喀斯特环境下两种生物质能源植物的光合产能

Photosynthetic energy production by two species of biomass energy plants under karst environment

关键词:  麻疯树  油桐  净光合速率  叶绿素荧光  热值

Key words:  J. curcas  V. fordii  net photosynthetic rate  chlorophyll fluorescence  gross calorific value

摘要:

以贵州省贞丰县鲁荣乡五个地区为采样点,选择各点生长良好、树龄4～5 a的野生成年麻疯树与油桐作为研究对象,测定采样点土壤的理化性质和植物的光合、叶绿素荧光参数及干质量热值。结果表明:土壤磷含量的大小顺序为许妹<沙坝<喜朝<孔索<里外; 土壤HCO^-₃含量大小顺序为许妹>喜朝>里外>孔索>沙坝。土壤pH>8时,土壤有效磷含量越高或者HCO^-₃含量越低,麻疯树与油桐光合能力越强,同一生长点的麻疯树光合与抗胁迫能力都高于油桐。麻疯树和油桐热值均随土壤磷含量增加而增大,随土壤HCO^-₃含量增加而减小。油桐抗逆性差于麻疯树,但产能多于后者。因此,可以依据土壤的理化性质选择种植麻疯树和油桐。

Abstract:

The experiment was conducted in five sampling sites in Lurong Town,Zhenfeng County,Guizhou Province. Four to five years' old wild Jatropha Curcas L. and Vernicia Fordii H. which grew well in each sampling site were studied by analyzing photosynthesis characteristics,chlorophyll fluorescence features and gross calorific value,meanwhile,physical and chemical properties of soils were determined. The results showed that the content sequence of soil available phosphorus was Xumei<Shaba<Xichao<Kongsuo<Liwai,and that of soil bicarbonate was Xumei>Xichao>Liwai>Kongsuo>Shaba. With pH>8,the higher the soil available phosphorus content or the lower the soil bicarbonate content was,the higher the photosynthetic capacity of J. curcas and V. fordii were. At same sampling site,the photosynthetic capacity and stress resistence ability of J. curcas were better than V. fordii. The gross calorific value of both J. curcas and V. fordii increase along with the soil available phosphorus content increased,while decrease with the soil bicarbonate content increased. Although the stress resistence ability of V. fordii was a little lower than that of J. curcas,it could accumulate more energy. Therefore,planting and developing J. curcas and V. fordii could be selected according to the physical and chemical properties of soils.