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地毯草的光合特性研究
蹇洪英;邹寿青
1.中国科学院西双版纳热带植物园;2.中国科学院西双版纳热带植物园 云南勐腊666303;3.云南勐腊666303
摘要:
地毯草是一种典型的暖季型草坪草。用Li 6400便携式光合分析仪测定地毯草的光合特性。地毯草的光合日进程呈单峰型,无"午休"现象且受非气孔限制,最大净光合速率出现在14∶00,变化趋势与光合有效辐射(PAR)、气温(Ta)、蒸腾速率(Tr)等因子相同,与空气相对湿度(RH)、胞间CO2浓度(Ci)等相反;其光饱合点超过2000μmol.m 2s 1,最大净光合速率达22μmol.m 2s 1,暗呼吸速率为1.34μmol.m 2s 1,CO2补偿点为0.97μmol.mol 1,光补偿点为22.2μmol.m 2s 1,羧化效率为0.2539μmol.m 2s 1,表观光量子效率高达0.059...
关键词:  地毯草    暖季型草坪草    光合日进程    光合特征    表观光量子效率    羧化效率
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