Growth responses of Picea mongolica seedlings to defoliation rate

编号 zgly0000363272

文献类型 期刊论文

文献题名 Growth responses of Picea mongolica seedlings to defoliation rate

学科分类 220.99;林学其他学科

作者 ZOUChun-jing  HANShi-jie  QIShu-yan  XUWen-duo  LIDao-tang 

作者单位 CollegeofLifeScience＆Biotechnology  ShanghaiJiaotongUniversity  Shanghai200030  China//InstituteofAppliedEcology  ChineseAcademyofSciences  Shenyang110016  China  InstituteofAppliedEcology  ChineseAcademyofSciences  Shenyang110016  China  NormalCollege  ShenyangUniversity  Shenyang110016  China  CollegeofLifeScience＆Biotechnology  ShanghaiJiaotongUniversity  Shanghai200030  China 

母体文献 Journal of Environmental Sciences;环境科学学报: 英文版 

年卷期 2005,17(2)

页码 232-236

年份 2005 

分类号 S791.18 

关键词 落叶率  云杉森林  贫瘠地区  中国  内蒙古自治区  生长环境 

文摘内容 Picea mongolica W. D. Xu. is an endemic species in China. The spruce forest is only found in semi-arid habitat in Inner Mongolia Autonomous Region of China. Based on the simulative defoliation experiment, it was proved that Picea mongolica seedlings had the compensatory and overcompensatory effects under the certain defoliation rate. The results of variance analysis on growth indexes showed that in PM I (natural regeneration seedlings under Picea mongolica forest), the differences of H1 (height in June 23 ) and H2 (height in September 3) were extremely significant, and the difference of D(diameter at the breast height) were not significant. In PM Ⅱ (artificial regeneration seedlings under Betula platyphylla Suk. forest), the difference of H1 was significant, the difference of H2 was not significant, and the difference of D was extremely significant. The regression equations were established and the compensatory and overcompensatory points were obtained. In PM I, the compensatory points of H1, H2, and D were 0.7628, 0.7436, 0.5725, and the overcompensatory points were 0.6056, 0.5802 and 0.2909 respectively. In PM Ⅱ, the compensatory points of H1, H2, and D are 0.5012, 0.3421, 0.2488, and the overcompensatory points are 0.4137, 0.2633 and 0.0747 respectively. These results suggested that the induction of compensatory growth mechanisms in spruce seedlings required a threshold level of defoliation, and the insects in Picea mongolica forest could be controlled in a certain de clree。