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章古台沙地松树人工林土壤无机氮、微生物生物量碳及微生物生物量氮
作者姓名:YU Zhan-Yuan  CHEN Fu-Sheng  ZENG De-Hui  ZHAO Qiong  CHEN Guang-Sheng
作者单位:[1]Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China). [2]Life College, Nanchang University, Nanchang 330029 (China) [3]Ecosystem Sciences and Regional Analysis (ESRA) Lab., School of Forestry &Wildlife Science, Auburn University, Alabama 36849 (USA)
基金项目:国家重点基础研究发展规划(973计划) , 中国科学院知识创新工程重要方向性项目 , Key Laboratory of Terrestrial Ecological Process and Regional Ecological Sfety in Liaoning Province
摘    要:The dynamics of soil inorganic nitrogen (NH4^+ -N and NO3^- -N) and microbial biomass carbon (Cmic) and nitrogen (Nmic) under 30-year-old fenced Pinus sylvestris L. var. mongolica Litvin (SF), unfenced P. sylvestris L. var. mongolica Litvin (SUF), and unfenced Pinus densiflora Siebold et Zucc. (DUF) plantations in the Zhanggutai sandy soil of China were studied during Apr. to Oct. 2004 by the in situ closed-top core incubation method. All mentioned C and N indices in each stand type fluctuated over time. The ranges of inorganic N, Cmic, and Nmic contents in the three stand types were 0.7-2.6, 40.0-128.9, and 5.4-15.2 μg g^-1, respectively. The average contents of soil NH4^+ -N and Cmic under the three 30-year-old pine plantations were not different. However, soil NO3^ -N and total inorganic N contents decreased in the order of SUF ≥ SF ≥ DUF, the Nmic content was in the order of SF = SUF 〉 DUF, and the Cmic:Nmic ratio was in the order of SUF = DUF 〉 SF. Seasonal variations were observed in soil inorganic N, microbial biomass, and plant growth. These seasonal variations had certain correlations with microbe and plant N use in the soil, and their competition for NH4^+ -N was mostly regulated by soil N availability. The influence of tree species on inorganic N and Nmic were mainly because of differences in litter quality. Lack of gazing decreased the Cmic:Nmic ratio owing to decreased carbon output and increased the ability of soil to supply N. The soil N supply under the P. sylvestris var. mongolica plantation was lower than under the P. densiflora plantation.

关 键 词:土壤学  无机盐  氮元素  微生物  生物量
收稿时间:6 March 2008

Soil inorganic nitrogen and microbial biomass carbon and nitrogen under pine plantations in Zhanggutai sandy soil
YU Zhan-Yuan,CHEN Fu-Sheng,ZENG De-Hui,ZHAO Qiong,CHEN Guang-Sheng.Soil inorganic nitrogen and microbial biomass carbon and nitrogen under pine plantations in Zhanggutai sandy soil[J].Pedosphere,2008,18(6):775-784.
Authors:YU Zhan-Yuan  CHEN Fu-Sheng  ZENG De-Hui  ZHAO Qiong and CHEN Guang-Sheng
Institution:aDaqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016 (China);bLife College, Nanchang University, Nanchang 330029 (China);cEcosystem Sciences and Regional Analysis (ESRA) Lab., School of Forestry & Wildlife Science, Auburn University, Alabama 36849 (USA)
Abstract:The dynamics of soil inorganic nitrogen (NH+4-N and NO-3N) and microbial biomass carbon (Cmic) and nitrogen (Nmic) under 30-year-old fenced Pinus sylvestris L. var. mongolica Litvin (SF), unfenced P. sylvestris L. var. mongolica Litvin (SUF), and unfenced Pinus densiflora Siebold et Zucc. (DUF) plantations in the Zhanggutai sandy soil of China were studied during Apr. to Oct. 2004 by the in situ closed-top core incubation method. All mentioned C and N indices in each stand type fluctuated over time. The ranges of inorganic N, Cmic, and Nmic contents in the three stand types were 0.7-2.6, 40.0-128.9, and 5.4-15.2 μg g-1, respectively. The average contents of soil NH+4-N and Cmic under the three 30-year-old pine plantations were not different. However, soil NO-3-N and total inorganic N contents decreased in the order of SUF > SF > DUF, the Nmic content was in the order of SF = SUF > DUF, and the Cmic:Nmic ratio was in the order of SUF = DUF > SF. Seasonal variations were observed in soil inorganic N, microbial biomass, and plant growth. These seasonal variations had certain correlations with microbe and plant N use in the soil, and their competition for NH+4-N was mostly regulated by soil N availability. The influence of tree species on inorganic N and Nmic were mainly because of differences in litter quality. Lack of grazing decreased the Cmic:N<,mic> ratio owing to decreased carbon output and increased the ability of soil to supply N. The soil N supply under the P. sylvestris var. mongolica plantation was lower than under the P. densiflora plantation.
Keywords:ecosystem management  Horqin sandy land  soil nitrogen availability  Pinus densiflora  Pinus sylvestris var  mongolica
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