Effects of selective tree harvests on aboveground biomass and net primary productivity of a second-growth northern hardwood forest

2010 ◽  
Vol 40 (12) ◽  
pp. 2360-2369 ◽  
Author(s):  
Jacob H. Dyer ◽  
Stith T. Gower ◽  
Jodi A. Forrester ◽  
Craig G. Lorimer ◽  
David J. Mladenoff ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Net Primary Productivity ◽  
Growing Season ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Aboveground Net Primary Productivity ◽  
Transition Zones ◽  
Northern Hardwood ◽  
Growing Seasons ◽  
Second Growth

Restoring structural features of old-growth forests, such as increased canopy gap sizes and coarse woody debris, is a common management goal for second-growth, even-aged stands. We experimentally manipulated forest structure by creating variable-size canopy gaps in a second-growth northern hardwood forest in north-central Wisconsin following two growing seasons of pre-treatment monitoring. The objectives of this study were to quantify the influence of canopy gaps of different sizes (50–380 m2) on aboveground biomass and productivity of each vegetation stratum two growing seasons following treatment. Two years after treatment, ground layer biomass in canopy openings increased significantly relative to surrounding undisturbed transition zones. The response of ground layer biomass was greatest in the large versus the medium and small gaps. Sapling aboveground net primary productivity was significantly greater in undisturbed transition zones than within gaps across gap sizes following the second post-treatment growing season. Annual stem diameter increment was greatest for trees along gap borders and was correlated with crown class, percentage of crown perimeter exposed, gap area, and shade tolerance. Total aboveground net primary productivity was significantly lower in the gap addition plots the first year but by the second post-treatment growing season no longer differed from that in the control plots.

Contribution of atmospheric nitrogen deposition to net primary productivity in a northern hardwood forest

2009 ◽  
Vol 39 (6) ◽  
pp. 1108-1118 ◽  
Author(s):  
Lucas E. Nave ◽  
Christoph S. Vogel ◽  
Christopher M. Gough ◽  
Peter S. Curtis
Keyword(s):  
Primary Productivity ◽  
N Mineralization ◽  
Net Primary Productivity ◽  
Hardwood Forest ◽  
Organic N ◽  
Northern Hardwood Forest ◽  
Net N Mineralization ◽  
Northern Hardwood ◽  
N Supply ◽  
N Requirement

Net primary productivity (NPP) in northern temperate forests is an important part of the global carbon cycle. Because NPP often is limited by nitrogen (N), atmospheric N deposition (Ndep) may increase forest NPP. At a northern hardwood forest site in northern Lower Michigan, USA, we quantified rates of N supply by Ndep, canopy retention of Ndep (Ncr), and soil net N mineralization (Nmin); calculated the N requirement of NPP; and estimated the fraction of NPP that could be attributed to atmospheric N inputs. Net N mineralization supplied 42.6 kg N·ha–1·year–1 (84% of the NPP N requirement), and Ndep averaged 7.5 kg N·ha–1·year–1 (15%). The forest canopy retained 38% of Ndep (Ncr = 2.8 kg N·ha–1·year–1), primarily in the forms of organic N and NH4-N. Fine root (62%) and leaf (31%) N requirements dominated the NPP N requirement of 50.7 kg N·ha–1·year–1. Annual N supply by the processes we measured agreed very closely with the NPP N requirement, suggesting that internally cycled N and N of atmospheric origin contribute to the N nutrition of this forest. Our results indicate that up to 15% of the NPP at this site may be driven by atmospheric N inputs.

Growing‐season warming and winter soil freeze/thaw cycles increase transpiration in a northern hardwood forest

Ecology ◽  
2020 ◽  
Vol 101 (11) ◽  
Author(s):  
Jamie L. Harrison ◽  
Rebecca Sanders‐DeMott ◽  
Andrew B. Reinmann ◽  
Patrick O. Sorensen ◽  
Nathan G. Phillips ◽  
...  
Keyword(s):  
Growing Season ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Northern Hardwood ◽  
Freeze Thaw

scholarly journals Rhizosphere Priming Effects On Soil Extracellular Enzymatic Activity And Microbial Abundance During The Low-Temperature Dormant Season In A Northern Hardwood Forest

2021 ◽  
Author(s):  
Masataka Nakayama ◽  
Ryunosuke Tateno
Keyword(s):  
Low Temperature ◽  
Enzymatic Activity ◽  
Nutrient Uptake ◽  
Growing Season ◽  
Plant Roots ◽  
Hardwood Forest ◽  
Bulk Soil ◽  
Northern Hardwood Forest ◽  
Northern Hardwood ◽  
Dormant Season

