Allelopathy as a competitive strategy in persistent thickets of Lantana camara L. in three Australian forest communities
Allelopathy as a competitive strategy in persistent thickets of Lantana camara L. in three Australian forest communities
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DOI：
10.1023/a:1009707404802
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发表时间：
1997-09-01
期刊：
影响因子：
1.7
通讯作者：
Duggin, JA
中科院分区：
文献类型：
--
作者：
Gentle, CB;Duggin, JA
通过田间试验研究了马缨丹的化感抑制作用。两种本土树种。该设计允许比较化感作用与密度依赖的资源竞争效应。火及其在竞争性相互作用中的作用被列为实验处理。测定了L.通过萌发和生长Alectryon subcinereus（A.格雷）拉德克。在10、20和30 m（-2）苗高的热带雨林交错带（Macleay River）或暖温带雨林的厚壳桂（Cryptocarya rigida（Meissner））和湿硬叶林（Lake Macquarie）中，厚壳桂（L.将camara物理移除（LR）、烧毁（LB）或切割并留在原位（LT）。完全去除L. camara（LR），而燃烧（LB）仅对C. rigida。两种树种的幼苗生长均与密度呈负相关。去除camara（LR），但在其他两个处理（LB和LT）中呈正相关。C.随着密度的增加，LT和LB的硬枝幼苗生物量分别增加47.4%（1.75-2.58 g）和68.6%（1.98-2.95 g），而LR则下降23.2%（2.93-2.25 g）。A.随着苗木密度的增加，LT和LB苗木生物量分别增加29.7%（1.95-2.53 g）和34.7%（2.25-3.03 g），而LR苗木生物量下降27.9%（3.30-2.38 g）。植物毒素稀释效应推断在LT和LB，而不是密度依赖的种内竞争，而相反的是真实的LR。幼苗生物量为C.在高密度条件下，毒素稀释引起的僵节与低密度条件下LR的反应无显著差异，但对A. subcinereus，植物毒素稀释反应显着小于LR在低苗密度。在这两个位置，中等强度的火灾（LB）与LT治疗没有显着差异，强调中等至低强度的火灾不应用于控制现有的入侵L。卡马拉。入侵种群的竞争策略，可能会修改干扰后的继承，从而使灌丛的形成和长期的持久性，影响社会动态。在管理自然群落，特别是生物多样性保护方面，需要认识到这种战略。
Field experiments were established to assess possible allelopathic suppression by Lantana camara L. of two indigenous tree species. The design allowed comparison of allelopathic effects with density-dependent resource competition effects. Fire and its role in competitive interactions was included as an experimental treatment. Allelopathic responses were measured in L. camara thickets by germinating and growing Alectryon subcinereus (A. Gray) Radlk. in dry rainforest ecotones (Macleay River) or Cryptocarya rigida (Meissner) in warm temperate rainforest and wet sclerophyll forest (Lake Macquarie) at 10, 20 and 30 seedlings m(-2), where L. camara was either physically removed (LR), burnt (LB), or cut and left in place (LT). Germination for both species increased significantly by completely removing L. camara (LR) whereas burning (LB) was significant only for C. rigida. Seedling growth for both species was negatively related to increasing density when all L. camara was removed (LR) but was positively related in the other two treatments (LB and LT). C. rigida seedling biomass increased 47.4% (1.75-2.58 g) and 68.6% (1.98-2.95 g) with increasing seedling density for LT and LB respectively and decreased 23.2% (2.93-2.25 g) for LR. A. subcinereus seedling biomass increased 29.7% (1.95-2.53 g) and 34.7% (2.25-3.03 g) with increasing seedling density for LT and LB respectively and decreased 27.9% (3.30-2.38 g) for LR. Phytotoxin dilution effects were inferred in LT and LB rather than density-dependent intraspecific competition, whereas the reverse was true for LR. Seedling biomass for C. rigida resulting from potential phytotoxin dilution at high seedling density was not significantly different from the response of LR at low seedling density but, for A. subcinereus, the phytotoxin dilution response was significantly less than LR at low seedling density. Moderately intense fire (LB) was not significantly different from the LT treatment at both locations, emphasising that moderate to low intensity fires should not be used to control existing invasions of L. camara. Competitive strategies for invasive populations are identified that may modify succession following disturbance, thereby allowing thicket formation and long-term persistence to affect community dynamics. Such strategies need to be recognised in managing natural communities, particularly for biodiversity conservation.