A Geostatistical Analysis On Spatial Patterns Of Saperda Papulnea L. In Poplars

The spatial patterns of eggs, larvae and adults of Saperda Papulnea L. in three different types of poplar forests in Jinshatan forest centre, Datong Poplars Institute were studied by using geostatistics tools. Geostatistics allows the usage of quantity and location information simultaneously to qualify the spatial pattern of insect population. The results were as follows.1 .Among three different kinds of forests, models that eggs, larvae and adults of Saperda Papulnea L. abided by varied, but they all showed spatial patterns of gregarions with variable extents. ( 1 ) In advanced highyield forest stand, three different stages conformed to linear model, showing a moderate gregarion. Size and variation scale of spatial correlation and components of spatial variation were different (eggs > larvae > adults), but ranges of spatial correlation were the same. (2 ) In general highyield forest stand, semivariogram of eggs and larvae complied with linear model, however it was exponential model for adults, showing that spatial continuity of adults was stronger. Components of spatial variation and variation scale of eggs was the highest, larvae less higher, adults the lowest. (3) In lowyield forest land, eggs and larvae conformed to spherical model showing a gregarion, and adults conformed to a linear model showing a moderate collection. Size and variation scale of spatial correlation and components of spatial variation were different (eggs > larvae > adults), but range of spatial correlation of adults were larger than eggs and larvae.2.The results of spatial variation from all directions with geostatistical analysis were showed among three different forest stands.(1)Amounts of eggs had spatial dependence with a range from 6 to 33.36m and spatial distribution of eggs had continuity. The intensity of continuity reduced with the expansion of distance ranging from 0.26 to 0.47. The range of general highyield forest was the longest, then advanced highyield forest, lowyield forest the smallest. Partial spatial continuity intensity of lowyield forest was larger than advanced highyield forest and general highyield forest stand.(2)Amounts of larvae had spatial dependence with a range from 6 to 33.36m and with a partial spatial continuity intensity from 0.292 to 0.855. Spatial dependent ranges were general highyield forest, advanced highyield forest and lowyield forest separately. As far as the partial spatial continuity intensity, the order from the largest to the smallest was lowyield forest, advanced highyield forest and general highyield forest. (3) Amounts of adults also had spatial dependence with a range from 5.64 to 33.19m. The spatial dependent distance from the largest from the smallest was general highyield forest, advanced highyield forest and lowyield forest separately.The results using Kinging to imitate spatial distribution of Saperda Papulnea L. showed that among the whole growth stages, the spatial distribution were gregarions, but the value of density varied(eggs > adults). Among different forests stands, the density value of lowyield forest was larger than general highyield forest and advanced highyield forest.4.Studies on spatial heteroplasmy of Saperda Papulnea L. population from different directions indicated that the model of semivariogram of eggs, larvae and adults in four directions are the same, but spatial dependent range are different, belonging to geometrical anisotropy. They had stronger continuity in the direction of 0° and 45° than the other two directions. Correlation scope and random extent varied with different stages. Correlation scope of former stages was larger than middle stages and later stages, and...