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赵西梅,夏江宝,陈为峰,陈印平.蒸发条件下潜水埋深对土壤-柽柳水盐分布的影响.生态学报,2017,37(18):6074~6080 本文二维码信息
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蒸发条件下潜水埋深对土壤-柽柳水盐分布的影响
Effect of groundwater depth on the distribution of water and salinity in the soil-Tamarix chinensis system under evaporation conditions
投稿时间:2016-06-28  
DOI: 10.5846/stxb201606281276
关键词潜水埋深  水分  盐分  分布特征  柽柳  土壤
Key Wordsgroundwater depth  water  salt  distributional characteristics  Tamarix chinensis  soil
基金项目国家自然科学基金项目(31370702,31570522);山东省重点研发计划项目(2015GNC111022);滨州市科技发展计划项目(2011ZC0702);滨州学院博士学位人员科研启动项目(2014Y04);滨州学院科研基金项目(BZXYL1108)
作者单位E-mail
赵西梅 山东农业大学资源与环境学院, 泰安 271018;滨州学院山东省黄河三角洲生态环境重点实验室, 滨州 256603  
夏江宝 滨州学院山东省黄河三角洲生态环境重点实验室, 滨州 256603 xiajb@163.com 
陈为峰 山东农业大学资源与环境学院, 泰安 271018  
陈印平 山东农业大学资源与环境学院, 泰安 271018;滨州学院山东省黄河三角洲生态环境重点实验室, 滨州 256603  
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摘要:
盐水矿化度下模拟设置4个潜水埋深(0.9、1.2、1.5、1.8 m),分析不同土层的土壤相对含水量(RWC)、含盐量(SC)和土壤溶液绝对浓度(CS)等水盐参数,及柽柳叶片和新生枝条的含水量及Na+含量,探讨盐水矿化度下土壤-柽柳水盐参数对潜水埋深的响应规律。结果表明:各土层RWC与潜水埋深呈负相关,0.9 m潜水埋深下各土层的RWC均最高,且各土层RWC随土层深度的增加呈先降低后增加的趋势,其它潜水埋深下各土层RWC均逐渐增加,1.2 m是地下水所能上升且保持柽柳柱体土壤表层湿润的最高高度。各土层SCCS与潜水埋深呈抛物线型,均表现为先增加后降低,潜水埋深1.2 m时,各土层SC均最高。随土层深度的增加,各潜水埋深下SC先降低后增加,而CS呈现减少趋势;潜水埋深越高,土层间CS变化幅度越激烈。潜水埋深对柽柳叶片和新生枝条的含水量无显著影响(P > 0.05),而随潜水埋深的增加,柽柳叶片Na+含量逐渐增加,新生枝条Na+含量则先增加后降低。从整个柽柳土柱看,随潜水埋深的增加,整个土壤剖面的RWC均值逐渐降低,而SCCS均值先增加后降低,潜水埋深1.2 m是盐分变化的分界点,建议栽植柽柳的潜水埋深大于1.2 m。
Abstract:
In order to investigate the response of water and salt distribution in the Tamarix-soil system to groundwater depth under saline conditions, a soil column experiment was carried out with Tamarix chinensis planted under four treatments with different groundwater depths (0.9 m, 1.2 m, 1.5 m, and 1.8 m). The soil relative water content (RWC), soil salt content (SC), and absolute concentration of soil solution (CS) were determined in different profiles of water content and Na+ content of the leaves and new branches of T. chinensis. The RWC in each soil profile was negatively correlated with the groundwater depth, and the maximum values for each soil layer were observed in groundwater depth treatment that was 0.9 m deep. With the increase in soil depth, the RWC in this treatment increased initially and then decreased, while it constantly increased at other groundwater depths. The results showed that the 1.2 m groundwater depth treatment was the greatest depth to which water could reach and keep the soil surface moist in the soil column planted with T. chinensis. With the increase in groundwater depth, SC and CS of each soil profile increased initially and then decreased, displaying a parabola pattern, The maximum content at each soil layer was observed in the 1.2 m groundwater depth treatment. With the increase in soil depth, SC in all groundwater depth treatments decreased initially and then increased, while CS decreased gradually. The change range of CS between soil layers increased with the increase of groundwater depth. Significant differences were not observed (P>0.05) between the water content in either the leaves or new branches of Tamarix at different groundwater depths, while the content of Na+ in the leaves increased gradually and that in the new branches decreased after an initial increase. For the whole Tamarix-soil column, the mean of RWC decreased gradually with the increase in groundwater depth, whereas the mean of SC or CS increased initially followed by a decrease. The groundwater depth of 1.2 m is the demarcation point of salinity change, suggesting that the groundwater depth for Tamarix should be more than 1.2 m.
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