Issue 4, December 2000

Screening of nine multipurpose tree species were studied to different salinity levels with a view to find out the tolerant species. Based on the visual scoring on injury symptoms and height growth, the tested tree species were classified into highly, moderately and less tolerant species. Casuarina equisetifolia withstood > 500 mM. concentration of salt solution and was rated as highly tolerant tree species while Acacia nilotica and Acacia auriculiformis as moderately tolerant species (400-500 mM). Casuarina equisetifolia recorded the minumum percentage of growth reduction over control. The tolerant species grown even under higher salt concentration while the less tolerant species ceased to grow above 300 mM.

Detailed information on distribution of mangroves based on ground truth is one of the most important and crucial information required for drawing management plan for effective conservation of mangrove ecosystem. This information enables us to adapt appropriate strategy and action plan not only for the conservation but also for the development of the mangrove ecosystem. Based on the field realities artificial regeneration of mangroves can be taken up on various degraded sites for its quick restoration. Timely action can also be taken to multiply those species which are threatened or on the verge of extinction. Wherever feasible new mangrove species can be introduced after experimental trials in order to enrich the area. In addition to several other utilities, the information on distribution of mangroves can play a significant role in proper planning for sustainable utilisation of mangrove wood. Mangroves occur all along the seven estuaries and Cumbarjua canal in Goa. Details of intensive and extensive field study on species-wise distribution of mangroves in Goa along with other useful information have been presented in this paper.

Acacia senegal is an exotic species and grows well in arid and semi-arid regions. The present investigation deals with the cycling of minerals in Acacia senegal (L.) Willd. In reserved forest near Bhavnagar, India.