中国生态农业学报2018，Vol.26Issue(1)：106-115,10.DOI:10.13930/j.cnki.cjea.170529
模拟降水和氮沉降对准噶尔盆地南缘梭梭光合生理的影响
Combined effect of simulated precipitation and nitrogen deposition on photosynthetic physiology of Haloxylon ammodendron in southern margin of Junggar Basin, China
摘要
Abstract
Precipitation and nitrogen deposition are two of the most investigated factors of global climate change which also are the controlling factors of desert ecosystems. This study examined the combined effects of precipitation and nitrogen deposition on arid ecosystems in order to provide insight into the responses of ecosystems to global climate change. We selected plantation of Haloxylon ammodendron in the southern margin of Junggar Basin. Two precipitation conditions [natural precipitation (W0) and 30% increased precipitation (W1)] and three levels of nitrogen depositions [natural nitrogen deposition (N0), 30 kg(N)·hm-2·a-1(N1) and 60 kg(N)·hm-2·a-1(N2) increased natural nitrogen deposition] were randomly added to simulate nitrogen deposition and precipitation for two years to explored the effects of precipitation, nitrogen deposition and the combined effects on diurnal change in photosynthetic and physioecological traits of H. ammodendron. The results showed that precipitation, nitrogen deposition and the combined effects had direct significant correlation with diurnal change in net photosynthetic rate of H. ammodendron. Based on the variation in net photosynthetic rate, intercellular CO2 concentration and stomatal limitation of H. ammodendron, "midday depression" of photosynthesis was mainly caused by nonstomatal factors. Moreover, with increased nitrogen deposition, there were decreasing physiological indexes (MDA content, POD activity, CAT activity, SOD activity, soluble protein content and soluble sugar content) under W0precipitation condition. However, proline content initially decreased before eventually increasing. There were initial increases followed by decreases in physiological indexes (MDA content, POD activity, CAT activity, SOD activity, soluble protein content, proline content and soluble sugar content) under W1 precipitation condition. With the exception of W1N1, proline content was lower under nitrogen deposition increase treatments than under the natural deposition treatment. Also MDA content, antioxidant enzymes activities, soluble protein content and soluble sugar content of H. ammodendron were also significantly lower under the other water/nitrogen treatments than under the control regimes. The results from the comprehensive analysis indicated that precipitation, nitrogen deposition and the combined effects benefited the growth of H. ammodendron, but the strength of the combined effect depended on the ratio between the nitrogen deposition and precipitation.关键词
梭梭/降水/氮沉降/水氮交互/光合生理特征/准噶尔盆地南缘Key words
Haloxylon ammodendron/Precipitation/Nitrogen deposition/Interaction of water and nitrogen/Photosynthetic physiological traits/Southern margin of Junggar Basin分类
农业科技引用本文复制引用
张维,赵文勤,谢双全,张莉,吕新华,贺亚玲..模拟降水和氮沉降对准噶尔盆地南缘梭梭光合生理的影响[J].中国生态农业学报,2018,26(1):106-115,10.基金项目
国家重点基础研究发展计划(973计划) (2014CB954203)和国家自然科学基金项目(31360139, 41561010, 31560177)资助 The study was supported by the National Basic Research Program of China (973 Program) (2014CB954203) and the National Natural Science Foundation of China (31360139, 41561010, 31560177). （973计划）
