Pedosphere最新文献_第6页

Plasticulture increases the diversity rather than the abundance of microplastics in soil: A case study 塑料栽培增加了土壤中微塑料的多样性而非丰度：案例研究

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere

Pub Date : 2025-02-01 DOI: 10.1016/j.pedsph.2024.01.001

Shi YAO , Li XU , Yongrong BIAN , Xin JIANG , Yang SONG

引用次数: 0

Soil holobiont interplay and its role in protecting plants against salinity stress 土壤整体生物的相互作用及其在保护植物免受盐碱胁迫方面的作用

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere

Pub Date : 2025-02-01 DOI: 10.1016/j.pedsph.2024.09.002

Amani SLITI , Vineet SINGH , Anjali PANDE , Jae-Ho SHIN

Salinity poses a significant challenge to global agricultural productivity, impacting plant growth, yield, soil fertility, and the composition of soil microbial communities. Moreover, salinity has a significant impact in shifting soil microbial communities and their functional profiles. Therefore, we explored and analyzed the intricate relationships among plant-associated microbes/microbiome, including plant growth-promoting bacteria, arbuscular mycorrhizal fungi (AMF), archaea, and viruses in alleviating salinity stress in plants. In this review, we have highlighted that salinity stress selectively enhances the growth of certain microbes such as Gammaproteobacteria, Bacteroidetes, Firmicutes, Acidobacteria, Euryarchaeota, Thaumarchaeota, Crenarchaeota, and lysogenic viruses, while decreasing the abundances of others (Alphaproteobacteria and Betaproteobacteria) and AMF root colonization. These microbes regulate water and nutrient uptake, decrease ionic and osmotic toxicity, enhance the syntheses of antioxidant enzymes (catalase and glutathione S-transferases) and osmolytes (erythrose and galactinol), increase phytohormone (indole-3 acetic acid) production, and activate salinity stress tolerance genes (SOD, APX, and SKOR) in plants. Furthermore, we meticulously examined the significance of soil microbiome and the need for multidisciplinary omics studies on the changes in soil microbiome composition and the relationships of synergistic holobiont in mitigating salinity stress in plants. Such studies will provide insights into the use of microbial components as a sustainable and eco-friendly approach to modulate salinity stress and enhance agricultural productivity.

盐度对全球农业生产力构成重大挑战，影响植物生长、产量、土壤肥力和土壤微生物群落组成。此外，盐度对土壤微生物群落及其功能分布有显著影响。因此，我们探索和分析了植物相关微生物/微生物组之间的复杂关系，包括植物生长促进菌、丛枝菌根真菌（AMF）、古细菌和病毒在缓解植物盐胁迫中的作用。在这篇综述中，我们强调了盐度胁迫选择性地促进了某些微生物的生长，如Gammaproteobacteria、Bacteroidetes、Firmicutes、Acidobacteria、Euryarchaeota、Thaumarchaeota、Crenarchaeota和溶原病毒，同时降低了其他微生物（Alphaproteobacteria和Betaproteobacteria）的丰度和AMF的根定殖。这些微生物调节植物对水分和养分的吸收，降低离子和渗透毒性，促进抗氧化酶（过氧化氢酶和谷胱甘肽s -转移酶）和渗透酶（红细胞和半乳糖醇）的合成，增加植物激素（吲哚-3乙酸）的产生，并激活盐胁迫耐受基因（SOD， APX和SKOR）。此外，我们还仔细研究了土壤微生物组的重要性，以及对土壤微生物组组成变化和协同全息剂在减轻植物盐胁迫中的关系进行多学科组学研究的必要性。这些研究将为利用微生物成分作为一种可持续和生态友好的方法来调节盐度胁迫和提高农业生产力提供见解。

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引用次数: 0

Methods for control of soil-borne pathogen Ceratocystis fimbriata on sweet potato: A mini review 控制甘薯上土传病原体 Ceratocystis fimbriata 的方法：微型综述

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere

Pub Date : 2025-02-01 DOI: 10.1016/j.pedsph.2023.12.009

Daniela D. HERRERA-BALANDRANO , Suyan WANG , Bo WANG , Dongjing YANG , Xinchi SHI , Pedro LABORDA

