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OALib Journal期刊
ISSN: 2333-9721
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青藏高原高寒草甸植物开花物候对极端干旱的响应
DOI: 10.3724/SP.J.1145.2013.00272, PP. 272-279
Keywords: 极端干旱,青藏高原,高寒草甸,开花物候,花期持续时间
Abstract:
干旱等极端气候事件增加是全球气候变化的重要特征之一，其生态系统效应的研究对预测未来生态系统格局和功能具有重要意义.通过野外模拟分别发生在植物生长季初期和旺期的百年一遇极端干旱事件，研究了青藏高原高寒草甸植物群落的开花物候对极端干旱的响应.结果表明：（1）生长季初期的极端干旱显著提前半花期2.3d（p=0.023），生长季旺期极端干旱显著缩短花期持续时间2.3d（p=0.042）；（2）开花物候对极端干旱的响应与植物本身繁殖季节性有关；（3）不同功能群开花物候对极端干旱响应不一，双子叶杂类草最敏感，其半花期显著提前2.8d（p=0.049），莎草类和禾草类表现出一定抵抗力；（4）极端气候事件对植物物候产生的生态效应强烈，与其他研究揭示的趋势性降水变化产生的生态效应有显著区别.图4表3参58
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