辽宁章古台不同土地利用方式风沙土钾素释放特征研究
收稿日期: 2023-05-15
修回日期: 2023-07-21
网络出版日期: 2023-10-16
基金资助
辽西北风沙区适生树（草）种遗传资源收集、评价与繁育技术研究(2021JH2/102000)
Study on Potassium Release Characteristics of Aeolian Sandy Soil Under Different Land Use Patterns in Zhanggutai,Liaoning Province
Received date: 2023-05-15
Revised date: 2023-07-21
Online published: 2023-10-16
明晰不同土地利用方式下土壤钾素释放的特征,对风沙土的土地利用和肥力的提升具有重要意义。采用室内模拟实验和方程拟合方法研究辽宁章古台地区土壤非交换性钾释放过程、影响因素及动力学特征,结果表明:土壤非交换性钾释放分为快速释放(18~<90 h)和缓慢释放(90~520 h)两个阶段,释放量普遍呈现0~<20 cm表层土壤大于20~40 cm底层土壤;不同土地利用对非交换性钾释放有积极作用,其中0~<20 cm土层,阔叶林的非交换性钾累积释放量最大,在20~40 cm土层则为水田最大;Elovich方程的决定系数R2为0.96~0.98,SE为0.97~2.78,是风沙土非交换性钾释放过程拟合最好的方程,其次是一级动力学方程,方程参数可以描述风沙土的供钾能力;表层土壤非交换性钾释放与土壤钾素含量密切相关,底层与土壤胶体含量有关。
曹怡立 , 张学利 , 吕刚 , 安宇宁 , 迟琳琳 , 刘洋 . 辽宁章古台不同土地利用方式风沙土钾素释放特征研究[J]. 林草资源研究, 2023 , 0(4) : 161 -168 . DOI: 10.13466/j.cnki.lyzygl.2023.04.019
Understanding the characteristics of soil potassium release under different land use patterns is highly significant for impoving land use and fertility in Aeolian sandy soil.This study used indoor simulation experiments and equation fitting methods to investigate the process,influencing factors and kinetic characteristics of non-exchangeable potassium in the soil in Zhanggutai area of Liaoning Province.The findings revealed two distinct stages of potassium release:rapid release(18~90hrs)and slow release(90~520hrs),with generally higher release in the 0~<20 cm depth compared to the 20~40 cm depth.Different land use types exhibited a positive impact on non-exchangeable potassium release.Specifically,the broad-leaved forest demonstrated the highest cumulative release in the 0~<20 cm soil layer,while the paddy field exhibited the highest release in the 20~40 cm soil layer.The Elovich equation yielded the best fit for the release process of non-exchangeable potassium in Aeolian sandy soil,with determination coefficients(R2)ranging from 0.96 to 0.98 and standard errors(SE)ranging from 0.97 to 2.78.The subsequent best fit was observed with the first-order kinetic equation,and the equation parameters accurately described the potassium supply capacity of Aeolian sandy soil.Non-exchangeable potassium release in the surface soil was closely correlated with soil potassium content,while in the subsoil,it was associated with soil colloid content.
Key words： soil improvement; land use; sandy soil; non-exchangeable potassium release; dynamics
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