[Objective] The aim was to explore occurrence rules and forecast methods of cotton aphid in Poyang Lake Area in Jiujiang City to enrich prediction methods of cotton aphid in the area. [Method] The occurrence rules and...[Objective] The aim was to explore occurrence rules and forecast methods of cotton aphid in Poyang Lake Area in Jiujiang City to enrich prediction methods of cotton aphid in the area. [Method] The occurrence rules and influencing factors of cotton aphid in Pengze County in 28 years were analyzed with comparative analysis, correlation analysis and wavelet analysis. Furthermore, a long-term forecast model of occurrence grade of cotton aphid and a short-term forecast model of weather condi- tion suitability were established based on stepwise regression. In addition, a forecast test was conducted in cotton area in the north of Poyang Lake. [Result] The wavelet analysis showed that in recent 28 years, oscillating period at 4 years was significant for the occurrence grade of cotton aphid in the north of Poyang Lake, but insignifi- cant for cotton at seedling stage. The comparative and correlation analyses suggest- ed that occurrence of cotton aphid is of significant correlation with winter climate and weather conditions at middle and short periods. The prediction test indicated that long-term forecast model of occurrence grade of cotton aphid and short-term forecast model of weather condition suitability based on stepwise regression can be made use of in the areas with similar climate. [Conclusion] The research provides theoreti- cal references for prevention against cotton aphid in cotton-planting area.展开更多
During the Pleistocene, the western Qaidam Basin has largely experienced strong structural reconstruction and strong erosion. First, the eroded thickness of Neogene strata was restored approximately by the stratigraph...During the Pleistocene, the western Qaidam Basin has largely experienced strong structural reconstruction and strong erosion. First, the eroded thickness of Neogene strata was restored approximately by the stratigraphic profile comparison method and plane trend surface restoring method; then, accurate calculation of erosion was recovered using vitrinite reflectance, and the erosion that was restored by the trend surface restoring method was corrected; finally, a distribution map of cumulative erosion was produced. This study marks an important achievement in that one of the most important parameters of basin tectonic evolution, sedimentary evolution, and oil and gas accumulation history has been obtained, and that a basic geological problem has been solved in the Qaidam Basin. The areas with high erosion and low erosion are shown in the map and a close relation between the distribution of oil and gas fields and erosion was recognized. Large and medium oil and gas fields are mainly distributed in areas with medium and low erosion. It is difficult to form large-scale oil and gas accumulation in areas in which erosion is more than 2000 m. The mechanism of the relation between oil and gas distribution and erosion is explained. This study will be of use in predicting the distribution of oil and gas.展开更多
[Objective] The paper was to clear the species and occurrence regularity of thrips severely occurred in leek field, and to study the main control methods. [Methods] The species of thrips on leek were identified in Sic...[Objective] The paper was to clear the species and occurrence regularity of thrips severely occurred in leek field, and to study the main control methods. [Methods] The species of thrips on leek were identified in Sichuan Province, and the damage symptoms, occurrence regularity and control methods of thrips in leek field were studied. [Result] The morphological characteristic of thrips on leek was Frankliniella occidentalis(Pergande). ITS molecular identification results showed that the amplified fragment was 520 bp, which shared the similarity of 99.81% with the base se-quence of F. occidentalis. F. occidentalis concentrated at the height of 80 cm from the ground; in sunny days, the occurrence frequency of F. occidentalis was relatively high during 15:00 and 17:00; rainwater had obvious lethal effect on F. occidentalis, and the lethal rate was 29.30%. Field trial showed that 20% dinotefuran SG and 40% acetamiprid GR had good control effect against F. occidentalis. The control effect of 20% dinotefuran SG 1 500 times dilution was the best, up to 92.56%. [Conclusion] The results will provide effective technical support for large-scale control of thrips in leek field.展开更多
基金Supported by Jiangxi Agricultural Science and Technology Supporting Program (2010BNA09900)~~
文摘[Objective] The aim was to explore occurrence rules and forecast methods of cotton aphid in Poyang Lake Area in Jiujiang City to enrich prediction methods of cotton aphid in the area. [Method] The occurrence rules and influencing factors of cotton aphid in Pengze County in 28 years were analyzed with comparative analysis, correlation analysis and wavelet analysis. Furthermore, a long-term forecast model of occurrence grade of cotton aphid and a short-term forecast model of weather condi- tion suitability were established based on stepwise regression. In addition, a forecast test was conducted in cotton area in the north of Poyang Lake. [Result] The wavelet analysis showed that in recent 28 years, oscillating period at 4 years was significant for the occurrence grade of cotton aphid in the north of Poyang Lake, but insignifi- cant for cotton at seedling stage. The comparative and correlation analyses suggest- ed that occurrence of cotton aphid is of significant correlation with winter climate and weather conditions at middle and short periods. The prediction test indicated that long-term forecast model of occurrence grade of cotton aphid and short-term forecast model of weather condition suitability based on stepwise regression can be made use of in the areas with similar climate. [Conclusion] The research provides theoreti- cal references for prevention against cotton aphid in cotton-planting area.
