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Salinity strongly drives the survival, growth, leaf demography, and nutrient partitioning in seedlings of Xylocarpus granatum J. König

Mohammad Raqibul Hasan Siddique (1), Sanjoy Saha (2), Serajis Salekin (1), Hossain Mahmood (1)   

iForest - Biogeosciences and Forestry, Volume 10, Issue 5, Pages 851-856 (2017)
doi: https://doi.org/10.3832/ifor2382-010
Published: Oct 26, 2017 - Copyright © 2017 SISEF

Research Articles


Salinity is increasing in the Sundarbans (Bangladesh) due to sea-level rise and the reduction of fresh water flow. Xylocarpus granatum is one of the most valuable mangrove tree species of the Sundarbans. We conducted a six-month long study to investigate the effect of salinity on the survival, growth, leaf demography, and nutrient partitioning in parts of X. granatum seedlings. Our results showed that most of the seedlings (90%) survived at 0 to 5 PSU salinity, and this survival percentage was found to decrease at higher saline conditions. Salinity of more than 25 PSU was lethal to the plants as no seedlings survived under these conditions. In this salinity (25 PSU), accelerated leaf fall coupled with a reduction in the new leaves caused loss of leaves. The relative growth rate (RGR) was higher at 0 to 5 PSU salinity, and conversely, a lower growth rate was observed with increased salinity. Higher saline conditions created stress, which inhibited nutrient (N, P and K) accumulation in different parts (leaf, stem, bark and root) of the seedlings. We concluded that salinity is a critical factor for the growth and survival of X. granatum either by inhibiting plant nutrient uptake or due to salinity related toxicity.

  Keywords


Mangroves, Climate Change, Leaf Demography, Salinity, Sundarbans, Xylocarpus granatum

Authors’ address

(1)
Mohammad Raqibul Hasan Siddique
Serajis Salekin
Hossain Mahmood
Forestry and Wood Technology Discipline, Khulna University, Khulna 9208 (Bangladesh)
(2)
Sanjoy Saha
Centre for Integrated Studies on the Sundarbans, Khulna University, Khulna 9208 (Bangladesh)

Corresponding author

 
Hossain Mahmood
mahmoodhossain@hotmail.com

Citation

Siddique MRH, Saha S, Salekin S, Mahmood H (2017). Salinity strongly drives the survival, growth, leaf demography, and nutrient partitioning in seedlings of Xylocarpus granatum J. König. iForest 10: 851-856. - doi: 10.3832/ifor2382-010

Academic Editor

Claudia Cocozza

Paper history

Received: Jan 31, 2017
Accepted: Jul 17, 2017

First online: Oct 26, 2017
Publication Date: Oct 31, 2017
Publication Time: 3.37 months

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