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Báo cáo khoa học: "Relationship between seasonal cambial activity, development of xylem and phenology in Azadirachta indica growing in different forests of Gujarat State"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Relationship between seasonal cambial activity, development of xylem and phenology in Azadirachta indica growing in different forests of Gujarat State. | Ann. For. Sci. 58 2001 691-698 INRA EDP Sciences 2001 691 Original article Relationship between seasonal cambial activity development of xylem and phenology in Azadirachta indica growing in different forests of Gujarat State Karumanchi S. Raoa and Kishore S. Rajputb Department of Biosciences Sardar Patel University Vallabh Vidyanagar 388 120 India b Department of Biology Christ college P. B. No. 5 Rajkot 360 005 India Received 28 April 2000 accepted 20 April 2001 Abstract - Seasonal cycle of cambial activity was compared among the trees of Azadirachta indica growing in Moist Deciduous MDF Dry Deciduous DDF and Scrub land Forest SF of Gujarat State. Radial growth occurred in two growth flushes in MDF and DDF. Cambial cell divisions in MDF started in February and June resulting maximal radial growth in August-September when the rains were heavy and ceased in January and May during the drier part of the year. In DDF the first flush of growth commenced in January with maximal xylem development in April and ceased in May. The second flush of cambial activity began in June with the arrival of rains reached peak in October and ceased in December. Cambium was active throughout the year in SF and attained its peak activity thrice i.e. in February July and October. With complete maturation of leaves in November the cell divisions were rather slow in MDF and SF whereas no divisions were encountered in DDF. Cambial rays exhibited large intercellular spaces during drier months in all the three forests. Seasonal behavior of vascular cambium was discussed in relation to phenology and local climatic conditions. Azadirachta intercellular spaces vascular cambium xylem Résumé - Relation entre l activite saisonnière du cambium la croissance radiale du xylème et la phénologie chez Azadirachta indica dans différents types d écosystèmes forestiers de l état du Gujarat. Les cycles saisonniers de l activite cambiale chez Azadi-rachta indica dans differents types d écosystèmes forestiers de