楸树无性系苗期N素利用差异和高产无性系选择  

Variation of Nitrogen Utilization among Catalpa bungei Clones at Nursery Stage and High-Yield Clones Selection

作　　者：麻文俊[1] 张守攻[1] 王军辉[1] 董菊兰 

机构地区：[1]中国林业科学研究院林业研究所林木遗传育种国家重点实验室,北京100091 [2]甘肃省小陇山林业科学研究所,天水741022

出　　处：《林业科学》2012年第10期157-162,共6页Scientia Silvae Sinicae

基　　金：林业公益性行业科研专项经费项目(201104001);农业成果转化资金项目(2008GB24320414)

摘　　要：N素是世界农林业生产中消耗量和浪费量最大的元素之一,且世界上大部分农业土壤和森林土壤N素匮乏,是作物高产和林木生长的主要限制因子（王忠,2000;黄建国,2003;王新超等,2004;樊瑞怀等,2009a）。在林业生产实践中,人工林抚育较少采取施肥措施,经常在贫瘠的土地上造林,即使施肥也会造成土壤和水体的严重污染。To select high yield and high nitrogen（N） efficiency of Catalpa bungei clones,a pot experiment with the 10 clones were conducted to observe the economic efficiency of nitrogen utilization,the coefficient of low nitrogen tolerance and stem biomass in response to nitrogen levels,i.e.,high（＋N） and low（-N） nitrogen.The results showed that there existed a significant difference in stem biomass among clones,and the stem biomass was significantly increased by high nitrogen.A significant difference was found in economic efficiency of nitrogen utilization among clones under high nitrogen,in a range from 19.274 g·g-1 to 28.055 g·g-1,whereas there was no significant difference under low nitrogen（26.403-37.637 g·g-1）.The repeatability of economic efficiency of nitrogen utilization was 0.54 and 0.78 under low and high nitrogen,respectively.With combination of stem biomass,economic efficiency of nitrogen utilization,low nitrogen tolerance and stem biomass response to nitrogen,appropriate clones were selected for different nitrogen conditions.In consequence,clone 2-7 was suitable for low and high nitrogen conditions,clone 2-8 suitable for low nitrogen,and clone 2-6,9-1 and 015-1 suitable for high nitrogen conditions.

关 键 词：楸树 无性系 N素经济利用效率 选择 

分 类 号：S722.33[农业科学—林木遗传育种]