GRADUAL AND SUDDEN FOREST CANOPY GAPS IN ALLEGHENY NORTHERN HARDWOOD FORESTS

被引:65
作者
KRASNY, ME
WHITMORE, MC
机构
来源
CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE | 1992年 / 22卷 / 02期
关键词
D O I
10.1139/x92-019
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
To determine the importance of gradual tree death to gap dynamics in Allegheny northern hardwood forests, line transect surveys of gaps and gap makers were conducted in three mature forests in central New York. Of the total number of gaps, 71.7% were classified as gradual gaps, meaning they were partial openings in the canopy caused by either trees with greater than 50% branch loss or standing dead trees. Sudden gaps, caused by trees that had fallen, constituted 9.7% of the total number of gaps. Another 18.6% of the gaps had mixed causes. American beech (Fagus grandifolia Ehrh.), which is subject to beech bark disease in the study area, was the predominant gap maker, representing 52.4% of the gap makers compared with 25.6% of the canopy trees. It is suggested that future studies forest gap dynamics include measures of gaps forming over a period of time, particularly in forests subject to decline and biotic diseases and in other forests where gradual tree death and standing dead trees are known to be important.
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页码:139 / 143
页数:5
相关论文
共 28 条
[1]   SPECIES COMPOSITION IN GAPS AND STRUCTURE OF A TROPICAL FOREST [J].
BROKAW, NVL ;
SCHEINER, SM .
ECOLOGY, 1989, 70 (03) :538-541
[2]   GROWTH AND CANOPY ARCHITECTURE OF SHADE-TOLERANT TREES - RESPONSE TO CANOPY GAPS [J].
CANHAM, CD .
ECOLOGY, 1988, 69 (03) :786-795
[3]  
CANHAM CD, 1984, THESIS CORNELL U ITH
[4]  
DEVRIES PG, 1974, FOREST SCI, V20, P129
[5]  
EHRLICH J, 1934, AN J RES, V10, P593
[6]   VEGETATION PATTERNS IN A VIRGIN SUBALPINE FOREST AT CRAWFORD NOTCH, WHITE MOUNTAINS, NEW-HAMPSHIRE [J].
FOSTER, JR ;
REINERS, WA .
BULLETIN OF THE TORREY BOTANICAL CLUB, 1983, 110 (02) :141-153
[7]  
FOSTER JR, 1986, VEGETATIO, V68, P109
[8]   PROPOSED SCENARIO FOR DIEBACK AND DECLINE OF ACER-SACCHARUM IN NORTHEASTERN USA AND SOUTHEASTERN CANADA [J].
GREGORY, RA ;
WILLIAMS, MW ;
WONG, BL ;
HAWLEY, GJ .
IAWA BULLETIN, 1986, 7 (04) :357-369
[9]   5 YEARS OF TREE DEATH IN A FAGUS-MAGNOLIA FOREST, SOUTHEAST TEXAS (USA) [J].
HARCOMBE, PA ;
MARKS, PL .
OECOLOGIA, 1983, 57 (1-2) :49-54
[10]  
HOUSTON DR, 1975, J FOREST, V73, P660