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1)  ecological habitat classifying sampling
生态立地分类抽样
1.
According to the situation that Rosa roxburghii resources in Guizhou Province is not clear and this illegibility has affected further exploitation of Rosa roxburghii products This paper based on investigation and research proposes two methods for surveying Rosa roxburghii, one being ecological habitat classifying sampling and another being simple random sampling.
 针对我省刺梨资源不清,影响刺梨产品进一步开发的现状,本文在调查研究的基础上,提出了生态立地分类抽样和简单随机抽样两种调查方法。
2)  stratified sampling
分类抽样
3)  Land eco_classification
土地生态分类
4)  ecological land classification
生态土地分类
1.
Quantitative classification and ordination aiming to realize multifactor ecological land classification was developed for the mountainous region in eastern Liaoning Province.
本研究共得到6种群落类型,能够基本指示研究区潜在的植被类型,可用于表征生态土地分类中分类单元的植被类型。
2.
Ecological land classification (ELC) is the main approuch and direction of land classification.
生态土地分类是目前土地分类的主要方向和趋势 ,国际上早已开展此项研究 。
3.
Land system is the basic unit of ecological land classification which is different from the site classification.
另一方面,也说明生态土地分类注意人类影响程度和土地利用,更加易于和土地分类规划相结
5)  ecostratigraphic classification
生态地层分类
6)  Site classification
立地分类
1.
Quantitative study on the site classification of key county in the conversion of farmland to forestland;
退耕还林重点工程县立地分类定量化研究
2.
Discuss and Value the Site Classification of Mao Bamboo Forest in Pinyin Forest Farm of Fengchen City;
丰城市国营坪荫林场毛竹立地分类与评价
3.
Comparative analysis of site classification based on crop yield index and cluster analysis;
基于作物产量指标和聚类分析的立地分类比较研究(英文)
补充资料:分类抽样
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性质:又称分类抽样或类型抽样。将总体划分为若干个同质层,再在各层内随机抽样或机械抽样,分层抽样的特点是将科学分组法与抽样法结合在一起,分组减小了各抽样层变异性的影响,抽样保证了所抽取的样本具有足够的代表性。分层抽样根据在同质层内抽样方式不同,又可分为一般分层抽样和分层比例抽样,一般分层抽样是根据样品变异性大小来确定各层的样本容量,变异性大的层多抽样,变异性小的层少抽样,在事先并不知道样品变异性大小的情况下,通常多采用分层比例抽样。

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