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Carbon and nitrogen mineralization in soil of leguminous trees in a degraded pasture in northern Rio de Janeiro, Brazil

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Journal of Forestry Research 2016年第1期27卷 91-99页

作者： Danielle A. D. nunes Emanuela F. Gama-Rodrigues Patricia A. B. Barreto[ Antonio C. Gama-Rodrigue Paulo H. M. Monroe Chemistry School Rio de Janeiro Federal UniversityRio de Janeiro RJ 21941-909 Brazil Soil Laboratory North Fluminense State UniversityCampos dos Goytacazes RJ 28013-602 Brazil Department of Soil and Agricultural Engineering State University of Southwest Bahia Vitoda da ConquistaBA 45031-300 Brazil

Use of legume trees can improve soil quality in degraded pastures. The aim of this study was to charac- terize C and n mineralization kinetics and estimate the potentially mineralizable C and n in soil under Mimosa caesalpiniifolia Benth. and Acacia auriculiformis A. Cunn. ex Benth. secondary forest and pasture in red-yellow latosols in southeast Brazil. We conducted a laboratory aerobic incubation experiment using a completely ran- domized design of four replicates and four types of plant cover using a modified version of the Stanford and Smith technique （1972） to study C and n mineralization potential. Potentially mineralizable n （no） ranged from 135 to 170 mg kg-1. The predominant form of mineral n for all types of plant cover was n-nO3-. M. caesalpiniifolia was the only species that had a positive influence on n min- eralization. neither of the legumes influenced C mineral- ization in pasture or secondary forest. The model of n mineralization corresponded to a sigmoidal curve while C mineralization corresponded to an exponential curve, revealing that the n and C mineralization processes were distinct. n mineralized by M. caesalpiniifolia （216 kg ofn ha-1） was adequate to meet the n requirement for a livestock-forest system.

关键词： Carbon dioxide Forest soil mineralized n Organic matter Soil microorganisms

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Estimation of the Biological Methods of Assessing Soil n-Supplying Capacity in Calcareous Soil

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Agricultural Sciences in China 2007年第10期6卷 1224-1234页

作者： JIn Fa-hui LI Shi-qing LU Hong-ling LI Sheng-xiu State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A＆F University~Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water Resources Yangling 712100 P.R.China College of Resources and Environmental Sciences Northwest A＆F University Yangling 712100 P.R.China

Although many biological methods are used to determine soil nitrogen supplying capacity, there are certain differences in the results for different types of soils and various ways of measurement due to the complexity of soil n conformation, the high variance of soil and microorganism, and the difference of environment. Therefore, it is not clear about which biologic incubation method is better for calcareous soil. In this study, pot experiments were performed by using 25 different calcareous surface soil samples on the Loess Plateau and taking the n uptake of wheat and corn with leaching soil initial nitrate and without leaching in pot experiments as the control to investigate the difference of eight biological incubation methods for reflecting soil nitrogen supply capacity. The eight biological methods are waterlogged incubation, aerobic incubation for 2 weeks and for 4 weeks, dry-wet alternation aerobic incubation for 2 weeks, long-term alternate leaching aerobic incubation （and n mineralization potential, no）, short-term leaching aerobic incubation, microbial biomass carbon （Bc）, and microbial biomass nitrogen （Bn） method, respectively. Among these methods, the dry-wet alternation aerobic incubation and aerobic incubation for 4 weeks were the modification of the method of aerobic incubation for 2 weeks according to the actual farmland moisture. The results showed that the correlation coefficients between these methods and crop uptake n with leaching soil initial nitrate were 0.530, 0.700, 0.777, 0.768, 0.764 （and 0.790, no）, 0.650, 0.555, and 0.465, respectively （r0.05 = 0.369, r0.0l = 0.505）. While without leaching soil initial nitrate, their coefficients were 0.351, 0.963, 0.962, 0.959, 0.825 （and0.812, no）, 0.963, 0.289, and 0.095, respectively （r0.05 = 0.369, r0.01 = 0.505）. In conclusion, excluding the soil initial nitrate, the correlation coefficients between the eight methods and crop uptake n were, from high to low, n0, aerobic incubation for 4 weeks, dry

关键词： soil nitrogen supplying index biological methods mineralized n

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