Long-term rice cultivation increases contributions of plant and microbial-derived carbon to soil organic carbon in saline-sodic soils.

IF 8.2 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Science of the Total Environment Pub Date : 2023-12-15 Epub Date: 2023-08-31 DOI:10.1016/j.scitotenv.2023.166713
Xuejun Du, Hao Hu, Tianhao Wang, Li Zou, Wenfeng Zhou, Haixiang Gao, Xueqin Ren, Jie Wang, Shuwen Hu
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引用次数: 0

Abstract

Rice cultivation has been demonstrated to have the ability to improve saline-sodic soil. Whether this human activity can influence the accumulation of soil organic carbon (SOC) in saline-sodic soil remains unclear. In this study, the impact of rice cultivation across different planting durations (1, 5, 10, 27 years and abandoned land) on the carbon (C) levels, derived from plant residues and microbial necromass, were assessed. Compared to the control, plant residues and microbial necromass greatly contributed to the carbon accumulation. For the short-term of rice cultivation (1-10 years), the C content originated from both microbial and plant residues gradually accumulated. In the prolonged cultivation phase (27Y), plant residues and microbial necromasses contributed 40.82 % and 21.03 % of the total SOC, respectively. Additionally, rice cultivation significantly reduced the pH by 13.58-22.51 %, electrical conductivity (EC) by 60.06-90.30 %, and exchangeable sodium percentage (ESP) by 60.68-78.39 %. In contrast, total nitrogen (TN), total phosphorus (TP), SOC, particulate organic C, mineral-bound organic C, and microbial biomass all saw statistical increases. The activities of extracellular enzymes in paddy soils, such as peroxidase, phenol oxidase, and leucine aminopeptidase, were significantly reduced, and the decomposition of lignin, phenol, and amino sugars by soil microorganisms was consequently suppressed. The partial least squares path modeling results demonstrated that rice cultivation affected the accumulation of plant and microbial components via the corresponding chemical properties (pH, EC, and ESP), nutrient content (TN, TP, and SOC), enzyme activity (LAP, PER, and POX), microbial biomass, and plant biomass. These findings are crucial for understanding the organic carbon sequestration potential of sodic saline soils.

长期种植水稻增加了植物和微生物来源的碳对盐碱地土壤有机碳的贡献。
水稻栽培已被证明具有改良盐碱土壤的能力。这种人类活动是否会影响盐碱土中土壤有机碳(SOC)的积累尚不清楚。在这项研究中,评估了不同种植期(1年、5年、10年、27年和废弃土地)的水稻种植对植物残留物和微生物尸体产生的碳(C)水平的影响。与对照相比,植物残留物和微生物尸体对碳积累有很大贡献。在短期(1-10年)的水稻栽培中,微生物和植物残留物产生的碳含量逐渐积累。在延长的培养阶段(27Y),植物残留物和微生物坏死块分别占总SOC的40.82%和21.03%。此外,水稻栽培显著降低了pH值13.58-22.51%,电导率(EC)60.06-90.30%,可交换钠百分比(ESP)60.68-78.39%。相比之下,总氮(TN)、总磷(TP)、有机碳(SOC)、颗粒有机碳、矿物结合有机碳和微生物生物量都有统计学上的增加。水稻土胞外酶如过氧化物酶、酚氧化酶和亮氨酸氨肽酶的活性显著降低,从而抑制了土壤微生物对木质素、酚和氨基糖的分解。偏最小二乘路径建模结果表明,水稻栽培通过相应的化学性质(pH、EC和ESP)、养分含量(TN、TP和SOC)、酶活性(LAP、PER和POX)、微生物生物量和植物生物量影响植物和微生物成分的积累。这些发现对于理解钠盐土的有机碳固存潜力至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Science of the Total Environment
Science of the Total Environment 环境科学-环境科学
CiteScore
17.60
自引率
10.20%
发文量
8726
审稿时长
2.4 months
期刊介绍: The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.
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