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Plateau Marsh Methane Oxidation as affected by inorganic n

Pedosphere 2004年第2期14卷 195-204页

作者： WAnGZhi-Ping DUAnYi YAnGJu-Rong LILing-Hao HAnXing-Guo LaboratoryofQuantitativeVegetationEcology InstituteofBotanyChineseAcademyofSciencesBeijing100093（China）／E-mail：wangzp5@*** StateKeyLaboratoryofGasGeochemistry LanzhouInstituteofGeology.ChineseAcademyofSciencesLanzhou730000（China） CollegeofResourceandEnvironment BEijingNormailUniversityBeijing100875（China）

In a series of laboratory incubations using soils of two contrasting sitesfrom a temperate marsh on the Qinghai-Tibet Plateau, potential methane (CH_4) oxidation rates weremeasured to study the effects of inorganic n inputs on CH_4 oxidation. For adrained site, subsurfacepeat (5--15 cm) at an initial 20 mu L CH_4 L^(-1) showed a significantly different (P n rate compared to other soil depths, with a maximal rate of 20.9 ng CH_4 gDW (dryweight)^(-1) h^(-1); the underlying mineral soil layers (15--30 and 30--50 cm) also had a strongCH_4 oxidation capacity at about an initial 2 000 mu L CH_4 L^(-1). With a waterlogged site, theCH_4 oxidation rate in an aerobic incubation was significantly greater (P n the surfacesoil layer (0--5 cm) compared to the 15--30 and 30--50 cm depths. There was generally no or a veryweak effect from addition of nO_3^- on CH_4 oxidation. In marked contrast, nH_4^+ salts, such as(nH_4)_2SO_4, nH_4Cl and nH_4nO_3, exhibited strong inhibitions, which varied as a function of theadded salts and the initial CH_4 level Increasing nH_4^+ usually resulted in greater inhibition andincreasing initial CH_4 concentrations resulted in less nH_4^+ inhibition on CH4 oxidation innatural high-altitude, low-latitude wetlands could be as important as has been reported foragricultural and forest soils. The nH_4^+ effects on the CH_4 oxidation rate need to be furtherinvestigated in a wide range of natural wetland soil types.

关键词： ammonium inhibition inorganic n methane oxidation plateau marsh

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Effect of n and P addition on soil organic C potential mineralization in forest soils in South China

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Journal of Environmental Sciences 2008年第9期20卷 1082-1089页

作者： OUYAnG, Xuejun ZHOU, Guoyi HUAnG, Zhongliang ZHOU, Cunyu LI, Jiong SHI, Junhui ZHAnG, Deqiang South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China College of Horticulture and Gardening Yangtze University Jingzhou 434025 China Xinjiang Academy of Forest Sciences Urumqi 830002 China

Atmospheric nitrogen deposition is at a high level in some forests of South China. The effects of addition of exogenous n and P on soil organic carbon mineralization were studied to address: (1) if the atmospheric n deposition promotes soil C storage through decreasing mineralization; (2) if the soil available P is a limitation to organic carbon mineralization. Soils (0–10 cm) was sampled from monsoon evergreen broad-leaved forest (MEBF), coniferous and broad-leaved mixed forest (CBMF), and Pinus massoniana...

关键词： addition inorganic n available P mineralization soil organic C South China

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Changes in Soil Physicochemical Properties Following Land Use Change from Paddy Fields to Greenhouse and Upland Fields in the Southeastern Basin of Dianchi Lake,Yunnan Province,China

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Pedosphere 2013年第2期23卷 169-176页

作者： n.MORITSUKA T.nISHIKAWA S.YAMAMOTO n.MATSUI H.InOUE LI Kun-Zhi T.InAMURA Laboratory of Plant Production Systems Graduate School of AgricultureKyoto University Kagoshima University KAnSO Technos Kunming University of Science and Technology

Paddy fields in the southeastern basin of Dianchi Lake have rapidly changed to greenhouses since 1999. A total of 61 surface soil samples, including 43 greenhouse soils, 12 upland soils, and 6 paddy soils, were collected from a flat lowland area mainly used for agricultural production fields in the southeastern basin of Dianchi Lake. Analyses of the soil samples indicated that the greenhouse soils were characterized by a lower organic matter content, lower pH, and higher soluble nutrients than the paddy soils in the area. The lower organic matter content of the greenhouse soils was ascribed to environmental or management factors rather than the clay content of the soil. Accumulation of soluble nutrients, especially inorganic n, was due to over-application of fertilizers, which also caused soil acidification. The average amount of readily available n, P, and K accumulated in the greenhouse soils was estimated to be equal to or higher than the annual input of these nutrients as a fertilizer, indicating that a reduction in fertilizer application was possible and recommended. In contrast, a very low available Si content was observed in the paddy soils, suggesting the need for Si application for rice production.

关键词： available Si greenhouse soils inorganic n phosphorus salinization

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Amendment of Acid Soils with Crop Residues and Biochars

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Pedosphere 2011年第3期21卷 302-308页

作者： YUAn Jin-Hua XU Ren-Kou WAnG ning LI Jiu-Yu State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing210008 (China) Graduate University of Chinese Academy of Sciences Beijing 100049 (China)

The liming potential of some crop residues and their biochars on an acid Ultisol was investigated using incubation experiments. Rice hulls showed greater liming potential than rice hull biochar, while soybean and pea straws had less liming potential than their biochars. Due to their higher alkalinity, biochars from legume materials increased soil pH much compared to biochars from non-legume materials. The alkalinity of biochars was a key factor affecting their liming potential, and the greater alkalinity of biochars led to greater reductions in soil acidity. The incorporation of biochars decreased soil exchangeable acidity and increased soil exchangeable base cations and base saturation, thus improving soil fertility.

关键词： alkalinity exchangeable base cations inorganic n liming potential soil acidity

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Correlation Between CO_2 Efflux and net nitrogen Mineralization and Its Response to External C or n Supply in an Alpine Meadow Soil

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Pedosphere 2011年第5期21卷 666-675页

作者： SOnG Ming-Hua JIAnG Jing XU Xing-Liang SHI Pei-Li Key Laboratory of Ecosystem network Observation and Modelling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 (China) State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 (China) Graduate University of Chinese Academy of Sciences Beijing 100049 (China)

In nutrient-limited alpine meadows,nitrogen(n) mineralization is prior to soil microbial immobilization;therefore,increased mineral n supply would be most likely immobilized by soil microbes due to nutrient shortage in alpine *** addition,low temperature in alpine meadows might be one of the primary factors limiting soil organic matter decomposition and thus n mineralization.A laboratory incubation experiment was performed using an alpine meadow soil from the Tibetan *** levels of nH4nO3(n) or glucose(C) were added,with a blank without addition of C or n as the control,before incubation at 5,15,or 25 ℃ for 28 ***2 efflux was measured during the 28-d incubation,and the mineral n was measured at the beginning and end of the incubation,in order to test two hypotheses:1) net n mineralization is negatively correlated with CO2 efflux for the control and 2) the external labile n or C supply will shift the negative correlation to *** results showed a negative correlation between CO2 efflux and net n immobilization in the *** inorganic n supply did not change the negative *** external labile C supply shifted the linear correlation from negative to positive under the low C addition ***,under the high C level,no correlation was *** suggested that the correlation of CO2 efflux to net n mineralization strongly depend on soil labile C and C:n ratio regardless of *** research should focus on the effects of the types and the amount of litter components on interactions of C and n during soil organic matter decomposition.

关键词： C:n ratio inorganic n labile C organic matter temperature

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