基金co-funded by the National Science and Technology Major Project "Chinese large gas fields' formation conditions,accumulation and objective evaluation"(grant No.2016ZX05007)the Major Special Project of Chinese Petroleum Development Technologies "A study on comprehensive supporting technologies for building oil-gas field of ten million tons in Qaidam Basin"(grant No.2016E-0102)
文摘During the Pleistocene, the western Qaidam Basin has largely experienced strong structural reconstruction and strong erosion. First, the eroded thickness of Neogene strata was restored approximately by the stratigraphic profile comparison method and plane trend surface restoring method; then, accurate calculation of erosion was recovered using vitrinite reflectance, and the erosion that was restored by the trend surface restoring method was corrected; finally, a distribution map of cumulative erosion was produced. This study marks an important achievement in that one of the most important parameters of basin tectonic evolution, sedimentary evolution, and oil and gas accumulation history has been obtained, and that a basic geological problem has been solved in the Qaidam Basin. The areas with high erosion and low erosion are shown in the map and a close relation between the distribution of oil and gas fields and erosion was recognized. Large and medium oil and gas fields are mainly distributed in areas with medium and low erosion. It is difficult to form large-scale oil and gas accumulation in areas in which erosion is more than 2000 m. The mechanism of the relation between oil and gas distribution and erosion is explained. This study will be of use in predicting the distribution of oil and gas.
基金Supported by Cooperation Project of Sichuan Academy of Agricultural Sciences and Pidu District "Integration and Demonstration of Green Prevention and Control Technology against Major Pests and Diseases in Leek"(2013YXHZPX-2)Pilot Demonstration Project of Sichuan Agricultural Scientific Achievements "Integration and Demonstration of High Yield and High Quality Production Technology of Leek"(2013ZSSH)Financial Innovation Enhancement Project of Sichuan Province "Integration and Demonstration of Green Prevention and Control Technology against Main Diseases and Pests of Vegetables"(2016GYSH-015)
文摘[Objective] The paper was to clear the species and occurrence regularity of thrips severely occurred in leek field, and to study the main control methods. [Methods] The species of thrips on leek were identified in Sichuan Province, and the damage symptoms, occurrence regularity and control methods of thrips in leek field were studied. [Result] The morphological characteristic of thrips on leek was Frankliniella occidentalis(Pergande). ITS molecular identification results showed that the amplified fragment was 520 bp, which shared the similarity of 99.81% with the base se-quence of F. occidentalis. F. occidentalis concentrated at the height of 80 cm from the ground; in sunny days, the occurrence frequency of F. occidentalis was relatively high during 15:00 and 17:00; rainwater had obvious lethal effect on F. occidentalis, and the lethal rate was 29.30%. Field trial showed that 20% dinotefuran SG and 40% acetamiprid GR had good control effect against F. occidentalis. The control effect of 20% dinotefuran SG 1 500 times dilution was the best, up to 92.56%. [Conclusion] The results will provide effective technical support for large-scale control of thrips in leek field.