Ceratocystis fimbriata is a hazardous fungal pathogen that causes black rot disease in sweet potato roots, leading to devastating losses during sweet potato growth and storage. All methods for managing C. fimbriata on sweet potato based on synthetic fungicides, biocontrol agents, coatings, and natural compounds are reviewed for the first time. The advantages and disadvantages of the different methods are discussed, and their efficacies are compared. Bacillus strains and the synthetic fungicides carbendazim, flutriafol, liguoling, Stadium®, thiabendazole, and thiophanate methyl show the strongest inhibitory effects. Bacillus strains possess an advantage over synthetic fungicides due to the detrimental impact of the latter on human health. The application of filamentous fungi and yeasts as biocontrol agents for C. fimbriata management has not yet been investigated. Coatings exhibit limited protection, and no attempts have been made to combine coatings with nanoparticles or essential oils. Although the natural compounds perillaldehyde and nerol are inexpensive and non-toxic, they are of low efficacy. All management strategies have been used on postharvest sweet potato roots and leaves. However, there is no approach to controlling C. fimbriata in roots during plant growth. Even though several methods for controlling C. fimbriata on sweet potato have been reported in recent years, numerous knowledge gaps impede the development of effective and safe approaches.

丝状角鼻虫是一种危险的真菌病原体，可引起甘薯根部的黑腐病，导致甘薯生长和储存期间的毁灭性损失。本文首次综述了合成杀菌剂、生物防治剂、涂料和天然化合物等防治甘薯毛霉的方法。讨论了不同方法的优缺点，并对其效果进行了比较。芽孢杆菌菌株和合成杀菌剂多菌灵、氟triafol、立果灵、Stadium®、噻苯达唑和甲基硫代盐的抑制效果最强。由于合成杀菌剂对人体健康的有害影响，芽孢杆菌菌株比合成杀菌剂具有优势。丝状真菌和酵母作为生物防治剂在毛菌管理中的应用尚未进行研究。涂层表现出有限的保护作用，并且没有尝试将涂层与纳米颗粒或精油结合起来。虽然紫苏醛和橙花醇是廉价无毒的天然化合物，但它们的功效较低。所有的管理策略都用于采收后的甘薯根和叶。然而，在植物生长过程中，尚无有效的方法来控制植物根系中的毛霉。尽管近年来已经报道了几种控制甘薯上的红弧菌的方法，但许多知识空白阻碍了有效和安全方法的发展。

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引用次数: 0

Root exudate-driven rhizospheric recruitment of plant growth-promoting rhizobacteria 根系渗出物驱动的植物生长促进根瘤菌根瘤层招募

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere

Pub Date : 2025-02-01 DOI: 10.1016/j.pedsph.2024.03.005

Hua LIN , Caixing LAI , Guo YU , Geoffrey I. SUNAHARA , Liheng LIU , Habib ULLAH , Jie LIU

To promote growth, terrestrial plants release photosynthetic products into the rhizosphere in the form of root exudates through their root systems. Under the attraction of root exudates, plant growth-promoting rhizobacteria (PGPR) colonize the rhizosphere to stimulate plant growth and/or suppress the growth of pathogenic microorganisms. The rhizospheric recruitment of PGPR, as well as the establishment of root-microbe interactions, is initiated by chemotaxis towards root exudates. Over the past several decades, scientists have made notable strides in identifying representative chemoeffectors in root exudates, as well as the corresponding chemoreceptors. We review here the most recent developments in rhizospheric chemotaxis, particularly the chemoeffectors in root exudates, the structural and functional characterization of methyl-accepting chemotaxis proteins of PGPR, and the impacts of rhizospheric chemotaxis on root colonization, biofilm formation, and other root-microbe interactions during recruitment. Finally, we propose several perspectives that aim to fully unlock the potential of PGPR as bioinoculants in sustainable agriculture.

为了促进生长，陆生植物通过根系将光合产物以根分泌物的形式释放到根际。在根分泌物的吸引下，促进植物生长的根瘤菌（PGPR）在根际定殖，刺激植物生长和/或抑制病原微生物的生长。PGPR的根际募集，以及根与微生物相互作用的建立，是通过对根渗出物的趋化而启动的。在过去的几十年里，科学家们在确定根分泌物中具有代表性的化学效应物以及相应的化学受体方面取得了显著的进展。本文综述了根际趋化研究的最新进展，特别是根分泌物中的趋化效应物，PGPR甲基化趋化蛋白的结构和功能特征，以及根际趋化对根定植、生物膜形成和其他根-微生物在招募过程中的相互作用的影响。最后，我们提出了几个观点，旨在充分释放PGPR作为可持续农业生物接种剂的潜力。

