水稻节水栽培是选用符合国家颁布的优质稻标准的优良品种的基础上,在水稻栽培全过程中综合运用节水技术,最大限度地节省灌溉用水,提高水的利用效率(Water Use Efficency,WUE),即提高单位耗水(蒸散量)的经济产量。彻底改变传统的淹水栽...水稻节水栽培是选用符合国家颁布的优质稻标准的优良品种的基础上,在水稻栽培全过程中综合运用节水技术,最大限度地节省灌溉用水,提高水的利用效率(Water Use Efficency,WUE),即提高单位耗水(蒸散量)的经济产量。彻底改变传统的淹水栽培方式,建立一种新型节水稻作体系,是现代稻作的系统工程,是按照水稻生育需水规律,在确保其正常生长前提下,实施科学节水技术,节制灌溉,充分发挥灌溉水的生产效率,达到"节水、优质、高产、高效、低耗"这一目标。展开更多
The molecular-rich atmospheres of M type stars complicate our understanding to their atmospheric properties.Recently,great progress has been made in atmospheric modeling of M-type stars,and we take advantage of the up...The molecular-rich atmospheres of M type stars complicate our understanding to their atmospheric properties.Recently,great progress has been made in atmospheric modeling of M-type stars,and we take advantage of the updated BT-Settl model grid to develop a pipeline LAS PM to measure atmospheric parameters(Teff,log g,[M/H]) of M-type stars from low-resolution spectra.The pipeline was applied to the sixth and seventh data release(DR6 & DR7) of Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST),which released atmospheric parameters for 610419 and 680 185 Mtype spectra,respectively.The key algorithm is to find the best-matching for templates in the synthetic spectral library for an observed spectrum,and then minimizing χ^(2) through a linear combination of five best-matching templates.The intrinsic precisions of the parameters were estimated by using the multiple epoch observations for the same stars,which are 118 K,0.20 dex,0.29 dex for Teff,log g,and [M/H]respectively.The Teff and log g are consistent with the spectral and luminosity classifications by LAMOST 1D pipeline,and the loci of giants and dwarfs both on spectral index and color-magnitude diagrams show the validity.The metallicities of LASPM are also checked with the selected members of four open clusters(NGC 2632,Melotte 22,ASCC16,and ASCC19),which are consistent without any bias.Comparing the results between LASPM and the APOGEE Stellar Parameter and Chemical Abundance Pipeline(ASPCAP),there is a scatter of 73 K,0.22 dex,0.21 dex for Teff,log g,and [M/H],respectively.展开更多
文摘水稻节水栽培是选用符合国家颁布的优质稻标准的优良品种的基础上,在水稻栽培全过程中综合运用节水技术,最大限度地节省灌溉用水,提高水的利用效率(Water Use Efficency,WUE),即提高单位耗水(蒸散量)的经济产量。彻底改变传统的淹水栽培方式,建立一种新型节水稻作体系,是现代稻作的系统工程,是按照水稻生育需水规律,在确保其正常生长前提下,实施科学节水技术,节制灌溉,充分发挥灌溉水的生产效率,达到"节水、优质、高产、高效、低耗"这一目标。
基金supported by is supported by the National Natural Science Foundation of China (Grant Nos.U1931209 and 12090044)the National Key R&D Program of China (Nos.2019YFA0405502 and 2019YFA0405102)。
文摘The molecular-rich atmospheres of M type stars complicate our understanding to their atmospheric properties.Recently,great progress has been made in atmospheric modeling of M-type stars,and we take advantage of the updated BT-Settl model grid to develop a pipeline LAS PM to measure atmospheric parameters(Teff,log g,[M/H]) of M-type stars from low-resolution spectra.The pipeline was applied to the sixth and seventh data release(DR6 & DR7) of Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST),which released atmospheric parameters for 610419 and 680 185 Mtype spectra,respectively.The key algorithm is to find the best-matching for templates in the synthetic spectral library for an observed spectrum,and then minimizing χ^(2) through a linear combination of five best-matching templates.The intrinsic precisions of the parameters were estimated by using the multiple epoch observations for the same stars,which are 118 K,0.20 dex,0.29 dex for Teff,log g,and [M/H]respectively.The Teff and log g are consistent with the spectral and luminosity classifications by LAMOST 1D pipeline,and the loci of giants and dwarfs both on spectral index and color-magnitude diagrams show the validity.The metallicities of LASPM are also checked with the selected members of four open clusters(NGC 2632,Melotte 22,ASCC16,and ASCC19),which are consistent without any bias.Comparing the results between LASPM and the APOGEE Stellar Parameter and Chemical Abundance Pipeline(ASPCAP),there is a scatter of 73 K,0.22 dex,0.21 dex for Teff,log g,and [M/H],respectively.
