【目的】构建新疆典型荒漠植物光谱数据库系统,实现典型荒漠植物光谱数据高效管理和通用处理分析,增强光谱数据的实用性和荒漠区域生态恢复高光谱遥感生境监测数据的多源性。【方法】采用数据库技术、计算机技术和高光谱数据处理分析技术,基于C/S模式架构在VS2008平台下,基于SQL Server 2008关系型数据库,利用C#语言与IDL混合编程开发数据库系统。【结果】设计并完成了典型荒漠植物光谱数据库和系统功能开发,实现了光谱数据的入库存储、管理和光谱微分、光谱积分、光谱匹配、植物光谱特征参数提取分析等通用处理分析功能。【结论】为研究区生态恢复高光谱遥感定量监测提供有效的数据服务和技术支持。
[Objectivc] This study aimed to investigate the chilling tolerance of seedlings of different cotton genotypes and screen appropriate indicators for assess- ing chilling tolerance, to establish reliable mathematical evaluation model for chilling tolerance of cotton, thus providing theoretical basis for breeding and promoting new chilling-tolerant cotton germplasms and large-scale evaluation of chilling tolerance of cotton varieties. [Method] Fifteen cotton varieties （lines） were used as experimental materials. The photosynthetic gas exchange parameters, chlorophyll fluorescence ki- netic parameters, chlorophyll content, relative soluble sugar content, malonaldehyde content, relative proiine content, relative conductivity and other 12 physiological indi- cators of seedling leaves under low temperature treatment （5 ℃, 12 h） and recovery treatment （25 ℃. 24 h） were determined; based on the chilling tolerance coefficient （CTC） of various individual indicators, the comprehensive evaluation of chilling toler- ance was conducled by using principal component analysis, hierarchical cluster anal- ysis and stepwise regression analysis. [Result] The results showed that the 12 indi- vidual physiological indicators could be classified into 7 independent comprehensive components by principal component analysis; 15 cotton varieties （lines） were clus- tered into three categories by using membership function method and hierarchical cluster analysis; the mathematical model for evaluating chilling tolerance of cotton seedlings was established： D =0.275 -0.244Fo1 ＋0.206Fv/Fm1＋0.326g,%-0.056SS ＋ 0.225MDA＋O.O38REC （FF=0.995）, and the evaluation accuracy of the equation was higher than 94.25%,0. Six identification indicators closely related to chilling tolerance were screened, including Fo,, Fv/Fm1, Seedling leaves of cotton varieties （lines） gs2, SS, MDA, and REC. [Conclusion] with high chilling tolerance are less dam- aged under low temperature stress, and are able to maintain relatively high p
