Chin J Plant Ecol ›› 2009, Vol. 33 ›› Issue (1): 71-80.DOI: 10.3773/j.issn.1005-264x.2009.01.008

• Research Articles • Previous Articles     Next Articles

VARIATIONS OF SPATIAL PATTERN IN FIRE-MEDIATED MONGOLIAN PINE FOREST, HULUN BUIR SAND REGION, INNER MONGOLIA, CHINA

YU Hong, YANG Xiao-Hui*(), CI Long-Jun   

  1. Research Institute of Forestry, Chinese Academy of Forestry, Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China
  • Received:2008-06-10 Accepted:2008-07-10 Online:2008-06-10 Published:2009-01-30
  • Contact: YANG Xiao-Hui

Abstract:

Aims Our objectives were to 1) explore variations of stand structure and spatial pattern after surface fire in Mongolian pine forest of the Hulun Buir sand region and 2) elucidate surface fire as a dynamic driving force in stand thinning and succession.
Methods Fire-killed and live trees were mapped in two 1-hm2 plots one year postfire. Differences of fire intensities and stand structures were tested by the Kruskal-Wallis procedure, and spatial patterns were explored using the pair correlation function g(r).
Important findings Tree densities decreased greatly and basal areas were decreased slightly by surface fire with similar intensities. Fire-killed trees showed a nested, double-cluster, positively correlated pattern. Stems were aggregated spatially pre- and postfire; however, the ranges of significant scales were narrower postfire. Adults and saplings were independent or slightly negatively associated at small scales. We conclude that surface fire is an important driving force of stand thinning and variations in spatial pattern that influence succession to mature forest.

Key words: Mongolian pine, pair correlation function, spatial pattern, stand structure, surface fire