Abstract PurposePlant roots alter nutrient cycling within the soil surrounding them (rhizosphere). Recent studies have focused on nutrient uptake by plants in low-temperature seasons. This study aimed to reveal the nutrient dynamics in rhizosphere during low-temperature seasons in a northern hardwood forest in Japan.MethodsThe potential extracellular enzymatic activity, bacterial, fungal, and archaeal abundances, and soil chemical properties in the rhizosphere of canopy trees and understory vegetation and non-rhizosphere bulk soil were measured at the beginning of the dormant season (November), end of the dormant season (April and May), and middle of the growing season (August) in a northern hardwood forest in Japan.ResultsThe abundance of fungi and the activity of nitrogen- and phosphorus-degrading enzymes were higher in the rhizosphere than in non-rhizosphere bulk soil regardless of the season. The concentration of extractable organic and inorganic N was higher in the rhizosphere than in the non-rhizosphere bulk soil at the beginning and end of the dormant season, but this trend was not observed in the middle of the growing season. ConclusionSince the concentration of nutrients in the rhizosphere is determined by the balance between nutrient uptake by fine roots and root-induced acceleration of decomposition, our results suggest that plant roots would accelerate N and P cycles during the dormant season, even though the amount of nutrient uptake by plants was lower during the season.

Early Revegetation and Nutrient Dynamics Following the 1971 Little Sioux Forest Fire in Northeastern Minnesota

1979 ◽  
Vol 25 (suppl_1) ◽  
pp. a0001-z0001
Author(s):  
Lewis F. Ohmann ◽  
David F. Grigal
Keyword(s):  
Plant Communities ◽  
Primary Productivity ◽  
Forest Floor ◽  
Pinus Banksiana ◽  
Nutrient Dynamics ◽  
Net Primary Productivity ◽  
Growing Season ◽  
Shrub Cover ◽  
Growing Seasons ◽  
Tall Shrub

Abstract Three virgin plant communities dominated by Pinus banksiana, three by Populus-Betula, and one mixed community were studied over five growing seasons after burning in the 1971 Little Sioux Fire. From 1971 through 1975 tree and tall shrub reproduction generally decreased in density and increased in biomass. Low shrub cover and biomass increased for 3 years and then leveled off as tree and tall shrub competition increased. Herb cover and biomass increased most rapidly through 1972 and then slowed substantially. By 1975 total net primary productivity averaged 850 g/m²/yr for all seven stands, and over 1,200 g/m²/yr in the broadleaf-dominated stands. The forest floor 01 horizon increased in mass through 1974, and then apparently stabilized at about 620 g/m². The 02 horizon averaged about 1,000 g/m² and was still increasing in 1975. By the 1975 growing season the total amount of nutrients in aboveground vegetation on burned plots ranged from 33 percent of the N to 65 percent of the K found in nearby unburned forest communities. By 1973 the nutrients in the aboveground vegetation and the 01 horizon of the forest floor were greater than the quantity estimated to have been mobilized by the fire. The vegetation was an effective sink for the released nutrients.

Growing season soil warming may counteract trend of nitrogen oligotrophication in a northern hardwood forest

2020 ◽  
Vol 151 (2-3) ◽  
pp. 139-152
Author(s):  
Jamie L. Harrison ◽  
Kyle Schultz ◽  
Megan Blagden ◽  
Rebecca Sanders-DeMott ◽  
Pamela H. Templer
Keyword(s):  
Growing Season ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Soil Warming ◽  
Northern Hardwood

scholarly journals The Change in Environmental Variables Linked to Climate Change Has a Stronger Effect on Aboveground Net Primary Productivity Than Does Phenological Change in Alpine Grasslands

2022 ◽  
Vol 12 ◽  
Author(s):  
Jiangwei Wang ◽  
Meng Li ◽  
Chengqun Yu ◽  
Gang Fu
Keyword(s):  
Climate Change ◽  
Tibetan Plateau ◽  
Carbon Cycling ◽  
Primary Productivity ◽  
Environmental Variables ◽  
Net Primary Productivity ◽  
Growing Season ◽  
The Tibetan Plateau ◽  
Aboveground Net Primary Productivity ◽  
Alpine Grasslands

More and more studies have focused on responses of ecosystem carbon cycling to climate change and phenological change, and aboveground net primary productivity (ANPP) is a primary component of global carbon cycling. However, it remains unclear whether the climate change or the phenological change has stronger effects on ANPP. In this study, we compared the effects of phenological change and climate change on ANPP during 2000–2013 across 36 alpine grassland sites on the Tibetan Plateau. Our results indicated that ANPP showed a positive relationship with plant phenology such as prolonged length of growing season and advanced start of growing season, and environmental variables such as growing season precipitation (GSP), actual vapor pressure (Ea), relative humidity (RH), and the ratio of GSP to ≥5°C accumulated temperature (GSP/AccT), respectively. The linear change trend of ANPP increased with that of GSP, Ea, RH, and GSP/AccT rather than phenology variables. Interestingly, GSP had the closer correlation with ANPP and meanwhile the linear slope of GSP had the closer correlation with that of ANPP among all the concerned variables. Therefore, climate change, mainly attributed to precipitation change, had a stronger effect on ANPP than did phenological change in alpine grasslands on the Tibetan Plateau.

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