泥石流频发区人工恢复新银合欢林种内竞争--以云南东川蒋家沟流域为例

Intraspecific competition of Leucaena leucocephala plantation in the area of high frequency debris flow: Taking the Jiangjiagou Gully as an example.

采用Hegyi单木竞争指数模型和张跃西改进单木竞争指数模型,于2006年在云南省昆明市陈川区蒋家沟,对干热河谷泥石流频发区人工恢复新银合欢林种内竞争强度进行定量分析。结果表明:无论是内圈还是外圈新银合欢种内竞争强度随林木径级的增大而减小,内圈的竞争强度要大于外圈;内圈竞争强度与对象木胸径之间的关系近似服从双曲线函数关系,外圈竞争强度与对象木的胸径之间的关系近似服从幂函数关系;两个竞争指数模型均能较好地反映干热河谷区新银合欢人工恢复林种内竞争强度,但Hegyi单木竞争指数模型的适用性优于张跃西改进单木竞争模型。

Intraspecific competition intensity（ICI） in Leucaena leucocephala in the area of high frequency debris flow of Yunnan Province was quantitatively analyzed by Hegyi single-tree competition index model（STCIM） and Zhang STCIM.The results show that as a tree increases in size,ICIs in both the inner and outer circles decrease.Meanwhile,ICI of L.leucocephala in inner circles is larger than that in outer circles.Moreover,logarithmical equation actually describes the relationship between ICI in the inner circles and growth of diameter at breast height（DBH）,and exponential equation felicitously explains the relationship between ICI in the outer circles and growth of DBH.This work shows Hegyi STCIM and Zhang STCIM can simulate and predict ICI efficiently and Hegyi STCIM is superior to Zhang STCIM.