Journal of Food, Agriculture and Environment

Sap flow response of afforestation species Populus bolleana Lauche and Pinus sylvestris var. mongolica to environmental factors in North-West China

Author(s):

Jifeng Deng, Guodong Ding *, Yuanyuan Zhao, Xinxing Wang

Recieved Date: 2013-07-22, Accepted Date: 2013-10-18

Abstract:

This study was designed to obtain the diurnal and seasonal changes of sap flow in Populus bolleana Lauche and Pinus sylvestris var. mongolica species so as to understand its water requirement and ecological significance. The thermal diffusion method and stem heat balance techniques were applied and meteorological factors were monitored at a flux tower during May-October 2011. The results showed that diurnal variation of sap flow fluctuation was transitionally changing in the growing season, adjusting to its way of water consumption. Sap flow of two species varied greatly under different weather, which reflected the dynamic of water absorption diverse. There was linear correlation between sap flow rate of Populus bolleana Lauche and reference evapotranspiration. Redundancy and Kendall’s tau analysis indicated air temperature, net radiation and vapour pressure deficit had great influence on sap flow of Populus bolleana Lauche, dominant environmental variables influencing sap flow were soil heat fluxPopulus bolleana Lauche could be described by a multiple linear regression against the meteorological variables and the simulated value was significantly linearly correlated. The vertical distribution of soil moisture content was observed throughout the whole growing season. There was a highly linear relationship between sap flow rate to reference evapotranspiration and the amount of soil water in Pinus sylvestris var. mongolica woodland. In the 0.1-0.2 m soil layer contributed to most of the plant transpiration as the highest coefficient of determination at this layer. In the semi-arid district afforestation was limited to air mean temperature, net radiation, vapour pressure deficit and top soil moisture factors.

Keywords:

Populus bolleana Lauche, Pinus sylvestris var. mongolica, sap flow, meteorological factor, redundancy analysis

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2605-2612

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