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王颖,娄运生,石一凡,郑泽华,左慧婷.夜间增温对稻田甲烷排放的影响及其高光谱估算.生态学报,2018,(14).http://dx.doi.org/10.5846/stxb201707201304  
夜间增温对稻田甲烷排放的影响及其高光谱估算
Methane emission in response to nighttime warming and its hyper spectral estimation in a paddy filed
投稿时间:2017-07-20  修订日期:2018-02-07
DOI: 10.5846/stxb201707201304
关键词夜间增温  甲烷,排放通量  高光谱估算  水稻田
Key Wordsnighttime warming  methane  flux  hyper-spectral estimation  paddy field
基金项目国家自然科学基金(41375159);江苏省自然科学基金(BK20131430)
作者单位E-mail
王颖 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室 244407231@qq.com 
娄运生 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室 yunshlou@163.com 
石一凡 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室  
郑泽华 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室  
左慧婷 南京信息工程大学气象灾害预报预警与评估协同创新中心/江苏省农业气象重点实验室  
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摘要:
昼夜不对称增温是全球气候变化的主要特征之一。本文通过田间模拟试验,研究了被动式夜间增温下水稻田土壤甲烷(CH4)排放及水稻冠层高光谱特征,并基于高光谱估算了CH4排放通量。田间试验设夜间增温(NW)和对照处理(CK),夜间增温即在整个水稻生育期的夜间(19:00-6:00)用铝箔反射膜覆盖水稻冠层。结果表明,夜间增温显著促进水稻拔节期和抽穗期-灌浆期CH4排放。水稻冠层近红外光谱反射率表现为,在分蘖期和拔节期时,NW>CK;而在抽穗-灌浆期和成熟期时,CK>NW。水稻冠层光谱反射率、一阶导数光谱及光谱特征值均与CH4排放通量显著相关,其中以可见光与近红外波段反射率一阶导(R’620、R’793)为变量建立的双变量二次多项式模型和以“蓝边面积”(SDb)构成的二次多项式模型效果最佳。
Abstract:
Asymmetric diurnal warming is one of the main features of global climate change. A field experiment with rice was conducted to investigate the effect of passive nighttime warming on CH4 emission in a paddy field and rice canopy hyper-spectral characteristics. CH4 emission flux was estimated based on hyper-spectral data. The tested rice was hybrid rice cv. Y Liangyou 3399. The tested paddy soil was classified as a Typic Stagnic Anthrosol. The experiment was designed with two levels of warming, i.e. nighttime warming (NW) and control (CK). Nighttime warming was treated by covering rice canopy with an aluminum foil reflective film at night(19:00-6:00),and performed at the Station of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing, China. CH4 emission was measured by the closed chamber method at one-week interval during rice growing period. The results showed that, nighttime warming significantly increasedCH4 emission at rice jointing and heading-grain filling stages. Compared with CK, nighttime warming increased the reflectance of near-infrared spectrum on canopy at the tillering and jointing stage, but decreased it at heading-grain filling and maturity stages. Positive correlations were observed in the relations of CH4 emission with spectral reflectance, first derivation and characteristic value of spectrum. Moreover, the best estimations for CH4 emission were to build bivariate quadratic polynomial model by first derivation of visible light and near-infrared spectrum (R’620,R’793), and quadratic polynomial model by ‘area of Blue Edge’ (SDb).
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