Growth and dry matter allocation of three tropical tree species seedlings under different soil moisture conditions

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  • 異なる土壌水分条件における熱帯産3樹種の実生稚樹の成長と物質分配

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Abstract

We investigated the responses of growth and dry matter partitioning of seedlings of Cedrela odorata (west Indian cedar), Swietenia macrophylla (Honduras mahogany) and Schizolobium parahybum (quamwood) to different soil water regimes: water deficit, wet and moderate. All species showed the maximum growths in height, diameter at root collar, leaf area, and total dry weight in the moderate condition. Relative growth rate (RGR) in the water deficit and the wet conditions for all species declined compared to those in the moderate condition. For S. macrophylla and S. parahybum, the degree of decline was greater in the water deficit condition. Decreases in the net assimilation rate (NAR) in the water dificit and the wet conditions were same level. Leaf area ratio (LAR) decreased in the water dificit condition for S. Macrophylla, and increased in the wet condition for S. parahybum. Thus, larger decline of dry matter allocation to leaves in the water deficit condition compared to those in the wet condition might relate to the severer dicline of RGRs. For C. odorata, the decline of RGR was severer in the wet condition in contrast to other two species. NAR slightly increased in the wet condition, and slightly decreased in the water deficit condition. LAR decreased in both wet and water deficit conditions, with a larger decline in the wet. The severe decline of RGR in the wet condition compared to those in the water deficit condition might result from the largely declined dry matter allocation to leaves.

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