| Six aggregation indices were used to identify the spatial distribution pattern of Jakowleffia setulosa. The
results show that this pest has an aggregated distribution pattern. Taylor power law analysis equation is lgS2= lg0.1987 +
2.0167lgm, b (2.0167) >1, which shows that the distribution type meets the aggregated distribution. According to Iwao's
M*-m regression equation: M *=1.492+1.206m, the basic element of distribution pattern in the desert is an individual
group, individuals are attracted to each other and the individual groups are aggregated distribution pattern. The aggregation
mean 姿(姿>2) indicates that the cause of aggregated distribution of J. setulosa is due to their own behavior and the role of
environmental factors. The theoretical sampling model of J. setulosa is n=249.22/m+20.6(D=0.1), n=62.3125/m+5.1725(D=
0.2). The sequential sampling model is T1(n), T0(n)=20n依11.52. |
