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[1]GONG Yu-xia,HE Kang-ning.Responses of Gas Exchange Parameters of Acer truncatum to Soil Water Varivation in a Semi-arid Region of the Loess Plateau[J].Research of Soil and Water Conservation,2007,14(01):242-245.

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Responses of Gas Exchange Parameters of Acer truncatum to Soil Water Varivation in a Semi-arid Region of the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 14 Number of periods: 2007年01期 Page number: 242-245 Column: Public date: 1900-01-01

Title:: Responses of Gas Exchange Parameters of Acer truncatum to Soil Water Varivation in a Semi-arid Region of the Loess Plateau

Author(s):: GONG Yu-xia¹, HE Kang-ning²; College of Soil and Water Conservation, Beijing Foresty University, Beijing 100083, China

Keywords:: Acer truncatum; net photosynthetic rate; transpiration rate; water use efficiency; soil water content

CLC:: S152.7

DOI:: -

Abstract:: Using a portable Li-6400 photosynthesis system and a TDR moisture meter, the physio-ecology characters of three-year-old spotted Acer truncatums under different soil water contents (SWC) was observed in a semi-arid region of the Loess Plateau. And the responses processes of some parameters to SWC were studied, including net photosynthetic rate, transpiration rate, water use efficiency (WUE), stomatal conductance, intercellular CO₂ concentration and stomatal limiting value, and the effects of soil water stress on the photosynthesis and the fitting range of SWC of Acer truncatum were explored and got. The result showed that the optimum SWC keeping the highest net photosynthetic rate and transpiration rate of Acer truncatum was 14% and 15%, the best SWC to support the highest WUE was 12.8% and 8% of SWC was the turning point of the two factor, which lead to the decrease of net photosynthetic rate from stomatal limitation to non-stomatal limitation under severe water stress. According to the main intention of soil water management for enhancing WUE, it was concluded that the suitable range of SWC of Acer truncatum was within a range of 11%～15%.

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Last Update: 1900-01-01