摘要
通过光量子传感器,获取了2个棉花品种不同种植密度冠层6个关键生育时期的光合有效辐射(PAR),分析了吸收光合有效辐射(APAR)和光合有效辐射截获量(FAPAR)与棉花冠层生长特征的关系。结果表明;棉花开花期和花铃期,为APAR与FAPAR高值期,盛铃期和盛铃末期下降,吐絮期为低值期;利用多元统计分析技术,分别建立了棉花APAR、FAPAR与棉花冠层叶面积指数、覆盖度、地上鲜生物量和地上净初级生产力的相关关系模型。采用APAR与覆盖度,FAPAR与叶面积指数相关性最高的模型方程,分别估算棉花覆盖度和叶面积指数,实测值与估测值之间呈极显著的线性相关关系,估算精度分别为99.1%和99.5%。
We cultivated two cotton cultivars in an experimental field, and recorded the photosythetically active radiation（PAR） of the cotton canopy using a linear quantum sensor at six key growth stages. The absorbed photosythetically active radiation（APAR） and fractional interception of absorbed photosythetically active radiation（FAPAR） were deduced from PAR data. The results showed that the highest APAR and FAPAR values were at the cotton flowering stage, the flowering to boll-forming stage, respectively. Their values decreased at the full boll stage and late boll stage, and reached a minimum at the boll opening stage. We used multivariate analyses for regression modeling between APAR/FAPAR, and leaf area index, ground cover, aboveground fresh biomass, and aboveground net primary production. The strongest relationship was between APAR and ground cover. Regression analyses showed that FAPAR and leaf area index were related via an exponential function. There were significant rela- tionships between tested ground cover and estimated ground cover, and between tested LAI and estimated LAI, respectively. These results show that cotton APAR and FAPAR data can be used for real-time, nondestructive, and quantitative estimates of cotton canopy growth status parameters. These techniques will be useful for monitoring applications.
出处
《棉花学报》
CSCD
北大核心
2012年第4期336-340,共5页
Cotton Science
基金
国家自然科学基金项目(30960185和30460060)
人力资源和社会保障部留学回国人员科技活动项目(2009XL003)
高层次创造性人才计划项目(RCZX200813)
