Subjects: Biology >> Ecology submitted time 2017-04-11 Cooperative journals: 《生态学报》
Abstract：为了探讨不同生境盐地碱蓬对低氮生境的适应机制，测定了盐渍环境下(200 mmol/L NaCl)不同浓度硝态氮(0.3、 5 mmol / L NO-3 ⁃N) 预处理两种生境盐地碱蓬经氮饥饿后的 NO-3 含量、硝酸还原酶( NR) 活性、光合特性及生长状况。 结果表明， 0.3 和 5 mmol / L NO-3 ⁃N 处理以及进行氮饥饿时，潮间带生境盐地碱蓬叶片 NO-3 含量均高于内陆生境盐地碱蓬。 与内陆生境盐 地碱蓬相比，氮饥饿后，潮间带生境盐地碱蓬叶绿素含量、NR 活性和光合放氧速率下降幅度均小于内陆生境盐地碱蓬，在 0.3 mmol / L NO-3 ⁃N 预处理进行氮饥饿时趋势更加明显。 0.3 mmol / L NO-3 ⁃N 预处理后氮饥饿对潮间带生境盐地碱蓬根冠比没有影响， 却降低内陆生境盐地碱蓬根冠比。 上述结果表明，低氮条件下潮间带生境盐地碱蓬具有较高的 NO-3 储存能力，在环境持续氮素缺 乏时具有较高的 NO-3 ⁃N 再利用能力，能更好地维持氮代谢以及光合性能。 说明潮间带生境盐地碱蓬能更好地适应低氮生境。
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： Junggar Basin is a typical arid inland region in the northern temperate zone of the Earth. The surrounding high mountains form runoff, which flows into the basin and develops oasis. Oasis and desert are interdependent. Oasis needs to leach out its naturally accumulated salts through drainage. This drainage provides water and nutrients to desert vegetation. Desert vegetation, in turn, provides an ecological protection for oasis. Hence, oasis and desert have a symbiotic relationship. With excessive exploitation of land and water resources with water-saving technologies, salts cannot be leached out of the oasis region anymore. As a result, the groundwater level has also dropped sharply, which has inevitably threatened the vegetation in the periphery of oasis, and the oasis#2;desert symbiotic relationship is facing a fundamental crisis. Funded by “the Key Infrastructure Project for the Field Station Network of Chinese Academy of Sciences (CAS)”, Fukang Desert Ecosystem Observation and Experiment Station, CAS, built the “Experiment and Simulation Platform for Oasis-Desert Symbiotic Relationship”, which consists of three sub platforms, namely: the sub-platform of soil salt accumulation and groundwater table simulation, the sub-platform of groundwater depth and vegetation relationship in the periphery of the desert, and the sub-platform of precipitation and vegetation relationship inside desert. The platform can meet the demands of the long-term studies of salt dynamics under different irrigation regimes in the oasis, the relationship between desert vegetation and groundwater level at the oasis edge, and the relationship between natural vegetation and precipitation change inside the desert. It provides an important infrastructure for studying and answering key scientific questions on the symbiotic relationship between oasis and desert ecosystems
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