冻融作用对河岸缓冲带土壤磷素迁移的影响  

Effects of Freeze-thaw on Phosphorus Migration in Riparian Buffer Zone

作　　者：汤家喜 梁伟静 何苗苗 郭玲玲[3] TANG Jia-xia;LIANG Wei-jinga;HE Miao-miaob;GUO Ling-ling(College of Environmental Science and Engineering,b.School of Civil Engineering,Liaoning Technical University,FuxinL iaoning 123000,China;Liaoning Academy of Microbiology,Chaoyang Liaoning 122000,China)

机构地区：[1]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000 [2]辽宁工程技术大学土木工程学院,辽宁阜新123000 [3]辽宁省微生物科学研究院,辽宁朝阳122000

出　　处：《沈阳农业大学学报》2023年第5期592-598,共7页Journal of Shenyang Agricultural University

基　　金：辽宁省百千万人才工程资助项目(2021921100);辽宁省科学事业公益研究基金项目(2022JH4/10100111)。

摘　　要：冻融过程不仅直接影响非生长季节的磷循环,而且频繁冻融对生态系统的影响将持续到下一个生长季节。为研究冻融作用对河岸缓冲带土壤磷素迁移的影响,以河岸植被缓冲带土壤作为研究对象,室内模拟冻融环境,探究冻融条件下,土壤对磷素吸附行为,将待测样离心过滤后取一定体积液体测其浓度,分别计算出1,2,3,4,5次冻融循环中土壤对磷的吸附量,绘制等温吸附关系曲线并将吸附数据用Langmuir和Freundlich等温方程进行拟合;并分析在不同含水率、不同深度与冻融周期下,土壤中速效磷含量变化情况,将20 cm和40 cm深度的土壤饱和质量含水率控制为70%、75%、80%,经过5个周期的冻融后,分别测定土壤内的速效磷含量,并探讨磷素在河岸带土壤中发生的吸附和垂向迁移行为。结果表明:在平衡浓度0~30 mg·L^(-1)范围内,土壤对磷的吸附量随着溶液中磷浓度的增加而增加,磷溶液浓度大于30 mg·L^(-1)时,吸附达到平衡,对速效磷的最大吸附量为714.26 mg·kg^(-1);随着冻融周期的增加,土壤对速效磷的吸附量逐渐降低,5次冻融结束后的土壤对速效磷的吸附量与对照相比最大减少53.8%,其等温吸附过程符合Langmuir方程;河岸缓冲带土壤对磷的吸附量受土层深度及土壤含水率的影响,经5次冻融周期后,含水率相同时浅层土壤速效磷含量与初始值相比最大减少34.5%;与对照相比,深层土壤含水率为80%时速效磷含量减少3.23 mg·kg^(-1);浅层土壤含水率为70%时速效磷含量最大,减少0.81 mg·kg^(-1)。The freeze-thaw process not only directly affects the phosphorus cycle in the non-growing season,but also the effects of frequent freeze-thaw on the ecosystem will continue into the next growing season.In order to study the effect of freeze-thaw action on phosphorus migration in the soil of riparian buffer zone,this study took the soil of riparian vegetation buffer zone as the research object and simulated the freeze-thaw environment indoors to explore the adsorption behavior of soil phosphorus under freeze-thaw conditions.After centrifuging and filtering the samples to be tested,a certain volume of liquid was taken to measure its concentration,and the adsorption amount of soil phosphorus in 1,2,3,4,and 5 freeze-thaw cycles was calculated respectively.The isothermal adsorption curves were drawn and the adsorption data were fitted by Langmuir and Freundlich isothermal equations.The change of available phosphorus content in soil under different moisture content,different depths and freeze-thaw cycles was analyzed.The saturated mass moisture content of soil at 20 cm and 40 cm depth was controlled to 70%,75% and 80%.After 5 cycles of freezethaw,the available phosphorus content in soil was determined respectively.The adsorption and vertical migration behavior of P in riparian soil was also discussed.The results showed that in the range of equilibrium concentration 0-30 mg·L^(-1),the adsorption capacity of soil P increased with the increase of the concentration of P in solution.When the concentration of P solution was greater than 30 mg·L^(-1),the adsorption capacity reached equilibrium,and the maximum adsorption capacity of available P was 714.26 mg·kg^(-1).With the increase of freeze-thaw period,the adsorption amount of available phosphorus in soil gradually decreased,and the adsorption amount of available phosphorus in soil after five freeze-thaw periods decreased by 53.8% compared with the control,and the isothermal adsorption process was consistent with Langmuir equation.The phosphorus adsorption capacity of th

关 键 词：河岸缓冲带 磷素 迁移 冻融作用 吸附 

分 类 号：X53[环境科学与工程—环境工程]