[Geostatistical analysis on spatial patterns of Erythroneura sudra and Erigonidium graminicola]

The spatial construction and distribution of Erythroneura sudra and Erigonidum gramimicola at different periods were investigated with geostatisics. The results showed that the semivariogram of Erythroneura sudra was described by spherical model, indicating an aggregated spatial arrangement. The range was 25.71-37.14 m. The semivariograms of Erigonidum graminicola was fitted by spherical model too, also indicating an aggregated spatial arrangement, and its range was 25.12-44.06 m. The amount and spatial distribution of Erigonidium graminicola was closely related to that of Erythroneura sudra. It reveals that Erigonidium graminicola is the dominant natural enemies influencing the population of Erythroneura sudra.