摘要
【目的】研究棉花各生育时期吸收光合有效辐射(APAR)和光合有效辐射截获量(FAPAR)的变化特征,建立地上部各组分鲜生物量与APAR、FAPAR的相关关系,为实时、无损、快速监测棉花的长势状况,提供理论依据。【方法】通过线性光量子传感器LI-250SA获取常规棉和杂交棉冠层5个生育时期的光合有效辐射(PAR),计算得到光合有效辐射参数APAR和FAPAR,同时获取棉花地上部各组分鲜生物量(茎、叶片、生殖器官),并进行相关回归分析。【结果】两品种5个生育时期冠层APAR和FAPAR在盛蕾期较低,开花结铃期达到最高值。基于棉花两品种APAR和FAPAR建立与地上部各组分鲜生物量的幂指数和指数函数模型,相关系数均达到了极显著的检验水平(α=1%,n=36),其中APAR与鲜叶生物量构建的幂指数函数模型(r=0.744 3**,RMSE=0.291 6),对地上部鲜叶生物量进行估算,实测值与估测值之间呈极显著的线性相关关系(r实测鲜叶量-估测鲜叶量=0.749 9**,n=36,α=1%),模型精度达80.7%。【结论】利用APAR可以定量反演棉花地上部鲜叶生物量,为光合有效辐射精确预测棉花长势信息提供科学依据。
【Objective】To study cotton canopy characteristics of absorbed photosynthetically active radiation( APAR) and fractional interception of absorbed photosynthetically active radiation( FAPAR) at different growth stages,establish estimation model between aboveground fresh biomass of cotton canopy different components and APAR,FAPAR and provide a theoretical foundation for real- time,nondestructively and rapid means of cotton growth status monitoring. 【Method】Conventional cotton and hybrid cotton were planted in an experimental field,their canopy photosynthetically active radiation( PAR) were recorded by a linear quantum sensor LI- 250 SA at five main growth stages,their photosynthetically active radiation parameters such as APAR and FAPAR were calculated from PAR,meanwhile corresponding aboveground fresh biomass from cotton canopy different components( stem,leaves and reproductive organ) were obtained,then regression analysis was conducted between fractional components of cotton canopy and APAR or FAPAR.【Result】APAR and FAPAR of two cotton cultivars canopy reached the lower values both at full bud stage,their maximum values both occurred at flowering and boll- forming stage,respectively. Power exponent function and exponential function models of aboveground fresh biomass of different components based on APAR and FAPAR of two cotton cultivars canopy were established,they were all significantly correlated at 1% level( α = 1%,n = 36). Moreover,utilizing the power exponent function model between APAR and fresh leaves biomass( r APAR-fresh leaves biomass = 0. 744 3**,RMSE = 0. 291 6) to estimate fresh leaves biomass,it had significant correlation at 1%level between measured fresh leaves biomass and estimated fresh leaves biomass( rMeasured fresh leaves biomass- Estima-ted fresh leaves biomass= 0. 749 9**,n = 36,α = 1%),precision of the regression was 80. 7%. 【Conclusion】Aboveground fresh leaves biomass of cotton canopy could be quantificationally estimated by using APAR,which offered a basis for photosyn
出处
《新疆农业科学》
CAS
CSCD
北大核心
2015年第11期1969-1974,共6页
Xinjiang Agricultural Sciences
基金
国家自然科学基金项目(31560354
30460060)
人力资源和劳动社会保障部留学回国人员科技活动项目(RSLX201303)~~
关键词
棉花
APAR
FAPAR
地上部各组分鲜生物量
相关模型
cotton
APAR
FAPAR
aboveground fresh biomass of different components
correlationship modeling
