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Effects of long-term elevated CO2 on N2-fixing, denitrifying and nitrifying enzyme activities in forest soils under Pinus sylvestriformis in Changbai Mountain

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Abstract

A study was conducted to determine the effects of elevated CO2 on soil N process at Changbai Mountain in Jilin Province, northeastern China (42°24′N, 128°06′E, and 738 m elevation). A randomized complete block design of ambient and elevated CO2 was established in an open-top chamber facility in the spring of 1999. Changpai Scotch pine (Pinus sylvestris var. sylvestriformis seeds were sowed in May, 1999 and CO2 fumigation treatments began after seeds germination. In each year, the exposure started at the end of April and stopped at the end of October. Soil samples were collected in June and August 2006 and in June 2007, and soil nitrifying, denitrifying and N2-fixing enzyme activities were measured. Results show that soil nitrifying enzyme activities (NEA) in the 5–10 cm soil layer were significantly increased at elevated CO2 by 30.3% in June 2006, by 30.9% in August 2006 and by 11.3% in June 2007. Soil denitrifying enzyme activities (DEA) were significantly decreased by elevated CO2 treatment in June 2006 (P < 0.012) and August 2006 (P < 0.005) samplings in our study; no significant difference was detected in June 2007, and no significant changes in N2-fixing enzyme activity were found. This study suggests that elevated CO2 can alter soil nitrifying enzyme and denitrifying enzyme activities.

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Authors and Affiliations

  1. Forestry Center, Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua road, Shenyang City, Liaoning Province, 110016, P.R. China

    Jun-Qiang Zheng, Shi-Jie Han, Yu-Mei Zhou & Yan Zhang

  2. College of Agronomy, Shenyang Agricultural University, Shenyang, 110161, China

    Fei-Rong Ren

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  1. Jun-Qiang Zheng
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  2. Shi-Jie Han
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  3. Fei-Rong Ren
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  4. Yu-Mei Zhou
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  5. Yan Zhang
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Correspondence to Shi-Jie Han.

Additional information

Foundation project: This research was supported by the National Natural Science Foundation of China (No. 90411020) and Major State Basic Research Development Program of China (973 Program) (2002CB412502).

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Zheng, JQ., Han, SJ., Ren, FR. et al. Effects of long-term elevated CO2 on N2-fixing, denitrifying and nitrifying enzyme activities in forest soils under Pinus sylvestriformis in Changbai Mountain. Journal of Forestry Research 19, 283–287 (2008). https://doi.org/10.1007/s11676-008-0050-3

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