Geostatistic analysis for Myzus persicae and Erigonidium graminicola population in the compound ecosystem of peach orchards
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Key Words：Trifolium repens, peach orchard, Myzus persicae, Erigonidium graminicola, spatial pattern, geostatistics
Abstract：The study was conducted in the Shanghai Municipality of Eastern China (12141°E, 3103°N, 43 m elevation) to evaluate the potential of ground cover vegetation in enhancing the pest\|controlling ability of natural enemies to pests in peach orchards. Based on the principles of geostatistics and geographic information system (GIS), the spatial distribution pattern and spatial correlation for Myzus persicae (Sulzer) and Erigonidium graminicola Sundevall population in different periods in the compound ecosystem of peach orchards with ground cover vegetation was analyzed. The spatial distribution of M. persicae and E. graminicola population was also simulated by ordinary Kriging interpretation. The results indicated that M. persicae and E. graminicola population of different periods was both correlated spatially in the study area, respectively; the ideal semivariograms of M. persicae and E. graminicola could be described by Gaussian, Circular, Exponential or Spherical Model which all indicated aggregated spatial arrangement; the both ranges of M. persicae and E. graminicola varied from 68630-120903 m, 68630-126980 m, respectively; the proportion of spatial structure of M. persicae and E. graminicola was 00113-06546, 00676-06129, respectively. It could be concluded that the “following effect” of E. graminicola on M. persicae existed in spatial distribution and E. graminicola population had great controlling effect on M. persicae, and revealed that E. graminicola was the dominant natural enemy influencing M. persicae in the compound ecosystem of peach orchards with ground cover vegetation.