alder (alnus)是什么意思

用法例句

Cytological study on Alnus in China (1);

中国桤木属植物的细胞学研究(Ⅰ)

Cytological Study on Alnus Species in China;

中国桤木属植物的细胞学研究

Correlations between Alnus Host Species and Associated Endosymbiotic Frankia Populations from Nodules;

Frankia菌与桤木属宿主植物共生关系的初步研究

Study on Water Conservation Capacity of the Mixed Plantations of Alnus cremastogyne and Cunninghamia lanceolata;

桤木杉木混交林水源涵养能力研究

Variation of Fruiting Quantity and Nut and Seed Characters of Alnus cremastogyne Clones;

桤木不同无性系结实量与种实性状变异

Preliminary Report on Selection of Alnus cremastogyne Provenances/Families;

桤木地理种源/家系选择试验初报

Study on the improved potential of fine pulpwood Alnus cremastogyne Burk;

桤木优良造纸材改良潜力研究

and Alnus cremastogyne Burk mixed forests.

对20a生杉木、桤木混交林丰产效果和机理进行研究,结果表明:混交林内桤木自然保存率低于杉木;杉木单株材积、单位面积材积分别大于桤木4。

The increasing evidence for the effect of mixtures indicated mixing alder(Alnus cremastogyne Burk.

　调查了中亚热带会同地区 13a生杉木纯林 (纯林 )和 8杉木 2桤木混交林 (混交林 )的大型土壤动物群落 ,并比较了两个林分在群落结构上的差别 。

The wood properties of alder is similar to that of poplar and birch which could be used to produce different kinds of pulp.

就桤木商用种植的生产潜力、制浆造纸和材性研究现状等进行综合评述。

The alder forest distributed in the hill and mountain region in the north and middle part of Sichuan Basin had a higher nodulation capacity generally.

桤木在四川盆地中北部山丘区,普遍具有良好的结瘤能力:单株五年生林木结瘤量40～160g(鲜重),十年生最佳达200g左右。