摘要
采用室内模拟方式,探究温度、水分及冻融交替对锌施入黑钙土后有效锌含量及锌形态转化的影响。结果表明:210 d时,30℃时土壤有效锌含量比-10℃时有效锌含量分别高16. 4%(20%含水量)和8. 3%(10%含水量)。冻融作用会加剧土壤有效锌含量的降低,经20个冻融周期处理后的土壤有效锌含量比未经冻融土壤降低1. 6%。温度及水分会对土壤锌形态转化产生影响,210 d时,30℃时交换态锌含量比-10℃时高出25. 2%(20%含水量)和6. 6%(10%含水量);碳酸盐结合态锌含量随温度的升高逐渐降低,10%含水量时降幅更为明显;温度和含水量的升高会在一定程度上增加有机结合态锌及残渣态锌的含量。冻融作用会促进土壤锌趋于稳定化。这说明,黑钙土缺锌易发生于低温、湿度大的土壤环境中;冻融交替作用会降低土壤有效锌含量,促使锌的稳定化。
In this study,an indoor modeling method was used to investigate the effects of temperature,moisture,and freeze-thaw cycles on zinc content and zinc speciation transformation after application of zinc to Chernozem. The results showed that at 210 d,available zinc content was higher when soil was at higher temperature or lower water content. At 30 ℃,available zinc content in soil was higher than that at-10 ℃ by 16. 4%(20% water content) and 8. 3%(10% water content),respectively. Freeze-thaw cycles would aggravate the reduction of available zinc content in soil. After20 freeze-thaw cycles,available zinc content in soil was 1. 6% lower than that without freeze-thaw circles. Temperature and moisture would affect the transformation of zinc speciation in soil as well.Throughout the experiment,exchangeable zinc content in soil increased at first and then decreased.At 210 d,exchangeable zinc content at 30 ℃ was 25. 2%(20% water content) and 6. 6%(10%water content) higher than-10 ℃,respectively. Carbonate bound zinc decreased gradually with increasing temperature,and the decline was more significant at 10% water content. Iron manganese oxidized zinc increased in a short time markedly,and then decreased with time gradually. Increased temperature and moisture could increase the percentage of organically bound zinc and residual zinc to some extent. Freeze-thaw cycles promoted the stabilization of soil zinc. The above study shows that zinc deficiency in chernozem is prone to occur in low temperature and high moisture soil environment; freeze-thaw circles reduce available zinc content in soil and promote the transformation of zinc to the stable form.
作者
张亦婷
李传松
赵兴敏
王鸿斌
隋标
赵兰坡
ZHANG Yiting;LI Chuansong;ZHAO Xingmin;WANG Hongbin;SUI Biao;ZHAO Lanpo(College of Resources and Environment, Jilin Agricultural University, Key Laboratory of Sustainable Utilization of Soil Resources in Commodity Grain Bases of Jilin Province, Changchun 130118, China)
出处
《吉林农业大学学报》
CAS
CSCD
北大核心
2019年第4期443-449,共7页
Journal of Jilin Agricultural University
基金
国家自然科学基金项目(41403077)
国家科技重大专项(2014ZX07201-011)
关键词
有效锌
黑钙土
温度
水分
冻融交替
available zinc
chernozem
temperature
moisture
freeze-thaw circle
