Light response curves of photosynthesis of important tree species in Caatinga vegetation, North-East Brazil

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  • ブラジル北東部の Caatinga 植生における主要樹種の光‐光合成曲線
  • ブラジル東北部のCaatinga植生における主要樹種の光-光合成曲線
  • ブラジル トウホクブ ノ Caatingaショクセイ ニ オケル シュヨウジュシュ ノ ヒカリ コウゴウセイ キョクセン

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Abstract

In this study, photosynthetic characteristics and water use efficiency through the light response curve of Caatinga trees were examined and their growing situation on local environment was discussed. Jurema preta showed a highest maximum net photosynthetic rate and high light compensation point. It is considered that Jurema preta play one of the pioneer plant. There was no significant difference between Algaloba and Jurema preta in terms of maximum net photosynthetic rate and water use efficiency. Catingueira showed a lower maximum net photosynthetic rate. However, Catingueira exhibited a lower light compensation point than Jurema preta. It is considered that on the succession process, Jurema preta plays a leading role and dominant in the early stage. Following Jurema preta, Catingueira became dominant. Pinao bravo showed lower water use efficiency than Jurema preta. It's considered that Jurema preta become dominant following Pinao bravo when Caatinga vegetation was damaged by the drought. Considering the revegetation plan for recuperation and preservation of Caatinga vegetation, it seems to be better use the dominant species in the later stage such as Catingueira. On the other hand, for reproduction, it would be better to use the species that exhibit high photosynthetic rate, such as Jurema preta.

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