连续多年紫云英翻压还田对稻田土壤团聚体组成及其碳氮的影响
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作者单位:

1.安徽省农业科学院土壤肥料研究所;2.中国农业科学院农业资源与农业区划研究所

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S158.5

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(41807106)和现代农业产业技术体系建设专项资金(CARS-22)Supported by the National Science Foundation of China (No.41807106) and the earmarked fund for Modern Agro-industry Technology Research System-Green manure (CARS-22)*通讯作者Corresponding author, E-mail: wuji338@163.com


The Soil Aggregates Distributions and Their Carbon and Nitrogen by the Continuous Multi-year Application of Chinese Milk Vetch in Paddy Soil
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Affiliation:

1.Soil and Fertilizer Institute,Anhui Academy of Agricultural Sciences,Anhui Provincial Key Laboratory of Nutrient Cycling,Resource Environment;2.Institute of Agricultural Resources and regional Planning,Chinese Academy of Agricultural Sciences

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    摘要:

    紫云英翻压还田是南方传统稻田土壤培肥增产的措施。本文依托12年田间定位试验,通过设置CK(不施化肥,紫云英不还田)、单施化肥(GM0)和4个梯度的紫云英翻压量(GM1-4)处理,分析了连续多年紫云英翻压还田对稻田土壤团聚体组分、团聚体中碳氮含量和储量,并通过傅里叶红外光谱测定各粒级有机官能团类型及相对含量,探讨连续多年紫云英翻压还田对土壤团聚体组分及其碳氮分布的影响。结果表明,在该土壤中粒级>2mm土壤团聚体含量最高,占总量的61.12%~68.53%,其次是2-0.25mm粒级团聚体。紫云英翻压还田比单施化肥处理提高了>2mm粒级团聚体所占百分比5.93%~9.91%。紫云英翻压还田提高了粒级>0.053mm团聚体中有机碳含量和各个粒级中全氮含量,其中粒级>0.25mm团聚体的碳氮含量与紫云英翻压量之间呈现出显著正相关关系。紫云英翻压还田分别显著提高总有机碳和全氮的储量19.42%~37.09%和22.31%~40.13%,其中粒级>2mm团聚体中碳氮储量随着紫云英翻压量的增加而增加。>2mm粒级团聚体中碳氮的分布也随着紫云英的翻压还田而增加。通过傅里叶红外光谱认为土壤各粒级团聚体中脂肪族有机碳和芳香族有机碳以及N-H官能团含量也随着紫云英翻压还田而增加,其中N-H官能团含量与紫云英翻压量之间呈现出显著的正相关关系。紫云英翻压还田还提高各团聚体中1630/2850+2940和1720/2850+2940相对比值,提高团聚体对有机碳的物理保护作用,其中>2 mm和2-0.25 mm粒级团聚体中1630/2850+2940相对强度比值与紫云英翻压量之间均呈显著性相关关系。综上,紫云英翻压还田不仅有利于改善稻田土壤团聚体组分,还提高了团聚体有机碳的活性和稳定性以及增加氮素在土壤团聚体中的储存,从而有助于提升稻田土壤肥力。

    Abstract:

    【Objective】The application of Chinese milk vetch to paddy soil is an effective practice to improve the soil fertility and maintain high and stable yields in South China. The soil aggregates distributions and their carbon and nitrogen content may be influenced by the continuous multi-year application of Chinese milk vetch.【Method】We investigated the effects of 12 years of Chinese milk vetch returned to soil on soil aggregate size distribution and aggregate-associated carbon and nitrogen by setting with six treatments including with CK (no fertilizers and no Chinese milk vetch applied), GM0 (fertilizer only) and four gradients of Chinese milk vetch applied (GM1-4). The aggregate size distribution and the content and storage of organic carbon and nitrogen in the soil aggregate were analyzed. Also the types and relative intensity of organic functional groups in different size classes were determined using Fourier Transform Infrared spectrometer (FTIR).【Result】The results were shown that the soil aggregate content (>2mm) was dominant (the highest) and 61.12%~68.53%, followed by the 2-0.25mm. The application of Chinese milk vetch increased the percentage of the soil aggregate size (>2mm) by 5.93%~9.91%. The content of the organic carbon in >0.053mm aggregates and total nitrogen in aggregates were increased with the increase of the application of Chinese milk vetch. There were significant positive correlation between the content of organic carbon and total nitrogen and the application of Chinese milk vetch. The applications of Chinese milk vetch increased the total storage of organic carbon and nitrogen by 19.42%~37.09%and 22.31%~40.13%, respectively. The distribution of the organic carbon and nitrogen in >2mm soil aggregate was increased by the application of Chinese milk vetch. The relative content of the aliphatic organic carbon and aromatic organic carbon in soil aggregates were increased with the application of Chinese milk vetch by the FTIR spectroscopy. And there were significant positive correlation between the N-H functional groups and the application of Chinese milk vetch. The application of Chinese milk vetch increased the values of the relative intensity of 1630/2850+2940 and 1720/2850+2940 in different soil aggregates to improve the physical protection on the organic carbon. There were significant positive correlation between the values of the relative intensity of 1630/2850+2940 in both aggregate sizes of >2mm and 2-0.25mm and the application of Chinese milk vetch.【Conclusion】Hence, the application of Chinese milk vetch incorporated improved the distribution of paddy soil aggregates and increased the activity and the stability of organic carbon and the organic carbon and nitrogen storage in soil aggregates to enhanced the paddy soil fertility.

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王慧,韩上,唐杉,程文龙,卜容燕,李敏,武际,王允青,曹卫东.连续多年紫云英翻压还田对稻田土壤团聚体组成及其碳氮的影响[J].土壤学报,,[待发表]
WANG Hui, HAN Shang, TANG Shan, CHENG Wenlong, BU Rongyan, LI Min, WU Ji †,WANG Yunqing, CAO Weidong. The Soil Aggregates Distributions and Their Carbon and Nitrogen by the Continuous Multi-year Application of Chinese Milk Vetch in Paddy Soil[J]. Acta Pedologica Sinica,,[In Press]

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