| 摘要: |
| 【目的】研究大田条件下铃铛子叶片对光和CO2响应特性、光合参数日进程变化及其与主要环境因子的关系，探讨影响铃铛子光合作用的主要环境因子。【方法】以西藏林芝地区大田生长的当年生铃铛子为研究对象，在营养生长期（YYQ）、开花期（KHQ）和结果期（JGQ），利用Li-6400光合仪原位测定叶片光响应曲线和CO2响应曲线、光合参数的日进程及环境因子的变化；用叶子飘的模型拟合响应曲线光合参数，计算日进程光合参数、水分利用效率（WUE）、羧化效率（CE）和气孔限制值（Ls）的瞬时值；用多元回归和相关系数法分析铃铛子光合参数日进程特性及其与环境因子的关系。【结果】光响应曲线参数拟合结果显示，铃铛子净光合速率（Pn）在YYQ最大，暗呼吸速率（Rd）在KHQ最高，且对强光的利用率高；不同生长期光合参数日进程总体为单峰曲线，Pn在12:00左右达到最高，午后Pn下降是由非气孔限制造成的。在不同生长期的相同时刻，铃铛子Pn和WUE在YYQ最大而在JGQ最小，蒸腾速率（Tr）为KHQ最高而YYQ和JGQ均较小。环境因子中光合有效辐射（PAR）、空气温度（Ta）和土壤湿度（RHs）对Pn的影响较大。【结论】大田种植铃铛子应选择光照充足、方便灌溉的地块，在YYQ和KHQ做好田间水分管理，以保证其正常生长所需要的水分供给。 |
| 关键词: 铃铛子 光合特性 环境因子 多元线性回归 相关分析 |
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| 基金项目:国家科技支撑计划项目（2011BAI13B06,2007BAC06B08）；西藏自治区科技厅重大项目（2010KJGX01-36,2011-68 20） |
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| Relationship between photosynthetic characteristics of field cultivated Anisodus luridu and main environmental factors |
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| Abstract: |
| 【Objective】The study aimed to analyze the response of leaves of field cultivated Anisodus luridu to light and CO2,and relationship between diurnal change of photosynthesis and main environment factors.【Method】Light curve,ACI curve and diurnal change of photosynthetic parameters were measured with Li-6400 during periods of vegetative (YYQ),blooming (KHQ) and fruiting (JGQ) in leaves of field cultivated A.luridu seedling in Linzhi,Tibet.Ye Z-P model based response curve fitting was constructed.The instantaneous values of water use efficiency WUE),carboxylation efficiency(CE) and stomatal limitation (Ls) were calculated according to the photosynthesis parameters.Then,the relationship between the photosynthesis characteristic and environment factors were analyzed by multiple linear regression and correlation coefficients.【Result】The maximum Pn of A.luridu appeared during YYQ,while the maximum Rd and light use efficiency for stronger PAR occured during KHQ.Diurnal change of Pn showed a single peak curve during different growing periods.Pn reached to the maximum at 12:00 pm,and then declined by non-stomatal limitation.At the same time of the three diurnal changes,the maximum of Pn and WUE appeared during YYQ,the minimum of them appeared during JGQ,and the maximum of Tr appeared during KHQ,the minimum of Tr appeared during YYQ and JGQ.In addition,environment factors PAR,Ta and RHs had the most significant effects on Pn.【Conclusion】Field with sufficient sunshine and convenient irrigation during YYQ and KHQ was suitable for A.luridu planting. |
| Key words: Anisodus luridu photosynthetic environmental factors multiple linear regression correlation analysis |