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引用次数: 0

Mechanisms of microbe-assisted metal tolerance in phytoremediators: A review 植物修复剂中微生物辅助的金属耐受机制综述

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere

Pub Date : 2025-02-01 DOI: 10.1016/j.pedsph.2024.09.003

Swati SACHDEV , Chetan KESWANI , Tatiana MINKINA , Kuldeep BAUDDH

Escalating anthropogenic activities have caused heavy metal contamination in the environmental matrices. Due to their recalcitrant and toxic nature, their occurrence in high titers in the environment can threaten survival of biotic components. To take the edge off, remediation of metal-contaminated sites by phytoremediators that exhibit a potential to withstand heavy metal stress and quench harmful metals is considered an eco-sustainable approach. Despite the enormous potential, phytoremediation technique suffers a setback owing to high metal concentrations, occurrence of multiple pollutants, low plant biomass, and soil physicochemical status that affect plants at cellular and molecular levels, inducing morphological, physiological, and genetic alterations. Nevertheless, augmentation of soil with microorganisms can alleviate the challenge. A positive nexus between microbes, particularly plant growth-promoting microorganisms (PGPMs), and phytoremediators can prevent phytotoxicity and augment phytoremediation by employing strategies such as production of secondary metabolites, solubilization of phosphate, and synthesis of 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase and phytohormones. Microbes can mediate tolerance in plants by fortifying their antioxidant machinery, which maintains redox homeostasis and alleviates metal-induced oxidative damage in the plants. Associated microbes can also activate stress-responsive genes in plants and abridge metal-induced toxic effects. An in-depth exploration of the mechanisms employed by plant-associated microbes to trigger tolerance in phytoremediators is crucial for improving their phytoremediation potential and real-world applications. The present article attempts to comprehensively review these mechanisms that eventually facilitate the development of improved/new technology for soil ecosystem restoration.

随着人类活动的加剧，环境基质中的重金属污染日益严重。由于它们的顽固性和毒性，它们在环境中的高滴度会威胁到生物成分的生存。为了减轻压力，植物修复剂对金属污染场地的修复被认为是一种生态可持续的方法，因为植物修复剂具有承受重金属压力和熄灭有害金属的潜力。尽管潜力巨大，但由于金属浓度高、多种污染物的发生、植物生物量低以及土壤理化状况在细胞和分子水平上影响植物，导致形态、生理和遗传改变，植物修复技术受到挫折。然而，用微生物增加土壤可以缓解这一挑战。微生物，特别是促进植物生长的微生物（PGPMs）和植物修复剂之间的积极联系可以通过产生次生代谢物、溶解磷酸盐、合成1-氨基环丙烷-1-羧酸（ACC）脱氨酶和植物激素等策略来预防植物毒性并增强植物修复。微生物可以通过强化其抗氧化机制来调节植物的耐受性，维持氧化还原稳态，减轻金属诱导的植物氧化损伤。相关的微生物也可以激活植物的应激反应基因，减轻金属诱导的毒性作用。深入探索植物相关微生物触发植物修复剂耐受性的机制对于提高植物修复潜力和实际应用至关重要。本文试图全面回顾这些机制，最终促进土壤生态系统修复改进/新技术的发展。

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引用次数: 0

Review of the structural properties and interfacial reactions of Al-substituted goethite, hematite and ferrihydrite 评述铝取代的鹅铁矿、赤铁矿和铁酸盐的结构特性和界面反应

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere

Pub Date : 2025-02-01 DOI: 10.1016/j.pedsph.2024.06.006

Yu LIANG , Hongfeng CHEN , Jinling XU , Mingxia WANG , Wenfeng TAN

Isomorphic substitution of ferric ion (Fe³⁺) by aluminum ion (Al³⁺) in iron (hydro)oxides is ubiquitous in natural environments. Aluminum substitution inevitably leads to changes in the microstructures, physicochemical properties, and surface reactions of iron (hydro)oxides, which may have great impacts on the sequestration of nutrients and contaminants in soils and aquatic environments. Over the past decades, the structural properties and surface reactivity of Al-substituted iron (hydro)oxides have been intensively studied. Iron (hydro)oxides in various structural forms and with different Al substitution amounts present high application potentials in addressing environmental issues. A timely summary of the structural properties and interfacial reactions of the most common and representative Al-substituted iron (hydro)oxides is of significance. Herein, the effects of Al substitution on the structural properties and surface activities of iron (hydro)oxides were clarified according to the microstructure, crystal facets, surface site type and density, interfacial reaction mechanisms, and modeling parameters of iron (hydro)oxides. This review systematically elucidates how Al substitution affects the structural properties and surface reactions of iron (hydro)oxides, including the well crystallized goethite and hematite and the poorly crystallized ferrihydrite, providing theoretical guidance for further exploration of the mineralogical characteristics and environmental geochemical behaviors of iron (hydro)oxides.

