祁连山水源区主要树种耐旱性研究

摘要/Abstract

摘要： 应用P-V技术对祁连山水源涵养林主要树种水分参数进行测定分析.结果表明,不同水分参数在树种上的变化规律各异,反映了植物耐旱机理的复杂性;对10项水分参数的主成分分析结果显示,以|φπ₁₀₀-φπ₀ |、RCV、ROWC₀和ε_max分析植物的耐旱性能具有可靠性.用两种几何数学方法的分析结果表明,按照耐旱性大小可将供试树种分为耐旱性强树种(青海云杉和千里香杜鹃)、耐旱性较强树种(祁连圆柏、烈香杜鹃、头花杜鹃和青海杜鹃)、耐旱性较弱树种(金露梅、绣线菊和红桦)和耐旱性弱树种(青杨).苗木清晨叶水势与土壤含水率间变化趋势可以用双曲线方程、幂函数式(或指数函数式)取得满意的拟合.通过逐步聚类分析,按照树种主要耐旱机理可分为高水势延迟脱水耐旱树种(红桦和青海杜鹃)、亚高水势延迟脱水型树种(青海云杉、千里香杜鹃和头花杜鹃)、亚低水势忍耐脱水耐旱树种(祁连圆柏)与低水势忍耐脱水型耐旱树种(金露梅、绣线菊和烈香杜鹃).

关键词: 祁连山, 水源区, 耐旱, 水分参数

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

中图分类号:

Q945.79

党宏忠, 周泽福, 赵雨森. 祁连山水源区主要树种耐旱性研究[J]. 应用生态学报, 2005, 16(12): 2241-2247.

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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