应用生态学报2013，Vol.24Issue(2)：359-365,7.
盐碱胁迫下沙地彰武松和樟子松苗木生理特性
Physiological characteristics of Pinus densiflora var.zhangwuensis and Pinus sylvestris var.mongolica seedlings on sandy lands under salt-alkali stresses
摘要
Abstract
For the popularization of Pinus densiflora var. zhangwuensis, a new afforestation tree species on the desertified and salinized-alkalized lands in Northern China, and to evaluate the salinity-alkalinity tolerance of the tree species and to better understand the tolerance mechanisms, a pot experiment with 4-year old P. densiflora var. zhangwuensis and P. sylvestris var. mongolica was conducted to study their seedlings growth and physiological and biochemical indices under the effects of three types salt (NaCl, Na2CO3, and NaHCO3) stresses and of alkali (NaOH) stress. Under the salt-alkali stresses-, the injury level of P. densiflora var. zhangwuensis was lower, and the root tolerance index was higher. The leaf catalase ( CAT) activity increased significantly by 22. 6 times at the most, as compared with the control; the leaf malondialdehyde ( MDA) content had no significant increase; the leaf chlorophyll (Chl) content had a smaller decrement; and the leaf water content (LWC) increased slightly. P. sylvestris var. mongolica responded differently to the salt-alkali stresses. Its leaf CAT activity had less change, MDA content increased significantly, Chi content had significant decrease, and LWC decreased slightly. It was suggested that P. densiflora var. zhangwuensis had a greater salinity-alkalinity tolerance than P. sylvestris var. mongolica. The higher iron concentration in P. densiflora var. zhangwuensis needles enhanced the CAT activity and Chi content, whereas the higher concentrations of zinc and copper were associated with the stronger salinity-alkalinity tolerance.关键词
彰武松/樟子松/盐碱胁迫/生理指标Key words
Pinus densiflora var. zhangwuensis/ Pinus sylvestris var. mongolica/ salt-alkali stress/physiological indices分类
农业科技引用本文复制引用
孟鹏,李玉灵,张柏习..盐碱胁迫下沙地彰武松和樟子松苗木生理特性[J].应用生态学报,2013,24(2):359-365,7.基金项目
国家林业局"948"项目(2009-4-29)、林业公益性行业科研专项(201004023,201104104)和辽宁省农业科技重点计划项目(2011207002,2011207004)资助. （2009-4-29）
