| 松辽平原高产农田土壤结构性对冻结的响应及机理研究 |
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| 引用本文： | 于博,赵兰坡,王鸿斌,张志丹,姜亦梅,王舒婷.松辽平原高产农田土壤结构性对冻结的响应及机理研究[J].水土保持学报,2012,26(4):172-177. |
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| 作者姓名： | 于博 赵兰坡 王鸿斌 张志丹 姜亦梅 王舒婷 |
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| 作者单位： | 1. 吉林农业大学资源与环境学院,长春,130118
2. 吉林农业大学中药材学院,长春,130118 |
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| 基金项目： | 国家自然科学基金项目“松辽平原玉米带高产土壤的肥力特征及形成机理研究”(31071862) |
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| 摘 要： | 以松辽平原玉米带耕作区高产田(平面型)与低产田(波浪型)0-20cm耕层土壤为研究对象,采用室内模拟冻融实验方法,设置不同冻结频率和不同含水量条件,研究高产田土壤的结构性对冻结的响应,以及土壤结构特征的变化。结果显示:冻融循环对高产田(平面型)和低产田(波浪型)各粒级风干团聚体、水稳定性团聚体比例的影响均达到显著水平(p<0.01),而含水量仅对小于5mm的水稳性团聚体分布比例有显著影响(p<0.01)。冻融循环次数和含水量对风干团聚体和水稳性团聚体的MWD以及>0.25mm团聚体的保存率均有显著影响(p<0.01),与水稳性团聚体相比,风干团聚体对冻融交替更加敏感。冻融循环对高产田与低产田风干团聚体MWD的影响都显著(p<0.01)。此外,在冻结条件下,土壤含水量越高对于高产田团聚体的破坏性越强;冻结对高产田土壤耕层团聚体有一定的分散作用,对低产田土壤耕层团聚体具有一定的团聚作用,另外冻融循环可以加剧大粒级风干团聚体的破坏作用。
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| 关 键 词： | 黑土 土壤结构 团聚体 冻融交替 高产田 |
Responses of Soil Structure Characteristics of High-yield Farmland to Freeze and Its Mechanism in Corn Belt of the Songliao Plain |
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| YU Bo,ZHAO Lan-po,WANG Hong-bin,ZHANG Zhi-dan,JIANG Yi-mei,WANG Shu-ting.Responses of Soil Structure Characteristics of High-yield Farmland to Freeze and Its Mechanism in Corn Belt of the Songliao Plain[J].Journal of Soil and Water Conservation,2012,26(4):172-177. |
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| Authors: | YU Bo ZHAO Lan-po WANG Hong-bin ZHANG Zhi-dan JIANG Yi-mei WANG Shu-ting |
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| Institution: | 1.College of Resources and Environment,Jilin Agricultural University,Changchun 130118; 2.College of Chinese Herbal Medicine,Jilin Agricultural University,Changchun 130118) |
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| Abstract: | The 0-20 cm topsoil of high-yield farmland(flat interface) and low-yield farmland(wavy interface) was taken as the studied object,which adopted laboratory simulation of freeze-thaw test method in the corn belt of the Songliao plain farming area,setting up different frequency and different water content freeze conditions,and which researched responses of soil structure characteristics of high-yield farmland to freeze,and changes of topsoil structure characteristics.The results show: The freeze-thaw cycle could markedly influence the proportion of aggregates and water-stable aggregate in high-yield farmland(flat interface) and low-yield farmland(wavy interface)(p<0.01),however water content just markedly influenced the proportion of water-stable aggregate which particle size was <5 mm(p<0.01).Freeze-thaw cycle frequency and the water content markedly influenced MWD of water-stable aggregate and preserving rate of aggregates which particle size was >0.25 mm(p<0.01),and aggregates were more sensitive than water-stable aggregate in the freeze-thaw cycle.Freeze-thaw cycle markedly influenced the MWD of high-yield farmland and low-yield farmland(p<0.01).In addition,in freezing conditions,the higher soil water content,the stronger destructive in high-yield farmland,freezing had certain dispersion effect on aggregate in topsoil of high-yield farmland,contrarily had certain reunited effect on aggregate in topsoil of low-yield farmland.Otherwise freeze-thaw cycle could increase the destruction of large size aggregate. |
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| Keywords: | black soil soil structure soil aggregate freeze-thaw cycle high-yield farmland |
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