Long-Term Application of No-Tillage-Induced Greater Risk of Poor Topsoil Aeration Along a European Pedoclimatic Gradient

IF 4 2区 农林科学 Q2 SOIL SCIENCE
Loraine ten Damme, Marta Goberna, Sara Sánchez-Moreno, Mansonia Pulido-Moncada, Laurent Philippot, Mart Ros, Luca Bragazza, Sara Hallin, Dalia Feiziene, Lars Juhl Munkholm
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Abstract

This paper assesses the effect of long-term contrasting tillage practices on topsoil structural characteristics critical for nitrous oxide (N2O) emissions and carbon sequestration across a pedoclimatic gradient. The hypotheses tested are that: (i) aeration is greater in the topsoil of ploughed (to 0.20–0.30 m depth) than in no-till soils and (ii) the effect of tillage practice on soil functionality depends on the context, and thus varies between sites with different pedoclimatic conditions. We evaluated the topsoil characteristics of seven long-term tillage experiments, spread along a 2600-km transect in Europe. A total of 576 soil cores (100-cm3) were sampled from 0 to 0.10 and 0.10 to 0.20 m depths in mouldboard-ploughed and no-tillage treatments after harvest. The soil water content at −30, −60, and −100 hPa matric potential was measured as well as air permeability (ka) and relative gas diffusivity (Ds/Do) at −100 hPa, from which soil bulk and gas transport characteristics were derived. Despite large variations in the characteristics among sites, tillage did significantly affect the characteristics across sites. The degree of compactness was less and total pore volume was greater in the ploughed than in the no-till treatments. Still, thresholds indicating suitable conditions for root growth were largely met under both practices. The ploughed soils showed vertical stratification, with a better aeration of the 0–0.10 m soil layer compared to the 0.10–0.20 m layer. No differences were observed between the ploughed 0.10–0.20 m and no-till layers, which were attributed to soil settlement after ploughing. While the Ds/Do at 0.10–0.20 m depth was favourable for promoting N2O emissions, the water-filled pore space was below suggested thresholds. Impacts of tillage on soil structural and functional characteristics were both significant and generalisable but also deviated locally. For example, Ds/Do and ka generally increased with the air-filled pore volume (εa), yet sites with greater εa did not necessarily have higher Ds/Do and ka. Existing models explaining Ds/Do and ka with εa were fitted to the measured data and performed best when both depths and tillage practices were assessed altogether. Despite the limited differences at −100 hPa, anoxic conditions may in reality prevail for a longer period under no-till than ploughing.

Abstract Image

沿欧洲土壤梯度长期施用免耕引起的表土通气差风险较大
本文评估了长期对比耕作方式对表土结构特征的影响,表土结构特征对土壤气候梯度下一氧化二氮(N2O)排放和碳封存至关重要。所测试的假设是:(i)耕过的表层土壤(至0.20-0.30 m深)的通气性比免耕土壤大;(ii)耕作方式对土壤功能的影响取决于环境,因此在不同的土壤气候条件下因地而异。我们评估了七个长期耕作试验的表层土壤特征,这些试验分布在欧洲2600公里的样带上。在收获后采用板耕和免耕处理,在0 ~ 0.10和0.10 ~ 0.20 m深度取样576个土壤核(100-cm3)。测量了−30、−60和−100 hPa条件下的土壤含水量,以及−100 hPa条件下的空气渗透性(ka)和相对气体扩散系数(Ds/Do),由此得出了土壤体积和气体输运特征。尽管不同立地间的特征差异较大,但耕作对不同立地间的特征有显著影响。与免耕处理相比,翻耕处理的密实度更小,总孔隙体积更大。尽管如此,在这两种做法下,表明适合根生长条件的阈值在很大程度上都达到了。耕作土壤呈垂直分层,0 ~ 0.10 m土层比0.10 ~ 0.20 m土层透气性好。耕层厚度在0.10 ~ 0.20 m与免耕层之间无显著差异,主要原因是土壤沉降。0.10 ~ 0.20 m深度的Ds/Do有利于促进N2O排放,但充水孔隙空间低于建议阈值。耕作方式对土壤结构和功能特征的影响既显著又具有普遍性,但也存在局部偏差。例如,Ds/Do和ka一般随充气孔体积(εa)的增大而增大,但εa越大的位点Ds/Do和ka并不一定越高。用εa解释Ds/Do和ka的现有模型与实测数据拟合,在综合评估深度和耕作方式时表现最佳。尽管在- 100 hPa条件下差异有限,但实际上,在免耕条件下,缺氧条件可能比耕作持续更长时间。
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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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