关键词: 策勒绿洲, 多年生植物, 清晨水势, 茎流量, 水分利用效率, 刀鲚, 生长参数, 死亡参数, Beverton-Holt模型, 淀山湖

Abstract: The water physiological characteristics of four perennial plant species (Populus euphratica, Tamarix ramosissima, Calligonum caputmedusae, and Alhagi sparsifolia) around Cele Oasis in Xinjiang were studied through their vegetation growth period. No signs of serious drought stress were observed in any of the test perennial species during their vegetation growth, and irrigation had little effects on the water status of the plants (P＞0.05). The seasonal variation characteristics of water physiological parameters differed with the plants. A. sparsifolia had the highest predawn water potential (PWP) and daily mean sap flow, but the lowest mean water use efficiency (WUE); C. caputmedusae had the highest mean WUE, and its PWP and sap flow were stable and had less seasonal change; T. ramosissima had the lowest PWP during its growth, and had better adaptation ability to the environment; and P. euphratica had relatively stable water physiological characteristics during its growth. The four perennial plant species had deep root systems to access underground water to satisfy their large demands for water, and thus, well adapted to the harsh environmental conditions around Cele Oasis. 

Key words: Cele oasis, perennial plants, predawn water potential, sap flow, water use efficiency, Coilia nasustaihuensis, growth parameters, mortality parameters, Beverton-Holt model, Dianshan Lake.