Tracking leaf area index and coefficient of light extinction over the harvesting cycle of black wattle

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• 作者：Alexandre Behling ; Carlos Roberto Sanquetta…
• 关键词：Leaf area ; Light attenuation ; Tree canopy ; Biomass ; Photosynthetic radiation intercepted
• 刊名：Journal of Forestry Research
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：27
• 期：6
• 页码：1211-1217
• 全文大小：467 KB
• 刊物主题：Forestry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-0607
• 卷排序：27

文摘

The amount of photosynthetic radiation intercepted by a crop is a function of the incident solar radiation on the plants, the leaf area index (L_AI), and the light extinction coefficient (k). We quantified L_AI and k in stands of black wattle (Acacia mearnsii De Wild.) over a 7-year growth cycle at two locations in the state of Rio Grande do Sul, Brazil. Our study was conducted in commercial stands in agroecological regions with high densities of black wattle plantations. L_AI was calculated as the ratio between the leaf area of a tree and its planting space, and k was derived from Beer’s law. L_AI depends on the planting site and stand age. Between the two sites, the L_AI was similar over time, the amount of variation differed. Values of k depended only on stand age, with the highest average observed for stands up to 5 years old. The trend of k during the plantation cycle was inversely proportional to L_AI and was correlated with L_AI, leaf area, leaf dry mass, canopy volume, height, branches dry mass, total dry mass, and crown diameter.