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Soil Phosphorus Dynamics as Influenced by Land Use Changes in Humid Tropical, Southwest China

Pedosphere 2005年第1期15卷 24-32页

作者： YANGJing-Cheng HUANGJian-Hui PANQing-Min TANGJian-Wei HANXing-Guo LaboratoryofQuantitativeVegetationEcology InstituteofBotanyChineseAcademyofSciencesBeijing1000g3China LaboratoryofQuantitativeVegetationEcology InstituteofBotanyChineseAcademyofSciencesBeijing1000g3China／／BeijingNaturalHistoryMuseumBeijing100050China XishuangbannaTropicalBotanicalGarden ChineseAcademyofSciencesYunnan666303China

Land use changes can greatly influence soil phosphorus (P) dynamics, especially when converting native forests to agricultural land. Soils in Xishuangbanna, which is one of southwest China s tropical areas that maintain fragments of primary forests, were studied to a) evaluate the effect of two common land use changes, conversion of forests to agricultural land or rubber tree plantation, on the dynamics of available P and total P in bulk soils as well as total P in particle size fractions; b) assess the rel…

关键词： BRAZILIAN AMAZON ORGANIC-MATTER nutrient pools DEFORESTATION FRACTIONS PHOSPHATE BIOMASS LOSSES FIRE

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Fertility and biochemical activity in sodic soils 17 years after reclamation with flue gas desulfurization gypsum

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Journal of Integrative Agriculture 2021年第12期20卷 3312-3322页

作者： ZHAO Yong-gan WANG Shu-juan LIU Jia ZHUO Yu-qun LI Yan ZHANG Wen-chao Department of Energy and Power Engineering Tsinghua UniversityBeijing 100084P.R.China Beijing Engineering Research Center for Ecological Restoration and Carbon Fixation of Saline-Alkaline and Desert Land Beijing 100084P.R.China Shanxi Research Institute for Clean Energy Tsinghua UniversityTaiyuan 030032P.R.China Tsinghua Agriculture Co. Ltd.Beijing 100084P.R.China

Previous studies have mainly focused on changes in soil physical and chemical properties to evaluate the reclamation of sodic soils using flue gas desulfurization(FGD)***,information on the effects of this reclamation method on microbial-based indicators of soil quality is limited,particularly after many years of FGD gypsum *** study aimed to investigate the long-term effects of FGD gypsum on soil organic carbon(SOC),nutrients,microbial biomass and enzyme *** were collected from soils of three exchangeable sodium percentage(ESP)classes(i.e.,low-,middle-and hjgh-ESP classes of 6.1-20,20-30 and 30-78.4%,respectively)17 years after FGD gypsum treatment in Inner Mongolia,*** across the three ESP classes,FGD gypsum application increased the SOC contents at the 0-20 and 20-40-cm soil depths by 18 and 35%,respectively,and increased available potassium at the 0-20-cm soil depth by 51%compared with the no-gypsum *** microbial biomass carbon and microbial biomass nitrogen contents at the 20-40-cm soil depth increased by 69 and 194%,respectively,under FGD *** in the high-ESP class,urease activities in the 0-40 cm soil profile were significantly higher in the FGD gypsum treatments than in the controls.A significant increase in alkaline phosphatase activity was concentrated in the 20-40 cm soil layer;few classes showed significant increases in catalase and invertase activities in the 0-20 cm soil *** correlation analysis showed that increases in soil fertility and biological activity could be attributed to reductions in electrical conductivity,pH and ESP caused by FGD gypsum *** results confirm that FGD gypsum application is a viable strategy for reclaiming sodic soils due to its positive effects on soil fertility and biochemistry and that it may contribute to soil ecosystem sustainability.

关键词： gypsum organic carbon nutrient pools microbial biomass enzyme activity

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Soil chemical fertility change over four decades in the Morvan Mountains and influence of tree species (Burgundy, France)

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Forest Ecosystems 2022年第4期9卷 460-474页

作者： Margaux Clesse Arnaud Legout Jacques Ranger Bernd Zeller Gregory van der Heijden INRAE BEFF-54000NancyFrance

Background: Intensive silvicultural practices and the planting of monospecific forests of coniferous, that are more productive compared to hardwoods may threaten over the mid to long-term the sustainability of soil chemical fertility of forest ecosystems, and are a major concern for forest managers and ***: We investigated the tree species effect(Quercus sessiliflora Smith, Fagus sylvatica L., Picea abies Karst.,Pseudotsuga menziesii Mirb. Franco., Abies nordmanniana Spach. and Pinus nigra Arn. ssp. laricio Poiret var. corsicana) on the change over time of soil chemical properties and nutrient pool sizes in the mineral and organic layers of the soil during the 45 years after the plantation of the Breuil-Chenue common garden experiment(Burgundy,France). The organic and mineral soil layers down to 70-cm depth were sampled in the different monospecific plots in 1974, 2001 and ***: Exchangeable Ca and Mg pools and soil pH increased on average over time in the 0–70 cm soil profile in most stands. However, in the topsoil layers(0–15 cm), the decrease of pH, the increase of exchangeable acidity over time under the coniferous stands and the decrease of exchangeable K pools in most stands highlighted that soil acidification is still on-going at Breuil-Chenue site but the intensity of this process depends on the tree ***, three groups of species could be distinguished: i) Nordmann fir(Abies nordmanniana Spach.)/Norway spruce(Picea abies Karst.) where acidolysis and chelation occurred, resulting in the most pronounced pH decrease in the topsoil, ii) Douglas fir(Pseudotsuga menziesii Mirb. Franco.)/Laricio pine(Pinus nigra Arn. ssp. laricio Poiret var. corsicana) where acidification caused by elevated nitrification rates is probably currently compensated by larger weathering and/or atmospheric depositions fluxes, and iii) oak(Quercus sessiliflora Smith)/beech(Fagus sylvatica L.) where soil acidification was less intense. Counterintuitively, soil a

关键词： nutrient pools Tree species Acidification Podzolisation Recovery Ecosystem services

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