Jun Jiang , Feng Zhang , Enze Xie , Ruhai Wang , Yiyi Deng , Tianhua Feng , Xueqing Zhang , Xianli Xie , Renkou Xu
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Although there was an extremely significant correlation between the pH values obtained by the two methods (<em>R</em><sub><em>adj</em></sub><sup><em>2</em></sup>=0.15, <em>P</em> = 1.77 ×10<sup>−4</sup>, n = 81), extrapolating these results across different soil types proved challenging due to the specificity of paddy soils. The <em>in-situ</em> pH values of aerobic paddy soils were 0.52 units lower than the laboratory values, with an extremely significant correlation (<em>R</em><sub><em>adj</em></sub><sup><em>2</em></sup>=0.67, <em>P</em> = 5.95 ×10⁻²¹, n = 81). <em>In-situ</em> pH mapping of farmland soils under both anaerobic and aerobic conditions revealed that the paddy soils in northwest Jinggangshan County, along with the majority of aerobic paddy soils in the study areas, exhibited acidification and aluminum-induced phytotoxicity. 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引用次数: 0
摘要
用实验室标准方法测得的土壤pH值不能准确反映土壤的实际酸度。在本研究中,我们比较了中国亚热带阆溪、玉江和井冈山县厌氧和好氧农田土壤的pH值,采用原位和实验室标准方法测量。结果表明,厌氧ultisol衍生水稻土的原位pH值显著高于实验室值。虽然两种方法得到的pH值之间存在极显著的相关性(Radj2=0.15, P = 1.77 ×10−4,n = 81),但由于水稻土的特殊性,将这些结果外推到不同土壤类型是具有挑战性的。好氧水稻土的原位pH值比实验室值低0.52个单位,相关性极显著(Radj2=0.67, P = 5.95 ×10⁻²¹,n = 81)。在厌氧和好氧条件下,井冈山西北地区水稻土以及研究区大部分好氧水稻土均表现出酸化和铝致植物毒性。这些研究结果为估计好氧和厌氧轮作条件下水稻土的原位土壤pH值提供了有价值的见解,为华南酸性水稻土地区不同耕作阶段的实际土壤pH条件提供了更准确和有效的表征。
In-situ and laboratory determined Ultisol-derived paddy soil pH varied with flooding condition in subtropical China
Soil pH measured by laboratory standard method does not accurately reflect its actual acidity. In this study, we compared the pH values of anaerobic and aerobic farmland soils in Langxi, Yujiang, and Jinggangshan Counties in subtropical China, measured using in-situ and laboratory standard methods. The results showed that the in-situ pH values of anaerobic Ultisol-derived paddy soils were significantly higher than the laboratory values. Although there was an extremely significant correlation between the pH values obtained by the two methods (Radj2=0.15, P = 1.77 ×10−4, n = 81), extrapolating these results across different soil types proved challenging due to the specificity of paddy soils. The in-situ pH values of aerobic paddy soils were 0.52 units lower than the laboratory values, with an extremely significant correlation (Radj2=0.67, P = 5.95 ×10⁻²¹, n = 81). In-situ pH mapping of farmland soils under both anaerobic and aerobic conditions revealed that the paddy soils in northwest Jinggangshan County, along with the majority of aerobic paddy soils in the study areas, exhibited acidification and aluminum-induced phytotoxicity. These findings provide valuable insights into estimating the in-situ soil pH of paddy soils under anaerobic and aerobic rotations, providing a more accurate and efficient representation of actual soil pH conditions during different cultivation stages in the acidic paddy soil regions of southern China.
期刊介绍:
Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research:
The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.