草甸草原温室气体排放对氮添加量的非线性响应

doi:10.17521/cjpe.2023.0011

植物生态学报 ›› 2023, Vol. 47 ›› Issue (11): 1483-1492.DOI: 10.17521/cjpe.2023.0011

所属专题：全球变化与生态系统；生态系统碳水能量通量

草甸草原温室气体排放对氮添加量的非线性响应

葛萍¹^,², 李昂², 王银柳², 姜良超², 牛国祥², 哈斯木其尔², 王彦兵², 薛建国², 赵威¹^,^*(), 黄建辉²^,^*()

¹河南科技大学农学院, 河南洛阳 471023
²中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093

收稿日期:2023-01-12 接受日期:2023-05-12 出版日期:2023-11-20 发布日期:2023-12-22
通讯作者: *(Zhao W, zhaowei1@huast.edu.cn; Huang JH, jhhuang@ibcas.ac.cn)
基金资助:
国家自然科学基金(32071562)

Nonlinear response of greenhouse gases emission to nitrogen addition in a meadow steppe

GE Ping¹^,², LI Ang², WANG Yin-Liu², JIANG Liang-Chao², NIU Guo-Xiang², HASI Muqi’er², WANG Yan-Bing², XUE Jian-Guo², ZHAO Wei¹^,^*(), HUANG Jian-Hui²^,^*()

¹College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China
²State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China

Received:2023-01-12 Accepted:2023-05-12 Online:2023-11-20 Published:2023-12-22
Contact: *(Zhao W, zhaowei1@huast.edu.cn; Huang JH, jhhuang@ibcas.ac.cn)
Supported by:
National Natural Science Foundation of China(32071562)

摘要/Abstract

摘要：

为了研究氮沉降对内蒙古额尔古纳草甸草原主要温室气体(CO₂、CH₄和N₂O)排放通量的影响, 该研究通过添加NH₄NO₃模拟氮沉降, 并设置6个氮添加水平(0、2、5、10、20、50 g·m^-2·a^-1), 同时考虑到草地利用方式的影响, 设置刈割和不刈割2个处理水平。分别于2020年和2021年的生长季(5-9月), 采用静态箱-气相色谱法测定了3种温室气体的排放通量。主要结果有: 1)生长季内3种温室气体的排放通量对氮添加的响应呈明显的非线性, 但响应格局在3种温室气体之间存在明显的差异。2)当氮添加量达到5-10 g·m^-2·a^-1时, CO₂的通量达到峰值, 表现出显著的饱和性特征; CH₄的吸收在低氮添加(0-5 g·m^-2·a^-1)时受到促进, 且这种促进作用随着氮添加量的增加而增强, 但氮添加量达到5-10 g·m^-2·a^-1时, 对CH₄吸收的促进作用逐渐减弱, 且高氮添加(50 g·m^-2·a^-1)显著抑制CH₄的吸收; N₂O的排放通量对氮添加的响应总体也随氮添加量的增加而显著增加, 但响应模式与幅度存在年际差异。3)刈割仅在2021年对CH₄的吸收具有显著的促进作用。4)综合两年的结果, CO₂排放通量与降水量和硝态氮含量显著正相关, 与pH显著负相关。CH₄吸收通量与降水量和铵态氮含量显著正相关, 与pH显著负相关。N₂O排放通量与土壤温度和铵态氮含量显著正相关, 与硝态氮含量显著负相关。上述研究结果表明, 大气氮沉降增加对温室气体排放的影响具有普遍的非线性特征, 但不同温室气体的通量格局存在一定的差异。该研究结果对控制氮肥用量、选择合适的草地利用方式、评估草地生态系统变暖潜势具有重要意义。

关键词: 草甸草原, 氮添加, 刈割, 温室气体排放, 呼伦贝尔, 非线性响应, 硝态氮, 铵态氮

Abstract:

Aims How nitrogen (N) addition impacts the emission of greenhouse gases (GHGs) is now becoming a hot issue in the study of global change. We aim to delineate the effects of N addition on the emission of major greenhouse gases (CO₂, CH₄and N₂O).

Methods In order to achieve this goal, the flux of the three major GHGs was measured using static chamber gas chromatography during the growing seasons (May through September) of 2020 and 2021 in a meadow steppe of Hulun Buir in Nei Mongol. The experiment was conducted by applying NH₄NO₃ to simulate the atmospheric N deposition, which involved six N addition levels (i.e., 0, 2, 5, 10, 20, 50 g·m^-2·a^-1) and two grassland utilization levels (i.e., mown and unmown).

Important findings The results showed that the response of the three GHGs to N addition showed clear nonlinear patterns, but there was a remarkable difference in the patterns among the three GHGs. The emission of CO₂ was increased with increasing N addition but saturated at around 10 g·m^-2·a^-1. The uptake of CH₄ was promoted with increasing N addition when N addition was low (0-5 g·m^-2·a^-1), but this promotion effect was diminished with further increase in N addition (5-10 g·m^-2·a^-1), and the uptake of CH₄ was inhibited when N addition reached 50 g·m^-2·a^-1. The emission of N₂O increased significantly with the increase of N addition rates, but the response patterns and amplitude showed remarkable difference between the two years. With the data in the two years pooled, the CO₂ flux had a significant positive correlation with precipitation and nitrate nitrogen (NO- 3-N) content, and a significant negative correlation with pH; CH₄ absorption flux was significantly positively correlated with precipitation and ammonium nitrogen (NH+ 4-N) content, while negatively correlated with pH; N₂O flux was significantly positively correlated with soil temperature and NH+ 4-N content, while significantly negatively correlated with NO- 3-N content. Our findings demonstrated that the response of the three GHGs to increasing atmospheric N deposition was largely nonlinear, and the response patterns were remarkably different among the three GHGs. These findings may be of great importance for controlling N fertilizer use, selecting appropriate grassland use, and evaluating grassland ecosystem warming potential under increasing atmospheric N deposition.

