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

doi:10.11924/j.issn.1000-6850.casb2021-1224

Abstract

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:

S610.30

FU Xiaoling, NI Hongwei, LIU Yingnan, WANG Jianbo, WANG Jifeng. Effects of Different Nitrogen Forms on Nitrogen Uptake and N₂O Emission of Calamagrostis angustifolia in Wetland[J]. Chinese Agricultural Science Bulletin, 2022, 38(11): 15-21.

Figures/Tables 6

References 35

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处理	叶生物量/g	茎生物量/g	地下生物量/g	根冠比
CK	226.00±9.18^a	253.05±14.86^a	1322.10±15.57^a	2.02±0.40^a
N	274.27±8.79^a	336.60±11.08^b	1807.67±18.25^b	2.96±0.75^b
A	317.92±10.05^b	343.35±10.43^b	1335.25±14.54^a	2.39±0.16^a
NA	277.15±9.45^a	327.70±12.26^b	1952.10±16.78^b	3.68±0.93^b

处理	叶生物量/g	茎生物量/g	地下生物量/g	根冠比
CK	226.00±9.18^a	253.05±14.86^a	1322.10±15.57^a	2.02±0.40^a
N	274.27±8.79^a	336.60±11.08^b	1807.67±18.25^b	2.96±0.75^b
A	317.92±10.05^b	343.35±10.43^b	1335.25±14.54^a	2.39±0.16^a
NA	277.15±9.45^a	327.70±12.26^b	1952.10±16.78^b	3.68±0.93^b

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

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