铁（氢）氧化物中，铁离子（Fe3+）被铝离子（Al3+）同形取代在自然环境中是普遍存在的。铝的取代不可避免地导致铁（氢）氧化物的微观结构、理化性质和表面反应的变化，这可能对土壤和水生环境中营养物质和污染物的固存产生很大影响。在过去的几十年中，人们对铝取代铁（氢）氧化物的结构性质和表面反应性进行了深入的研究。不同结构形式和不同铝取代量的铁（氢）氧化物在解决环境问题方面具有很高的应用潜力。及时总结最常见和最具代表性的铝取代铁（氢）氧化物的结构性质和界面反应是有意义的。本文从铁（氢）氧化物的微观结构、晶面、表面位点类型和密度、界面反应机理和建模参数等方面阐明了Al取代对铁（氢）氧化物结构性能和表面活性的影响。本文系统阐述了Al取代对铁（氢）氧化物（包括晶化良好的针铁矿和赤铁矿以及晶化不良的水合铁）结构性质和表面反应的影响，为进一步探索铁（氢）氧化物的矿物学特征和环境地球化学行为提供了理论指导。

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引用次数: 0

Rice residue management: Alternative strategies and emerging technologies for a sustainable ecosystem 稻草管理：可持续生态系统的替代战略和新兴技术

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere

Pub Date : 2025-02-01 DOI: 10.1016/j.pedsph.2024.06.004

Jagdish PARSHAD , Ravinder KUMAR , Vinod CHHOKAR , Nagaraj PATIL , Vikas BENIWAL , Namita SINGH , Ajay KUMAR , Nitesh SINGH , Rajesh YOGI , Mukesh KUMAR , Prashant VIKRAM , Avnish CHAUHAN , Anil KUMAR

Rice straw, which is produced after the harvest of rice, is a major agricultural waste in the world. Rice straw has a high carbon/nitrogen ratio and is more resistant to microbial degradation than other straws because its main constituents are cellulose and hemicelluloses encrusted by lignin. When rice straw is burned, hazardous substances such as carbon dioxide, methane, carbon monoxide, and nitrogen monoxide are released into the air as smoke (less than 10 μm-sized particles). The rise in the burning of rice straw has contributed to too many accidents and health issues in the general population residing in Haryana, Punjab, and Uttar Pradesh of India. These states are being urged by the National Green Tribunal to generate money instead of burning rice straw. Even though these lignocellulosic materials might be beneficial, not much has been carried out with them. This overview covers the properties of rice straw and husks, the numerous procedures used to create valuable products, and various applications that may be made for them. These include energy sources, environmental adsorbents, building supplies, and specialist commodities.

水稻收获后产生的秸秆是世界上主要的农业废弃物。由于稻草的主要成分是纤维素和被木质素包裹的半纤维素，因此具有较高的碳氮比，比其他秸秆更耐微生物降解。秸秆燃烧时，二氧化碳、甲烷、一氧化碳、一氧化氮等有害物质以烟雾的形式释放到空气中（颗粒小于10 μm）。焚烧稻草的增加给居住在印度哈里亚纳邦、旁遮普邦和北方邦的普通民众造成了太多的事故和健康问题。国家绿色法庭正在敦促这些邦创收，而不是焚烧稻草。尽管这些木质纤维素材料可能是有益的，但对它们的研究还不多。本综述涵盖了稻秆和稻壳的特性，用于制造有价值产品的众多程序，以及可能为它们制作的各种应用。这些包括能源、环境吸附剂、建筑用品和专业商品。

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引用次数: 0

Effects of plasticizer on removal of antibiotics and antibiotic resistance genes from agricultural soils via soil microbial fuel cells 增塑剂对土壤微生物燃料电池去除农业土壤中抗生素和抗生素抗性基因的影响

