摘要
本文采用频次拟合法和Iwao法,对水稻不同生育期鼠害田间分布格局进行了测定。结果表明:稻田鼠害株多属负二项分布,即以个体群为基本成分,呈现聚集分布型。根据田间分布型信息,得到了水稻鼠害田问调查的理论抽样数模型,以及由鼠害丛率(M)估算鼠害株率(Y)和平均密度(X)的回归估值抽样模型(经X^2检验,P>0.05)。最后,应用估值抽样模型计算鼠害防治指标,并以此建立鼠害防治的序贯决策抽样模型。
The methods of frequency comparing and Iwao were used in thispaper to survey the field distribution pattern of mouse damage in ricedifferent growth periods.The results showed that the mouse damagestem in the rice field mainly belonged to minus binomical distribution,due to the different environment of rice fields.But when the damagedstems was above 2.9 stems per clump,it was caused by both mouse ac-tivities and environmental factors.
According to the distribution,we got the theoretical sampling pat-tern and the regression estimating sampling pattern from the rate ofmouse damage clump(M)estimating the rate of mouse damage stem(Y)and mean density(X)(by the testing of X^2,P>0.05).Finally the con-trol index for mouse damage was calculated by the estimating sampling
model and then the sequential policy sampling model was set up.
出处
《植物保护学报》
CAS
CSCD
北大核心
1991年第1期91-96,共6页
Journal of Plant Protection
关键词
水稻
鼠害
田间
分布型
抽样模型
mouse harm
field distribution pattern
sampling model
