Drought resistibility of main tree species in water conservation forest of Qilian Moutains

Abstract

Abstract: With P-V techniques,this paper determined and analyzed the water parameters of main tree species in the water conservation forest of Qilian Moutains.The results showed that the test water parameters varied with tree species,reflecting the complicacy of the drought-resistance mechanism of trees.Among 10 parameters,|φπ₁₀₀ -φπ₀ |,RCV,ROWC₀ and ε_max could reflect most information of drought resistibility.Based on their drought resistibility,the test tree species could be classified into 4 groups,i.e.,high drought resistibility(Picea crassifolia and Rhododendron thymifolium),sub-high drought resistibility(Sabina przewalskii,Rhododendron anthopogonoides,Rhododendron capitatum and Rhododendron przewalskii),low drought resistibility(Populus cathyana),and inferior drought resistibility(Potentilla fruticosa,Spiraea salicifoliaand Betula albosinensis).The relationships between predawn leaf water potential and soil water content could be well modeled by hyperbola function,power function or exponent function.Meanwhile,the test tree species could be also grouped as high potential delay dehydration species (Betula albosinensis and Rhododendron przewalskii),sub-high potential delay dehydration species(Picea crassifolia,Rhododendron thymifolium and Rhododendron capitatum),inferior potential tolerance species(Sabina przewalskii),and low potential tolerance species(Potentilla fruticosa,Spiraea salicifolia and Rhododendron anthopogonoides),based on their drought-resistance mechanism.

Key words: Qilian Moutains, Water source area, Drought resistibility, Water parameters

CLC Number:

Q945.79

DANG Hongzhong, ZHOU Zefu, ZHAO Yusen . Drought resistibility of main tree species in water conservation forest of Qilian Moutains[J]. Chinese Journal of Applied Ecology, 2005, 16(12): 2241-2247.

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