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OALib Journal期刊
ISSN: 2333-9721
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模拟增温对川西北高寒草甸两种典型植物生长和光合特征的影响
DOI: 10.3724/SP.J.1145.2009.00750, PP. 750-755
Keywords: 川西北,增温,发草,遏蓝菜,生长,光合特征
Abstract:
在野外自然条件下采用开顶式生长室(otc)模拟增温的方法，研究了增温对川西北高寒草甸两种典型植物――单子叶草本植物发草（deschampsiacaespitosa）和双子叶草本植物遏蓝菜（thlaspiarvense）生长和光合特征的影响.结果表明，增温有利于发草地上生物量的增加，其光响应曲线明显高于对照处理，净光合速率（pn）、蒸腾速率（tr）、气孔导度（cs）、最大净光合速率（pmax）、暗呼吸速率（rd）、表观量子效率（aqy）和光饱和点（lsp）显著高于对照处理，而光补偿点（lcp）却显著低于对照处理，并且最大光能转化效率（fv/fm）、光合量子产量（yield）、光化学猝灭系数（qp）和非光化学猝灭系数（qn）与对照处理相比，都显著增加；增温后遏蓝菜的单株生物量积累显著下降，其光响应曲线也明显低于对照处理，pn、tr、cs、pmax、rd、aqy和lsp显著低于对照处理，fv/fm、yield和qp在增温后显著减少，而qn却显著增加.图5表3参25
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