3种栽培草地N2O释放通量季节动态的研究

doi:10.11733/j.issn.1007-0435.2015.04.006

草地学报 ›› 2015, Vol. 23 ›› Issue (4): 703-709.DOI: 10.11733/j.issn.1007-0435.2015.04.006

3种栽培草地N₂O释放通量季节动态的研究

李渊, 王涛, 周莹, 杨倩, 沈禹颖

兰州大学草地农业科技学院草地农业生态系统国家重点实验室, 甘肃兰州 730020

收稿日期:2014-06-26 修回日期:2014-08-28 出版日期:2015-08-15 发布日期:2015-08-26
通讯作者: 沈禹颖
作者简介:李渊(1990-),男,甘肃酒泉人,硕士研究生,研究方向为草类作物与环境,E-mail:liyuan13@lzu.edu.cn
基金资助:
教育部重大科技项目(313028);甘肃省重大科技专项(1203FKDA035);教育部创新团队(IRT13019)资助

Research on N₂O Emission Fluxes of 3 Cultivated Grasslands in Growing Seasons

LI Yuan, WANG Tao, ZHOU Ying, YANG Qian, SHEN Yu-ying

State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu Province 730020, China

Received:2014-06-26 Revised:2014-08-28 Online:2015-08-15 Published:2015-08-26

摘要/Abstract

摘要：

为探究栽培草地生长季N₂O释放规律与其土壤水分、温度及土壤硝态氮、铵态氮含量的关系,在黄土高原旱塬区,采用静态箱-气相色谱法,研究早熟禾(Poa pratensis)、紫花苜蓿(Medicago sativa)和红豆草(Onobrychis viciaefolia)草地生长季N₂O释放通量季节动态。结果表明:3种栽培草地生长季N₂O释放通量差异显著(P <0.05)。早熟禾草地N₂O释放通量最高,红豆草草地次之,紫花苜蓿草地最小。通量变化范围分别为-0.3185~0.4943,-0.4962~0.4755,-0.3167~0.4620 mg·m^-2·h^-1。生长季内早熟禾草地N₂O累积释放通量显著高于紫花苜蓿和红豆草草地。3种栽培草地N₂O释放通量在花期出现峰值,在再生期出现吸收现象。早熟禾草地N₂O释放通量主要受土壤水分影响。2种豆科栽培草地N₂O释放通量主要与土壤硝态氮、铵态氮含量相关联。

关键词: 栽培草地, 旱地, 氧化亚氮, 释放通量

Abstract:

In order to determine the relationships between the N₂O emission fluxes of cultivated grassland in growing season and soil moisture, temperature, nitrate nitrogen content or ammonium nitrogen content, the N₂O emission fluxes of Kentucky bluegrass (Poa pratensis),lucerne (Medicago sativa) and sainfoin (Onobrychis viciaefolia) cultivated grasslands were observed during growing seasons in the Loess Plateau using a static chamber-HPLC method. The results showed that N₂O emission fluxes had significant difference in among 3 cultivated grasslands(P <0.05),Kentucky bluegrass grassland had the highest N₂O emission fluxes. The N₂O emission fluxes of Kentucky bluegrass, sainfoin and lucerne grassland were -0.3185~0.4943, -0.4962~0.4755, -0.3167~0.4620 mg·m^-2·h^-1, respectively. The N₂O accumulated emission fluxes of Kentucky bluegrass grasslands was obviously higher than those of lucerne and sainfoin. The N₂O emission fluxes of 3 cultivated grasslands reached the peak during florescence, while N₂O absorption was observed during regenerative phase. The N₂O emission fluxes of Kentucky bluegrass was mainly affected by soil moisture, and the N₂O emission fluxes of two legume cultivated grasslands were related with the contents of nitrate-N and ammonium-N.

Key words: Cultivated grassland, Arid area, Nitrous oxide, Emission fluxes

中图分类号:

X502

李渊, 王涛, 周莹, 杨倩, 沈禹颖. 3种栽培草地N₂O释放通量季节动态的研究[J]. 草地学报, 2015, 23(4): 703-709.

LI Yuan, WANG Tao, ZHOU Ying, YANG Qian, SHEN Yu-ying. Research on N₂O Emission Fluxes of 3 Cultivated Grasslands in Growing Seasons[J]. Acta Agrestia Sinica, 2015, 23(4): 703-709.

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https://manu40.magtech.com.cn/Jweb_cdxb/CN/Y2015/V23/I4/703

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3种栽培草地N₂O释放通量季节动态的研究

Research on N₂O Emission Fluxes of 3 Cultivated Grasslands in Growing Seasons

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