Warming and Nitrogen Addition Alter Photosynthetic Pigments, Sugars and Nutrients in a Temperate Meadow Ecosystem.
Warming and Nitrogen Addition Alter Photosynthetic Pigments, Sugars and Nutrients in a Temperate Meadow Ecosystem.
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变暖和氮添加改变温带草甸生态系统中的光合色素、糖和营养物质
DOI：
10.1371/journal.pone.0155375
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Guo J
中科院分区：
文献类型：
--
作者：
Zhang T;Yang S;Guo R;Guo J
全球变暖和氮沉降对陆地生态系统有重要影响，但对植物光合产物和养分循环的影响尚不清楚。我们研究了3年的变暖和氮添加对植物光合产物，叶片化学和化学计量比的两个优势物种，即，中国东北温带草甸的羊草和芦苇。增温显著提高了叶绿素含量和可溶性糖含量。而对类胡萝卜素和果糖含量无影响。氮的添加引起类胡萝卜素和果糖含量的显着增加。增温和施氮对芦苇光合产物的影响不大。升温导致了N和P浓度的显著降低，并显著提高了L. chinensis，但不影响C浓度或C：N比。施氮显著提高了L.的N浓度、C：P和N：P比，但显著降低了C：N比。中国。升温显著增加了芦苇C和P浓度以及C：N和C：P比值，而N添加增加了C，N和P浓度，但对化学计量变量没有影响。这项研究表明，变暖和氮添加对植物光合作用和元素化学计量有直接影响，这可能在温带草甸生态系统中植物介导的生态地球化学循环中起着至关重要的作用。
Global warming and nitrogen (N) deposition have an important influence on terrestrial ecosystems; however, the influence of warming and N deposition on plant photosynthetic products and nutrient cycling in plants is not well understood. We examined the effects of 3 years of warming and N addition on the plant photosynthetic products, foliar chemistry and stoichiometric ratios of two dominant species, i.e., Leymus chinensis and Phragmites communis, in a temperate meadow in northeastern China. Warming significantly increased the chlorophyll content and soluble sugars in L. chinensis but had no impact on the carotenoid and fructose contents. N addition caused a significant increase in the carotenoid and fructose contents. Warming and N addition had little impact on the photosynthetic products of P. communis. Warming caused significant decreases in the N and phosphorus (P) concentrations and significantly increased the carbon (C):P and N:P ratios of L. chinensis, but not the C concentration or the C:N ratio. N addition significantly increased the N concentration, C:P and N:P ratios, but significantly reduced the C:N ratio of L. chinensis. Warming significantly increased P. communis C and P concentrations, and the C:N and C:P ratios, whereas N addition increased the C, N and P concentrations but had no impact on the stoichiometric variables. This study suggests that both warming and N addition have direct impacts on plant photosynthates and elemental stoichiometry, which may play a vital role in plant-mediated biogeochemical cycling in temperate meadow ecosystems.