Neighbor identity and competition influence tree growth in Scots pine, Siberian larch, and silver birch
Neighbor identity and competition influence tree growth in Scots pine, Siberian larch, and silver birch
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邻居身份和竞争影响赤松、西伯利亚落叶松和银桦的树木生长
DOI：
10.1051/forest/2010017
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发表时间：
2010
影响因子：
3
通讯作者：
A. Lintunen
中科院分区：
文献类型：
--
作者：
P. Kaitaniemi;A. Lintunen
摘要·以前关于白桦树、樟子松和西伯利亚落叶松之间竞争相互作用的研究没有解决附近竞争对手物种认同的直接重要性。·我们使用单一优势邻近物种的局部高丰度的主题树，研究了竞争和物种认同的共同重要性。种间邻居影响年高生长量、新梢长度和单位冠长分枝数，对樟子松的影响最大。白桦树和西伯利亚落叶松主要受竞争水平的影响，如用竞争指数估计的那样。·在苏格兰松树中，影响可能是邻居物种认同的直接结果，或者它们可能替代了与物种特定特征相关的一些不可测量变量的影响。这些功能相当的替代方案表明，简单的指数不足以衡量樟子松的邻居效应。·将单株树木的生长简单地外推到林分水平，表明樟子松和银桦在混交林中的生长速度可能比纯林快。西伯利亚落叶松对种间邻居表现出负生长反应，但在林分水平上，这种影响可能被松树或桦树生长的相应增加所抵消。
Abstract• Previous studies on competitive interactions among silver birch, Scots pine, and Siberian larch have not addressed the direct importance of the species identity of nearby competitors.• We examined the joint importance of competition and species identity, using subject trees with a high local abundance of a single dominant neighboring species. Interspecific neighbors influenced annual height increment, shoot length, and branch number per unit crown length, especially in Scots pine. Silver birch and Siberian larch were predominantly affected by the level of competition alone, as estimated with competition indices.• In Scots pine, the effects may have been a direct consequence of the species identity of neighbors or they may have acted as a substitute for the effect of some non-measured variable associated with species-specific characteristics. These functionally equivalent alternatives suggest that simple indices are not adequate measures of the neighbor effect for Scots pine.• A simple extrapolation of individual tree growth to the stand level suggested that Scots pine and silver birch may grow faster in mixed than in pure stands. Siberian larch showed negative growth responses to interspecific neighbors, but the effects may be counterbalanced at the stand level by a corresponding increase in pine or birch growth.