摘要
2005年在扬州市邗江区1块50 m×105 m的稻田做网格取样调查,利用地统计方法对灰飞虱成、若虫的时空动态进行了初步分析。在14次调查低龄若虫、高龄若虫和长翅成虫拟合得到的变差函数模型中,符合球状模型、指数模型和高斯模型的分别有20、13和9个。大多数数据各向异性显著,且方向与水稻行方向密切相关。与若虫相比,成虫的各向异性表现出很强的随机性;大部分数据的空间自相关性中等或较弱,其中低龄若虫的空间结构受成虫产卵行为影响而表现无规律,高龄若虫的随机性强度与密度成负对数曲线相关,长翅型成虫则随机性一直很强。对其时间序列上的克立金插值图分析得出,施药对飞虱田间分布的影响显著。若虫的分布情况相对稳定,长翅型成虫则在高峰期有扩散的现象。成、若虫在空间结构和田间分布上的特点主要是由其自身行动能力所决定,而成虫产卵和施药等也是其影响因素。
An experiment was conducted on grid samples in a 50m by 105m rice paddy in Hanjiang borough of Yangzhou city from July 20th to September 25th in 2005 to analyze spatio-temporal dynamics of Laodelphax striatellus Fall6n by geostatistical methods. There were 20, 13 and 9 semirariograms in all semivariograms of the small larvae, large larvae and macropterous adults those best fitted the spherical model, the exponential model and the Gaussian model respectively. Majority of the datasets showed significant anisotropy, and the direction Of which greatly correlated with plant row direction of rice paddy, and the anisotropy of macropterous adults showed stronger randomicity than larvae. Most of the datasets exhibit- ed low or medium spatial dependence, there into the relative nugget of small larvae was ruleless caused by the oviposition of macropterous adults, and the relative nugget of large larvae fitted a negative logarithm curve with the density, while that of macropterous adults was always strong. SBPH distribution interpolation maps were made by Ordinary Kriging method, which indicated that pesticide had significant effect on SBPH distribution, the larvae had a relative steady-going spatial distribution, and macropterous adults dispersed in the peak time. Besides the factors of pesticide and oviposition behavior of adults, spatial structure and distribution of larval and adult SBPH depended on the movement ability.
出处
《中国植保导刊》
北大核心
2011年第12期5-10,共6页
China Plant Protection
关键词
灰飞虱
地统计
时空动态
Laodelphax striatellus （Fall6n）
geostatistics
spatio-temporal dynamics
