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为探明毛乌素沙地3年生臭柏(Sabina vulgaris)实生苗在不同光照和水分条件下的光抑制响应机制,研究了各处理臭柏实生苗的最大光化学效率(F_v/F_m)及叶绿素(Chla+Chlb)和叶黄素(A+V+Z)含量,分析了其叶绿素循环和叶黄素循环的变化规律。结果表明,77%透光区通过减少Chlb含量,升高Chla/Chlb,避免光能过剩;同时,增加A+V+Z及热散逸色素(A+Z)含量、提高(A+V+Z)/(Chla+Chlb)和(A+V)/(A+V+Z)值,耗散过剩光能,避免光破坏。25%透光区的叶绿素和叶黄素循环机制随着水分条件的变化迅速发生改变。10%透光区通过增加Chlb含量,降低Chla/Chlb,捕捉更多的光能,几乎不存在光抑制。毛乌素臭柏实生幼苗能够适应不同的光照和水分条件,在恶劣的沙漠中完成天然更新,形成独特的群落景观,与叶绿素循环和叶黄素循环有着密切的关系。
In order to find out the mechanism of photoinhibition response of Sabina vulgaris seedlings under different light and moisture conditions in Mu Us sandy land, the maximum photochemical efficiency (F_v / F_m) and chlorophyll (Chla + Chlb) and lutein (A + V + Z) content were analyzed. The changes of chlorophyll cycle and lutein cycle were analyzed. The results showed that 77% of the light-transmissive area could increase Chla / Chlb by avoiding the decrease of Chlb content and avoid excess of light energy. At the same time, the contents of A + V + Z and A + Z were increased and (A + V + Z ) / (Chla + Chlb) and (A + V) / (A + V + Z), dissipating excess light energy to avoid light damage. The chlorophyll and xanthophyll cycle mechanisms in the 25% light-transmissive area changed rapidly with changes in water conditions. The 10% light-transmissive region has little or no photoinhibition by increasing Chlb content, decreasing Chla / Chlb, capturing more light energy. The seedlings of Sabina vulgaris seedlings can adapt to different light and moisture conditions, complete natural regeneration in the harsh desert and form unique community landscapes, which are closely related to chlorophyll cycle and lutein cycle.