Key words: meadow steppe, nitrogen addition, mowing, greenhouse gas emission, Hulun Buir, nonlinear response, nitrate nitrogen, ammonium nitrogen

葛萍, 李昂, 王银柳, 姜良超, 牛国祥, 哈斯木其尔, 王彦兵, 薛建国, 赵威, 黄建辉. 草甸草原温室气体排放对氮添加量的非线性响应. 植物生态学报, 2023, 47(11): 1483-1492. DOI: 10.17521/cjpe.2023.0011

GE Ping, LI Ang, WANG Yin-Liu, JIANG Liang-Chao, NIU Guo-Xiang, HASI Muqi’er, WANG Yan-Bing, XUE Jian-Guo, ZHAO Wei, HUANG Jian-Hui. Nonlinear response of greenhouse gases emission to nitrogen addition in a meadow steppe. Chinese Journal of Plant Ecology, 2023, 47(11): 1483-1492. DOI: 10.17521/cjpe.2023.0011

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2023.0011

https://www.plant-ecology.com/CN/Y2023/V47/I11/1483

图/表 8

图1 2020和2021年呼伦贝尔草甸草原实验样地的月降水量和平均气温。

Fig. 1 Monthly precipitation and mean air temperature of the experimental site across 2020 and 2021 in Hulun Buir meadow steppe.

图2 草甸草原CO2排放通量随氮添加后天数的动态变化(平均值±标准误)。A、B, 2020年。C、D, 2021年。N0、N2、N5、N10、N20、N50分别表示为0、2、5、10、20、50 g·m-2·a-1的氮添加。

Fig. 2 Dynamics of CO2 emission flux with days after nitrogen (N) addition in a meadow steppe (mean ± SE). A, B, Year 2020. C, D, Year 2021. N0, N2, N5, N10, N20, N50 represent N addition of 0, 2, 5, 10, 20, 50 g·m-2·a-1, respectively.

图3 草甸草原平均CO2排放通量随氮添加水平的变化(平均值±标准误)。A、B, 2020年。C、D, 2021年。**, p < 0.01。

Fig. 3 Variation of the mean CO2 emission flux with nitrogen (N) addition levels in a meadow steppe (mean ± SE). A, B, Year 2020. C, D, Year 2021. **, p < 0.01.

图4 草甸草原CH4吸收通量随氮添加后天数的动态变化(平均值±标准误)。A、B, 2020年。C、D, 2021年。N0、N2、N5、N10、N20、N50分别表示为0、2、5、10、20、50 g·m-2·a-1的氮添加。

Fig. 4 Dynamics of CH4 uptake flux with days after nitrogen (N) addition in a meadow steppe (mean ± SE). A, B, Year 2020. C, D, Year 2021. N0, N2, N5, N10, N20, N50 represent N addition of 0, 2, 5, 10, 20, 50 g·m-2·a-1, respectively.

图5 草甸草原平均CH4吸收通量随氮添加水平的变化(平均值±标准误)。A、B, 2020年。C、D, 2021年。*, p < 0.05。

Fig. 5 Variation of the mean CH4 uptake flux with nitrogen (N) addition levels in a meadow steppe (mean ± SE). A, B, Year 2020. C, D, Year 2021. *, p < 0.05.

图6 草甸草原N2O排放通量随氮添加后天数的动态变化(平均值±标准误)。A、B, 2020年。C、D, 2021年。N0、N2、N5、N10、N20、N50分别表示为0、2、5、10、20、50 g·m-2·a-1的氮添加。

Fig. 6 Dynamics of N2O emission flux with days after nitrogen (N) addition in a meadow steppe (mean ± SE). A, B, Year 2020. C, D, Year 2021. N0, N2, N5, N10, N20, N50 represent N addition of 0, 2, 5, 10, 20, 50 g·m-2·a-1, respectively.

图7 草甸草原平均N2O排放通量随氮添加水平的变化(平均值±标准误)。A、B, 2020年。C、D, 2021年。*, p < 0.05; **, p < 0.01。

Fig. 7 Variation of the mean N2O emission flux with nitrogen (N) addition levels in a meadow steppe (mean ± SE). A, B, Year 2020 C, D, Year 2021. *, p < 0.05; **, p < 0.01.

表1 草甸草原温室气体通量与影响因子的相关性

Table 1 Correlation between greenhouse gas (GHG) flux and environmental factors in a meadow steppe

温室气体 GHGs	土壤温度 Soil temperature	降水量 Precipitation	pH	铵态氮含量 NH⁺₄-N content	硝态氮含量 NO^-₃-N content
CO₂	-0.02	0.36^**	-0.41^**	0.04	0.43^**
CH₄	0.18^**	0.25^**	-0.23^**	0.37^**	0.07
N₂O	0.59^**	-0.10	-0.02	0.26^**	-0.23^**

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草甸草原温室气体排放对氮添加量的非线性响应

Nonlinear response of greenhouse gases emission to nitrogen addition in a meadow steppe

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