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Effects of N Fertilization on Soil Microbial Respiration in Larix Gmelinii Plantation
S. X. Jia, C. Q. Hu, Y. Sun, J. Han, W. L. Zhang, X. W. Chen, A. Z. Liang and S. X. Zhang
2018
发表期刊Applied Ecology and Environmental Research
卷号16页码:5921-5932
摘要Soil organic carbon decomposition is regulated by soil physical and chemical properties, such as soil nitrogen (N) and soil substrate quality. In this study, soil samples from both N fertilization and control plots were collected at two depths in a Larix gmelinii plantation to determine if N addition elicits consistent responses in microbial respiration in bulk and rhizosphere soil, and to determine the temporal and spatial dynamics of soil organic carbon decomposition. Soil bulk and rhizosphere microbial respiration were determined using the NaOH solution absorption method. Soil microbial biomass was determined by a modified CHCL3 fumigation-extraction method. The greatest soil bulk and rhizosphere microbial respiration occurred in July. Soil rhizosphere microbial respiration was higher than bulk respiration at 0-10 cm and 10-20 cm. The biggest reductions in soil microbial respiration induced by fertilization were 15.0% (bulk) and 19.6% (rhizosphere) at 0-10 cm in July, and 6.4% (bulk) and 7.9% (rhizosphere) at 10-20 cm in September. Fertilization did not influence the rhizosphere priming effect except for at 10-20 cm in May. Structural equation modeling revealed that soil microbial biomass carbon (MBC) and nitrogen (MBN) contributed directly to soil microbial respiration. Moreover, soil total N and organic carbon content were associated with soil microbial respiration through MBC and MBN. These results suggest that N fertilization suppresses soil organic carbon decomposition by decreasing soil microbial biomass, while C input induced by root exudates determined the rhizosphere priming effect, not soil microbes in the rhizosphere.
文献类型期刊论文
条目标识符http://ir.iga.ac.cn/handle/131322/9151
专题中国科学院东北地理与农业生态研究所
作者单位中国科学院东北地理与农业生态研究所
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GB/T 7714
S. X. Jia, C. Q. Hu, Y. Sun, J. Han, W. L. Zhang, X. W. Chen, A. Z. Liang and S. X. Zhang. Effects of N Fertilization on Soil Microbial Respiration in Larix Gmelinii Plantation[J]. Applied Ecology and Environmental Research,2018,16:5921-5932.
APA S. X. Jia, C. Q. Hu, Y. Sun, J. Han, W. L. Zhang, X. W. Chen, A. Z. Liang and S. X. Zhang.(2018).Effects of N Fertilization on Soil Microbial Respiration in Larix Gmelinii Plantation.Applied Ecology and Environmental Research,16,5921-5932.
MLA S. X. Jia, C. Q. Hu, Y. Sun, J. Han, W. L. Zhang, X. W. Chen, A. Z. Liang and S. X. Zhang."Effects of N Fertilization on Soil Microbial Respiration in Larix Gmelinii Plantation".Applied Ecology and Environmental Research 16(2018):5921-5932.
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