NITROGEN-METABOLISM OF DOUGLAS-FIR AND SCOTS PINE AS AFFECTED BY OPTIMAL NUTRITION AND WATER-SUPPLY UNDER CONDITIONS OF RELATIVELY HIGH ATMOSPHERIC NITROGEN DEPOSITION

被引：14

作者：

PEREZSOBA, M

DEVISSER, PHB

机构：

[1] Research Institute for Plant Protection (IPO-DLO), GW Wageningen, NL-6700

[2] Department of Soil Science and Geology, Agricultural University Wageningen, AA Wageningen, NL-6700

来源：

TREES-STRUCTURE AND FUNCTION | 1994年 / 9卷 / 01期

关键词：

FERTILIZATION; IRRIGATION; NITROGEN METABOLISM; PINUS-SYLVESTRIS; PSEUDOTSUGA-MENZIESII;

D O I：

10.1007/BF00197865

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

Nitrogen metabolism of the needles of 40-year-old Douglas fir and Scots pine trees, growing in two forest stands on cation-poor and acidic sandy soil with a relatively high atmospheric nitrogen deposition was studied. The composition of the free amino acid (FAA) pool, the concentrations of total nitrogen and soluble protein and the activities of glutamine synthetase (GS) and glutamate dehydrogenase (GDH) were determined in the needles. An excessive nitrogen supply by a high atmospheric nitrogen deposition in both forest stands was indicated by the high concentrations of total nitrogen and the amino acids arginine, glutamic acid, glutamine and aspartic acid in control trees. In addition the effect of optimal nutrition and water supply (fertigation) on the needle nitrogen metabolism was evaluated. The total concentration of the FAA pool in needles of both tree species was lower in the fertigated than in the non-fertigated (control) trees, except for 1-year-old needles of Scots pine, in which the concentration after fertigation did not differ from the control. The lower total FAA concentration in the fertigated trees could be attributed to arginine, the concentration of which was on average 60% lower than in the control. Neither the concentration of soluble protein nor the activity of GS were influenced by fertigation. The activity of GDH in fertigated trees only differed significantly from the control in October. Scots pine needles had higher concentrations of protein (50%) and higher activities of GS (44%) and GDH (25%) than Douglas fir needles. Possible explanations for the lower vitality of Douglas fir compared to Scot pine are given.

引用

页码：19 / 25

页数：7

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