土壤性质空间变异对飞蝗卵块分布格局的影响

利用地统计学方法,在GIS平台下研究了沿海蝗区南大港水库土壤空间变异对东亚飞蝗Locusta migratoria manilensis卵块分布格局的影响。结果表明,研究区域内土壤含盐量、5 cm土层含水量、土壤有机质和pH具有明显的空间异质性,其中前两者表现出较强的空间相关性,后两者具有中等强度的空间相关性。飞蝗卵块亦具有明显的空间自相关,且集中分布在研究区域内土壤含盐量较低(<1.9%)、含水量适中(10.1%~29.9%)的中部和东部地块,而在土壤含水量较高(>30%)的西部和盐分过重(>3%)的北部几乎没有卵块的分布。表明研究区域内飞蝗卵块的分布与土壤性质在空间上的变化有一定关系,即蝗区土壤性质空间异质在一定程度上决定了飞蝗卵块的空间分布格局。

IMPACT OF SOIL SPATIAL VARIABILITY ON SPATIAL DISTRIBUTION PATTERNS OF LOCUSTA MIGRATORIA MANILENSIS EGGPODS

Impact of soil spatial variability on spatial distribution pattern of Locusta migratoria manilensis eggpods in Nandagang reservoir,Hebei,were studied by means of geostatistical analysis and GIS techniques.Results show that soil properties,such as salt content,water content at 5 cm depth,organic matter and pH,displayed significant spatial heterogeneity,but the first two demonstrated close spatial correlation and the last two moderate spatial correlation,and the distribut ion of locust egg pods,significant spatial auto correction.Locust eggpods were mainly distributed in the central and eastern parts of the study zone,where the soil was low in salinity (<9%) and moderate in water content (10.1%~29.9%),but they were rarely found in the western and northern parts,where the soil was high in water content (>30%) and in salinity (>3%).The find ings indicate that the spatial distribution pattern of locust eggpods is mainly related to spatial variability of the soil in the study area.