冬种绿肥对水稻土硝化作用的影响
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国家绿肥产业技术体系项目(CARS-22)、江苏省自然科学基金项目(SBK2019042713)和中国农业科学院科技创新工程项目资助


Impacts of Plantation of Winter Green Manure Crops on Soil Nitrification in Paddy Soil
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Supported by the Program of China Agriculture Research System - Green Manure (No. CARS-22), the Natural Science Foundation of Jiangsu Province of China (No. SBK2019042713), and the Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences

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    摘要:

    冬闲田种植绿肥是传统的水稻土培肥增产措施,但绿肥-水稻种植系统中,不同绿肥种类对硝化作用的影响规律及调控机制尚不明确。采用盆栽试验,研究了冬种紫云英、油菜、黑麦草对土壤性状及硝化作用的影响,并通过特异性细菌抑制剂(卡那霉素和大观霉素)研究了氨氧化细菌(AOB)和氨氧化古菌(AOA)对硝化作用的相对贡献。结果表明,冬种三种绿肥均显著降低了早稻移栽前、分蘖期和拔节期的硝化潜势,同时增加了多数取样时期的铵态氮含量,降低了硝态氮含量,硝态氮含量与硝化潜势显著正相关。与冬季休闲相比,绿肥处理提高了大部分时期的AOA和AOB amoA基因丰度。同时,AOB在水稻主要生长期土壤硝化过程中均占主导地位,相对贡献约为61.02%~82.37%。不同绿肥处理在早稻分蘖期促进了AOB对硝化作用的相对贡献,在早稻移栽前和拔节期降低了AOA的相对贡献。综上,绿肥可降低稻田土壤中的硝态氮淋失风险,冬种绿肥在稻田土壤氮素管理中有重要意义。

    Abstract:

    [Objective] Utilization of green manure crops in winter is an effective practice to maintain high and stable yields in paddy fields in South China, and plays an important role in N management in the rice cropping system. Nitrification is a key process in N cycling and is highly related to N utilization of crops and to N leaching loss as well. Since nitrification process is a potential N loss pathway, it is worthwhile to study impacts of cultivation and incorporation of green manure crops on nitrification process and ammonia oxidizing microorganisms in paddy soil.[Method] A pot experiment having three crops a year, that is, green manure crop, early rice and later rice, was conducted in alkaline paddy soil and designed to have four treatments, i.e. winter fallow-double cropping rice (WF), milk vetch-double cropping rice (MV), ryegrass-double cropping rice (RG) and rape-double cropping rice (RP). Nitrification potential (NP) and recovered nitrification potential (RNP) of the soil in the pots were measured. Relative contributions of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) to RNP were explored using specific bacterial inhibitors (Kanamycin and Spectinomycin). Abundances of AOA and AOB were measured using the amoA gene-based real-time quantitative PCR method.[Result] Treatments MV and RG increased the N uptake of early rice and late rice, respectively. Plantation of winter green manure crops, no matter what, significantly lowered NP at the pre-transplanting, tillering and jointing stages of early rice. The NP at the jointing stage of early rice was the highest in Treatment WF, reaching up to 56.15 mg×kg-1×d-1. Compared to Treatment WF, the other three treatments were all higher in NH4+-N, and lower in NO3--N at most of the sampling stages. Soil NO3--N was significantly and positively related to NP. Compared to Treatment WF, all the green manure treatments were higher in copy numbers of AOA and AOB amoA genes at most of the sampling stages, especially the former, which was much higher than the latter. However, AOB was a dominating contributor to RNP at all the sampling stages, contributing relatively 61.02%-82.37%. The abundance of amoA genes had nothing to do with the contributions of AOA and AOB to nitrification. Utilization of green manure crops increased relative contribution of AOB to RNP (RNPAOB) at the tillering stage of early rice, but decreased that of AOA to RNP (RNPAOA) at the pre-transplanting and jointing stages of early rice. Soil properties were significantly related to nitrification process, especially soil pH, NH4+-N and NO3--N. Application of winter green manure crops decreased soil pH in alkaline soil, which may be one of the main causes of the practice inhibiting nitrification.[Conclusion] Application of winter green manure crops reduces soil NP, which is consistent with the variation of soil NO3--N, suggesting that the practice may mitigate the risk of NO3--N leaching loss. Therefore, it plays an important role in N management in paddy soil.

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高嵩涓,周国朋,曹卫东.冬种绿肥对水稻土硝化作用的影响[J].土壤学报,2022,59(1):263-273. DOI:10.11766/trxb202004050150 GAO Songjuan, ZHOU Guopeng, CAO Weidong. Impacts of Plantation of Winter Green Manure Crops on Soil Nitrification in Paddy Soil[J]. Acta Pedologica Sinica,2022,59(1):263-273.

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  • 收稿日期:2020-04-05
  • 最后修改日期:2020-07-08
  • 录用日期:2020-09-22
  • 在线发布日期: 2020-12-10
  • 出版日期: 2022-01-11