免耕处理对北方栽培泥炭土温室气体排放的影响较小

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Henri Honkanen, Hanna Kekkonen, Jaakko Heikkinen, Janne Kaseva, Kristiina Lång
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引用次数: 0

摘要

在2018年建立的长期常规耕作(CT)和免耕(NT)处理下,测量了2018 - 2021年芬兰西南部泥炭地春粮单一栽培的温室气体(GHG)排放。在整个研究期间,大约每两周用腔室测量一氧化二氮(N2O)、二氧化碳(CO2)和甲烷(CH4)的通量。测定了生长季生态系统净交换,利用经验模型模拟了逐时生态系统呼吸(ER)和总光合作用(GP)。在整个周期内,年排放量分别为6.8±1.2和5.7±1.2 Mg CO2-C ha−1年−1(净生态系统碳平衡),8.8±2.0和7.1±2.0 kg N2O-N ha−1年−1,以及- 0.43±0.31和- 0.40±0.31 kg CH4-C ha−1年−1。北纬地区的全球变暖潜势较低(p = 0.045),其变化范围为26 ~ 34 Mg CO2当量ha−1 yr−1,北纬地区的变化范围为19 ~ 31 Mg CO2当量ha−1 yr−1。2019年CT和2020年NT均有较高GP。不同处理之间的ER差异主要发生在生长季节之外,特别是在翻耕之后,但年增长率没有统计学差异。2020年,与常规处理相比,新灌丛减少了31%的N2O排放(p = 0.044),而其他年份的处理之间没有差异。结果表明,NT可能有可能略微减少栽培泥炭土的CO2和N2O排放,但结果来自于从CT到NT管理转变后的前3年,对于栽培泥炭土的NT仍然缺乏长期的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Minor effects of no-till treatment on GHG emissions of boreal cultivated peat soil

Minor effects of no-till treatment on GHG emissions of boreal cultivated peat soil

The greenhouse gas (GHG) emissions of spring cereal monoculture under long-term conventional tillage (CT) and no-till (NT) treatment established in 2018 were measured in a peatland in Southwestern Finland during the period 2018–2021. Nitrous oxide (N2O), carbon dioxide (CO2) and methane (CH4) fluxes were measured with chambers approximately every two weeks throughout the period under study. Net ecosystem exchange was measured during the growing seasons, and hourly ecosystem respiration (ER) and gross photosynthesis (GP) were modelled with empirical models. Across the whole period, annual emissions were 6.8 ± 1.2 and 5.7 ± 1.2 Mg CO2–C ha −1 yr−1 (net ecosystem carbon balance), 8.8 ± 2.0 and 7.1 ± 2.0 kg N2O–N ha−1 yr−1, and − 0.43 ± 0.31 and − 0.40 ± 0.31 kg CH4-C ha−1 yr−1 for CT and NT, respectively. The global warming potential was lower in NT (p = 0.045), and it ranged from 26 to 34 Mg CO2 eq. ha−1 yr−1 in CT and from 19 to 31 Mg CO2 eq. ha−1 yr−1 in NT. The management effect on the rates of single GHGs was not consistent over the years. Higher GP was found in CT in 2019 and in NT in 2020. Differences in ER between treatments occurred mostly outside the growing season, especially after ploughing, but the annual rates did not differ statistically. NT reduced the N2O emissions by 31% compared to CT in 2020 (p = 0.044) while there were no differences between the treatments in other years. The results indicate that NT may have potential to reduce slightly CO2 and N2O emissions from cultivated peat soil, but the results originate from the first three years after a management change from CT to NT, and there is still a lack of long-term results on NT on cultivated peat soils.

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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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