Abstract
Understating of the water availability and its corresponding use by Mallotusphilippensis and its control by climatic factors can give an idea about the ecosystem interaction. The sap flow measurement taken in M. philippensis during 2014 in Barkot forest showed that,the sap flow rate varied with time of day and season and also with radial depth of the tree trunk. The average daily sap flow rate was found to be 11.5 ± 1.7 cm h-1. Month-wise daily sap flow rate ranged between 4.4 to 10.6 cm h-1in outer portion of the trunk and 12.7 to 17.7cm h-1 in the inner portion of the trunk. Night-time sap flow contributed about 44 per cent of the total annual sap flow. Relative humidity was found to have slightly higher effect on diurnal sap flow rate than air temperature. Monthly sap flow was found to be a function of air temperature. The sap flow rate obtained during this study will be used in augmenting carbon flux studies being carried out in Barkot Flux site (BFS) and can be used in development of canopy conductance and stand transpiration models and validations.
Highlights
sap flow rate at 27.5 mm (Sap) flow measurements provide a powerful tool for quantifying plant water use and monitoring qualitative physiological responses of plants to environmental conditions
Diurnal sap flow rate closely followed the course of sun during day
Averaged (SapAvg, average value of SapIn and SapOut) daily maximum sap flow velocity was found in the month of September with 14.1 cm h-1and minimum was in the month of January with a flow rate of 8.5 cm h-1
Summary
Sap flow measurements provide a powerful tool for quantifying plant water use and monitoring qualitative physiological responses of plants to environmental conditions. Accurate estimates of whole-tree water use can help in estimation of catchment-level transpiration and for understanding the contribution of trees to total ecosystem transpiration. Sap flow studies are widely used in validating and comparing the ecosystem level estimates of water use, modelling canopy conductance and stand transpiration (Granier and Breda, 1996; Wang et al, 2014). Studies on sap flow for several tree species have been carried out in different regions of the world from India there are few (Annamalainathan et al, 2013). The main objectives of the present study was to quantify and understand temporal variation in sap flow rate of M. philippensisand its climatic control in Barkot forest
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