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丝绸之路经济带国际航空枢纽竞争力分析与战略发展研究——以乌鲁木齐机
吴文婕
学位类型硕士
2016
学位授予单位中国科学院大学
学位授予地点北京
其他摘要(1) Lower water potential values were measured in H. ammodendron and T. elongata under both high salinity and drought treatments. T. elongata had higher mean water potential compared to H. ammodendron under all treatments. However, mean water content in H. ammodendron was greater than T. elongata. Assimilating shoot water content in H. ammodendron under the control treatment was smaller than under the salinity treatment, whereas leaf water content in T. elongata decreased with the salinity treatment. (2) The salinity treatment caused significant reductions in photosynthetic rate (A), stomatal conductance (gs) and transpiration rate (T), similar patterns were also observed with the drought treatment. The salinity treatment reduced chlorophyll content in both H. ammodendron and T. elongata, whereas the drought treatment resulted in a significant reduction in chlorophyll content in H. ammodendron but not in T. elongata. (3) For the two studied plants, there were positive correlations between carbon isotopic composition (δ13C) and salinity. The drought treatment induced an increase in δ13C values in T. elongata but had no significant effects on δ13C in H. ammodendron. Lower nitrogen isotopic composition (δ15N) values were detected under both salinity and drought treatments. In addition, δ13C and δ15N were influenced by the duration of salinity and drought treatments, δ13C values in H. ammodendron were reduced over time, whereas δ13C values in T. elongata were increased. With the extension of treatment time, 15N in H. ammodendron was enriched while 15N in T. elongata was depleted. These results suggest H. ammodendron adapted quicker than T. elongata to manipulated changes in environmental stresses. (4) Leaf carbon and nitrogen content in H. ammodendron and T. elongata were significantly decreased under the high salinity treatment. With increasing salinity, C:N ratio in H. ammodendron gradually increased; whereas C:N ratio showed a pattern of decreasing in T. elongata. Leaf Na+ concentration increased and K+ concentration decreased with the intensification of the salinity treatment in the two studied species. The observed enhancement in Na+ concentration may be an adapting mechanism associated with osmosis regulation. (5) We observed significant correlations between δ13C values and water potential, chlorophyll content, gs, T, C:N and Na/K; therefore δ13C values could be used as a robust indicator of the intensity of drought and salinity stress.
语种中文
文献类型学位论文
条目标识符http://ir.xjlas.org/handle/365004/14735
专题研究系统_荒漠环境研究室
作者单位中科院新疆生态与地理研究所
推荐引用方式
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吴文婕. 丝绸之路经济带国际航空枢纽竞争力分析与战略发展研究——以乌鲁木齐机[D]. 北京. 中国科学院大学,2016.
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