙和交换性镁含量分析,同时与其他土壤属性进行关联分析。结果表明:重庆渝东北植烟土壤交换性钙、镁含量丰富,其平均值分别为10.85 cmol/kg和1.79 cmol/kg,但也存在缺乏现象,且区域分布不均衡。总体来看,土壤交换性钙缺乏(<6 cmol/kg)占比28.30%,土壤交换性镁缺乏(<1.0 cmol/kg)占比42.75%。涪陵县与丰都县的土壤交换性钙、镁缺乏最严重,占比分别为40.00%和55.00%。丰都县与万州区土壤交换性钙、镁含量最适宜烤烟种植,占比分别为42.00%和36.61%。母质是影响土壤交换性钙、镁含量的重要因素,二叠系泥灰岩发育形成的土壤交换性钙、镁含量较高,侏罗纪紫色砂岩含量最低。植烟土壤pH、阳离子交换量与交换性钙、镁存在显著正相关关系,而土壤交换性酸总量与二者呈显著负相关,交换性钙镁缺乏是引起烟田酸化的主要原因。1~2 mm与<0.25 mm粒径团聚体是引起土壤交换性钙、镁分异的关键因子,应当促进粒径>2 mm的土壤大团聚体的形成。本研究可为重庆渝东北地区植烟土壤交换性钙、镁养分管理提供科学依据。In order to clarify the correlation between exchangeable calcium(Ca^(2+))and magnesium(Mg^(2+))contents with other soil properties in the northeastern Chongqing tobacco-growing region,and provide reference basis for nutrient management in tobatacco planting areas,1092 typical soil samples were collected from Wuxi,Wushan,Fengjie,Wanzhou,Fuling and Fengdu using GPS positioning technology,and Ca^(2+) and Mg^(2+) contents and their correlation with other soil properties were analyzed.The results show that the average contents of Ca^(2+) and Mg^(2+) are 10.85 cmol/kg and 1.79 cmol/kg,respectively,but there are also deficiencies and uneven regional distribution,28.30%and 42.75%of the samples are deficient in Ca^(2+)(<6 cmol/kg)and Mg^(2+)(<1.0 cmol/kg),respectively.Ca2+and Mg2+deficiencies are most severe in Fuling and Fengdu counties,accounting for 40.00%and 55.00%,respectively.Fengdu County and Wanzhou District have the most suitable Ca^(2+) and Mg^(2+) contents,with 42.00%and 36.61%respectively.The parent material is an important factor influencing Ca^(2+) and Mg^(2+) contents,which are high in soils derived from Permian marl but low in soils derived from Jurassic purple sandstone.Ca^(2+) and Mg^(2+) are significantly positively correlated with soil pH and cation exchange,whereas significantly negatively correlated with total soil exchangeable acid.Deficiencies in Ca^(2+) and Mg^(2+) are the main cause of soil acidification in tobacco-planting fields.1~2 mm and<0.25 mm aggregates are the key factors causing Ca^(2+) and Mg^(2+) differentiation,and the formation of large soil aggregates(>2 mm)should be promoted to prevent soil acidification.This study can guide the management of soil Ca^(2+) and Mg^(2+) nutrients in tobacco-planting fields in the northeastern part of Chongqing.

关 键 词：植烟土壤 交换性钙 交换性镁 烟田酸化 

分 类 号：S158.5[农业科学—土壤学]