不同立地类型柳杉和柏木光合特性研究
Photosynthetic characteristics of Cryptomeria fortunei and Cupressus funebris in different site types
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摘要: 以地震主断裂带上北川县和安县地区的主要树种柳杉和柏木为研究对象，采用Li-6400光合测定系统于2010年5月对未滑坡、滑坡和局部山体崩塌林地上柳杉和柏木的光合特征指标进行测定。结果表明：不同立地类型的柳杉净光合速率(Pn)、蒸腾速率(Tr)、胞间二氧化碳浓度(Ci)和气孔导度(gs)表现出相同的变化，都是未滑坡局部山体崩塌滑坡，且未滑坡与滑坡的柳杉Tr、 Ci和gs都有极显著差异，滑坡柳杉的瞬时水分利用效率(WUE)最高，为3.94 μmol/mmol，不同立地类型的柳杉WUE差异不显著；柏木的Pn和 Tr表现为局部山体崩塌未滑坡滑坡，局部山体崩塌的柏木Pn和 Tr分别高出未滑坡和滑坡的91.10%、119.69%和47.50%、73.52%，局部山体崩塌与滑坡的Pn和 Tr都有极显著差异；在3个立地类型中，柏木Pn和 Tr分别低于柳杉的Pn和 Tr，而柏木的WUE则高于柳杉的WUE。Abstract: Cryptomeria fortunei and Cupressus funebris, which were in Beichuan and Anxian counties of the earthquake disaster areas, were studied in this paper. Photosynthetic characteristics were measured by Li6400 in May 2010 on nonlandslide, landside and local collapse site types. The results showed that Pn, Tr, Ci and gs of C. fortunei exhibited same changing rules in different site types, ie nonlandslidelocal collapselandside; and Tr, Ci and gs of C. fortunei in nonlandslide and landside were significant different; WUE of C. fortunei on landslide forestland was the highest by 394 μmol/mmol, and there was no significant differences among varied site types. For C. funebris, Pn and Tr showed the rule of local collapsenonlandslidelandside forestland; Pn and Tr in local collapse were 91.10%，119.69% and 47.50%，73.52% higher than those in nonlandslide and landside forestland respectively, which were significant different between local collapse and landslide. In three site types, Pn and Tr of C. funebris were lower than those of C. fortunei, while WUE of C. funebris was higher than that of C. fortunei.
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