英语语法分析

Acacia dealbata and Alnus cremastogyne were selected as the species with quite fast growth on 3 indexes of tree height, ground diameter and crown mean width.

通过各树种在该立地类型上生长曲线的比较，评选出圣诞树、水冬瓜在3个生长因子上的生长速度最快。

This paper made a dynamic study of the seasonal variation of nutrient elements in the fine roots and soil from Alnus cremastogyme Burk plantations, and of the relationship between them.

对桤木人工林细根、土壤养分含量的季节变化及其两者之间的关系进行了研究。

The results suggested that obvious difference of chromosome number appeared among these Alnus species, even in the same species from different population, and spontaneous polyploidy might occur.

本次研究结果表明桤木属物种间染色体数目有明显的差异，同一物种不同居群间也有差异存在，而且可能有自然加倍现象；