极端干旱区自然环境下胡杨幼株对土壤渐进式干旱的生理响应

doi:10.11707/j.1001-7488.20131124

Abstract

Abstract:

A pot experiment in the outdoor was conducted to investigate the effect of soil progressive drought on the physiological parameters of 2-year-old Populus euphratica seedlings in the lower reach of Tarim River. The seedlings were respectively grown under well-watered and progressive water deficit conditions by controlling the water supply. Chlorophyll fluorescence parameters of actual photochemical quantum yield of PSII in the light (φ_PSII), photochemical quenching index (q_p) and non-photochemical quenching index (q_N), leaf stomatal conductance (G_s) and predawn water potential were measured during the experiment period. Results showed that the soil moisture content decreased to mild drought stress level in 6 days after a saturated irrigation, and reached to severe drought stress level in 15 days after a saturated irrigation in July. During the drying process of soil water content, the increasing soil drought resulted in decreases in the predawn leaf water potential at 6:00 am, φ_PSII, q_p and G_s of the seedlings, but increase in q_N. These results would provide a scientific foundation for understanding drought resistant mechanism of P. euphratica seedlings.

Key words: arid area, water, physiology, Populus euphratica

CLC Number:

S718.3

Yang Yuhai, Li Weihong, Chen Yaning, Zhu Chenggang, Ma Jianxin. Physiological Response of Populus euphratica Seedlings to Progressive Soil Drought Under Natural Environment in an Extreme Arid Area[J]. Scientia Silvae Sinicae, 2013, 49(11): 171-176.

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Physiological Response of Populus euphratica Seedlings to Progressive Soil Drought Under Natural Environment in an Extreme Arid Area

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