生态环境学报 ›› 2021, Vol. 30 ›› Issue (8): 1672-1682.DOI: 10.16258/j.cnki.1674-5906.2021.08.014

• 研究论文 • 上一篇    下一篇

基于DNDC模型不同降水年型下氮肥管理对马铃薯田N2O减排及增产潜力影响研究

张开1(), 王立为1,2,*(), 高西宁1,2, 贺明慧3   

  1. 1.沈阳农业大学农学院,辽宁 沈阳 110866
    2.辽宁省农业气象灾害重点实验室,辽宁 沈阳 110166
    3.沈阳市浑南区气象局,辽宁 沈阳 110186
  • 收稿日期:2021-04-25 出版日期:2021-08-18 发布日期:2021-11-03
  • 通讯作者: * 王立为(1986年生),男,讲师,博士,从事农业温室气体排放研究。E-mail: wlw@syau.edu.cn
  • 作者简介:张开(1997年生),女,硕士研究生,从事农业温室气体排放研究。E-mail: 821389356@qq.com
  • 基金资助:
    国家自然科学基金项目(32001409);国家重点研发计划项目(2019YFD1002204)

Effects of Nitrogen Management on the Potential of N2O Emission Reduction and Yield Increase in Potato Field under Different Precipitation Patterns Based on DNDC Model

ZHANG Kai1(), WANG Liwei1,2,*(), GAO Xining1,2, HE Minghui3   

  1. 1. College of Agronomy, Shenyang Agricultural University, Shenyang 110866, China
    2. Key Laboratory of Agrometeorological Disasters, Liaoning Shenyang 110166, China
    3. Shenyang Hunnan District Meteorological Service, Shenyang 110186, China
  • Received:2021-04-25 Online:2021-08-18 Published:2021-11-03

摘要:

农田N2O排放和产量的形成与施肥和水分的关系密切。为了探究不同降水年型下马铃薯(Solanum tuberosum)田不同施肥方式处理下土壤N2O减排增产潜力,进而提出基于减排和稳产增产的优化施肥方式,利用沈阳市1990—2019年共30年降水数据进行降水年型划分,以马铃薯田为研究对象,设置4种施氮梯度,分别为不施氮肥(0 kg∙hm-2)、低氮(60 kg∙hm-2)、中氮(120 kg∙hm-2)、高氮(180 kg∙hm-2)4种施氮水平,采用静态箱—气相色谱法对土壤N2O气体排放进行田间原位观测,进而运用DeNitrification-DeComposition(DNDC)模型探究在不同降水年型下马铃薯田增产减排的潜力。结果表明,(1)DNDC模型可以较为准确模拟马铃薯田N2O排放通量以及产量情况,模型效率指数分别在0.45—0.88和0.85—0.91之间。(2)运用DNDC模型模拟研究不同降水年型下马铃薯田增产减排的最优施肥量,结果发现随施肥量增加马铃薯产量均呈现出先增加后减少的变化趋势,而N2O排放通量呈现出一直增加的变化趋势。在增产减排的前提下得出干旱年的优化施肥量为45—60 kg∙hm-2,平水年为75—90 kg∙hm-2,湿润年为105—120 kg∙hm-2。(3)在各年型优化施肥量的前提下,提出了适宜的施肥深度以及施肥比例。在干旱年和平水年,随施肥深度增加产量先增加后减少,N2O排放通量却一直增加,当施肥深度为10—15 cm、基追比例为50%+50%时,模型模拟达到最优产量;而在湿润年,随施肥深度增加产量和N2O排放均增加,当施肥深度为20 cm、基追比例为60%+40%时模型模拟达到最优产量。

关键词: 降水年型, 马铃薯, DNDC模型, N2O排放, 产量, 氮肥管理

Abstract:

The N2O emission and yield of farmland is closely related to fertilization and water. In order to explore the potential of soil N2O emission reduction and yield increase under different fertilization methods in potato ( Solanum tuberosum ) field under different precipitation patterns, and then put forward the optimal fertilization method based on emission reduction, stable and high yields, this paper used the precipitation data of 30 years from 1990 to 2019 in Shenyang to classify the precipitation patterns, took potato field as the research object, and set four nitrogen gradients, including no nitrogen (0 kg∙hm-2), low nitrogen (60 kg∙hm-2), medium nitrogen (120 kg∙hm-2) and high nitrogen (180 kg∙hm-2). In-situ observation of soil N2O emission was carried out by static box gas chromatography, and then the DeNitrification-DeComposition (DNDC) model was used to explore the potential of yield increase and emission reduction in potato field under different precipitation patterns. The results showed that: (1) DNDC model could accurately simulate the N2O emission flux and yield in potato field, and the model efficiency indices were 0.45-0.88 and 0.85-0.91, respectively. (2) DNDC model was used to simulate the optimal fertilization amount for yield increase and emission reduction in potato field under different precipitation patterns. The results showed that potato yield increased first and then decreased with the increase of fertilization amount, while N2O emission flux showed a constant increasing trend. The optimal fertilization amount was 45-60 kg∙hm-2 in dry years, 75-90 kg∙hm-2 in normal years and 105-120 kg∙hm-2 in wet years under the premise of increasing yield and reducing emission. (3) On the premise of optimizing the fertilization amount of each precipitation pattern, the appropriate fertilization depth and fertilization proportion were proposed. The yield first increased and then decreased with the increase of fertilization depth, but the N2O emission flux was always increasing. And the model simulation reached the optimal yield when the fertilization depth was 10-15 cm and the ratio of base to topdressing was 50%+50% in dry and normal years. Both the yield and N2O emission increased with the increase of fertilization depth. And the model simulation reached the optimal yield when the fertilization depth was 20 cm and the ratio of base to topdressing was 60%+40% in wet years.

Key words: annual pattern of precipitation, potato, DNDC model, N2O emission, yield, nitrogen management

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