| 小麦–玉米种植制度下长期施钾对土壤钾素Q/I关系的影响 |
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| 引用本文： | 张会民,徐明岗,王伯仁,黄绍敏,杨学云.小麦–玉米种植制度下长期施钾对土壤钾素Q/I关系的影响[J].植物营养与肥料学报,2009,15(4):843-849. |
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| 作者姓名： | 张会民 徐明岗 王伯仁 黄绍敏 杨学云 |
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| 作者单位： | 1.河南科技大学农学院,河南洛阳 471003; |
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| 基金项目： | 国家重点科技支撑计划项目，基础性工作专项项目，河南科技大学博士科研启动基金 |
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| 摘 要： | 为评价长期施肥条件下土壤钾素容量和强度（Q/I）关系，采用Q/I法研究了小麦–玉米种植制度下3类土壤（塿土、潮土和红壤），连续15年不施钾（NP）和施钾（NPK）土壤钾素Q/I关系的变化及其参数与土壤性质变化的关系。结果表明，长期施钾土壤K+平衡活度比（AR0）、土壤活性钾（KL）、非专性吸附钾（-△K0）和专性吸附钾（KX）均较不施钾土壤的高，其中，施钾后AR0和-△K0值提高幅度最大的是红壤，分别提高13.78和12.17倍；15年连续施用钾肥对红壤钾位缓冲容量（PBC）影响不明显，塿土和潮土长期施钾处理PBC值显著降低（17 %～20 %）。不施钾土壤K+和Ca2++Mg2+交换自由能（-△G）（13.69～19.33 kJ/mol）高于施钾土壤（12.15～12.81 kJ/mol）；土壤钾素Q/I参数与土壤1 mol/L HNO3浸提K、K+饱和度和有机质含量等存在显著相关关系。土壤钾素Q/I参数能科学评价土壤的供钾状况。连续15年施钾肥土壤供钾能力较高，长期不施钾肥土壤钾素亏缺明显，尤其是潮土和红壤易出现缺钾。
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| 关 键 词： | 小麦– |
| 收稿时间： | 2008-08-20 |
Effects of long-term potassium application on Q/I relationship of potassium in soil under wheat-corn cropping system |
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| ZHANG Hui-min,XU Ming-gang,WANG Bo-ren,HUANG Shao-min,YANG Xue-yun.Effects of long-term potassium application on Q/I relationship of potassium in soil under wheat-corn cropping system[J].Plant Nutrition and Fertilizer Science,2009,15(4):843-849. |
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| Authors: | ZHANG Hui-min XU Ming-gang WANG Bo-ren HUANG Shao-min YANG Xue-yun |
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| Institution: | 1.College of Agronomy,Henan University of Science and Technology,Luoyang 471003,China; |
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| Abstract: | Quantity/intensity (Q/I) relationship of potassium (K) in soil was evaluated under a long-term K fertilization experiment. Soil samples collected from the NP and NPK treatments in the three soils (manural loess soil, fluvo-aquic soil and red soil) were analyzed for revealing the Q/I relationship of K, and the relationships between Q/I parameters and soil properties using Q/I approach under a 15 year wheat-corn cropping system. The values of K+ equilibrium activi-ty ratio (AR0), soil labile K (KL), non-specific K (-△K0), and specific K (KX) in the NPK treatments are larger than those in the NP treatments. The ARo and - △K0 values in the NPK treatments are 13.78 and 12.17 times larger than those in the NP treatments in red soil. The potential buffering capacity (PBC) is decreased (ranging from 17% to 20%) in the NPK treatments in manural loess soil and fluvo-aquic soil, and is not changed in red soil compared with those in the NP treatments. Free energies of K+ exchange for Ca2+ and Mg3+ (- △G) in the treatments with K fertiliza-tion are lower than those in the treatments without K application (12.15～12.81 vs 13.69～19.33 kJ/mol). There are significant correlations between the Q/I parameters and the 1 mol/L HNO3 extractable K, K+ saturation and soil organic matter. The Q/I parameters provide useful information for understanding the soil K status. Soil K supplying power is in-creased due to the long-term K fertilization, while, continuous cropping without K inputs could cause the remarkable de-pletion of available K especially in the fluvo-aquic soil and red soil. |
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| Keywords: | wheat-corn cropping system long-term K fertilization red soil fluvo-aquic soil manural loess soil Q/I relationship |
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