田间土壤特性和实验养分添加驱动实验室反硝化实验中一氧化二氮比率的系统综述

IF 2.1 Q3 SOIL SCIENCE
M. Foltz, A. Alesso, J. Zilles
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引用次数: 0

摘要

一氧化二氮(N2O)会导致全球气候变化和平流层臭氧破坏,在脱氮过程中会产生。尽管衡量脱氮完成程度的N2O比率受到各种性质的影响,但研究在很大程度上仅限于现场或处理的特定结论。本研究的主要目的是通过系统回顾和定量评估已发表的实验室反硝化研究结果,确定驱动土壤中N2O比率的重要因素及其关系。编制了一个包含60项研究(657项观测)的数据库,其中包括符合最低标准的研究:(i)土壤实验室实验,(ii)添加营养素(碳和/或氮),以及(iii)N2O和二硝基气体测量。其中,14项研究(100项观察)有足够的数据纳入荟萃分析,以评估添加营养素对N2O比率的影响。此外,我们通过拟合具有定量和分类变量的元回归模型,对调节因子对治疗效果的影响进行了建模。对数据库中的研究进行了仔细审查,确定土壤pH值、碳添加量和氮添加量是N2O比率的重要变量,但各研究的趋势各不相同。所有研究的相关性分析表明,土壤pH值与N2O比率显著相关,其中pH值较高的土壤N2O比率较低。荟萃分析进一步显示,添加营养素具有总体显著的积极治疗效果(0.30±0.03,P<.0001),表明实验添加营养素增加了N2O比率。当土壤质地被用作调节剂时,该模型得到了最显著的改善。土壤质地对N2O比率的重要性是本研究的一个主要发现,特别是因为测定通常是用土壤泥浆进行的。总体而言,本研究强调了田间土壤特性(即pH值、质地)和实验室条件(即养分添加)在推动土壤中N2O比率和反硝化产生N2O方面的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Field soil properties and experimental nutrient additions drive the nitrous oxide ratio in laboratory denitrification experiments: a systematic review
Nitrous oxide (N2O), which contributes to global climate change and stratospheric ozone destruction, can be produced during denitrification. Although the N2O ratio, a measure of denitrification completion, is influenced by various properties, studies have largely been limited to site- or treatment-specific conclusions. The primary objective of this study was to identify important factors driving N2O ratios and their relationships in soils by systematically reviewing and quantitatively evaluating results from published laboratory denitrification studies. A database with 60 studies (657 observations) was compiled, including studies meeting the minimum criteria: (i) laboratory experiments on soils, (ii) nutrient (carbon and/or nitrogen) addition, and (iii) N2O and dinitrogen gas measurements. Of these, 14 studies (100 observations) had sufficient data for inclusion in the meta-analysis to assess the effect of added nutrients on the N2O ratio. Furthermore, we modeled the effect of moderators on treatment effect by fitting a meta-regression model with both quantitative and categorical variables. Close review of studies in the database identified soil pH, carbon addition, and nitrogen addition as important variables for the N2O ratio, but trends varied across studies. Correlation analysis of all studies clarified that soil pH was significantly correlated with the N2O ratio, where soils with higher pH had lower N2O ratios. The meta-analysis further revealed that nutrient addition had an overall significant, positive treatment effect (0.30 ± 0.03, P<.0001), indicating that experimentally adding nutrients increased the N2O ratio. The model was most significantly improved when soil texture was used as a moderator. The significance of soil texture for the N2O ratio was a major finding of this study, especially since the assays were usually conducted with soil slurries. Overall, this study highlights the importance of field soil properties (i.e., pH, texture) and laboratory conditions (i.e., nutrient addition) in driving the N2O ratio and N2O production from denitrification in soils.
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CiteScore
1.90
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