Abstract: [Objective] This project aims to analyze the correlation between vegetation indices and fraction interception of absorbed photosynthetically active radiation (FAPAR),leaf net photosynthetic rate (Pn) of cotton in different water treatments,so that the vegetation indices will be used to retrieve FAPAR and Pn in order to realize the non-contact,non-destructive,rapid,real-time,large-area monitoring of cotton growth.[Method] Canopy hyperspectral reflectance data,photosynthetically active radiation(PAR) and leaf net photosynthetic rate of cotton Xinluzao No.33 with different irrigation treatments were recorded in field experiments by the ASD Fieldspec Pro FR 2500 spectroradiometer,LI-190SA linear quantum sensor and LI-6400 portable photosynthesis system at cotton key growth stages.[Result] The results showed that both of cotton FAPAR and Pn reached the maximum values at flowering and boll-forming stages and the minimum values at the boll opening period.Their models were all highly significant correlated at 1; level by the renormalized vegetation indices (RDVI),difference vegetation indices (DVI),enhanced vegetation indices (EVI) and photochemical reflectance indices (PRI) and FAPAR,Pn,respectively.The highly correlated ones were EVI and PRI with FAPAR,Pn (rEvI-FAPAR =0.686,3,RMSE =0.04,r PRI-Pn =0.644,7,RMSE =3.39),respectively.The FAPAR and PN were estimated by using the model equation with the highest correlation function,and the measured value and the estimated value of the model were extremely significant (rmeasured-FAPAR-estimated-FAPAR =0.805,4**,rmessurd Pn-estimated Pn =0.760,9**).[Conclusion] In conclusion,hyperspectral vegetation indices can be used to extract information of photosynthetic physiological parameters of cotton without causing any damage.

摘要： [目的]分析不同水分处理下棉花冠层植被指数与吸收光合有效辐射截获量(FAPAR)和叶片净光合速率(Pn)之间的相关性,并通过植被指数反演FAPAR和Pn,以实现非接触、非破坏、快速、实时、大面积监测棉花的生长状况.[方法]用美国ASD Fieldspec Pro FR 2500高光谱辐射仪、LI-190SA线性光量子传感器和LI-6400便携式光合测试系统,分别测定棉花新陆早33号不同水分处理关键生育时期的冠层高光谱数据、光合有效辐射(PAR)和叶片净光合速率.[结果]不同水分处理的棉花新陆早33号冠层FAPAR与Pn均在开花结铃期达到最大值,在吐絮期达到较低值.建立重归一化植被指数(RDVI)、差值植被指数(DVI)、增强型植被指数(EVI)、光化学反射植被指数(PRI)与FAPAR、Pn的函数模型都达到极显著性相关.其中EVI与FA-PAR,PRI和Pn的相关性最高(rEvI-FAPAR=0.686 3*,RMSE=0.04,rPRI-Pn=0.644 7**,RMSE=3.39,n=20),利用它们相关性最高的函数模型方程分别估算FAPAR和Pn,实测值和估测值都达到极显著(r实测FAFAR-估测FFAPAR =0.805 4*,r实测-估测Pn=0.760 9*,n =20).[结论]可以用高光谱植被指数无损的提取棉花光合生理参数信息.