Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15791 |
Diurnal variability in soil nitrous oxide emissions is a widespread phenomenon | |
Yuk-Faat Wu; Jeanette Whitaker; Sylvia Toet; Amy Bradley; Christian A. Davies; Niall P. McNamara | |
2021-07-20 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | Manual measurements of nitrous oxide (N2O) emissions with static chambers are commonly practised. However, they generally do not consider the diurnal variability of N2O flux, and little is known about the patterns and drivers of such variability. We systematically reviewed and analysed 286 diurnal data sets of N2O fluxes from published literature to (i) assess the prevalence and timing (day or night peaking) of diurnal N2O flux patterns in agricultural and forest soils, (ii) examine the relationship between N2O flux and soil temperature with different diurnal patterns, (iii) identify whether non-diurnal factors (i.e. land management and soil properties) influence the occurrence of diurnal patterns and (iv) evaluate the accuracy of estimating cumulative N2O emissions with single-daily flux measurements. Our synthesis demonstrates that diurnal N2O flux variability is a widespread phenomenon in agricultural and forest soils. Of the 286 data sets analysed, ~80% exhibited diurnal N2O patterns, with ~60% peaking during the day and ~20% at night. Contrary to many published observations, our analysis only found strong positive correlations (R > 0.7) between N2O flux and soil temperature in one-third of the data sets. Soil drainage property, soil water-filled pore space (WFPS) level and land use were also found to potentially influence the occurrence of certain diurnal patterns. Our work demonstrated that single-daily flux measurements at mid-morning yielded daily emission estimates with the smallest average bias compared to measurements made at other times of day, however, it could still lead to significant over- or underestimation due to inconsistent diurnal N2O patterns. This inconsistency also reflects the inaccuracy of using soil temperature to predict the time of daily average N2O flux. Future research should investigate the relationship between N2O flux and other diurnal parameters, such as photosynthetically active radiation (PAR) and root exudation, along with the consideration of the effects of soil moisture, drainage and land use on the diurnal patterns of N2O flux. The information could be incorporated in N2O emission prediction models to improve accuracy. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/333815 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Yuk-Faat Wu,Jeanette Whitaker,Sylvia Toet,et al. Diurnal variability in soil nitrous oxide emissions is a widespread phenomenon[J]. Global Change Biology,2021. |
APA | Yuk-Faat Wu,Jeanette Whitaker,Sylvia Toet,Amy Bradley,Christian A. Davies,&Niall P. McNamara.(2021).Diurnal variability in soil nitrous oxide emissions is a widespread phenomenon.Global Change Biology. |
MLA | Yuk-Faat Wu,et al."Diurnal variability in soil nitrous oxide emissions is a widespread phenomenon".Global Change Biology (2021). |
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