不同土壤对白黎檬光合特性的影响

Effects of Different Soils on Photosynthetic Characteristics of Citrus limonia

为了探索白黎檬对不同土壤的适应性,采用盆栽土培试验研究了白黎檬在变质岩母质黄壤、第4纪红色粘土母质黄壤、黄色石灰土、棕色石灰土和黑色石灰土5种土壤上的光合特性,分析土壤养分含量与白黎檬光合速率(Pn)的关系。结果表明:①黑色石灰土上白黎檬的Pn最大,为8.91μmolCO2/(m2.s)叶绿素(Chl)含量最高,为2.24 mg/g,对光照强度的适应范围最大;黄色石灰土上白黎檬的Pn及Chl含量都仅次于黑色石灰土,而第4纪红色粘土母质黄壤上白黎檬的Pn最小,为1.17μmolCO2/(m2.s),Chl含量最低,为0.73 mg/g;土壤中碱解氮、有效性铁和有效性铜对白黎檬Pn的影响显著,而其他矿质元素对白黎檬Pn的影响均不显著。②在相同气候、不同土壤条件上的白黎檬Pn、Chl含量及基本需光特性均发生了适应性变化,且以黑色石灰土最有利于白黎檬光能利用率的提高。

To explore the adaptability for C.limonia to different soils,the seedlings were planted separately in pots with metamorphic rocks cane yellow soil,quaternary red clay cane yellow soil,yellow calcareous soil,brown calcareous soil and black calcareous soil.Photosynthetic characteristics of C.limonia in five different soils were studied,and the relation between soil nutrient and photosynthetic rate（Pn） of C.limonia was analyzed.The results showed that：（i） Pn of C.limonia in black calcareous soil was the highest[8.91 μmol CO2/（m2·s）],chlorophyll（Chl） content was also the highest（2.24 mg/g-1,and the adaptability range to light intensity was the widest;Pn and Chl content of C.limonia in yellow calcareous soil took the second place,while Pn and Chl content in quaternary red clay cane yellow soil were both the lowest[1.17 μmolCO2/（m2·s） and 0.73 mg/g].The effects of alkaline hydrolysis N,available Fe and available Cu in different soils on Pn of C.limonia were significant,while other mineral elements in different soils on Pn of C.limonia were not significant.（ii） Under the same climate condition,the adaptability changes of Pn content,Chl content and basic light requirement characteristics of C.limonia occurred on different soils,and black calcareous soil was the most conducive to the improvement of light utilization efficiency of C.limonia.