Seasonal variation of microelement contents in leaves of Cyclocarea paliurus among the provenances

Cyclocarya paliurus as a multiple function plant can accumulate biologically important microelement elements.To reveal the variation of selected microelement concentrations in leaves of C.paliurus provenances during the growing season,12 C.paliurus provenances in the field trial were sampled five times at approximately 1-month intervals.The method of inductively coupled plasma optical emission spectrometer（ICP-OES） was employed to determinate average concentrations of Fe,Mn,Zn,Cu and Se in leaves of 12 C.paliurus provenances.The results show that on average,the concentrations of five microelement in the leaves follows an order of Fe Mn Zn Cu Se.Variance analysis shows that there are significant differences in Fe,Mn and Zn concentrations among the twelve provenances（p0.05）,while there is no significant difference between Cu and Se concentrations.A significant difference was also observed in the concentrations of five microelements at the different sampling times（p0.001）,but the mean concentrations for each microelement showed different temporal dynamic patterns.Meanwhile,a significant correlation between concentrations of Se and other measured microelements was detected in the leaves of C.paliurus,except for Mn.Obtained results not only demonstrated that leaves of C.paliurus exhibited higher levels of microelements（Fe,Mn,Cu,Zn and Se）,but also provided a basis for breeding strategies of superior provenances with rich content of microelements,and choosing optimum harvesting time for food industry in future.

Portable Instrument for Normalized Difference Vegetation Index

By using four specially designed narrow bandpass filters and photodetectors in the instrument, the incident and reflected radiances of sun light on the vegetation are optically sensed, at the red and near infrared bands, then the normalized difference vegetation index(NDVI) is processed by a microprocessor. Compared with conventional spectrometer measuring method of NDVI, the instrument is easy to be used, compact, light and low-cost.

An integrated single-shot spectrometer with large bandwidth-resolution ratio and wide operation temperature range

There has been a rapidly growing demand for low-cost,integrated single-shot spectrometers to be embedded in portable intelligent devices.Even though significant progress has been made in this area,two major problems are still remaining,namely the high temperature sensitivity and poor bandwidth-resolution ratio(BRR)that can’t meet the requirement of most applications.In this work,we present an integrated single-shot spectrometer relying on a silicon photonic circuit that has a footprint less than 3mm2,but could achieve broad operation bandwidth about 100 nm and high resolution up to 0.1 nm(with a BRR~1000).Moreover,for the first time,we demonstrate an integrated spectrometer that could operate within a wide temperature range(between 10 and 70 degrees Celsius)without additional power consumption for temperature management.