Land Management Effects on Biogeochemical Functioning of Salt-Affected Paddy Soils

C.QUANTIN; O.GRUNBERGER; N.SUVANNANG; E.BOURDON

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Land Management Effects on Biogeochemical Functioning of Salt-Affected Paddy Soils

机译：土地管理对盐渍化水稻土生物地球化学功能的影响

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Most lowlands in Northeast Thailand (Isaan region) are cultivated with rice and large areas are affected by salinity,which drastically limits rice production.A field experiment was conducted during the 2003 rainy season to explore the interactions between salinity and land management in two fields representative of two farming practices:an intensively managed plot with organic inputs and efficient water management,and one without organic matter addition.Field measurements,including pH,Eh,electrical conductivity (EC),and soil solution chemistry,were performed at three depths,with a particular focus on Fe dynamics,inside and outside saline patches.High reducing conditions appeared after flooding particularly in plots receiving organic matter and reduction processes leading to oxide reduction and to the release of Fe and,to a lesser extend,Mn to the soil solution.Oxide reduction led to the consumption of H+ and the more the Fe reduction was,the higher the pH was,up to 6.5.Formation of hydroxy-green rust were likely to be at the origin of the pH stabilization.In the absence of organic amendments,high salinity prevented the establishment of the reduction processes and pH value remained around 4.Even under high reduction conditions,the Fe concentrations in the soil solution were below commonly observed toxic values and the amended plot had better rice production yield.

机译：泰国东北部（Isaan地区）的大多数低地都种植水稻，并且大部分地区都受到盐分的影响，这严重限制了水稻的生产.2003年雨季期间进行了田间试验，以探讨两个盐田中盐分与土地管理之间的相互作用两种耕作方法中的一种：在一个集约化管理的小区中进行有机投入并进行有效的水管理，一个不添加有机物。在三个深度进行了包括pH，Eh，电导率（EC）和土壤溶液化学在内的实地测量水淹后出现了很高的还原条件，特别是在接受有机物和还原过程导致氧化还原和铁释放的锰，以及较小程度地向土壤溶液中释放锰的土地上。氧化还原导致H +的消耗，Fe还原越多，pH值越高，可达6.5。在没有有机改性剂的情况下，高盐度阻止了还原过程的建立，并且pH值保持在4左右。即使在高还原条件下，铁中的Fe浓度也很高。土壤溶液的毒性低于通常观察到的毒性值，修正后的地块具有更好的水稻产量。

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《土壤圈（英文版）》 |2008年第2期|183-194|共12页
作者
C.QUANTIN; O.GRUNBERGER; N.SUVANNANG; E.BOURDON;
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作者单位

UMR 8148 IDES,Université Paris-Sud-CNRS,B(a)t.504,F-91405 Orsay Cedex (France);

Land Department Development,Office of Science for Land Development,Phaholyothin Road,Chatuchak,10900 Bangkok (Thailand);

UR Solutions,Maison des Sciences de l'Eau de Montpellier,IRD,av.E.Gendreau,F-34095 Montpellier cedex (France);

Land Department Development,Office of Science for Land Development,Phaholyothin Road,Chatuchak,10900 Bangkok (Thailand);

UR Solutions,Maison des Sciences de l'Eau de Montpellier,IRD,av.E.Gendreau,F-34095 Montpellier cedex (France);

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
field experiment,pH regulation,redox processes,salt-affected paddy soils,soil management;

机译：田间试验;pH调节;氧化还原过程;受盐影响的稻田土壤;土壤管理;

Land Management Effects on Biogeochemical Functioning of Salt-Affected Paddy Soils

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