JOURNAL OF NATURAL RESOURCES ›› 2014, Vol. 29 ›› Issue (9): 1565-1575.doi: 10.11849/zrzyxb.2014.09.011

• Resources Evaluation • Previous Articles     Next Articles

Emissions of CH4 and N2O from Island Forested Swampin Da Hinggan Mountains

LIU Xia1,2, HU Hai-qing1, ZHAO Xi-kuan2, HUANG Chao2, WANG Heizilai2, SUN Long1, SUN Cheng-kun3   

  1. 1. College of Forestry, Northeast Forestry University, Harbin 150040, China;
    2. Forestry and Agriculture of Academy in the Da Hinggan Mountains, Nenjiangyuan Forest Ecosystem Research Station, Jiagedaqi 165000, China;
    3. Bureau of Forestry in the Da Hinggan Mountains, Jiagedaqi 165000, China
  • Received:2013-03-11 Revised:2014-01-19 Online:2014-09-20 Published:2014-09-20

Abstract:

Emissions of CH4 and N2O in swamps especially at high latitudes are significant toevaluate greenhouse gases emissions at the northern latitudes. During the growing season of2011, using a static opaque chamber-GC technique, we researched CH4 and N2O emission fluxesin two typical island-forested swamps (Betula platyphylla-Carex schmidtii swamp and Larixgmelinii-Carex schmidtii swamp) in Da Hinggan Mountains of China, analyzed the seasonal characteristics of CH4 and N2O fluxes, and investigated the influences from temperature and watermaster factors to the emission fluxes. The results showed that: CH4 was in weak absorption during growing season in both B. platyphylla-C. schmidtii swamp and Larix gmelinii-Carex schmidtiiswamp except that CH4 fluxes had emission peaks in spring; while N2O emissionpeaks appeared in early summer and spring in two swamps. The average emission fluxes were -60.61,-93.21 μg·m-2·h-1 and 82.92, 45.06 μg· m-2·h-1 respectively. CH4 and N2O emissionfluxes during growing season in L. gmelinii-C. schmidtii swamp were in negative correlationwith 10-40 cm and 15-40 cm soil temperatures respectively; while CH4 and N2O emissionfluxes during growing season in B. platyphylla-C. schmidtii swamp were only in negative correlationwith 40 cm soil temperature. Neither two types of swamp and soil water ratio had approachedstrong correlations. CH4 and N2O emission fluxes during growing seasonwere-2.21,-2.74 kg·hm-2 and 2.74, 0.93 kg·hm-2 respectively in B. platyphylla-C. schmidtii swamp and L. gmelinii-C. schmidtii swamp, which became the sinks of CH4 weak absorptionand the sources of N2O weak emission.

Key words: broadleaved forested swamps, Da Hinggan Mountains, CH4 and N2O

CLC Number: 

  • Q948.1