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酸雨对土壤有机碳氮潜在矿化的影响
作者姓名:OUYANG Xue-Jun  ZHOU Guo-Yi  HUANG Zhong-Liang  LIU Ju-Xiu  ZHANG De-Qiang  LI Jiong
作者单位:[1]South China Botanic Garden, Chinese Academy of Sciences, Guangzhou 510650 (China) [2]Graduate School of the Chinese Academy of Sciences, Beijing 100049 (China)
基金项目:中国科学院知识创新工程项目,国家自然科学基金
摘    要:Acid rain is a serious environmental problem worldwide. In this study, a pot experiment using forest soils planted with the seedlings of four woody species was performed with weekly treatments of pH 4.40, 4.00, 3.52, and 3.05 simulated acid rain (SAR) for 42 months compared to a control ofpH 5.00 lake water. The cumulative amounts of C and N mineralization in the five treated soils were determined after incubation at 25 ℃ for 65 d to examine the effects of SAR treatments. For all five treatments, cumulative CO2-C production ranged from 20.24 to 27.81 mg kg^-1 dry soil, net production of available N from 17.37 to 48.95 mg kg^-1 dry soil, and net production of NO3-N from 9.09 to 46.23 mg kg^-1 dry soil. SAR treatments generally enhanced the emission of CO2-C from the soils; however, SAR with pH 3.05 inhibited the emission. SAR treatments decreased the net production of available N and NO3-N. The cumulative CH4 and N2O productions from the soils increased with increasing amount of simulated acid rain. The cumulative CO2-C production and the net production of available N of the soil under Acmena acuminatissima were significantly higher (P 〈 0.05) than those under Schima superba and Cryptocarya concinna. The mineralization of soil organic C was related to the contents of soil organic C and N, but was not related to soil pH. However, the overall effect of acid rain on the storage of soil organic matter and the cycling of important nutrients depended on the amount of acid deposition and the types of forests.

关 键 词:森林土壤  矿化作用  有机碳  有机氮

Effect of simulated acid rain on potential carbon and nitrogen mineralization in forest soils
OUYANG Xue-Jun,ZHOU Guo-Yi,HUANG Zhong-Liang,LIU Ju-Xiu,ZHANG De-Qiang,LI Jiong.Effect of simulated acid rain on potential carbon and nitrogen mineralization in forest soils[J].Pedosphere,2008,18(4):503-514.
Authors:OUYANG Xue-Jun  ZHOU Guo-Yi  HUANG Zhong-Liang  LIU Ju-Xiu  ZHANG De-Qiang and LI Jiong
Institution:South China Botanic Garden, Chinese Academy of Sciences, Guangzhou 510650 (China). E-mail: ouyxj@scib.ac.cn;Graduate School of the Chinese Academy of Sciences, Beijing 100049 (China);South China Botanic Garden, Chinese Academy of Sciences, Guangzhou 510650 (China). E-mail: ouyxj@scib.ac.cn;South China Botanic Garden, Chinese Academy of Sciences, Guangzhou 510650 (China). E-mail: ouyxj@scib.ac.cn;South China Botanic Garden, Chinese Academy of Sciences, Guangzhou 510650 (China). E-mail: ouyxj@scib.ac.cn;South China Botanic Garden, Chinese Academy of Sciences, Guangzhou 510650 (China). E-mail: ouyxj@scib.ac.cn;South China Botanic Garden, Chinese Academy of Sciences, Guangzhou 510650 (China). E-mail: ouyxj@scib.ac.cn
Abstract:Acid rain is a serious environmental problem worldwide. In this study, a pot experiment using forest soils planted with the seedlings of four woody species was performed with weekly treatments of pH 4.40, 4.00, 3.52, and 3.05 simulated acid rain (SAR) for 42 months compared to a control of pH 5.00 lake water. The cumulative amounts of C and N mineralization in the five treated soils were determined after incubation at 25 ℃ for 65 d to examine the effects of SAR treatments.For all five treatments, cumulative CO2-C production ranged from 20.24 to 27.81 mg kg-1 dry soil, net production of available N from 17.37 to 48.95 mg kg-1 dry soil, and net production of NO-3-N from 9.09 to 46.23 mg kg-1 dry soil. SAR treatments generally enhanced the emission of CO2-C from the soils; however, SAR with pH 3.05 inhibited the emission.SAR treatments decreased the net production of available N and NO3-N. The cumulative CH4 and N2O productions from the soils increased with increasing amount of simulated acid rain. The cumulative CO2-C production and the net production of available N of the soil under Acmena acuminatissima were significantly higher (P≤0.05) than those under Schima superba and Cryptocarya concinna. The mineralization of soil organic C was related to the contents of soil organic C and N, but was not related to soil pH. However, the overall effect of acid rain on the storage of soil organic matter and the cycling of important nutrients depended on the amount of acid deposition and the types of forests.
Keywords:forest soils  mineralization  organic C  organic N  simulated acid rain
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