Supported by the National Natural Science Foundation of China (No. 41807106) and the Earmarked Fund for Modern Agro-industry Technology Research System-Green Manure (No. CARS-22)
紫云英翻压还田是南方传统稻田土壤培肥增产的主要措施。依托连续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>2 mm土壤团聚体含量最高,占总量的61.12%~68.53%,其次是2~0.25 mm粒级团聚体。紫云英翻压还田较单施化肥处理提高了>2 mm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>0.053 mm团聚体中有机碳含量和各个粒级中全氮含量,其中粒级>0.25 mm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了19.42%~37.09%有机碳和22.31%~40.13%氮的总储量,其中粒级>2 mm团聚体中碳氮储量随着紫云英翻压量的增加而增加。>2 mm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。紫云英翻压还田同时提高了各团聚体中1 630/2 850+2 940和1 720/2 850+2 940相对比值,其中>2 mm和2~0.25 mm粒级团聚体中1 630/2 850+2 940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,增加有机碳和全氮在土壤团聚体中的储存,还提高了团聚体有机碳的活性和稳定性,从而有助于提升稻田土壤肥力。
【Objective】The application of Chinese milk vetch to paddy soil is an effective practice to improve 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 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 showed that the >2 mm soil aggregate was dominant (61.12%～68.53%)and followed by the 2～0.25 mm fraction. The application of Chinese milk vetch increased the percentage of the soil aggregate size (>2 mm) by 5.93%～9.91%. Also, the contents of organic carbon and total nitrogen in the >0.053 mm aggregates increased with the application rate of the treatment. There was a significant positive correlation between the contents of organic carbon and total nitrogen and the application rates of Chinese milk vetch. Interestingly, the application of Chinese milk vetch increased the total storage of organic carbon and nitrogen by 19.42%～37.09% and 22.31%～40.13%, respectively. Moreover, the distribution of organic carbon and nitrogen in >2 mm soil aggregate was also increased after the treatment. FTIR spectroscopic analysis revealed that the relative contents of aliphatic and aromatic organic carbons in soil aggregates were increased after treatment, and there was a significant positive correlation between the N-H functional groups and the application rate of Chinese milk vetch. In addition, the relative intensities of 1 630/2 850+2 940 and 1 720/2 850+2 940 in different soil aggregates were increased. There was a significant positive correlation between the values of the relative intensity of 1 630/2 850+2 940 in both aggregate sizes of >2 mm and 2～0.25mm and the application of Chinese milk vetch.【Conclusion】The application of Chinese milk vetch to paddy soil improved the distribution of soil aggregates, increased the activity and stability of organic carbon, and enhanced the organic carbon and nitrogen storage in soil aggregates. These positive impacts of Chinese milk vetch played an important role in enhancing paddy soil fertility.
王慧,韩上,唐杉,程文龙,卜容燕,李敏,武际,王允青,曹卫东.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,2023,60(3):868-880. DOI:10.11766/trxb202106090303 WANG Hui, HAN Shang, TANG Shan, CHENG Wenlong, BU Rongyan, LI Min, WU Ji, WANG Yunqing, CAO Weidong. Continuous Multi-year Application of Chinese Milk Vetch in Paddy Soil and Its Effect on Soil Aggregates Distribution and Their Carbon and Nitrogen Content[J]. Acta Pedologica Sinica,2023,60(3):868-880.复制