Dear Mehreen Peerally,

this is a very interesting question and extensive experimental and modeling work has been done  to estimate mangroves response to changes in those factors.

• pH. The pH could affect the plant growth, but for the normal range of variation should not be a limiting factor.
• Salinity. Salinity is usually the main cause of abiotic stress. High salinity generally limits growth. However, growth rate as a function of salinity displays a peculiar pattern in mangroves: growth rate is maximum at an intermediate value of salinity and is lower in more fresh or more saline conditions.
• Temperature. The mangrove growth depends on the temperature (ambient temperature) in a way that is maximum in a optimal temperature and decreases for higher or lower temperature.
• Sea level rise. The sea level rise can influence the growth in the sense that it can cause permanent anoxic conditions at the root level and, consequently, death. 
• Nutrient availability. Nutrients scarcity, in particular of N and P, are cause of biotic stress and mangroves generally use a considerable amount of nutrients because of their energetic expensive metabolism. 

I am working on the ecohydrology of mangroves and I studied their response to changes in the main environmental conditions.

The ones above are general considerations. Please don't hesitate to contact me for more information.

For further references regarding the effects of salinity on halophytes please see the following papers:

Article Plant Osmoregulation as an Emergent Water-Saving Adaptation

Article Salinity and periodic inundation controls on the soil-plant-...

Best regards,

Saverio

Dear Mehreen

In addition to above answer by Saverio, I would suggest you to go through some review articles by Prof. Kathiresan and Prof. Alongi.

Please follow the links for more details:

http://link.springer.com/article/10.1007/s40641-015-0002-x

http://www.sciencedirect.com/science/article/pii/S0065288101400034

Thank you

 salinity is  one of the important factors  for the growth and development  of mangroves, I have seen the stunted  mangroves in some estuaries where fresh input is low and it leads higher salinity levels.Besides, soil composition ( sand, silt and clay ratios)  also important parameter for proper development of the mangroves.

The various abiotic factor such as pH, Salinity, Temperature, Sea level rise and Nutrient availability associated with influence on rich diversity and deforestation of mangroves. Because, mangroves are abiotic and biotic specific.

Salinity causes dwarfness - confirmed by 100s of researchers