种植盐地碱蓬修复滨海盐渍土效果的研究   总被引：25，自引：0，他引：25  

林学政  沈继红  刘克斋  黄晓航 《海洋科学进展》2005,23(1):65-69

利用盐生植物——盐地碱蓬进行天津河口滨海盐碱地的生物修复。通过比较种植盐地碱蓬土壤和对照土壤的电导率、有机质和微生物数量的差异等研究了其修复效果。结果表明，种植区碱蓬根际土壤的电导率与对照土壤相比下降了13％；有机质和总氮与对照土壤相比分别增加43％和18％；根际土壤的微生物数量明显增加，放线菌和真菌分别比对照增加了5倍和16倍。根际微生物优势种群的盐耐受性结果显示，部分根际土壤的优势种群的盐耐受性明显下降，耐盐性较低的微生物种群已成为优势种群。以上结果表明，种植盐地碱蓬对改善滨海盐碱地的生态有明显的效果。  相似文献   

一种改进的周跳多项式拟合方法   总被引：8，自引：3，他引：5  

李明  高星伟  徐爱功 《测绘科学》2008,33(4)

多项式拟合探测周跳受相位观测值所含误差的影响,随着采样数的增加,其探测周跳的能力随之降低,通常将观测数据分成若干段来进行处理。这样不可避免的增加工作强度,降低工作效率。本文根据多项式拟合探测周跳的基本原理,对多项式进行改进。经实验证明,利用改进后的多项式进行拟合能够有效地弥补传统方法的不足,使周跳的探测与修复更加稳定可靠。  相似文献   

非开挖管道翻转内衬修复技术的探讨     

程剑雄  王瑞  张淑洁 《岩土钻凿工程》2008,(4):34-36

本文重点介绍了翻转内衬修复技术的原理、工序、技术特点等,并概括介绍了其它几种非开挖修复技术修复城市燃气埋地管道的方法,最后展望了翻衬法的应用及推广前景。  相似文献   

英国排水管道修复新技术     

Ian  ;Clarke编著  ;王希全译 《岩土钻凿工程》2008,(1):145-147

德国与英国的管道修复公司合作开发出一种称为Epros SeaLiner的原位固化法管道修复技术,其包括衬管材料、特制树脂和技术工艺。应用该技术能在地下水渗入破损管道的条件下施工,可靠密封衬管与宿主管之间环状间隙和枝管重开处的接头,彻底克服内衬修复及接口重开所致的渗漏问题。  相似文献   

利用GPS组合观测值探测与修复周跳算法实现     

袁本银  高成发  陈春花 《测绘科学》2008,(Z1)

本文在目前常用的周跳探测和修复方法的基础上,根据相位减伪距组合,Melbourne-Wübbena组合,电离层残差组合三种GPS组合观测值优缺点互补,将这三种组合观测值有机结合产生可靠的探测与修复周跳算法并用程序实现,通过实例分析证明此算法能够探测和修复任意大小的周跳。  相似文献   

玻璃钢内衬法和管道修复技术用于改善排水管网     

Ian  ;Clarke  ;范运林译  ;乌效鸣校 《岩土钻凿工程》2008,(5):27-29

本文叙述了玻璃钢内衬法和CIPP管道修复技术在地下排水管网改造中的作用,重点介绍了罗马尼亚的应用情况。  相似文献   

地下水土石油类污染修复技术途径   总被引：1，自引：1，他引：0  

齐硕  张蕾  张耀为 《世界地质》2008,27(3)

石油工业在开采、加工、运输、储备过程中石油及其初加工产品泄漏,进入环境造成污染。本文根据国内外现有异位修复技术和原位修复技术研究成果,提出“加强场地调查,有效控制污染源,阻断污染途径,同时开展受污染地下水土修复,优化组合多种修复技术方法”路线,表明可修复地下水土石油类有机污染。  相似文献   

Remediation and restoration of metal-contaminated sites： Concepts and appfications to mining areas     

Domy C. Adriano Hyo T. Chon Sally L. Brown Rosanna Ginocchio 《中国地球化学学报》2006,25(B08):45-46

Metals, including heavy metals and metalloids, are a common group of environmental contaminants. Their sources in the environment are geogenic or anthropogenic. The growing trend in global industrialization ensures that more metals could be dispersed even in pristine ecosystems. To fuel industrialization, more metal ore mines have to be discovered and explored. These explorations often result in landscape disturbance, soil degradation and environmental contamination by unwanted mining constituents. Mine tailings brought up to the ground surface often serve as the main source of contaminants when these pyrite-rich materials oxidize. The oxidation of mine tailings results in proton generation, coupled with the dissolution of metals and other cations Unwanted anionic constituents are also produced. The so-called ＂acid mine drainage＂ may affect the productivity of farmlands and stability of receiving streams and other bodies of water-acidifying the waters and enriching the ecosystem with metals, i.e., high total dissolved solids. The acidified overburden materials become inhospitable to plant and microbial life as they are typically low in organic matter content and infertile. This exposes the landscape to runoff and erosion.  相似文献   

A novel strategy using biodegradable EDDS for the chemically enhanced phytoextraction of soils contaminated with heavy metals   总被引：1，自引：0，他引：1  

Chunling LUO Zhenguo SHEN Alan J.M. Baker Xiangdong LI 《中国地球化学学报》2006,25(B08):115-115

For the sake of cost and potential environmental risk, it is necessary to minimize the amount of chelates used in chemically-enhanced phytoextraction. In the present study, a biodegradable chelating agent, EDDS was added in a hot solution at 90℃ to the soil in which garland chrysanthemum （Chrysanthemum coronarium L.） and beans （Phaseolus vulgaris L., white bean） were growing. The application of hot chelate solutions was much more efficient than the application of normal chelate solutions （25℃） in improving the uptake of heavy metals by plants. When 1 mmol kg1 of EDDS as a hot solution was applied to soil, the concentrations ofCu, Zn and Cd and the total phytoextraction by the shoots of the two plant species exceeded or approximated those in the shoots of plants treated with 5 mmol kg^-1 of normal EDTA solution. The concentrations of metals in the shoots of beans were significantly correlated with the relative electrolyte leakage rate of root cells, indicating that the root damage resulting from the hot solution might play an important role in the process of chelate-enhanced metal uptake. The soil leaching study demonstrated that decreasing the dosage of chelate resulted in decreased concentrations of soluble metals in soils. On the 28th day following the application of chelate, the concentrations of soluble metals in the EDDS treated soil were not significantly different from the concentrations in the control soil to which chelates had not been applied.  相似文献   

Metal contamination in southern Brazil vineyard softs     

《中国地球化学学报》2006,25(B08):120-120

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