Large-scale spatial patterns of forest structural diversity

被引:37
|
作者
McRoberts, R. E. [1 ]
Winter, Susanne [2 ]
Chirici, Gherardo [3 ]
Hauk, Elmar [4 ]
Pelz, Dieter R. [5 ]
Moser, W. Keith [1 ]
Hatfield, Mark A. [1 ]
机构
[1] USDA, Forest Serv, St Paul, MN 55108 USA
[2] Tech Univ Munich, Dept Ecol, D-85354 Freising Weihenstephan, Germany
[3] Univ Molise, Dept Environm & Land Sci, Isernia, Italy
[4] Fed Res & Traning Ctr Forests, A-1131 Vienna, Austria
[5] Univ Freiburg, Dept Forest Biometry, D-79085 Freiburg, Germany
关键词
D O I
10.1139/X07-154
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Forest structural diversity was estimated for an ecological province in the north-central region of the United States of America using data for nearly 350 000 trees observed on > 12 000 forest inventory plots. Each plot was 672 m(2) in area, and the sampling intensity was approximately 1 plot/2400 ha. Two indices were used for each of two commonly and accurately measured inventory variables: species count and the Shannon index for tree species and standard deviation and the Shannon index for tree diameter. The primary results of the study were fourfold: (i) ranges of spatial correlation for diversity indices were small, on the order of 5-10 km, (ii) high proportions of provincewide diversity were realized for circular areas with radii as small as 15 km, (iii) diversity for both species and diameter exhibited strong northwest to southeast spatial patterns, and (iv) plot-level alpha diameter diversity was highly correlated with mean plot-level tree diameter.
引用
收藏
页码:429 / 438
页数:10
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