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Light modification in a developing silvopastoral system in the UK: a quantitative analysis

Light modification in a developing silvopastoral system in the UK: a quantitative analysis Transmitted photosynthetically active radiation (PAR) was measured in eight-year-old silvopastoral stands at three different locations in the UK by using PAR sensors randomly distributed between four adjacent trees planted in a square pattern. Two densities (100 stems.ha -1 and 400 stems.ha -1 were compared. The annual carrying capacity (live weight of the animals that a plot supports) was also recorded as an indirect figure of the overall agricultural production of the system. The silvopastoral plots received less radiation than the agricultural plot without trees, the 400 stems.ha -1 treatment being more shaded than the 100 stems.ha -1 . Over the measurement period, on some special days, a maximum of 30% of the incoming radiation was intercepted on the 400 stem.ha -1 treatment with the largest trees. The amount of light intercepted was highly correlated with the type of weather and the leaf area development of the trees: the brighter the day and more expanded the leaf area, the higher was the proportion of radiation intercepted by the tree. However, over the measuring period, a small amount of radiation was intercepted by the tree canopies. As a consequence, no differences were observed in the annual carrying capacity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Agroforestry Systems Springer Journals

Light modification in a developing silvopastoral system in the UK: a quantitative analysis

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References (31)

Publisher
Springer Journals
Copyright
Copyright © 1997 by Kluwer Academic Publishers
Subject
Life Sciences; Agriculture; Forestry
ISSN
0167-4366
eISSN
1572-9680
DOI
10.1023/A:1005916925339
Publisher site
See Article on Publisher Site

Abstract

Transmitted photosynthetically active radiation (PAR) was measured in eight-year-old silvopastoral stands at three different locations in the UK by using PAR sensors randomly distributed between four adjacent trees planted in a square pattern. Two densities (100 stems.ha -1 and 400 stems.ha -1 were compared. The annual carrying capacity (live weight of the animals that a plot supports) was also recorded as an indirect figure of the overall agricultural production of the system. The silvopastoral plots received less radiation than the agricultural plot without trees, the 400 stems.ha -1 treatment being more shaded than the 100 stems.ha -1 . Over the measurement period, on some special days, a maximum of 30% of the incoming radiation was intercepted on the 400 stem.ha -1 treatment with the largest trees. The amount of light intercepted was highly correlated with the type of weather and the leaf area development of the trees: the brighter the day and more expanded the leaf area, the higher was the proportion of radiation intercepted by the tree. However, over the measuring period, a small amount of radiation was intercepted by the tree canopies. As a consequence, no differences were observed in the annual carrying capacity.

Journal

Agroforestry SystemsSpringer Journals

Published: Jun 1, 1997

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