DYNAMICS OF SOIL NITRATE AFTER FOREST FERTILIZATION AS MONITORED BY THE PLANT NITRATE REDUCTASE ASSAY

被引:9
作者
HOGBOM, L
HOGBERG, P
机构
[1] Department of Forest Site Research, Swedish University of Agricultural Sciences
关键词
D O I
10.1016/0378-1127(91)90010-S
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Nitrate reductase activity (NRA) of the grass Deschampsia flexuosa (L.) Trin., was used to monitor available soil nitrate after fertilization of coniferous forests in northern Sweden with ammonium nitrate or urea (300 or 150 kg N ha-1). Small plots (9 m2), at three sites of different quality class, were followed for 2-3 years. The poorest site is a groundwater recharge area, whereas discharges occur temporarily at the intermediate site and frequently at the richest site; these variations in transport of solutes explain the differences in productivity. Applications of ammonium nitrate gave, as expected, rapid and substantial increases in NRA. In the case of urea, slow and small increases in NRA indicated that nitrification took place. Treatment with ammonium chloride at the poorest site (pH 4.0) produced an increase in NRA similar to that given by urea application. On ammonium nitrate treated plots in discharge areas, there was a decline from peak NRA to levels near those of the controls within 2 weeks, in connection with a period of rainfall and high groundwater level. On plots treated with ammonium nitrate in the recharge area, soil nitrate remained at a high level throughout the first growing period. We suggest that leaching of nitrate may be a common phenomenon in discharge areas. We further suggest that N-15 fertilizer budgets, which have been conducted only in recharge areas, should also be carried out at sites with discharge.
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页码:223 / 238
页数:16
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