根据在郑州进行的冬小麦根系田间实测资料，研究了根长密度和根质量密度在砂壤土中的垂直分布。

Based on the measured data from the winter wheat fields in Zhengzhou of Henan Province, the vertical distribution of root length density(RLD)and root mass density(RMD)were analyzed.

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结果表明：烟草潜叶蛾幼虫在田间呈聚集分布，聚集强度不因种群密度的改变而改变。

The results are as follows: The distribution pattern of larvae is aggregative ( negative binomial distribution) . The aggregation dose not change with the densities of population of leaf miner.

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结果认为田间受害株密度小于0.5271时，茶黄螨危害株的田间分布为聚集分布型；

The results showed that the distribution pattern was an aggregated as the density was below 0.5271, but as the density increased, it then became uniform distribution;

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