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere

Pub Date : 2024-12-01 DOI: 10.1016/j.pedsph.2023.11.001

Huixiang WANG , Xiaoshuai SHEN , Chen ZHANG , Yi SHAO , Hua LI , Jian WU , Yuli YANG , Hailiang SONG

Soil microbial fuel cells (MFCs), a novel ecosystem technology, have recently been intensively studied for antibiotic-polluted soils. However, actual agricultural soils are always contaminated by mixed pollutants, especially plasticizers from extensively used agricultural plastic films. The aim of this study was to investigate the effects of di-2-ethylhexyl phthalate (DEHP), a representative plasticizer in soil, on the removal of sulfadiazine (SDZ), a frequently detected antibiotic in natural environments, and antibiotic resistance genes (ARGs) and microbial community in soil MFCs. Soil MFCs maintained a good antibiotic removal ability even under the influence of residual DEHP and achieved a higher removal performance at higher DEHP concentrations due to enhanced power generation. Specifically, a higher DEHP concentration had a favorable effect on antibiotic removal in soil MFCs, with the SDZ concentration decreased in both the upper and lower layers (from 4.867 ± 0.221 to 0.268 ± 0.021 and 0.293 ± 0.047 mg kg^-1, respectively) of polluted soils. Moreover, a high DEHP concentration significantly promoted the abundance of bacteria associated with electricity generation compared with a lower DEHP concentration, resulting in the promotion of extracellular electron transfer and enhancing SDZ degradation. The increased ARG abundance may be caused by the enrichment of ARG potential hosts brought about by high DEHP concentration, likely due to the increased conjugative transfer frequencies of plasmid RP4 by decreasing cell membrane permeability and increasing reactive oxygen species content. The results revealed the ecological risk of residual DEHP in soil that promotes ARG transmission in soil MFCs, although it has the potential to reduce SDZ toxicity through horizontal gene transfer. We also highlight concerns regarding the management of antibiotics and plasticizers in soil. The negative effects of plasticizers on antibiotic removal should be carefully evaluated when using soil MFCs for the in-situ remediation of antibiotic-contaminated soil.

土壤微生物燃料电池（MFCs）是一种新型的生态系统技术，近年来在抗生素污染土壤中得到了广泛的研究。然而，实际的农业土壤经常受到混合污染物的污染，特别是广泛使用的农用塑料薄膜中的增塑剂。本研究旨在探讨土壤中具有代表性的增塑剂邻苯二甲酸二乙己酯（DEHP）对自然环境中常见的抗生素磺胺嘧啶（SDZ）的去除以及土壤mfc中抗生素抗性基因（ARGs）和微生物群落的影响。即使在残留DEHP的影响下，土壤mfc也保持了良好的抗生素去除能力，并且由于发电量的增强，在更高DEHP浓度下，土壤mfc的去除性能也更高。其中，较高的DEHP浓度对土壤mfc中抗生素的去除效果较好，污染土壤的上层和下层SDZ浓度均下降（分别从4.867±0.221 mg kg-1降至0.268±0.021 mg kg-1和0.293±0.047 mg kg-1）。此外，与较低DEHP浓度相比，高DEHP浓度显著促进了与发电相关的细菌丰度，从而促进了细胞外电子转移，增强了SDZ的降解。ARG丰度的增加可能是由于高DEHP浓度导致ARG潜在宿主的富集，可能是由于质粒RP4通过降低细胞膜通透性和增加活性氧含量而增加了其共轭转移频率。结果表明，土壤中残留DEHP的生态风险促进了ARG在土壤mfc中的传播，尽管它具有通过水平基因转移降低SDZ毒性的潜力。我们还强调对土壤中抗生素和增塑剂管理的关注。在使用土壤mfc对抗生素污染土壤进行原位修复时，应仔细评估增塑剂对抗生素去除的负面影响。

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引用次数: 0

Increased humic materials explain aggregate-protected carbon and nitrogen accumulation in biochar-amended tropical soils 增加的腐殖质物质解释了生物炭修正的热带土壤中团聚体保护的碳和氮积累

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere

Pub Date : 2024-12-01 DOI: 10.1016/j.pedsph.2023.07.006

Emmanuel AMOAKWAH , Mohammad A. RAHMAN , Khandakar R. ISLAM , Kwame A. FRIMPONG , Christian A. PHARES , Louis SACKEY , Isaac ASIRIFI , Emmanuel ARTHUR

