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Tree Biocontent, Net Production and Litter Fall in a Deciduous Woodland

Malcolm K. Hughes
Oikos
Vol. 22, No. 1 (1971), pp. 62-73
Published by: Wiley on behalf of Nordic Society Oikos
DOI: 10.2307/3543363
Stable URL: http://www.jstor.org/stable/3543363
Page Count: 12
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Tree Biocontent, Net Production and Litter Fall in a Deciduous Woodland
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Abstract

1. Energy flow and accumulation in the above ground parts of an alder-birch woodland in County Durham were studied between April 1966 and April 1968. This paper reports data for the tree stratum of the Wynyard woodland. 2. Tree net above ground primary production was 3574 Kcal/ m2/year. 2417 Kcal/ m2/year (68.0%) was wood. 901 Kcal/ m2/year (25.0%) canopy leaves, 232 Kcal/ m2/year (6.4%) other parts, and 24 Kcal/ m2/year (0.6%) loss to herbivores. 3. Tree litter fall was approximately 1450 Kcal/ m2/year in both study years. 66.0% was alder and birch leaves, 19.2% small wood, and 14.3% other litter. Seasonal changes in canopy biomass, biocontent and Leaf Area Index were demonstrated. 4. Total biocontent of tree boles and branches in the 1967-8 winter was 50,912 Kcal/ m2 (10,679.2 g/ m2). 5. Tree litter fall biocontent was close to 40.6% of tree above ground net primary production in both study years, and its ratio to biocontent in the 1967-8 winter was 0.028. /// 1. Исследовали аккумуляцию и поток энергии в надземной части ольховоберезового леса в графстве Дархэм в период с апреля 1966г. по апрель 1968г. В настоящей статье приведены данные для трех ярусов Виньярдского леса. 2. Первичная продукция надземной части древостоя составляет 3574 ккал/ m2/год. 2417 ккал/ m2/год (68%) приходится на древесину, 901 ккал/ m2/год (25%) - на листву, 232 ккал/ m2/год (6,4%) - на другие части и 24 ккал/ m2/год (0,6%) - потери на фитофагов. 3. Листовой опад составляет приблизительно 1450 ккал/ m2/год в оба года, когда проводились исследования. 66% приходится на опад и березы, 19,2% - опад подлеска и 14,3% остальная подстилка. Проведено определение биомассы крон, запаса энергии и индекса площади листы. 4. Общий запас энергии стволов и ветвей деревьев зимой 1967-8гг составлял 50912 ккал/ m2 (10679,2г/ m2). 5. Запас энепгии в листовом опаде примерно 40,6% от первичной продукции надземных ярусов леса в оба года исследования, его отношение к запасу энергии зимой в 1967-8гг - 0,028.

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