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• 研究报告 • 上一篇    下一篇

太白山北坡光资源斑块与独叶草种群分布的耦合关系

刘喆1,2,岳明1**   

  1. 1西部资源生物与现代生物技术省部共建教育部重点实验室, 西北大学, 西安 710069; 2国家林业局西北林业调查规划设计院, 西安 710048)
  • 出版日期:2014-04-10 发布日期:2014-04-10

Coupling relationship between sunfleck and distribution of Kingdonia uniflora on the north slope of Mt. Taibai.

LIU Zhe1,2, YUE Ming1**   

  1. (1Key Laboratory of Resource Biology and Biotechnology in Western China (Northwest University), Ministry of Education, Xi’an 710069, China; 2Northwest Institute of Forest Inventory, Planning and Design, State Forestry Administration, Xi’an 710048, China)
  • Online:2014-04-10 Published:2014-04-10

摘要: 独叶草(Kingdonia uniflora)是我国稀有濒危植物,在其分布区内呈斑块状分布。本研究采用数字影像技术、地理信息系统和数字冠层分析系统对太白山北坡独叶草分布地段林下光资源斑块、林冠结构特征、土壤理化性质进行了分析。结果显示:有独叶草分布的样方中光斑数量、光斑面积及光斑指数值均显著低于无独叶草分布的样方;有、无独叶草样方上层林冠结构差异显著,有独叶草分布地段的冠层散射透过系数、直射透过系数和林冠空隙面积均显著小于无独叶草分布地段,而叶面积指数与之相反;两类样方土壤理化性质均无显著差异。因此,推测在太白山北坡林下光斑可能是决定独叶草斑块状分布的主导因子之一。

关键词: 土壤养分, 土壤酶活性, 生物结皮, 黄土高原, 藓结皮

Abstract: Kingdonia uniflora is an endemic endangered clonal species in China and shows a patchy distribution pattern on small scales within its distribution area. In the present study, using Digital Photography Technology, Geographic Information System and Digital Plant Canopy Imager, we analyzed the dynamics of sunfleck, canopy structure, soil physical and chemical properties in forest within the K. uniflora distribution on the north slope of Mt. Taibai in China. The results showed that the number and area of sunfleck and the sunfleck index in sampling plots were significantly lower with than without K. uniflora. There were significant differences in canopy structure between the two types of plots. The transmission coefficients for diffuse penetration, the transmission coefficients for radiation penetration and the canopy gap area in the plots were smaller with than without K. uniflora, while the leaf area index was vice versa. In addition, there were no statistically significant differences in measured soil physical and chemical properties among the two kinds of plots. Therefore, we speculate that sunfleck is likely one of leading factors determining the distribution of K. uniflora on the north slope of Mt. Taibai.

Key words: moss crust, soil enzyme activity, soil nutrient, biological soil crust, Loess Plateau