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

Pedosphere 2008年第2期18卷 183-194页

作者： c.quantin umr 8148 ides O.GRUNBERGER N.SUVANNANG E.BOURDON Université Paris-Sud-cNRS Land Department Developement Office of Science for Land Developement Phaholyothin RoadChatuchak UR Solutions Maison des Sciences de l'Eau de Montpellier IRDav.E.Gendreau

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 *** 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 *** reduction led to the consumption of H^+ and the more the Fe reduction was,the higher the pH was,up to *** of hydroxy-green rust were likely to be at the origin of the pH *** the absence of organic amendments,high salinity prevented the establishment of the reduction processes and pH value remained around *** 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.

关键词： field experiment pH regulation redox processes salt-affected paddy soils soil management

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Microbial Activity Indices: Sensitive Soil Quality Indicators for Trace Metal Stress

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Pedosphere 2005年第4期15卷 409-416页

作者： LI Yong-Tao T. BEcQUER2 c. quantin M. BENEDETTI P. LAVELLE DAI Jun college of Natural Resources and Environment South China Agricutrual University Guangzhou 510642 （China） umr 137 Biodiversité et Fonctionnement des Sols Institut de Recherche Pour le Déueloppement （France） Université Paris Sud XI FRE Orsay Terre 2566 Bat 504 91405 Cedex （France） umr-cNRS 7047 Lab. de Géochimie et Métallogénie/Université Pierre et Marie Curie （France）

Physicochemical properties, total and DTPA （diethylenetriaminepentaacetic acid）-extractable cu, Zn, Pb and cd contents, microbial biomass carbon （c） content and the organic c mineralization rate of the soils in a long-term trace metal-contaminated paddy region of Guangdong, china were determined to assess the sensitivity of microbial indices to moderately metal-contaminated paddy soils. The mean contents of total cu, Zn, Pb and cd were 251, 250, 171, and 2.4 mg kg^-1 respectively. DTPA-extractable metals were correlated positively and significantly with total metals, cEc, and organic c （except for DTPA-extractable cd）, while they were negatively and highly significantly correlated with pH, totall Fe and Mn. Metal stress resulted in relatively low ratios of microbial biomass c to organic c and in remarkable inhibition of the microbial metabolic quotient and c mineralization rate, which eventually led to increases in soil organic c and c/N. Moreover, microbial respiratory activity showed a stronger correlation to DTPA-extractable metals than to total metal content. Likewise, in the acid paddy soils some “linked” microbial activity indices, such as metabolic quotient and ratios of basal respiration to organic c, especially during initial incubation, were found to be more sensitive indicators of soil trace metal contamination than microbial biomass c or basal respiration alone.

关键词： availability indication microbial characteristics trace metals

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