摘要
2009年3～7月在镇沅县古城乡,以滇西南5个州(市)9个县选出的西南桦用材优树为材料,开展不同地理种源的西南桦苗期生长性状变异分析,结果表明:不同地理种源西南桦苗期生长存在极显著差异,其中以景洪和江城种源表现最好,而镇沅种源表现最差;苗期生长性状与产地纬度、海拔呈极显著的负相关,同年均温、≥18℃积温呈极显著的正相关,不同地理种源西南桦苗期生长变异模式为纬向渐变型,产地热量是造成苗期生长纬向渐变模式的主要环境因子;依据苗期苗高生长性状,通过欧氏最小距离聚类法可以将9个西南桦种源分成3类,第1类为景洪、江城种源,第2类为瑞丽、潞西、陇川、耿马、西盟种源,第3类为昌宁、镇沅种源。
Taking the seeds from selected-out quality mother trees grown in 9 counties of Southwest Yunnan province as the studied materials, the seedling growth variation of Betula alnoides provenance was studied in Gucheng township of Zhenyuan County from March to July in 2009. The seedling growth of the different provenances reaches the extreme marked level, the growth performance Jinghong and Jiangcheng are the best, and the lowest growth is Zhenyuan. The growth performance is negatively correlated with latitude and elevation, positively correlated with mean annual temperature and 〉i 18~C accumulated temperature. Geographic variation pattern is exist in seedling growth of Betula alnoides, the heat is the main factor causing this kind of pattern. Based on the height growth of seedlings, using European minimum distance cluster method, the tested 9 provenances can he divided into three grades, the first grade includes 3 provenances namely Jinghong and Jiangcheng, the second grade includes 5 provenances namely Ruili, Luxi, Longchuan, Gengma and Ximeng, the third grade includes 2 provenances namely Changning and Zhenyuan.
出处
《西部林业科学》
CAS
2011年第4期65-69,共5页
Journal of West China Forestry Science
基金
国家林业公益性行业科研专项项目(200704041)
中央财政林业科技推广示范项目(2009TQYN01)资助
关键词
西南桦
种源试验
苗期性状
生长变异
Betula alnoides
provenance test
seedling character
growth variation
