Autoinhibition of germination and seedling establishment by leachate of Calluna vulgaris leaves and litter

被引：25

作者：

Bonanomi G. ^{[1
]}

Legg C. ^{[2
]}

Mazzoleni S. ^{[1
]}

机构：

[1] Dipartimento di Arboricoltura, Botanica e Patologia Vegetale, University of Naples Federico II, Portici 80055 NA

[2] School of GeoSciences, University of Edinburgh, Edinburgh EH9 3JN, Crew Building

来源：

Community Ecology | 2005年 / 6卷 / 2期

关键词：

Aerobic-anaerobic decomposition; Autotoxicity; Seed germination; Seed regeneration; Seedling survival;

D O I：

10.1556/ComEc.6.2005.2.8

中图分类号：

学科分类号：

摘要：

Allelopathic effects of Calluna vulgaris have been extensively studied, but little attention has been given to the dynamics of phytotoxicity during the decomposition of its litter. Strong evidence from vegetation dynamics and management strategies indicate that Calluna litter inhibits its own seed regeneration. This work investigates the hypotheses that Calluna tissues are autotoxic and that decomposition processes moderate this effect. Water extracts of fresh Calluna shoots, litter and surface soil from a burned stand were used in both aerobic and anaerobic conditions to test for phytotoxicity in Lepidium sativum and Calluna vulgaris seeds and seedlings. Phytotoxicity varied for undecomposed Calluna materials with the following rank: shoots ≫ litter > burned soil. Moreover, phytotoxicity on Lepidium and Calluna of all tested materials sharply decreased during aerobic decomposition, but it remained high in anaerobic conditions. This paper confirms that Calluna shoots and litter are autotoxic, and demonstrates clear patterns related to decomposition processes. The potential consequences for vegetation dynamics are discussed. © Akadémiai Kiadó, Budapest.

引用

页码：203 / 208

页数：5

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