The generation and damage regulation of red turpentine beetle (Dendroctonus valens) are studied with the method of sample plot and tree-by-tree survey.
采用标准地调查和单株调查的方法，研究了红脂大小蠹的发生和危害规律。
In a 2012 survey, 71 percent of tree-fruit growers and almost 80 percent of raisin and berry growers said they were short of labor.
在2012年的一项调查中，71%的果树种植者和近80%的葡萄干和浆果种植者表示他们劳动力短缺。
The survey shows the fruit tree iron deficiency disease is serious in alkaline soil and it causes bourgeon wither of trees, poor growth and lower or no yield.
调查表明，果树缺铁性生理病害在碱性大的土壤里表现严重，导致果树枝梢枯死，生长不良，果实减产甚至绝收。
Through the typical sample survey, I have ascertained the output of bow leaf of oak tree seed.
通过典型抽样调查，查明甘肃林区主要建群树种橡树的籽壳碗叶的产量；
The research method of quantifying the structure of street tree populations was mainly described from the survey method selection and the calculation of the parameters of street tree populations.
本文主要从调查方法选择和群落结构特征参数计算两方面阐述了城市街道绿化树种结构量化研究方法。
This paper is a brief survey of several methods for decision tree simplification, including the pre-pruning, post-pruning and the other methods.
论文是决策树简化方法的一个综述，包括预剪枝、后剪枝和其它方法。
Based on the survey from 32 belt-transects and 779 quadrats, it was found that slope, seed-tree, and shrub growth status are the main factors which affect natural regeneration on clear-cut sites.
通过对32个样带779个样方的调查，认为坡度、留母树否、灌木生长状况是影响皆伐后天然更新的主要因子。
Based on the survey from 32 belt-transects and 779 quadrats, it was found that slope, seed-tree, and shrub growth status are the main factors which affect natural regeneration on clear-cut sites.
通过对32个样带779个样方的调查，认为坡度、留母树否、灌木生长状况是影响皆伐后天然更新的主要因子。
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