This study aimed to determine the effects of spectral light characteristics on the visual response of the western flower thrips,the strengthening mechanism of thrips response behavior regulated by light,and thrips res...This study aimed to determine the effects of spectral light characteristics on the visual response of the western flower thrips,the strengthening mechanism of thrips response behavior regulated by light,and thrips response characteristics to contrast light.Light with combined and single wavelength were tested by using a self-made behavior response device for thrips.Light sources for trapping thrips were made to verify the trapping effect on thrips in a greenhouse,and the reasons for changes in thrips behavior were analyzed to characterize the mechanism of their phototactic response.The results showed that the light mode(single,contrast,combined light)affected the thrips visual response and approach response,whereas in contrast light,the effects were optimal.Combination light inhibited the thrips visual response,and when the illumination increased,the thrips visual response to single and combination light intensified,and the thrips approach sensitivity to green light increased in contrast and combination light.However,the light mode did not affect the thrips visual response and sensitivity to spectral light characteristics.The degree of thrips visual response to yellow light was stronger than that to green light,while the degree of thrips visual response to green light was stronger than that to yellow light,indicating that the photo-induced mechanism of the thrips visual response differed from that of the thrips approach response.Moreover,in the greenhouse,the trapping effect of different light sources on thrips was positively correlated with temperature.The trapping effect of green light was optimal,followed by a yellow light source,while the difference of light intensity(illumination,illumination energy)and its photo-thermal intensity between yellow and green light was the reason for the differences in the degree of visual trends and the trapping effects of thrips.However,the sensitivity of thrips responding to different light depended on the difference in the heterogeneous stimulation intensity of different spectral light.Thus,light brightness and photo-thermal effects were the causes of thrips visual responses,while bio-photoelectric reaction effects caused thrips to produce a visual response and affected the degree of the thrips visual response.The results reveal the underlying causes of pest control by light,and provide a theoretical basis for the research and development of pest induction equipment and light arrangements.展开更多
In order to improve the utilization efficiency of heavy metal pollution of farmland,the revitalization of Hunan rice brand,this research worked on 20142016 oriented social extensive collection of 285 varieties of rice...In order to improve the utilization efficiency of heavy metal pollution of farmland,the revitalization of Hunan rice brand,this research worked on 20142016 oriented social extensive collection of 285 varieties of rice,including 98 early rice varieties and 187 late rice varieties.Screening and veri fication of rice varieties with low Cadmium accumulation were studied in Changsha-Zhuzhou-Xiangtan of Hunan Province,and in other typical cadmium polluted area in Hunan Province.12 early rice varieties and 13 late rice varieties were selected as low Cadmium accumulation varieties.Field test showed that,through the screening of varieties(V),irrigation(I)and acidity adjustment(P),the content of cadmium in early rice is 0.064~0.233 mg/kg,and 0.143~0.246 mg/kg in late rice,basically to ensure the content of cadmium in rice to reach the national standard,and to ensure good food security.展开更多
The HySpex hyperspectral data used in this study have a wide spectral response range,narrow bandwidth,and high spatial resolution,and they can be effectively applied to the extraction of mineral alteration information...The HySpex hyperspectral data used in this study have a wide spectral response range,narrow bandwidth,and high spatial resolution,and they can be effectively applied to the extraction of mineral alteration information.We explore how to extract effective information from remote sensing images through remote sensing image classification technology and explore its utilization in geological science.This study aims to verify the reliability and accuracy of alteration information extracted by using a super-low altitude detection platform equipped with powered delta wings mounted with HySpex hyperspectral sensors in the Yudai area of the Kalatage district.Field data were collected and analyzed using Analytical Spectral Devices(ASD),and the results were compared with those obtained from the United States Geological Survey(USGS)spectral library.The analysis of the geological background and HySpex hyperspectral data was enhanced by Minimum Noise Fraction(MNF)transformation coupled with the Pixel Purity Index(PPI)to extract endmembers of altered minerals,including chlorite and jarosite,from different spectra(SWIR and VNIR)and spectral wavelengths.Additionally,two classification methods,the Spectral Angle Mapper(SAM)and Support Vector Machine(SVM),were applied to the data for effective mineral mapping.The best-performing method,i.e.,SVM,was validated using ground-truth information obtained during field observations.The results from the classification methods revealed accuracies of 59.57%for SAM and 69.25%for SVM.The HySpex hyperspectral data obtained using a super-low altitude detection platform proved highly effective for detecting altered rock information.Thus,this approach has great potential for the rapid identification of geological and mineralogical features,especially in complex terrains.展开更多
基金The authors acknowledge that this work was financial supported by the Scientific and technological project in Henan Province(Grant No.212102110139)the China Agricultural Research System(Grant No.CARS-03).
