摘要
桤木(Alnus cremastogyne Burk)原分布于我国西南山丘,是一种非豆科固氮树种,由于其固氮能力强,具有特殊的耐瘠性而被广泛种植。但是桤木的固氮能力受到多种因素的影响,围绕着如何提高其固氮能力,刘国凡对四川省桤木结瘤固氮特性及不同土壤条件与桤木结瘤固氮关系作了研究。近十年来浙江省等亚热带地区弓1种栽培桤木面积日趋扩大,但对引种后桤木结瘤固氮的特性研究甚少。本文从浙江富阳气候特点出发,结合当地典型土壤,观察夏季高温干旱期及早期过后桤木的生长和结瘤固氮情况,以了解桤木对本地土壤和气候的适应性,为适地适树引种桤木提供依据。
Ivestigations were conducted during the drought and after the drought on the growth, nodulation and nitrogen-fixation of Alnus cremastogyne Burk planted in local soils of three typical categories. The results showed: 4-year-old or over 4-year-old A. cremastogyne had fairly high drought-resistance, but A. cremastogyne of three years old or younger are sensitive to drought. The trees damaged by the drought the most in river alluvial deposit soil, the second in hangh red soil, the third in gully fen aging red soil. Drought killed many trees of A. cremastogyne, the nitrogen content in leaves of the survivors decreased. Leaves, roots and nodules of the survivors partly withered. Drought also made nitrogen-fixation activity of root nodules dropped down to zero. After drought at least two months are needed for A. cremastogyne to recover. Although A. cremastogyne which grew in gully fen aging red soil didn't suffer much from drought during drought period, whereas in raining season when the soil was filled with water the growth of roots and nodules of A. cremastogyne stopped. Therefore from July to November the growth and nitrogen-fixation amount of A. cremastogyne cultivated in local soil were far less than that grew in the original place.
出处
《林业科学研究》
CSCD
北大核心
1992年第2期225-230,共6页
Forest Research
关键词
桤木
立地条件
抗旱性
结瘤
固氮
Alnus cremastogyne
site condition
drought-resistance
nodulation
nitrogen-fixation
