HARVEST-CREATED AND NATURAL CANOPY GAPS IN AN OAK-PINE FOREST IN MAINE

被引:20
作者
KIMBALL, AJ
WITHAM, JW
RUDNICKY, JL
WHITE, AS
HUNTER, ML
机构
来源
BULLETIN OF THE TORREY BOTANICAL CLUB | 1995年 / 122卷 / 02期
关键词
CANOPY GAPS; PARTIAL HARVEST; QUERCUS RUBRA L; PINUS STROBUS L; ACER RUBRUM L; LONG-TERM ECOSYSTEM RESEARCH; FOREST STRUCTURE; GROUP SELECTION;
D O I
10.2307/2996450
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
In relatively young, dosed canopy, temperate forests, forest management may achieve important ecological goals by using modified silvicultural techniques that mimic natural patterns of disturbance, forest structure, and stand development. This paper reports the short-term effects on canopy closure and understory vegetation of a partial harvest that removed 42% of the basal area in a 10-ha portion of a 40-ha study area dominated by 60-80 year old, post-agricultural Quernus rubra L., Pinus strobus L., and Acer rubrum L. in mid-coastal Maine. All harvest-created canopy gaps were inventoried and mapped fourteen months after the harvest. Naturally occurring ledge gaps (gaps caused by the absence of canopy trees due to extremely shallow soils or exposed bedrock) and tree gaps were mapped and measured on 30 adjacent, untreated, hectares. Tree gaps ranged from 10 m(2) to 184 m(2); over 92% were less than 50 m(2) in size and the majority were less than 25 m(2). Ledge gaps ranged from 10 m(2) to 906 m(2). The harvest-created gaps ranged from 25 m(2) to 3000 m(2). In the aggregate, tree gaps covered only 0.7% and ledge gaps only 3.2% of the uncut forest whereas the harvest-created gaps covered 26.5% of the partially cut forest. After four growing seasons, the forest floor vegetation of the three types of gaps differed significantly with junipers (Juniperus communis L.) dominating ledge gaps, ferns and tree seedlings dominating tree gaps, and tree seedlings, forbs, and slash (downed woody material left from timber harvest) dominating harvest-created gaps.
引用
收藏
页码:115 / 123
页数:9
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