美国太平洋西北部小麦-土壤系统土壤有机碳对保水性的影响

IF 2.1 Q3 SOIL SCIENCE
Paulina B. Ramírez, S. Machado, Surendra Singh, Rachael Plunkett, F. Calderón
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引用次数: 0

摘要

土壤有机碳(SOC)被认为是土壤保水的重要贡献者。然而,关于SOC在有效持水量(AWHC)中的作用的概括可能不准确地描述了这种关系。我们的目的是使用国家合作土壤调查(NCSS)数据库重新检查SOC和保水性之间的关系。我们关注太平洋西北部小麦生产区内的区域土壤群,包括Haploxerols、Argixerols、Haplocambids和Durixerols。我们根据SOC、总氮(TN)、pH、质地、堆积密度(BD)、田间容量(FC)、永久萎蔫点(PWP)和AWHC对77个地点进行了评估。我们的研究结果表明,质地和BD是AWHC变化的最重要因素,而SOC在解释这种变化中起着次要作用。中红外(MIR)光谱与随机森林(RF)算法相结合,用于评估光谱带在确定FC和PWP变化中的重要性。该分析确定,高岭石(3700 cm−1)和Si-O-Si泛音(1870 cm−2)中与内表面羟基相关的矿物带是PWP最重要的光谱贡献者。FC的保水性与与土壤聚集相关的有机吸收有关,如多糖C–O(~1035 cm−1),而矿物带的影响相对较小。这项研究强调,有必要重新审视SOC的影响以及土壤质地和压实度对土壤保水性的相互作用,以阐明AWHC的潜在机制,从而为未来的干旱适应策略提供见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Addressing the effects of soil organic carbon on water retention in US Pacific Northwest wheat–soil systems
Soil organic carbon (SOC) is considered a significant contributor to soil water retention. However, generalizations about the role of SOC in available water-holding capacity (AWHC) may have inaccurately portrayed this relationship. We aim to reexamine the relationship between SOC and water retention using the National Cooperative Soil Survey (NCSS) Database. We focus on regional soil groups within the Pacific Northwest wheat production region, including Haploxerolls, Argixerolls, Haplocambids, and Durixerolls. We evaluated 77 sites based on SOC, total nitrogen (TN), pH, texture, bulk density (BD), field capacity (FC), permanent wilting point (PWP), and AWHC. Our findings indicate that texture and BD were the most significant contributors to AWHC variation, while SOC played a secondary role in explaining this variation. Mid-infrared (MIR) spectroscopy coupled with a random forest (RF) algorithm was used to evaluate the importance of spectral bands in determining changes in FC and PWP. This analysis identified mineral bands related to inner-surface hydroxyl groups in kaolinite (3700 cm −1) and Si-O-Si overtones (1870 cm −1) as the most important spectral contributors to PWP. The water retention at FC was associated with organic absorbances relevant to soil aggregation, such as polysaccharide C–O (~1035 cm −1), while mineral bands were relatively less influential. This study highlights the need to reexamine the impact of SOC as well as the interaction between soil texture and compaction on soil water retention to elucidate the underlying mechanisms responsible for AWHC, thus providing insight into future drought adaptation strategies.
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