不同林龄柠条(Caragana korshinskii)的光合特性和水分利用特征

doi:10.7522/j.issn.1000-694X.2015.00135

摘要/Abstract

摘要： 柠条(Caragana korshinskii)是宁夏沙坡头地区的主要固沙灌木,建植初期表现出较强适应性,但随着年龄增长和土壤水分耗竭,开始出现衰退。为探明灌木年龄与其退化的关系,野外原位测定了不同林龄(3、13、25龄)柠条的叶水势、叶相对含水量、叶表观导水率、净光合速率及水分利用效率,分析了其光合特性与叶水势的关系。结果表明:(1)不同林龄柠条的光合能力和水分利用效率差异显著,中龄、幼龄的光合能力高于老龄,而水分利用效率低于老龄;(2)净光合速率、气孔导度与叶水势的非线性关系,反映出不同林龄柠条采取不同策略应对干旱胁迫,幼龄柠条通过快速关闭气孔来减少水分散失,而中龄和老龄柠条通过调整水分利用策略来应对干旱。老龄柠条通过提高水分利用效率来使水分利用最大化,但其植物水势和光合的降低可能导致生长减缓和衰退。

关键词: 柠条(Caragana korshinskii), 林龄, 光合速率, 水分利用效率

Abstract: Caragana korshinskii is widely used for sand-binding in Shapotou, Ningxia, China. Ii has adapted well to the habitat during the establishment. With the increasing age and the consumption of available soil water, the initially-planted C. korshinskii had degraded. To examine the relationship between the shrub age and the population degradation, we conducted field experiments on different-aged C. korshinskii (25-, 13- and 3-year-old) for the measurements of leaf water potential, leaf relative water content, leaf-specific apparent hydraulic conductance, photosynthetic rate and water use efficiency. We analyzed the relationships between photosynthetic properties and leaf water potential among the different-aged shrubs. The results showed that the photosynthetic capacities of young-mature and juvenile were higher than those of old-growth, while their water use efficiencies were lower compared to old-growth. The nonlinear relationships between both net assimilation rate (A) and stomatal conductance (G_s) with leaf water potential (Ψ) show that different-aged C. korshinskii plants adopt different drought response strategies. Juveniles reduce water loss through closing stomata, while older C. korshinskii plants respond to drought by adjusting WUE. Although the old-growth C. korshinskii maximized water use by increasing the WUE, the decreased photosynthesis and plant water potentials would slow the growth of plants and lead to their degradation.

Key words: Caragana korshinskii, shrub age, photosynthetic rate, water use efficiency

中图分类号:

Q945.79

鲍婧婷, 王进, 苏洁琼. 不同林龄柠条(Caragana korshinskii)的光合特性和水分利用特征[J]. 中国沙漠, 2016, 36(1): 199-205.

Bao Jingting, Wang Jin, Su Jieqiong. Photosynthetic Properties and Water Use Characteristics in Caragana korshinskii in Different Ages[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(1): 199-205.

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