木荷种源间光合作用参数分析  

An analysis of photosynthetic parameters among Schima superba provenances

作　　者：熊彩云[1] 曾伟[1] 肖复明[1] 曾志光[1] 涂圣勇 江斌 邱凤英[1] 伍艳芳[1] 

机构地区：[1]江西省林业科学院,南昌330032 [2]江西省永丰县官山林场,永丰331506

出　　处：《生态学报》2012年第11期3628-3634,共7页Acta Ecologica Sinica

基　　金：江西省科技厅农业攻关项目(200110101003);江西省财政林业重大专项资助(200651010301)

摘　　要：基于直角双曲线修正模型估算3个不同纬度的木荷种源(开平、太平和永丰种源)光补偿点、饱和点、最大净光合速率等参数,以便为评价不同木荷种源对环境的适应能力和优良种源选择等提供科学依据。结果表明:在3个不同纬度种源中,开平种源具有最高的净光合速率、最大净光合速率和较高的表观量子效率,且其生长速率最快;太平种源光饱和点最高,但其净光合速率、表观量子效率和最大净光合速率最低,其生长速率也最低;永丰种源具有较高的净光合速率、最大净光合速率和表观量子效率,其生长速率略高于太平种源。3个不同纬度木荷种源中,南部开平种源对当地环境具有较强的适应能力和生长潜力,具有较高的推广应用价值。Schima superba, a subtropical evergreen broad-leaved tree species, plays an important role in biological fireproofing and timber production in China. Previous studies focused mainly on the cultivation technique, fire forest belt construction and physiological ecology characteristic of S. superba. Photosynthetic parameters can be used to reflect tree growth characters. Most studies about photosynthesis of the S. superba focused on daily variation, relationship between photosynthesis and environment factors, photosynthesis rate and parameters of light response curve. Exponential function, rectangular hyperbola model, parabolic function and non-rectangular hyperbola model have been widely used to estimate parameters of light response curve. However, the maximum photosynthesis rates estimated by these models with data of light response curve were much larger than the measured values, and the light saturation points based on these models were much smaller. Moreover, these models can not model the phenomena that the photosynthesis rate decreased with increase of light intensity when light intensity was beyond light saturation points. The errors in photosynthesis rates and parameters estimation by these models of light response curve should be paid attention to. Especially, the errors caused by these models of light response curve will be amplified when the parameters of light response curve are used to the big scale models.. Fortunately, Modified rectangular hyperbola model overcomes these faults, and can model plant photosynthesis data in different light environments. It is very important for forestation to select good S. superba provenances according to provenance variation rules because S. superba has a wide natural distribution, and rich species variations. For S. superba, however, most parameters of light response curve were only estimated by exponential function, rectangular hyperbola model, parabolic function and non-rectangular hyperbola model which had much faults, and there was no available information about

关 键 词：木荷 种源 净光合速率 表观光量子速率 光饱和点 光补偿点 暗呼吸速率 

分 类 号：S792.99[农业科学—林木遗传育种]