文摘This study aimed to determine the effects of spectral light characteristics on the visual response of the western flower thrips,the strengthening mechanism of thrips response behavior regulated by light,and thrips response characteristics to contrast light.Light with combined and single wavelength were tested by using a self-made behavior response device for thrips.Light sources for trapping thrips were made to verify the trapping effect on thrips in a greenhouse,and the reasons for changes in thrips behavior were analyzed to characterize the mechanism of their phototactic response.The results showed that the light mode(single,contrast,combined light)affected the thrips visual response and approach response,whereas in contrast light,the effects were optimal.Combination light inhibited the thrips visual response,and when the illumination increased,the thrips visual response to single and combination light intensified,and the thrips approach sensitivity to green light increased in contrast and combination light.However,the light mode did not affect the thrips visual response and sensitivity to spectral light characteristics.The degree of thrips visual response to yellow light was stronger than that to green light,while the degree of thrips visual response to green light was stronger than that to yellow light,indicating that the photo-induced mechanism of the thrips visual response differed from that of the thrips approach response.Moreover,in the greenhouse,the trapping effect of different light sources on thrips was positively correlated with temperature.The trapping effect of green light was optimal,followed by a yellow light source,while the difference of light intensity(illumination,illumination energy)and its photo-thermal intensity between yellow and green light was the reason for the differences in the degree of visual trends and the trapping effects of thrips.However,the sensitivity of thrips responding to different light depended on the difference in the heterogeneous stimulation intensity of different spectral light.Thus,light brightness and photo-thermal effects were the causes of thrips visual responses,while bio-photoelectric reaction effects caused thrips to produce a visual response and affected the degree of the thrips visual response.The results reveal the underlying causes of pest control by light,and provide a theoretical basis for the research and development of pest induction equipment and light arrangements.
基金Supported by Pilot Project of Remediation of Heavy Metal Polluted Farmland and Planting Adjustment for Crops Structure in Hunan~~
文摘In order to improve the utilization efficiency of heavy metal pollution of farmland,the revitalization of Hunan rice brand,this research worked on 20142016 oriented social extensive collection of 285 varieties of rice,including 98 early rice varieties and 187 late rice varieties.Screening and veri fication of rice varieties with low Cadmium accumulation were studied in Changsha-Zhuzhou-Xiangtan of Hunan Province,and in other typical cadmium polluted area in Hunan Province.12 early rice varieties and 13 late rice varieties were selected as low Cadmium accumulation varieties.Field test showed that,through the screening of varieties(V),irrigation(I)and acidity adjustment(P),the content of cadmium in early rice is 0.064~0.233 mg/kg,and 0.143~0.246 mg/kg in late rice,basically to ensure the content of cadmium in rice to reach the national standard,and to ensure good food security.
基金supported by National Key R&D Program of China(GrantNo.2018YFC0604001-3)B&R Team of Chinese Academy of Sciences(GrantNo 2017-XBZGBR-002)+2 种基金Key Project of Natural Science Foundation of China-Xinjiang Joint Fund(No U1803241)National Nature Science Foundation(GrantNo U1803117 and U1503291)UCAS Scholarship for International Students,Xinjiang Institute of Ecology and Geography,CAS.
文摘The HySpex hyperspectral data used in this study have a wide spectral response range,narrow bandwidth,and high spatial resolution,and they can be effectively applied to the extraction of mineral alteration information.We explore how to extract effective information from remote sensing images through remote sensing image classification technology and explore its utilization in geological science.This study aims to verify the reliability and accuracy of alteration information extracted by using a super-low altitude detection platform equipped with powered delta wings mounted with HySpex hyperspectral sensors in the Yudai area of the Kalatage district.Field data were collected and analyzed using Analytical Spectral Devices(ASD),and the results were compared with those obtained from the United States Geological Survey(USGS)spectral library.The analysis of the geological background and HySpex hyperspectral data was enhanced by Minimum Noise Fraction(MNF)transformation coupled with the Pixel Purity Index(PPI)to extract endmembers of altered minerals,including chlorite and jarosite,from different spectra(SWIR and VNIR)and spectral wavelengths.Additionally,two classification methods,the Spectral Angle Mapper(SAM)and Support Vector Machine(SVM),were applied to the data for effective mineral mapping.The best-performing method,i.e.,SVM,was validated using ground-truth information obtained during field observations.The results from the classification methods revealed accuracies of 59.57%for SAM and 69.25%for SVM.The HySpex hyperspectral data obtained using a super-low altitude detection platform proved highly effective for detecting altered rock information.Thus,this approach has great potential for the rapid identification of geological and mineralogical features,especially in complex terrains.
