利用开顶箱(Open Top Chambers,OTC)模拟增温的方法,研究了短期变暖对鹅绒委陵菜健康的影响。结果表明,短期变暖后降低了鹅绒委陵菜的萌蘖株死亡数、增加了单位长度匍匐茎的萌蘖株数目和其死亡率,同时叶片数目、高度和健康率比对照增加...利用开顶箱(Open Top Chambers,OTC)模拟增温的方法,研究了短期变暖对鹅绒委陵菜健康的影响。结果表明,短期变暖后降低了鹅绒委陵菜的萌蘖株死亡数、增加了单位长度匍匐茎的萌蘖株数目和其死亡率,同时叶片数目、高度和健康率比对照增加,匍匐茎长度和匍匐茎上萌蘖株数目比对照减少,同时所有表征指标中只有萌蘖死亡率和叶片高度比对照有显著变化(p<0.05)。展开更多
Low temperature is an important limiting factor for alpine ecosystems on the Tibetan Plateau. This study is based on data from on-site experimental warming platforms(open top chambers, OTC) at three elevations(4300 m,...Low temperature is an important limiting factor for alpine ecosystems on the Tibetan Plateau. This study is based on data from on-site experimental warming platforms(open top chambers, OTC) at three elevations(4300 m, 4500 m, 4700 m) on the Qinghai-Tibet Plateau. The carbon and nitrogen stoichiometry characteristics of plant communities, both above-ground and below-ground, were observed in three alpine meadow ecosystems in August and September of 2011 and August of 2012. Experimental warming significantly increased above-ground nitrogen content by 21.4% in September 2011 at 4500 m, and reduced above-ground carbon content by 3.9% in August 2012 at 4300 m. Experimental warming significantly increased below-ground carbon content by 5.5% in August 2011 at 4500 m, and the below-ground ratio of carbon to nitrogen by 28.0% in September 2011 at 4300 m, but reduced below-ground nitrogen content by 15.7% in September 2011 at 4700 m, below-ground carbon content by 34.3% in August 2012 at 4700 m, and the below-ground ratio of carbon to nitrogen by 37.9% in August 2012 at 4700 m. Experimental warming had no significant effect on the characteristics of community carbon and nitrogen stoichiometry under other conditions. Therefore, experimental warming had inconsistent effects on the carbon and nitrogen stoichiometry of plant communities at different elevations and during different months. Soil ammonium nitrogen and nitrate nitrogen content were the main factors affecting plant community carbon and nitrogen stoichiometry.展开更多
文摘利用开顶箱(Open Top Chambers,OTC)模拟增温的方法,研究了短期变暖对鹅绒委陵菜健康的影响。结果表明,短期变暖后降低了鹅绒委陵菜的萌蘖株死亡数、增加了单位长度匍匐茎的萌蘖株数目和其死亡率,同时叶片数目、高度和健康率比对照增加,匍匐茎长度和匍匐茎上萌蘖株数目比对照减少,同时所有表征指标中只有萌蘖死亡率和叶片高度比对照有显著变化(p<0.05)。
基金The National Key Research and Development Program of China(2016YFC0502001,2016YFC0502005)Youth Innovation Promotion Association of Chinese Academy of Sciences(2020054)+2 种基金The National Natural Science Foundation of China(31600432)Bingwei Outstanding Young Talents Program of Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences(2018RC202)Tibet Science and Technology Major Projects of the Pratacultural Industry(XZ201901NA03)。
文摘Low temperature is an important limiting factor for alpine ecosystems on the Tibetan Plateau. This study is based on data from on-site experimental warming platforms(open top chambers, OTC) at three elevations(4300 m, 4500 m, 4700 m) on the Qinghai-Tibet Plateau. The carbon and nitrogen stoichiometry characteristics of plant communities, both above-ground and below-ground, were observed in three alpine meadow ecosystems in August and September of 2011 and August of 2012. Experimental warming significantly increased above-ground nitrogen content by 21.4% in September 2011 at 4500 m, and reduced above-ground carbon content by 3.9% in August 2012 at 4300 m. Experimental warming significantly increased below-ground carbon content by 5.5% in August 2011 at 4500 m, and the below-ground ratio of carbon to nitrogen by 28.0% in September 2011 at 4300 m, but reduced below-ground nitrogen content by 15.7% in September 2011 at 4700 m, below-ground carbon content by 34.3% in August 2012 at 4700 m, and the below-ground ratio of carbon to nitrogen by 37.9% in August 2012 at 4700 m. Experimental warming had no significant effect on the characteristics of community carbon and nitrogen stoichiometry under other conditions. Therefore, experimental warming had inconsistent effects on the carbon and nitrogen stoichiometry of plant communities at different elevations and during different months. Soil ammonium nitrogen and nitrate nitrogen content were the main factors affecting plant community carbon and nitrogen stoichiometry.
