• ISSN 1008-505X
  • CN 11-3996/S
王少博, 曹亚倩, 冯倩倩, 郭亮亮, 梁海, 王雪洁, 韩惠芳, 宁堂原. 保护性耕作对棕壤粒径分形特征及碳氮比分布的影响[J]. 植物营养与肥料学报, 2019, 25(5): 792-804. DOI: 10.11674/zwyf.18157
引用本文: 王少博, 曹亚倩, 冯倩倩, 郭亮亮, 梁海, 王雪洁, 韩惠芳, 宁堂原. 保护性耕作对棕壤粒径分形特征及碳氮比分布的影响[J]. 植物营养与肥料学报, 2019, 25(5): 792-804. DOI: 10.11674/zwyf.18157
shu
WANG Shao-bo, CAO Ya-qian, FENG Qian-qian, GUO Liang-liang, LIANG Hai, WANG Xue-jie, HAN Hui-fang, NING Tang-yuan. Impacts of conservation tillage on soil particulate composition and distribution of soil carbon and nitrogen in brown soil[J]. Journal of Plant Nutrition and Fertilizers, 2019, 25(5): 792-804. DOI: 10.11674/zwyf.18157
Citation: WANG Shao-bo, CAO Ya-qian, FENG Qian-qian, GUO Liang-liang, LIANG Hai, WANG Xue-jie, HAN Hui-fang, NING Tang-yuan. Impacts of conservation tillage on soil particulate composition and distribution of soil carbon and nitrogen in brown soil[J]. Journal of Plant Nutrition and Fertilizers, 2019, 25(5): 792-804. DOI: 10.11674/zwyf.18157
shu

保护性耕作对棕壤粒径分形特征及碳氮比分布的影响

Impacts of conservation tillage on soil particulate composition and distribution of soil carbon and nitrogen in brown soil

    摘要
  • 摘要:
    目的 分析长期不同耕作措施下棕壤土粒径分布的非均匀性和异质性变化特征，可为农田土壤发育过程以及科学合理耕作提供理论支撑。
    方法 本试验基于山东农业大学农学试验站长期定位的保护性耕作试验田(始于2002)，试验主要耕作措施有翻耕、免耕和深松3种，还田方式为秸秆全量还田和不还田。采用激光粒度分析仪(LS13320)，测定小麦−玉米轮作系统中0—40 cm 土层中的颗粒分布，应用土壤分形理论解析土壤颗粒含量、土壤质地颗粒分布状况及耕作措施和秸秆还田调控土壤颗粒分布的作用。
    结果 土壤粒径的基本特征分布中，粘粒体积百分比表现为免耕>深松>初始土样>翻耕，秸秆还田>无秸秆还田，可见长期定位保护性耕作措施下，免耕秸秆还田增加了土壤粘粒含量，降低了土壤中C/N比值，较低的C/N值促进土壤碳氮的分解从而增加土壤的C、N含量；土壤多重分形参数中，D(1)、D(1)/D(0)、D(2)、Δα值都表现为深松和免耕显著高于翻耕处理，说明深松与免耕加剧了土壤颗粒细化，增进了土壤颗粒的异质性；深松秸秆还田加剧了土壤的非均匀程度，增强土壤结构稳定性，对土壤结构有一定的改良作用。土壤粘粒体积百分比与D(1)/D(0)呈显著负相关(P<0.05)，土壤粉粒体积百分比与Δf呈显著负相关(P<0.05)，土壤砂粒体积百分比与Δf呈正相关(P<0.05)。表明土壤多重分形参数可作为表征土壤颗粒分布、土壤性质的潜在指标。
    结论 多重分形参数中D(1)、D(1)/D(0)、D(2)、Δα各处理间表现出差异，深松秸秆还田处理在细微程度上反映了保护性耕作措施的长期影响效果，免耕秸秆还田处理中土壤粘粒与土壤C/N呈极显著负相关，免耕秸秆还田促进粘粒增加，降低了土壤的C/N值，从而增加了土壤有机质及全氮的含量。多重分形参数对表征土壤性质具有重要的指导意义。

     

    Abstract:
    Objectives To analyze the impact of long-term conservation tillage in brown soil on soil particulate composition and heterogeneity variation characteristics and explore ways to promote sustainable crop production while maintaining soil quality.
    Methods A laser particle size( LS13320) analyzer was used to measure the particle size distribution of soil samples. The soil samples were collected from the top 0−40 cm soil depth of six treatments in a wheat−maize rotation system in 2006 and 2007, respectively, in the long-term tillage experiment on brown soil in Shandong Agricultural University Experimental Station. The tillage treatments included conventional tillage, no-till, and subsoiling tillage. Straw incorporation included complete return and straw removal. Soil particle fractionation was used to analyze soil particulate composition and its relationship with crop management.
    Results On the characteristics of soil particulate size, the percentage of clay particulates was no-till > subsoiling > conventional tillage, and straw returning >the original soil> straw removal. Under the long-term continuous conservation tillage, clay particulates increased in the no-till straw returning, while soil C/N ratio reduced. The lower C/N ratio promotes decomposition of soil carbon and nitrogen. Values of soil multifraction parameters, D(1)、D(1)/D(0)、D(2) and Δa, showed increase in subsoiling tillage and no-till compared to conventional tillage, demonstrating the benefits of the subsoiling and no-till to soil particulate refinement, and improvement of soil particle heterogeneity. Subsoiling with straw returning increased soil particle aggregate inhomogeneity, enhanced soil structure stability and overall soil physical properties.
    Conclusions Soil clay particulate and C/N ratio were significantly negatively correlated with no-till and straw returning, with increasing soil N and total N content. Multifraction parameters are useful indicators of soil properties.

     

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