最新刊期
卷 ， 期 S1 ， 1992
- 摘要：This paper analysed and discussed the application possibility of laser fluorescence technology on remote sensing of terrestrial features from the aspects of fluorescence spectra of vegetations and soils, as well as from signal to noise ratio of the system etc.
- 161
- |
- 133
- |
- 1
发布时间：2021-06-10 - 摘要：The paper described methods and technology using laser fluorescencing lidar system to dectect fluorescence spectra of oil-film types, vegetations, rocks, minerals, soils and other terrain features. The installation is composed of a N2 laser source, an optical spectrum analyser （OSA） , Cossegrain telescope receiving system. The installation can be applied to measure fluorescence spectra of various substances in laboratories or in fields at the distances of 25 -60 meters, the system is calibrated with standard lamp spectrum.
- 160
- |
- 184
- |
- 2
发布时间：2021-06-10 - 摘要：The paper described the characteristics of laser induced fluorescence spectra （LIFS） of various soils in China. The results showed: 1) the peak in the visible wave band is at about the wavelength of 450 nm, and its relative intensity has close correlation with the contents of organic matter, clay or water as well as the chemical composition of soils, 2) enviromemtal condition of measurement affects directly the relative fluorescence intensity of soil, but it does not change its features of LIFS, 3) vegetation cover degree influnces LIFS significantly, It indicated the possibility that applying laser induced fluorescence technology of remote sensing to deteect soil types and some properties of soil. The red wave band is the optimum band to differentiate vegetations and soils.
- 183
- |
- 174
- |
- 2
发布时间：2021-06-10 - 摘要：This paper described systematically some basic problems of vegetation remote sensing using technology of laser induced fluorescence, its contents indued: principles, plantphysiological bases of fluorescence detecting, charactristic significance of plant fluorescence spectra, as well as application prospects of remote sensing methods using laser induced fluorescence etc.
- 143
- |
- 376
- |
- 15
发布时间：2021-06-10 - 摘要：Laser induced fluorescence spectra of various plants can be obstained by illuminating with 337 nm N2 laser.Differences among peak wavelengthes and peak intensities can be used to distinguish woody broadleaf trees and coniferous trees, as well as herbaceous dicotyledon and monocotyledon. Fluorescence intensity ratios of 685 nm/740 nm and 440 nm/550 nm can be used as two parameters to distinguish plants. Suitable period and season should be selected for detecting plants when using the technology of laser induced fluorescence, the optimum detecting period of monocotyledon in joining stage, dicotyledon branching stage, woody plants between late spring and early summer. The paper also discribed the identification and classfication of plants, as well as the significance and application propects to monitor growth vigors of plants using the technology of laser induced fluorescence.
- 198
- |
- 225
- |
- 3
发布时间：2021-06-10 - 摘要：The paper discussed from photosynthesis view the chacteristics in fluorescence spectra of plant leaves at various forms and various conditions, as well as influences on fluorescence spectra by those conditions. The contents included. 1. characteristics in fluorescence spectra of plants at in vitro conditions and intravital conditions; 2. characteristics in fluorescence spectra of the front and the back of leaves; 3. influence on fluorescence spectra by various plant organs; 4. influence on fluorescence spectra by layed time of plant leaves; 5. influence on fluorescence spectra by various treatments on leaves, and so on. The purpose of the paper is to provide basic data for the application of the laser fluorescence technology on plant remote sensing.
- 148
- |
- 213
- |
- 6
发布时间：2021-06-10 - 摘要：Corn was planted in field under different treatments of fertilizer application, and indices of corn growth shape, fluorescence spectra, laser induced fluorescence spectra of live leaves as well as fluorescence spectra of the extracting solution of leaves were measured in the different growth stages. The results showed: 1) different conditions of fertilizer application not only are expressed in corn growth vigors, but also affected the efficiency of photosynthesis and the content of chloro-phyl as well as the fluorescence spectra of corn, 2) peak intensities of 440nm, 550nm and 685 nm can be used to monitor the nutrient supplying condition of corn, and it will be better to use ratios of those peak intensities. The study provided a new approach and reliable basis for monitoring the growth shape and estimating the yield of corn using laser induced fluorescence technology of remote sensing. The optimum monitoring period is jointing stage of corn due to the requirment of fertilizer, farming season, disparity of fluorescence spectra as well as the possibility of remote sensing.
- 172
- |
- 211
- |
- 9
发布时间：2021-06-10 - 摘要：Research on fluorescence spectral characteristics of rice under various conditions of nutrient application at several growth stages showed- nitrogen deficiency cause the peak intensities in the bule-green waveband decrease at effective tillering stage and increase from invalid tillering stage, it also cause the peak intensities in the red waveband and the ratios between peak intensities （such as 440 nm/550 nm） decrease during the whole growth stages. It is possible to monitor the conditions of nutrientsupply through charact ristic changes in fluorescence spectra of rice leaves, the optimum monitoring waveband is between 400 nm and 800 nm and the optimum monitoring period is between flourishing tillering stage and booting stage.
- 146
- |
- 167
- |
- 7
发布时间：2021-06-10 - 摘要：The paper discussed fluorescence spectral characteristics and their changes of some plants at normal, stressed and aged conditions. The results showed changes in intensities of the two chorophyl peaks have intrinsic relations with stress contents, and it can be used to forecast and study growth vigors and physiologic condi-ions of plants.
- 114
- |
- 137
- |
- 6
发布时间：2021-06-10 - 摘要：Laser induced fluorescence spectra of various samples, including rocks, minerals, soils, plants, water, and man-made building materials were measured using remote sensing system of laser fluorescence designed and assembled by China itself. The study showed the locations, intensities, and their combined indices of fluorescence peaks from terrestrial features can be used not only to distinguish various terrestrial features above-mentioned, but also to distinguish their sub-unites. The study, additionally, showed remote sensing system of laser fluorescence has considerable extensive prospect of application, and can be expected, at some aspects, to exceed the currently often used passive remote sensing based on reflectance spectra.
- 165
- |
- 184
- |
- 3
发布时间：2021-06-10
- Postal code：100190
- Tel：010-58887052 Email：nrsb@aircas.ac.cn
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备20021838号-9
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0