不同经营模式下新银合欢的枝系特征差异分析

在中国科学院东川泥石流定位观测站附近，对不同经营模式下新银合欢的枝系特征进行了统计分析，结果表明：新银合欢在不同经营模式下的总体分枝率和逐步分枝率SBR1:2发生显著变化，逐步分枝率SBR2:3则未表现出显著差异；截干新银合欢二、三级枝长度，枝径比2：1及一、二、三级枝倾角显著大于未截干新银合欢；两种经营模式下叶片的分布特征未发生显著差异。通过对各种枝系特征综合分析，发现截干新银合欢的生长对策表现为向上拓展自身生长空间，保持其原有的生态位。

Branching Patterns Variation of Leucaena leucocephala In Different Management Patterns

In plantation of Leucaena leucocephala in Dongchuan station of debris flow observation and re-search, Yunan Province, the branching patterns of Leucaena leucocephala in different management patterns were examined. The results showed that overall bifurcation ratio and stepwise bifurcation (SBR1:2) varied signif-icantly among different management patterns, but the stepwise bifurcation (SBR2:3) didnt vary significantly. The second-order and third-order branch length, branch angle to horizon and ratio of branch diameter in cop-pice management are significantly different with non-coppice management, but the characteristics of leaf distri-bution of two management patterns were similar. In coppice management patterns, the architectural counter-measure showed that: Leucaena leucocephala will expand its living space through sprouting from its base.