Effects of a severe drought on water and nitrogen use by Quercus ilex and Phillyrea latifolia

被引：94

作者：

Peñuelas, J ^{[1
]}

Filella, I ^{[1
]}

Lloret, F ^{[1
]}

Piñol, J ^{[1
]}

Siscart, D ^{[1
]}

机构：

[1] Univ Autonoma Barcelona, Fac Ciencies, Ctr Recerca Ecol & Aplicac Forestals, E-08193 Barcelona, Spain

来源：

BIOLOGIA PLANTARUM | 2000年 / 43卷 / 01期

关键词：

damaged trees; stable isotopes; water stress; climate change; lithologies; water use efficiency; nitrogen availability and use;

D O I：

10.1023/A:1026546828466

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

A severe drought that took place in Spain and other Mediterranean countries in 1994 produced a dieback of Quercus ilex trees on south-facing conglomerates but only minor defoliations in trees on north-facing schists. The foliar Delta(13)C of damaged trees continued to decrease in the next two wet years probably indicating increasing water use efficiency, and their delta(15)N continued to increase indicating progressive ecosystem N saturation and/or N losses whereas there were no significant changes in undamaged trees. Pre-drought Delta(13)C values were reached in the third year after the drought, but delta(15)N values did not yet recover. Another co-occurring small tree, Phillyrea latifolia, did not show any damage and gained dominance in the most affected stands.

引用

页码：47 / 53

页数：7