Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (11): 15-21.doi: 10.11924/j.issn.1000-6850.casb2021-1224

Special Issue: 生物技术

Previous Articles     Next Articles

Effects of Different Nitrogen Forms on Nitrogen Uptake and N2O Emission of Calamagrostis angustifolia in Wetland

FU Xiaoling1(), NI Hongwei2, LIU Yingnan1, WANG Jianbo1, WANG Jifeng1()   

  1. 1Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin 150040
    2Heilongjiang Academy of Forestry, Harbin 150081
  • Received:2021-12-31 Revised:2022-02-12 Online:2022-04-15 Published:2022-05-18
  • Contact: WANG Jifeng E-mail:49375060@qq.com;112471822@qq.com

Abstract:

Nitrogen biogeochemical cycles and mitigation of greenhouse gas emission have become a hot topic in global climate change research. Nitrogen availability is an important factor in the feedback mechanism of global climate change regulation. This research used a small Calamagrostis angustifolia wetland in the Sanjiang Plain of northeast China as the research object and adopted 15N tracer technique to study the uptake of different nitrogen forms (NH4+, NO3-, NH+4-NO-3) by C. angustifolia and its N2O emission flux through field in situ control experiments. The results showed as follows. (1) Under different nitrogen forms, the biomass of C. angustifolia leaf showed: A>NA>N>CK; the stem biomass of treatment A was the largest, which was 35.7% higher than that of CK; the underground biomass of treatment NA was significantly higher than that of treatment A and CK (P<0.05); the root-shoot ratio of treatment NA was the largest, which was 1.82 times that of CK. (2) Under different nitrogen forms, the nitrogen contents in leaf, stem, aboveground part and root were significantly higher than those of CK (P<0.05), but there was no significant difference in nitrogen contents among different treatments (P<0.05). (3) Under different nitrogen forms, the contents of Ndff and 15N in leaf, stem and aboveground part showed: A>N>NA>CK, and each treatment had significantly higher content than that of CK (P<0.01), and there was a significant difference among all the treatments (P<0.05). (4) Under different nitrogen forms, the N2O emission was the highest in treatment N, significantly higher than that of treatment A and NA (P<0.05), and the N2O emission of treatment N, A and NA were significantly higher than that of CK (P<0.05). This study discussed the cycling and distribution strategies of different nitrogen forms in the plant-soil-atmosphere system, as well as their effects on N2O emission, it will provide basic data for the research on wetland nitrogen biogeochemistry and greenhouse gas emission.

Key words: Sanjiang Plain, wetland, nitrogen forms, tracer technique

CLC Number: