Seasonal dynamics, especially autumnal retranslocation, of nitrogen and phosphorus in foliage of dominant and suppressed trees of beech, Fagus sylvatica
Seasonal dynamics, especially autumnal retranslocation, of nitrogen and phosphorus in foliage of dominant and suppressed trees of beech, Fagus sylvatica
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山毛榉、水青冈优势树和抑制树叶子中氮和磷的季节动态，特别是秋季再迁移
DOI：
10.1080/02827588609382425
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
I. Stjernquist
中科院分区：
文献类型：
--
作者：
H. Staaf;I. Stjernquist
测定了柴木榉幼林叶片氮、磷含量的季节变化。比较了优势树的上、下树冠和受抑制树的枝叶。在树木之间，衰老过程中的养分重转运速率差异很大。这种变异似乎与环境因素或树木活力的任何差异无关，可能是遗传诱导的。在优势树中，氮的再转运效率最高的是树冠上部，这可能是由于日照叶片比遮荫叶片的叶温更高，衰老期更长。抑制乔木的磷转运效率高于优势乔木，但在n上没有这种趋势。不同冠级叶片间磷转运开始的时间差异最明显；下冠层叶片P的外流始于6月，而上冠层叶片P的外流尚未开始。
Seasonal changes in the N and P content of foliage in a young forest of Fagus sylvatica were measured. Leaves from branches of the upper and lower crown of dominant trees and from suppressed trees were compared. Nutrient retranslocation rates during senescence differed considerably between trees. This variation appeared not to be related to any differences in environmental factors or tree vigour, and was probably genetically induced. In dominant trees the most efficient retranslocation of N was recorded in the upper crown and probably resulted from higher leaf temperatures and a longer senescent period in the sun leaves than in the shade leaves. Phosphorus retranslocation efficiency was higher in suppressed trees than in dominant ones, but no such tendency was observed with N. The most obvious difference between leaves at different crown levels concerned the time at which P translocation began; an outflow of P from leaves in the lower crown began in June, while in the upper crown this outflow did not begi...