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旱胁迫条件下3树种幼苗光合特性比较研究 被引量:10

Effects of Soil Water Stress on Photosynthetic Characteristics of Three Native Tree Species Seedlings
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摘要 模拟石漠化山区土壤水分变化特征对滇楸、任豆和银荆当年实生幼苗的光合特性以及生理生态适应机制进行对比研究.研究结果表明,在CK,T1,T2,T34个不同处理组,3树种幼苗的净光合速率Pn、蒸腾速率Tr、表观光能利用效率LUE和表观CO2利用效率CUE的平均值均呈显著差异,其平均值的大小顺序为:银荆>任豆>滇楸,且各指标随着土壤含水量的减少而降低.在CK组,3树种幼苗的水分利用效率WUE的平均值均无显著差异,但在T2组银荆幼苗WUE显著高于任豆和滇楸.在4个不同处理组内,滇楸幼苗的气孔导度Gs显著高于任豆和银荆幼苗. The photosynthetic characteristics of Zeni insignis, fargesii vat. duclouxii and Acacia dealbara seedlings were compared under four water treatments for plant selection to revegetate in the Rocky Desertification Area. The results were as follows:In CK, Treatment 1 (T1), Treatment 2 (T2) and Treatment 3 (T3), the three tree species showed significant differences in net photosynthetic rate (Pn), transpiration rate (Tr), apparent light use efficiency (LUEapp) and apparent CO2 use efficiency (CUE- app), whose averages appeared in the order of A. dealbara〉Z. insignis〉fargesii var. duclouxii. All the indexes declined with soil water content. In CK, the three species didn't differ in water use efficiency (WUE). In T2, however, the WUE of A. dealbara was higher than that of Z. insignis and fargesii var. duclouxii. In the four water treatments, the Gs of fargesii var. duclouxii was higheer than that of either A. dealbara or Z. insignis.
出处 《西南大学学报(自然科学版)》 CAS CSCD 北大核心 2007年第5期168-172,共5页 Journal of Southwest University(Natural Science Edition)
基金 国家林业局重点项目"石漠化地区植被恢复与生态重建技术试验示范"(2003053L53) 国家林业重点工程科技支撑项目"喀斯特石漠化地区植被恢复与重建技术研究"
关键词 石漠化山区 土壤水分 乡土树种 光合特性 Rocky Desertification Area soil water variation native tree species photosynthetic characteristics
作者简介 徐利霞(1978一),女,河南鹤壁人,硕士研究生,主要从事林木培育与林木生理的研究。 通讯作者:姚小华,研究员,博士,博士研究生导师。
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