Humic materials make important contributions to soil organic carbon (C) and nitrogen (N) accumulation. However, information on the correlation between humic substances and the accumulation of soil aggregate-protected C and N in response to biochar application under tropical agroecosystems is limited. Therefore, a field trial was conducted to elucidate the effects of biochar on soil aggregate properties and humic materials and how these humic compounds affect aggregate-protected C and N in a humid tropical agroecosystem. The treatments included no-biochar control (CK), 15 Mg biochar ha^-1 (BC-15), 30 Mg biochar ha^-1 (BC-30), and 30 Mg biochar ha^-1} + phosphate fertilizer (BC-30+P). The treatments BC-30 and BC-30+P significantly increased the contents of humic materials (humic and fulvic acids) as compared to CK. There was a significant increase in the mean-weight diameter of soil aggregates by 3- and 4-fold in BC-30 and BC-30+P, respectively. Similarly, BC-30 and BC-30+P led to significant increases in soil structural coefficient by 3- and 4-fold, respectively, relative to CK. Significant increases in organic C and N accumulation were observed in the macroaggregates of the biochar-amended soils. Inverse relationships between the degree of polymerization and aggregate-protected C and N were observed, implying that low-molecular-weight aliphatic compounds favor organic C and N accumulation with biochar amendments. The important soil property that contributed to organic C and N accumulation in aggregates was fulvic acid content, which could be used as an early and sensitive indicator to notice early changes in aggregate-protected C and N accumulation in soils of the humid tropics.

腐殖质对土壤有机碳(C)和氮(N)积累有重要贡献。然而，在热带农业生态系统下，生物炭对腐殖质物质与土壤团聚体保护态C、N积累的相关性研究有限。因此，我们进行了一项田间试验，以阐明生物炭对土壤团聚体特性和腐殖质物质的影响，以及这些腐殖质化合物如何影响潮湿热带农业生态系统中保护团聚体的C和N。无生物炭对照（CK）、15 Mg生物炭ha-1 （BC-15）、30 Mg生物炭ha-1 （BC-30）和30 Mg生物炭ha-1 +磷肥（BC-30+P）处理。与对照相比，BC-30和BC-30+P处理显著提高了腐植酸和黄腐酸含量。BC-30和BC-30+P处理土壤团聚体的平均重径分别增加了3倍和4倍。BC-30和BC-30+P处理土壤结构系数较对照分别显著提高3倍和4倍。生物炭处理土壤大团聚体有机碳和氮积累显著增加。聚合程度与聚集体保护C和N呈反比关系，表明低分子量脂肪化合物有利于生物炭修饰的有机C和N积累。富里酸含量是影响团聚体中有机碳氮积累的重要土壤性状，可作为湿润热带土壤团聚体保护下碳氮积累早期变化的早期敏感指标。

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引用次数: 0

Biological nitrogen fixation in paddy soils is driven by multiple edaphic factors and available phosphorus is the greatest contributor 水稻土壤的生物固氮是由多种土壤因子驱动的，速效磷是其中最大的贡献者

IF 5.2 2区农林科学 Q1 SOIL SCIENCE

Pedosphere

Pub Date : 2024-12-01 DOI: 10.1016/j.pedsph.2023.09.002

Tianlong HU , Yanhui ZHANG , Hui WANG , Haiyang JIN , Benjuan LIU , Zhibin LIN , Jing MA , Xiaojie WANG , Qi LIU , Hongtao LIU , Zhe CHEN , Rong ZHOU , Penghui JIN , Jianguo ZHU , Gang LIU , Qicheng BEI , Xingwu LIN , Zubin XIE

Biological nitrogen (N) fixation (BNF) is important for sustainable rice cultivation. Various edaphic factors have been individually evaluated for their effects on BNF in paddy soils. However, no single factor could fully explain the different soil outcomes. Paddy BNF is more likely to be simultaneously influenced to various degrees by combinations of several edaphic factors; however, the relative importance of the interaction of multiple edaphic factors on the regulation of BNF in paddy soils is still unclear. Twenty-seven paddy soil samples with different soil properties were collected from the major rice cropping areas in Southwest and Northeast China to determine the edaphic factors affecting paddy BNF amount. Rice was transplanted into pots filled with paddy soils and grown in a ¹⁵N₂-enriched airtight chamber. Estimation of BNF was based on the measurements of ¹⁵N enrichment in the paddy soils and rice plants at the end of a 77-d incubation period. The BNF amounts ranged from 0.66 to 12.3 kg ha^-1, with a significant positive relationship with available phosphorus (AP) and significant quadratic relationships with available molybdenum (AMo) and total N (TN). Available P explained 42% of the observed variation in BNF, TN explained 17%, and AMo explained 13%. The specific interaction between soil cation exchange capacity and available soil N (as determined by rice N uptake) accounted for 28% of the variation in BNF. The BNF amount was decreased when AP was < 14 mg kg^-1, AMo < 0.09 mg kg^-1, or TN was > 3.2 g kg^-1. These results provide valuable benchmarks that could be used to guide farmers in managing paddy soils to improve the potential contribution of paddy BNF to soil fertility.

