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• W2314463203 abstract "PDF HTML阅读 XML下载 导出引用 引用提醒 不同隔盐措施对滨海盐碱地土壤水盐运移及刺槐光合特性的影响 DOI: 10.5846/stxb201403090402 作者: 作者单位: 北京林业大学林学院,北京林业大学林学院,北京林业大学林学院,北京林业大学林学院,北京林业大学林学院,呼伦贝尔市林业科学研究所 作者简介: 通讯作者: 中图分类号: 基金项目: 北京市自然科学基金(2122044); 国家十一五科技支撑计划课题(2009BADB2B0504). Application of salt-isolation materials to a coastal region: effects on soil water and salt movement and photosynthetic characteristics of Robinia pseudoacacia Author: Affiliation: Beijing Forestry University,Beijing Forestry University,,,, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:土地盐碱化是限制土地资源利用的一个主要障碍,在耕地面积逐渐减少的今天,改良利用盐碱地早已提上了科学日程。在天津滨海盐碱地区,通过田间完全随机区组实验设计,对比分析了4种土壤盐分隔离措施(对照-不设隔盐处理,CK;沸石隔盐处理,FS;陶粒隔盐处理,TL;河沙隔盐处理,HS)对0-80 cm土层水盐运移及刺槐(Robinia pseudoacacia)光合特性的影响,目的是通过评估不同隔盐材料的控盐改土效果,为滨海地区盐渍土改良和沿海防护林营造等林业生态工程建设提供理论依据。研究结果表明:(1) FS和TL可以显著提高土壤相对水分含量,为刺槐生长创造更加适宜的水分环境。FS导致0-80 cm土体内盐分含量和土壤盐溶质浓度显著降低,控盐效果显著。TL仅在40 cm以下土层有显著降盐效果,控盐效果仅次于FS。与对照相比,HS对0-80 cm土体内盐分含量和土壤盐溶质浓度无显著影响,降盐效果最差。(2) FS处理能显著提高刺槐的净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)及叶片水分利用效率(LWUE),降低胞间CO2浓度(Ci)。TL可显著提高刺槐叶片的Pn、Tr,但改善效果不及FS,并且其对Gs、Ci和LWUE没有显著影响。与对照相比,HS虽然能显著增加刺槐叶片Pn和Tr,但却导致LWUE显著降低。综上所述,在滨海地区采用沸石作为隔盐材料比采用传统材料河沙更能有效保水降盐,促进植物光合及生长,可以作为滨海盐碱地区隔盐材料的优先选择。 Abstract:Soil salinization is a major obstacle to the optimal utilization of land resources. Salt-affected soils are widely distributed throughout the world. The present extent of salt-affected soils substantially restricts plant growth in these areas. It has been demonstrated that leaching with water, chemical amendment, surface mulching with straw and phytoremediation are the most often used approaches to ameliorate saline soils. Engineering measures are also an effective solution to control salt movement in the saline soil. Establishing salt-isolation interlayers beneath the surface of saline soil is one of the most widely used engineering measures. Even though there are many studies dealing with salt-isolation interlayers establishment, very little is known about their effects on saline soil. Here, we used three salt-isolation materials to restrict the water and salt movements in saline soil: zeolite, ceramsite and river sand. The aim of this study was to assess the effects of salt-isolation interlayers application on soil water and salt movements in saline soil and on the photosynthetic characteristics of Robinia pseudoacacia in the coastal regions of Tianjin city. We also anticipate that the outcome of the study could form part of the basis for selection of salt-isolation materials in improving coastal saline soil with consideration of their costs. The research was conducted from April 2010 to August 2013 at the Coastal Salt-tolerant Plant Science and Technology Park, Dagang, Tianjin, China. An experiment was conducted with four treatments:(1) No addition of slat-isolation interlayer (CK); (2) Addition of zeolite (FS) at the bottom and side walls of the planting sites; (3) Addition of ceramsite (TL) at the bottom and side walls of the planting sites; (4) Addition of river sand (HS) at the bottom and side walls of the planting sites. All treatments were arranged in a randomized complete block design with four blocks. Each block was again divided into four plots. The four treatments were randomly assigned to each plot within the individual blocks with a separate randomization for each block. The salt-isolation materials were added to nine planting sites in each plot. The nine sites were evenly distributed based on a planting spacing of 3 m× 3 m. Each planting site was 1 m× 1 m× 1 m. The results indicated: (1) Salt-isolation interlayers could significantly increase soil water content of tree planting site. FS treatment performed best and had the lowest salt content and salt solute concentration, followed by TL. Relative to the CK, HS had no significant effects on salt content and salt solute concentration. (2) FS treatment significantly increased the leaf photosynthetic rate (Pn), transpiration rate (Tr), stomata conductance (Gs) and leaf water use efficiency (LWUE), and reduced intercellular CO2 concentration (Ci). TL treatment can also significantly enhance Pn、Tr, but it had no significant effects on Gs、Ci and LWUE. HS treatment had significantly increased Pn and Tr, and reduced LWUE. We concluded that the zeolite was an optimal salt-isolation material in controlling salt movement in saline soil and improving tree growth in the coastal regions. 参考文献 相似文献 引证文献" @default.
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• W2314463203 title "Application of salt-isolation materials to a coastal region: effects on soil water and salt movement and photosynthetic characteristics of<i>Robinia pseudoacacia</i>" @default.
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