文献类型：期刊文献

中文题名：香根草形态性状和光合特性对三峡库区消落带水陆生境变化的响应

英文题名：Form Traits and Photosynthesis Characteristics of Vetiveria zizanioides Response to Flooding-drying Habitat Changes in the Hydro-fluctuation Belts of the Three Gorges Reservoir

作者：郭泉水[1] 洪明[1] 裴顺祥[2] 王祥福[3] 聂必红[4] 杨永明[4] 梁洪海[4]

第一作者：郭泉水

机构：[1]中国林业科学研究院森林生态环境与保护研究所国家林业局森林生态环境重点实验室;[2]中国林业科学研究院华北林业实验中心;[3]国家林业局西北林业调查规划设计院;[4]重庆市巫山县林业局

年份：2012

卷号：32

期号：11

起止页码：2328-2335

中文期刊名：西北植物学报

外文期刊名：Acta Botanica Boreali-Occidentalia Sinica

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2011_2012】；

基金：‘十二五’林业科技支撑计划(2011BAD38BO4);‘十一五’林业科技支撑计划(2006BAD03A313)

语种：中文

中文关键词：三峡库区;消落带;水陆生境变化;香根草;生态适应性

外文关键词：the Three Gorges Reservoir area;hydro-fluctuation belts;flooding-drying habitat changes;Veti-veria zizanioides ;ecological adaptation

分类号：Q945.79

摘要：基于定位观测,研究三峡库区消落带淹水区和未淹区香根草的形态性状、生物量、光合参数和资源利用效率,并对其适应机制进行讨论。结果显示:(1)香根草可以在消落带每年淹水期4个月左右、淹水深度小于9m的海拔区段存活。(2)淹水区香根草的地上部分多数形态性状指标较未淹区有所降低,降低幅度随香根草露出水面恢复生长的时间长短而异。(3)淹水区香根草总生物量、地上部分生物量分别减少10.58%、48.46%,而根径、根系长度、根系数量、根幅、地下生物量以及地下/地上生物量的比值分别提高12.50%、24.13%、19.09%、78.46%、30.04%、151.71%;同期香根草的蒸腾速率、气孔导度和胞间CO2浓度分别减少20.75%、9.19%和10.04%,而净光合速率、水分利用效率、表观CO2利用效率分别提高7.23%、36.47%和63.64%。研究表明,加速根系分蘖和生长、增加叶片长度和地下生物量,降低植株高度、减少蒸腾、提高水分和CO2利用效率是香根草对三峡库区消落带水陆生境变化的适应对策。
Based on located monitoring, morphological characteristics, biomass, photosynthesis and resource utilization of Vetiveria zizanioides at flooded and non-flooded areas were studied on the hydro-fluctuation belts in the Three Gorges Reservoir and the adaptation mechanism was discussed. The results showed that. （1）V. zizanioides can still live within 4 months of yearly flooding at the maximum depth of 9 m. （2）Com- pared with the V. zizanioides at the non-flooded area,most of the aboveground morphological characteris- tics of V. zizanioides at the flooded area decreased and the margin varied as the time of restore growth var-ied. （3）The total biomass,aboveground biomass, Tr ,Gs ,Ci decreased by 10. 58%,48.46% ,20.75% ,9.19% and 10.04 %, respectively, and root diameter, root length, root number, root spread range, underground bio- mass,underground and aboveground biomass ratio, P,,WUE and CUE increased by 12. 50%, 24. 13%, 19.09%,78.46%,30.04%,151.71%,7.23%,36.47% and 63.64% ,respectively. Increasing root tillering and growth,leaf length, underground biomass and underground biomass allocation and improving water and CO2 utilization while decreasing plant height and transpiration improving were the adaptation strategy of V. zizanioides in the Three Gorges Reservoir to flooding-drying habitat changes.