生物固氮对水稻的可持续栽培具有重要意义。不同的土壤因子对水稻土BNF的影响分别进行了评价。然而，没有一个单一的因素可以完全解释不同的土壤结果。稻田生物多样性更可能同时受到多种土壤因子组合的不同程度影响；然而，多种土壤因子相互作用对水稻土BNF调控的相对重要性尚不清楚。在西南和东北主要水稻种植区采集了27个不同土壤性质的水稻土样品，以确定影响水稻BNF量的土壤因子。水稻移栽到充满水稻土的花盆中，在富含15n2的密闭室中生长。BNF的估算基于水稻土壤和水稻植株在77 d孵育期结束时15N富集量的测量。土壤BNF含量变化范围为0.66 ~ 12.3 kg ha-1，与有效磷（AP）呈显著正相关，与有效钼（AMo）和总氮（TN）呈显著二次相关。有效磷解释了观测到的BNF变化的42%，TN解释了17%，AMo解释了13%。土壤阳离子交换量与土壤有效氮（由水稻氮素吸收决定）之间的特定相互作用占土壤氮素变化的28%。AP = lt时，BNF量减少；14 mg kg-1, AMo <；0.09 mg kg-1, TN = >；3.2 g kg-1。这些结果可为指导农民管理水稻土提供有价值的基准，以提高水稻BNF对土壤肥力的潜在贡献。

{"title":"Biological nitrogen fixation in paddy soils is driven by multiple edaphic factors and available phosphorus is the greatest contributor","authors":"Tianlong HU , Yanhui ZHANG , Hui WANG , Haiyang JIN , Benjuan LIU , Zhibin LIN , Jing MA , Xiaojie WANG , Qi LIU , Hongtao LIU , Zhe CHEN , Rong ZHOU , Penghui JIN , Jianguo ZHU , Gang LIU , Qicheng BEI , Xingwu LIN , Zubin XIE","doi":"10.1016/j.pedsph.2023.09.002","DOIUrl":"10.1016/j.pedsph.2023.09.002","url":null,"abstract":"<div><div>Biological nitrogen (N) fixation (BNF) is important for sustainable rice cultivation. Various edaphic factors have been individually evaluated for their effects on BNF in paddy soils. However, no single factor could fully explain the different soil outcomes. Paddy BNF is more likely to be simultaneously influenced to various degrees by combinations of several edaphic factors; however, the relative importance of the interaction of multiple edaphic factors on the regulation of BNF in paddy soils is still unclear. Twenty-seven paddy soil samples with different soil properties were collected from the major rice cropping areas in Southwest and Northeast China to determine the edaphic factors affecting paddy BNF amount. Rice was transplanted into pots filled with paddy soils and grown in a <sup>15</sup>N<sub>2</sub>-enriched airtight chamber. Estimation of BNF was based on the measurements of <sup>15</sup>N enrichment in the paddy soils and rice plants at the end of a 77-d incubation period. The BNF amounts ranged from 0.66 to 12.3 kg ha<sup>-1</sup>, with a significant positive relationship with available phosphorus (AP) and significant quadratic relationships with available molybdenum (AMo) and total N (TN). Available P explained 42% of the observed variation in BNF, TN explained 17%, and AMo explained 13%. The specific interaction between soil cation exchange capacity and available soil N (as determined by rice N uptake) accounted for 28% of the variation in BNF. The BNF amount was decreased when AP was < 14 mg kg<sup>-1</sup>, AMo < 0.09 mg kg<sup>-1</sup>, or TN was > 3.2 g kg<sup>-1</sup>. These results provide valuable benchmarks that could be used to guide farmers in managing paddy soils to improve the potential contribution of paddy BNF to soil fertility.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 993-1001"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46666972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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