摘要
采用不同浓度Ca溶液对贵州草海流域优势树种华山松、滇杨、白栎一年生幼苗进行处理,测定不同处理下碳酸酐酶活性、叶绿素含量、光合参数及固碳释氧量的变化,分析其对光合固碳能力影响。结果表明:(1)Ca浓度对CA活性呈低促高抑的趋势,阔叶树种滇杨和白栎CA活性高于针叶树种华山松;(2)Ca浓度的升高会抑制PSII反应中心的电子传递速率,植物通过增大叶片CA活性,提升PSII反应中心的原初光能转化效率,以增强实际光合效率;(3)阔叶树种滇杨和白栎对Ca最适浓度为100 mg/L,针叶树种华山松为50 mg/L,植物固碳释氧能力与CA活性具有相关性。这说明喀斯特高钙适生植物能够利用生境特点,增强植物叶片碳酸酐酶活性,有效促进其光合固碳能力,这对优化喀斯特岩溶地区植物固碳能力具有重要意义。
The one-year-old young seedlings of three dominant tree species （Pinus armandi, Populus yunnanensis and Quercus fabri） in Caohai watershed were treated with different concentriations of Ca solutions, the carbonic anhydrase （CA） activity, chlorophyll, fluorescence and carbon fixation and oxygen release were determined and the effects of 4 variables on photosynthetic carbon fixation capacity of the tested trees were analyzed. The results show that （1） The CA activity was promoted with low concentration of Ca and suppressed with high concentration of Ca, the CA activities of broad-leaved species, P.s yunnanensis and Q. fabri, were stronger than that of P. armandi; （2） As the Ca concentration was elevated, the electron transporting rate of PSII reaction center was inhibited, the primary light energy conversion efficienty of PSII reaction center could be enhanced through the increase of CA activity of tree leaf, and the actual photosynthetic efficiency can be enhanced as well; （3） The optimum Ca concentration of broad-leaved tree species, P. yunnanensis and Q. fabri, was 100 mg/L, that of the conifer species R armandii was 50 mg/L, there existed correlation between carbon fixation and oxygen release and CA activity. Therefore, the adaptive tree species in karst with high calcium environment could take advantage of local habitat characteristics, which could enhance the CA activity of tree leaves and effectively promote the photosynthetic carbon sequestration capacity. This is significant to the carbon sequestration ability optimization of the tree species in karst areas.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2013年第12期106-112,共7页
Journal of Central South University of Forestry & Technology
基金
国家"十二五"科技支撑计划课题"草海湿地生态系统恢复与重建关键技术研究与示范"(2011BAC02B02)
关键词
恢复生态学
优势种
碳酸酐酶
固碳释氧
草海流域
贵州
restoration ecology
dominant tree species
carbonic anhydrase
carbon fixation and oxygen releas
Caohai watershed
Guizhou province
