水稻秸秆钾与化肥钾释放与分布特征模拟研究
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

公益性行业(农业)科研专项(201203013)和国家土壤有机质提升项目资助


Study on Characteristics of Release and Distribution of Rice Straw Potassium and Chemical Potassium by Lab Simulation
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    通过室内恒温(25℃)培养试验,研究了不同用量水稻秸秆钾和化肥钾在水-土体系中的释放与分布特征。结果显示,施用水稻秸秆钾300 mg/kg处理,表层水溶液pH经历了一个弱酸化到弱碱化的过程,而化肥钾的施用则降低了表层水溶液的pH。稳定态时相关分析表明,pH与水稻秸秆钾用量正相关(R2 = 0.938**),与化肥钾负相关(R2 = 0.993**)。试验开始当天外加300 mg/kg化肥钾处理表层水溶液钾浓度达到最大值,为50.64 mg/L,随后呈下降趋势。5天时土壤缓效钾含量达到最大值414.51 mg/kg,并保持相对稳定,而速效钾钾含量继续升高,25天后变化较小。外加300 mg/kg水稻秸秆钾处理表层水钾浓度在第3天达到最大值,为52.70 mg/L,之后呈下降趋势,但在相同时期时,秸秆钾处理表层水溶液钾含量高于化肥钾处理。不同钾素用量结果表明,施钾量为150 mg/kg时,两种来源钾主要以交换态钾存在,其次是水溶态钾;随着钾素用量的增加,钾离子被土壤固定,且在等量条件下,水稻秸秆钾处理的交换态钾比例高于化肥钾处理,而非交换态钾所占比例则相反。因此,在一定钾素用量范围内,土壤对秸秆钾和化肥钾的固定没有显著差异,而当用量超过阈值时,秸秆的投入会降低土壤对钾素的固定。

    Abstract:

    In this paper, laboratory incubated experiments (25℃) were carried out to study the characteristics of release and distribution on different amount of rice straw potassium (K) and chemical potassium (K) in the water-soil system. Results showed that pH of surface water dealing with application of straw potassium 300 mg/kg through a process, namely from weak acidification to weak alkalization. Nevertheless,treatment with chemical potassium reduced pH of flooded solution. In steady situation, pH of surface solution had a positive correlation (R2 = 0.938**) with rice straw potassium, but a negative correlation with chemical potassium (R2 = 0.993**). For the treatment with 300 mg/kg chemical potassium, surface water soluble K was highest (50.64 mg/L) on day 0, and then tended to decrease. Unlike surface water soluble K, slowly available K reached the maximum value (414.51 mg/kg) on day 5, and then maintained dynamic stability. However, available K content continued to rise before day 25. For the treatment adding 300 mg/kg rice straw potassium, surface water soluble K first reached the maximum value (52.70 mg/L) on day 3 and then decreased gradually. For the same time, K concentration of surface water adding 300 mg/kg straw potassium was higher than that of chemical potassium treatment. Different potassium rates results indicated that when the amount of applied potassium was 150 mg/kg, two kinds of potassium mainly existed as exchangeable K, followed by soluble K. With the increment of extra potassium, fixation-K began to be increased. For the equivalent potassium rate, the proportion of exchangeable K was higher in the treatment with rice straw potassium than the treatment with chemical potassium whereas the proportion of non-exchangeable K of them were on the contrary. There were no significant differences on the fixation-K of soil between straw potassium and chemical potassium when the amount of added potassium was within the threshold. When the amount of extra potassium was beyond the threshold, adding straw to soil could reduce K fixation.

    参考文献
    相似文献
    引证文献
引用本文

李继福,任 涛,鲁剑巍,丛日环,李小坤,马晓晓.水稻秸秆钾与化肥钾释放与分布特征模拟研究[J].土壤,2013,45(6):1017-1022. LI Ji-fu, REN Tao, LU Jian-wei, CONG Ri-huan, LI Xiao-kun, MA Xiao-xiao. Study on Characteristics of Release and Distribution of Rice Straw Potassium and Chemical Potassium by Lab Simulation[J]. Soils,2013,45(6):1017-1022

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2014-01-17
  • 出版日期: