湘中地区中稻碳通量的变化特征
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国家重点研发计划(2017YFD0301506)


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    摘要:

    采用涡度相关技术对湘中地区中稻大田生育期(2019年6—9月)的碳通量进行了连续观测,分析了稻田生态系统碳交换中的净碳交换量(NEE)、总初级生产力(GPP)和总呼吸(Reco)的变化特征。结果表明:中稻大田生育期内碳通量具有明显的日变化和季节变化特征,碳通量月平均日变化总体成“U”形单峰曲线变化,不同月份的差异体现在“U”形的高度上;中稻大田生育期内不同生育时期的固碳能力有所不同,孕穗期、齐穗期、灌浆中期、分蘖盛期、成熟期的固碳能力依次减弱;NEE、GPP和Reco的变化曲线分别呈现出“U”形、倒“U”形和偏锋特征;中稻大田生育期内的NEE总和、GPP、Reco分别为–173.93、587.62、413.68 g/m2。研究发现,湘中地区中稻大田生育期内表现出一定的碳汇功能,这也正是产量形成的物质基础和产量潜力挖掘的研究方向。

    Abstract:

    In this study, we continuously observed the carbon flux during the rice growth period(June-September, 2019) in central Hunan using the eddy covariance technology, and analyzed change characteristics of the carbon exchange, including net carbon exchange amount(NEE), total primary productivity(GPP) and total breath(Reco). The results showed that the carbon flux during the growth period has obvious characteristics of diurnal and seasonal changes: the monthly average daily change of carbon flux was generally a “U”-shaped single-peak curve change, and the variation among the studied different months is reflected in the height of the "U"-shaped curve. In the medium rice field, the carbon sequestration capacity followed a weakening trend over the five stages, booting stage, full heading stage, middle filling stage, tillering stage,and mature stage. The change curves of NEE, GPP and Reco showed the features in “U”, inverted “U” and “bias” shapes respectively. The total NEE was, –173.93 g/m2, GPP 587.62 g/m2, and Reco 413.68 g/m2. The study found that the middle rice field in the central Hunan region exhibited a relatively strong carbon sink function, which was the material basis for yield formation and yield potential mining and probably presented the research future.

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文双雅,高倩文,卢俊玮,高志强.湘中地区中稻碳通量的变化特征[J].湖南农业大学学报:自然科学版,2021,47(6):.

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  • 在线发布日期: 2021-12-28
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