2) Density survey
鼠密度调查
4) ultra-low density geochemical survey
超低密度地球化学调查
1.
To launch the ultra-low density geochemical survey at of Heilongjiang Province still belongs to the first time by a large scale.
在黑龙江省森林沼泽景观区大面积开展超低密度地球化学调查尚属首次,针对森林沼泽景观区有机质及硅胶含量高的特点,此次工作采样介质采用泛滥平原沉积物表层———A层土,采样密度为1样/100km2,溶矿剂采用四酸(HCl+HNO3+HF+HClO4)溶矿法。
5) survey accuracy
调查精度
1.
This paper explored the method of how to improve survey accuracy of Pinus tabulaeformis stand volume in the forest resources inventory in Yijun county.
本文就宜君县森林资源调查过程中提高油松林分蓄积量调查精度的方法做一探讨,为渭北地区森林资源调查过程中定量测算小班蓄积量,提高调查精度具有一定的指导意义。
6) monthly survey
月度调查
1.
The present balanced two-layer sample rotation system is applicable only to the monthly survey with two-stage sample designs and with small primary sampling units.
目前的平衡两层次样本轮换模式只适用于一级单元规模较小时的两阶段抽样月度调查。
2.
A two-layer rotation pattern is presented for the monthly surveys when the primary sampling units are relatively large,in which the rotation pattern for the primary sampling units is 8-4-8(16),and for the secondary sampling unit is 2-10-2(4).
对于一级单元规模较大的两阶段抽样月度调查给出了一种两层次样本轮换模式,该模式中一级单元的轮换模式为8-4-8(16),二级单元的轮换模式为2-10-2(4)。
补充资料：非密度制约因素(见密度制约因素)
非密度制约因素(见密度制约因素)
l焦非密度制约因素见生态因素、密度制约后
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条