Two-decadal trends in aboveground litterfall and net primary production in self-thinning Pinus banksiana stands in Wood Buffalo National Park,NWT, Canada |
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| Authors: | Nahoko Kurachi Tomiyasu Miyaura Jumpei Toriyama Yojiro Matsuura Akira Osawa |
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| Affiliation: | 1. Hiraoka Forest Institute, Otsu, Japan;2. Faculty of Science and Technology, Ryukoku University, Otsu, Japan;3. Kyushu Research Center, Forestry and Forest Products Research Institute, Kumamoto, Japan;4. Forestry and Forest Products Research Institute, Tsukuba, Japan;5. Graduate School of Global Environmental Studies, and Graduate School of Agriculture, Kyoto University, Kyoto, Japan |
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| Abstract: | We estimated the aboveground net primary production (ANPP) in five self-thinning jack pine (Pinus banksiana) stands in Wood Buffalo National Park, NWT, Canada. The stands (11 to ca.175 years old) were selected to examine the relationship between stand density and tree size and its effect on carbon dynamics. Aboveground litterfall was collected from each stand from 1997 to 2012. Stand biomass was estimated by measuring tree size every 5 years and estimating the individual mass using allometric relationships. ANPP was then estimated by summing the litterfall mass, dead stem mass increment and stand biomass increment. We determined the proportional contribution of each organ to the total litter and the seasonal pattern of needle litterfall. There was a lower turnover rate of aboveground biomass in older stands than younger stands. The ANPP increased in the youngest stand (<30 years old) showed a decreasing trend in stands >50 years old. The maximum ANPP was estimated to be ca. 500?g m?2 year?1 in dry matter, which was found in 30–50 year-old stands. |
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| Keywords: | Jack pine litterfall biomass aboveground net primary production soil CN ratio self-thinning line |
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