| 3种栽培草地N2O释放通量季节动态的研究 |
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| 引用本文： | 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. |
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| 作者姓名： | 李渊 王涛 周莹 杨倩 沈禹颖 |
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| 作者单位： | 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 |
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| 基金项目： | 教育部重大科技项目，甘肃省重大科技专项，教育部创新团队 |
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| 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。
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| 关 键 词： | 栽培草地 旱地 氧化亚氮 释放通量 |
| 收稿时间： | 2014-06-26 |
Research on N2O Emission Fluxes of 3 Cultivated Grasslands in Growing Seasons |
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| 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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| Authors: | LI Yuan WANG Tao ZHOU Ying YANG Qian SHEN Yu-ying |
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| Institution: | State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu Province 730020, China |
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| 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. |
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| Keywords: | Cultivated grassland Arid area Nitrous oxide Emission fluxes |
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