土壤钾素解吸模型及其特征值的作物效应
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中-加合作项目(Fujian-13);福建省财政专项基金(Y015)资助


SOIL K DESORPTION MODEL AND CROP RESPONSES TO ITS EIGENVALUES
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    摘要:

    土壤钾素可解吸数量和强度及其缓冲系数是评价土壤供钾能力的重要指标。通过室内解吸试验研究土壤钾素解吸特性及其解吸特征值,应用盆栽和田间试验探讨土壤钾素解吸特征值与供试蔬菜鲜重产量和吸钾量的相关性。应用土壤镉解吸模型对7种土壤32个钾素解吸试验表明,土壤镉解吸模型能很好地模拟土壤钾素解吸动态特征,相关系数均达到显著水平。菜心和空心菜的盆栽和田间试验均表明,土壤钾可解吸量Q、土壤溶液初始钾浓度CliC1/∂比值等解吸特征值与供试蔬菜吸钾量或鲜重产量有显著的抛物线型关系。空心菜盆栽试验还表明,这种抛物线型关系与土壤类型无关,说明QCliC1/∂比值确实反映了土壤供钾能力。以最高产量的90%为基础,根据抛物线型关系可求得QCli的临界值。解吸模型研究为评价土壤钾素生物有效性和钾素肥力临界指标提供了一种新方法。

    Abstract:

    Desorbable quantity and desorption intensity of soil K and their buffer power are important indices in evaluation of soil K supply capacity. An indoor soil K desorption experiment was carried out to explore soil K desorption characteristics and their eigenvalues,and pot and field experiments as well to study relationships of the eigenvalues with crop response in yield. A desorption model for soil cadmium was used to fit 7 types of soils in 32 K desorption experiments. Results show that the model fitted well with correlation coefficients reaching the level of significance. In the pot and field experiments with water spinach(Iponoea aqatica)and flowering Chinese cabbage(Brassica parachinensis),desorption eigenvalues,like quantity of desorbable soil K(Q),initial K concentration in the soil solution(Cli)and concentration/buffer power ratio(C1/∂),were related to total K uptake or yield(fresh weight)of the vegetables,showing apparent parabola curves. Furthermore,the pot experiment with water spinach indicated that the parabola relationships fitted all the soils regardless of soil type,suggesting that Q,Cli and C1/∂ indexes indeed reflect K supply capacity of soils. Based on the parabola relationships and 90% of the maximum yield of the investigated vegetables under field conditions,critical indices of Q and Cli were worked out,to be 104 mg kg-1 and 31 mg L-1 respectively for flowering Chinese cabbage,and 207 mg kg-1 and 82 mg L-1 respectively for water spinach. If soils have Q or CCli determined well beyond the critical index,they do not need Kfertilization. The findings indicate that the proposed model can be cited as a new method to evaluate availability and critical index of soil K.

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章明清,颜明娟,林琼,李娟,陈子聪,吴启堂,陈防.土壤钾素解吸模型及其特征值的作物效应[J].土壤学报,2008,45(1):120-129. DOI:10.11766/trxb200612010116 Zhang Mingqing, Yan Mingjuan, Lin Qiong, Li Juan, Chen Zhichong, Wu Qitang, Chen Fang. SOIL K DESORPTION MODEL AND CROP RESPONSES TO ITS EIGENVALUES[J]. Acta Pedologica Sinica,2008,45(1):120-129.

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  • 收稿日期:2006-12-01
  • 最后修改日期:2007-05-17
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  • 在线发布日期: 2013-05-10
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