Erratum: Alternative method for estimating aboveground net primary productivity applied to balsam fir stands in eastern Canada

2005 ◽  
Vol 35 (12) ◽  
pp. 3027-3028 ◽  
Author(s):  
M B Lavigne ◽  
R J Foster ◽  
G Goodine ◽  
P Y Bernier ◽  
C H Ung
Keyword(s):  
Primary Productivity ◽  
Net Primary Productivity ◽  
Balsam Fir ◽  
Aboveground Net Primary Productivity ◽  
Eastern Canada ◽  
Alternative Method

Alternative method for estimating aboveground net primary productivity applied to balsam fir stands in eastern Canada

2005 ◽  
Vol 35 (5) ◽  
pp. 1193-1201 ◽  
Author(s):  
M B Lavigne ◽  
R J Foster ◽  
G Goodine ◽  
P Y Bernier ◽  
C H Ung
Keyword(s):  
Primary Productivity ◽  
Net Primary Productivity ◽  
Carbon Sink ◽  
Abies Balsamea ◽  
Substantial Effect ◽  
Balsam Fir ◽  
Aboveground Net Primary Productivity ◽  
Eastern Canada ◽  
Cross Sectional ◽  
The Difference

Aboveground net primary productivity (ANPP) was measured in three balsam fir (Abies balsamea (L.) Mill.) forests on a climatic transect extending from southern New Brunswick ("warm" study area) to central Quebec ("cool" study area). Annual foliar production was estimated with a relationship between cross-sectional area at breast height of the current-year annual xylem ring and the mass of current-year foliage, using data obtained by harvesting trees at the beginning of the study. This relationship differed among study areas. Annual branch production was determined from annual foliar production and the ratio of annual branch production to annual foliar production. The ratio of branch to foliar production was estimated from intensive measurement of a sample of branches collected at the end of the study period; it varied among years but was similar for all study areas. ANPP was 3.36 Mg C·ha–1·year–1 at the warm study area, 3.73 Mg C·ha–1· year–1 at the mid-transect study area, and 3.04 Mg C·ha–1·year–1 at the cool study area. These estimates of ANPP were greater than those estimated using a conventional method of summing up increment and litterfall. On average, the conventional estimate of ANPP was 83% of the estimate using relationships described above. Because net ecosystem productivity is the difference between NPP and heterotrophic respiration, a 17% underestimate of NPP can have a substantial effect on the estimate of carbon-sink activity of a forest.

scholarly journals Impact of Extreme Weather Events on Aboveground Net Primary Productivity and Sheep Production in the Magellan Region, Southernmost Chilean Patagonia

Geosciences ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 318
Author(s):  
Pamela Soto-Rogel ◽  
Juan-Carlos Aravena ◽  
Wolfgang Jens-Henrik Meier ◽  
Pamela Gross ◽  
Claudio Pérez ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Net Primary Productivity ◽  
Extreme Weather ◽  
Extreme Weather Events ◽  
Maximum Temperature ◽  
Aboveground Net Primary Productivity ◽  
Weather Events ◽  
Chilean Patagonia ◽  
Magellan Region ◽  
Sheep Production

Spatio-temporal patterns of climatic variability have effects on the environmental conditions of a given land territory and consequently determine the evolution of its productive activities. One of the most direct ways to evaluate this relationship is to measure the condition of the vegetation cover and land-use information. In southernmost South America there is a limited number of long-term studies on these matters, an incomplete network of weather stations and almost no database on ecosystems productivity. In the present work, we characterized the climate variability of the Magellan Region, southernmost Chilean Patagonia, for the last 34 years, studying key variables associated with one of its main economic sectors, sheep production, and evaluating the effect of extreme weather events on ecosystem productivity and sheep production. Our results show a marked multi-decadal character of the climatic variables, with a trend to more arid conditions for the last 8 years, together with an increase in the frequency of extreme weather events. Significant percentages of aboveground net primary productivity (ANPP) variance is explained by high precipitation, mesic temperatures, and low evapotranspiration. These conditions are, however, spatially distributed in the transition zone between deciduous forests and steppe and do not represent a general pattern for the entire region. Strong precipitation and wind velocity negatively affect lamb survival, while temperature and ANPP are positively correlated. The impact of extreme weather events on ANP and sheep production (SP) was in most of the cases significantly negative, with the exception of maximum temperature that correlated with an increase of ANPP, and droughts that showed a non-significant negative trend in ANPP. The examination of these relationships is urgent under the current scenario of climate change with the acceleration of the environmental trends here detected.

Estimating branch production in trembling aspen, Douglas-fir, jack pine, black spruce, and balsam fir

2007 ◽  
Vol 37 (6) ◽  
pp. 1024-1033 ◽  
Author(s):  
P.Y. Bernier ◽  
M.B. Lavigne ◽  
E.H. Hogg ◽  
J.A. Trofymow
Keyword(s):  
Primary Productivity ◽  
Net Primary Productivity ◽  
Black Spruce ◽  
Jack Pine ◽  
Douglas Fir ◽  
Balsam Fir ◽  
Trembling Aspen ◽  
Wood Production ◽  
Conifer Species ◽  
Branch Wood

Measuring net primary productivity of trees requires the measurement of total wood production of branches. Recent work on balsam fir ( Abies balsamea ) has shown that branch-wood production can be estimated as a function of foliage production. We extend the analysis to four other species found in the Canadian forest: black spruce ( Picea mariana ), jack pine ( Pinus banksiana ), Douglas-fir ( Pseudotsuga menziesii ), and trembling aspen ( Populus tremuloides ). Results show that the ratio of annual branch-wood production to annual foliage production is about 1.0 for conifer species (between 0.86 and 1.12) and 0.56 for aspen during a nondrought year. An analysis using field measurements of litterfall and stem-diameter increment from selected forested sites shows that branch-wood production accounts for a smaller proportion of aboveground net primary productivity in trembling aspen (15%–20%) than in conifer species (25%). Also, litterfall capture of small branches (<1 cm diameter) accounts for only 33% of branch detritus production in conifers and 50% in trembling aspen. This study supports the use of an alternative method for estimating branch-wood production that reduces the potential bias in field estimates of net primary productivity.

scholarly journals Aboveground Net Primary Productivity in a Riparian Wetland Following Restoration of Hydrology

Biology ◽  
2016 ◽  
Vol 5 (1) ◽  
pp. 10
Author(s):  
Melissa Koontz ◽  
Christopher Lundberg ◽  
Robert Lane ◽  
John Day ◽  
Reza Pezeshki
Keyword(s):  
Primary Productivity ◽  
Net Primary Productivity ◽  
Aboveground Net Primary Productivity ◽  
Riparian Wetland

Effects of precipitation timing on aboveground net primary productivity in inner mongolia temperate steppe

2013 ◽  
Vol 33 (15) ◽  
pp. 4808-4817 ◽  
Author(s):  
郭群 GUO Qun ◽  
胡中民 HU Zhongmin ◽  
李轩然 LI Xuanran ◽  
李胜功 LI Shenggong
Keyword(s):  
Primary Productivity ◽  
Inner Mongolia ◽  
Net Primary Productivity ◽  
Temperate Steppe ◽  
Aboveground Net Primary Productivity ◽  
Precipitation Timing
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