The Study Of Monitoring Model For Apocheima Cinerius Erschoff In Lower Reaches Yankand River Valley Based On MODIS Temperature Products

Populus euphratica forest is a kind of plain desert riparian forest which can Windbreak and sand-fixation,conserving soil and water,regulating climate,ecological value and social significance are very important In recent years,the insect pest of Populus euphratica has brought great threat to the survival of Populus euphratica forest.Remote sensing technology can meet the requirements of large scale,real-time monitoring,research using remote sensing data in time and space information has great application value,has an important significance for further research in theory and application.The study of Yankand river valley Populus forest distribution concentrated distribution area as the study area of Populus euphratica forest,the occurrence time of insect pests was studied,using remote sensing technology to extract remote sensing temperature data from MODIS,combined with the field investigation information pests cinerarius,using the effective accumulated temperature model to calculate the threshold temperature and effective accumulated temperature of the insect larvae under the remote sensing temperature,the developmental duration and the time of occurrence of each insect state from 2001 to 2015 were calculated,using statistical analysis,a monitoring model for the occurrence and occurrence of insect pests in Populus euphratica,study on remote sensing monitoring of insect pest occurrence in spring looper.The main conclusions are as follows:(1)The MODIS Temperature Products as the data source,the use of remote sensing image processing software to extract the sample of the remote sensing data of temperature change trend and correlation analysis of remote sensing data and meteorological data of temperature temperature,significant correlation between the two,the linear relationship between the accuracy of 93.5% MODIS provided basic information for temperature data can be used as a place of Paleacrita vernata.(2)According to the temperature remote sensing data analysis Paleacrita vernata activity period average temperature change trend from 2001 to 2015,the average temperature of spring cankerworm activity trend is slowly reduced,the damage period Paleacrita vernata gradually extended.(3)After the emergence of the insect larvae,the environmental temperature is much higher than the starting temperature,the time of occurrence of each insect state is greatly shortened,and the short period of the spring time of Populus euphratica in Xinjiang is short.(4)Use the effective accumulated temperature model,calculated from 2001 to 2015 Paleacrita vernata different stages occurred duration and occurrence time range,combined with the analysis conclusion is the best prevention period of spring of two instar geometrid larvae stage of Populus Paleacrita vernata growth schedule.(5)The 15 years of Populus cinerarius the insect occurrence time data correlation analysis,and then to the different stages of the stage the average temperature factor,multivariate regression analysis was used to construct multivariate linear model of Populus Paleacrita vernata occurrence period forecasting analysis.(6)Using the temperature trend method and physiological index method,analysis of the characteristics of the amount and temperature trend of Populus cinerarius pests,the temperature change of 2001,2012,2014 is intense,the occurrence of Populus cinerarius affected the pests to a lesser extent.On the basis of spring stone electric overwintering pupae mortality and through summer and winter two season of extreme temperature related analysis,the correlation is not obvious,is not easy to summarize its occurrence regularity.