scholarly journals Songbird response to group selection harvests and clearcuts in a New Hampshire northern hardwood forest

2000 ◽  
Vol 127 (1-3) ◽  
pp. 41-54 ◽  
Author(s):  
Christine A Costello ◽  
Mariko Yamasaki ◽  
Peter J Pekins ◽  
William B Leak ◽  
Christopher D Neefus
Keyword(s):  
New Hampshire ◽  
Group Selection ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Northern Hardwood

Comparing line-intersect, fixed-area, and point relascope sampling for dead and downed coarse woody material in a managed northern hardwood forest

2004 ◽  
Vol 34 (8) ◽  
pp. 1766-1775 ◽  
Author(s):  
G J Jordan ◽  
M J Ducey ◽  
J H Gove
Keyword(s):  
New Hampshire ◽  
Field Trial ◽  
The Other ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Sampling Efficiency ◽  
Time Efficiency ◽  
Northern Hardwood ◽  
Fixed Area ◽  
Coarse Woody Material

We present the results of a timed field trial comparing the bias characteristics and relative sampling efficiency of line-intersect, fixed-area, and point relascope sampling for downed coarse woody material. Seven stands in a managed northern hardwood forest in New Hampshire were inventoried. Significant differences were found among estimates in some stands, indicating a potential for difference in bias in field implementation of the methods. In terms of relative sampling efficiency, results for each method varied among stand. However, point relascope sampling had comparable or better time efficiency than the other methods in most stands.

Is nest predation density dependent? A test using artificial nests

1992 ◽  
Vol 70 (12) ◽  
pp. 2498-2500 ◽  
Author(s):  
Leonard Reitsma
Keyword(s):  
New Hampshire ◽  
Nest Predation ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Nest Density ◽  
Artificial Nests ◽  
Density Dependent ◽  
Northern Hardwood ◽  
Significant Difference ◽  
Natural Nest

Experiments using artificial nests to test whether predation varies with nest density were conducted in a northern hardwood forest in New Hampshire in June 1989. Nests were baited with quail eggs and placed at densities similar to and substantially higher than the range of natural nest densities. There was no statistically significant difference in predation levels among densities, but there was a trend for higher predation at the highest density.

Ground-layer response to group selection with legacy-tree retention in a managed northern hardwood forest

2007 ◽  
Vol 37 (10) ◽  
pp. 1797-1807 ◽  
Author(s):  
Joshua M. Shields ◽  
Christopher R. Webster
Keyword(s):  
Group Selection ◽  
Tree Height ◽  
Rubus Idaeus ◽  
Ground Layer ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Upper Peninsula ◽  
Northern Hardwood ◽  
Tree Retention ◽  
The Matrix

We examined the effects of group selection with legacy-tree retention on ground-layer or understory diversity and composition in an uneven-aged northern hardwood forest in the Upper Peninsula of Michigan. We sampled 20 reference plots in the surrounding forest matrix and 49 openings with radii of 0.5 (n = 16), 0.75 (n = 17), and 1.0 (n = 16) times mean canopy tree height (22 m). Resultant opening areas were 321 ± 16 (mean ± SEs), 697 ± 21, and 1256 ± 39 m2, respectively. Each opening contained a centrally located legacy tree. Two years after harvesting, ground-layer diversity was significantly higher in openings than on reference plots (p < 0.05) because of an influx of early seral, wetland, and weedy exotic species. The importance of aggressive ruderals (i.e., Carex ormostachya Wieg. and Rubus idaeus subsp. strigosus (Michx.) Focke) increased significantly (p < 0.001) with increasing opening area. Although the importance and cover of several late-seral species were lower in openings compared with the forest matrix, few species found in the matrix were wholly absent from the openings. These results suggest that ground-layer plant communities in managed northern hardwood forests may display a high degree of resilience to intermediate-intensity disturbances.

Soil seed bank dynamics of pin cherry in a northern hardwood forest, New Hampshire, U.S.A.

1998 ◽  
Vol 28 (10) ◽  
pp. 1471-1480 ◽  
Author(s):  
Geraldine L Tierney ◽  
Timothy J Fahey
Keyword(s):  
New Hampshire ◽  
Seed Bank ◽  
Large Scale ◽  
Community Dynamics ◽  
Soil Seed Bank ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Northern Hardwood ◽  
Seed Bank Dynamics ◽  
Large Scale Disturbance

The soil seed bank of the low-value, pioneer tree pin cherry (Prunus pensylvanica L.f.) appears to increase markedly after multiple, large-scale disturbance events, which may result in interference with the growth of high-value species. Seven northern hardwood forest sites of varying age and disturbance history in the White Mountains of New Hampshire were examined to quantify the patterns of accumulation and depletion of the pin cherry soil seed bank. The pin cherry seed bank accumulated in a predictable fashion based on pin cherry stem abundance. High- and low-density populations accumulated approximately 440 and 1900 viable seeds per pin cherry stem, respectively. Depletion of the seed bank appeared to be negligible in stands between age 40 and 60, and moderate (30% loss over 20 years) in stands between age 95 and 115. Short (e.g., 60-year) harvest rotation times may triple the size of the pin cherry soil seed bank, causing proliferation of this species with consequences for ecosystem and community dynamics, whereas longer rotation times of 120 years may allow enough depletion of the seed bank to stabilize population sizes.

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