秸秆隔层对沿海垦区盐渍土淋洗过程影响的模拟  

Simulation of the effect of straw interlayer on the leaching process of saline soil in coastal reclamation area

作　　者：陆培榕 邢玮麟 罗纨[1] 贺园春 杨玉杰 吴慧 赵文宇 LU Peirong;XING Weilin;LUO Wan;HE Yuanchun;YANG Yujie;WU Hui;ZHAO Wenyu(College of Hydraulic Science and Engineering,Yangzhou University,Yangzhou 225009,China)

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225009

出　　处：《扬州大学学报（自然科学版）》2023年第2期19-28,共10页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52109068);中国博士后科学基金资助项目(2022M712690);江苏省博士后科研资助项目(2021K220B);扬州市科技计划资助项目(YZU202101)。

摘　　要：为探究淋洗过程中秸秆隔层对江苏沿海垦区盐渍土壤水盐运移的影响,开展灌水淋洗的土柱试验,采用HYDRUS-2D模型模拟两类秸秆隔层(纯秸秆、土壤-秸秆混合)在覆盖、浅埋及深埋的单层、双层及三层布设形式下盐渍土壤水盐运移分布特征.结果表明,覆盖+浅埋+深埋的三层布设形式对土壤剖面水分的维持效果最优,但此时土壤盐分淋洗程度相对较低;秸秆隔层布设可显著提高其上方土壤淋洗后的蓄水量,且纯秸秆隔层的保水效果优于土壤-秸秆混合隔层;单层布设形式在首轮淋洗过程中的排盐速率比双层和三层布设形式分别高11.76%和17.41%,但各类布设形式在次轮淋洗后的累计排盐总量基本一致,最大差异仅为0.74%.To explore the effect of the straw layers on the water-solute transports of saline soil in Jiangsu coastal reclamation area during leaching events,soil column test of irrigation leaching is carried out.The HYDRUS-2D model is used to simulate the transport and distribution characteristics of water and salt in saline soil under two types of straw interlayers(pure straw and soil-straw mixture)under single,double and three-layer combined arrangement in mulch,shallow and deep formations.The results show that the three-layer arrangement of mulch+shallow burial+deep burial has the best water maintenance effect on soil profile but presents a relatively lower soil salt leaching degree.The application of straw layer can significantly increase the water storage capacity of the soil above it after leaching event,and the water-retaining effect of pure straw interlayer is better than that of soil-straw interlayer.Additionally,the salt removal rate of single-layer layout is 11.76%and 17.41%higher than that of double-and triple-layer layout respectively during the first leaching event.However,the total amount of salt discharged by all kinds of layout after the second leaching event is basically the same,and the maximum difference is only 0.74%.

关 键 词：土柱试验 秸秆隔层 水盐运移 数值模拟 土壤盐分淋洗 

分 类 号：S278[农业科学—农业水土工程]