Diurnal dynamics of photosynthetic and transpiration rates of alfalfa under dry farming and their relationships with environmental factors

Abstract

Abstract: In this paper, the diurnal dynamics of photosynthetic rate (P_n) and transpiration rate (T_r) of four years planted alfalfa under dry farming, as well as those of photosynthetic active radiation (PAR), CO₂ concentration in field (C_a), relative humidity (RH) and air temperature (T_a) were measured , and the relationships between the diurnal dynamics of P_n, T_r and climatic factors were analyzed by correlation coefficient, path coefficient, and decision coefficient analyses. The results showed that T_a had the greatest effect on the diurnal dynamics of P_n, while RH, PAR and C_a affected P_n mainly through their acting on T_a. PAR had the greatest effect on the diurnal changes of T_r, and RH, T_a and C_a affected T_rindirectly by acting on PAR. For the characteristics of photosynthesis and transpiration, PAR was the primary determining factor, and T_a was the main limiting factor.

Key words: Winter wheat, Dry matter, Accumulation and distribution, Simulation

LIU Yuhua^1，2; SHI Ji’an^1，2; JIA Zhikuan¹; HAN Qingfang¹. Diurnal dynamics of photosynthetic and transpiration rates of alfalfa under dry farming and their relationships with environmental factors[J]. Chinese Journal of Applied Ecology.

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Diurnal dynamics of photosynthetic and transpiration rates of alfalfa under dry farming and their relationships with environmental factors

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