GROWTH-RESPONSE OF YOUNG, THINNED DOUGLAS-FIR STANDS TO NITROGEN-FERTILIZER IN RELATION TO SOIL PROPERTIES AND TREE NUTRITION

被引:29
作者
HOPMANS, P
CHAPPELL, HN
机构
[1] UNIV WASHINGTON,COLL FOREST RESOURCES,STAND MANAGEMENT COOPERAT,SEATTLE,WA 98195
[2] DEPT CONSERVAT & NAT RESOURCES,KEW,VIC 3101,AUSTRALIA
来源
CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE | 1994年 / 24卷 / 08期
关键词
D O I
10.1139/x94-217
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Application of 224 kg N/ha to young, thinned stands of Douglas-fir (Pseudotsuga menziesii (Mirb.) France) at 35 sites in western Oregon and Washington significantly increased basal area and volume increment over 8 years following treatment. However, response varied considerably between sites, and relative volume increment exceeded 10% at only 19 of the 35 sites. Response to applied N was evaluated in relation to forest floor and soil variables as well as to levels of N in foliage. Relative responses in basal area and volume were significantly correlated with total N concentration and the C/N ratio of the soil. However, these relationships explained only part (18-22%) of the observed variation in response. In contrast, relative response was strongly correlated with the level of N in the foliage of nonfertilized trees at 11 sites, accounting for 94% of the variation between sites. Use of foliar N data clearly has potential to predict growth responses to N fertilization of young thinned Douglas-fir stands, although further work is needed to test the relationship for a wider range of sites and stands.
引用
收藏
页码:1684 / 1688
页数:5
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