3个引进树种苗期光合速率研究

Study on Photosynthetic Rate of Three Introduced Tree Species

[目的]为了选择适合辽宁地区生长的速生、优良树种.[方法]用Li-6400便携式光合仪测定研究了3个引进树种苗期光合效率.[结果]小干松、黄松、班克松的净光合速率均表现出“单峰型”.3个树种的蒸腾速率有差异,其中小干松和黄松为单峰型,而班克松蒸腾速率为双峰型.10点时,3个树种净光合速率差异范围为43.57～ 58.74 μmol/（m2·s）,从大到小排序为黄松、小干松、班克松;蒸腾速率差异范围为15.68～21.92 μmol/（m2·s）,从大到小排序为小干松、黄松、班克松.在12点时,3个树种净光合速率差异范围为48.39 ～ 60.35 μmol/（m2·s）,从大到小排序为小干松、黄松、班克松;蒸腾速率差异范围为15.78～17.93μmol/（m2·s）,从大到小排序为黄松、班克松、小干松.[结论]黄松、班克松、小干松这3个引进的树种均适应在辽宁地区生长.

[Objective]In order to select the suitable tree species for Liaoning area.[Method]We used the Li-6400 portable photosynthesis system to study the photosynthetic efficiency of 3 introduced species.[Result]The experimental results show that,Pinus contorta,Pinus ponderosa,Pnius banksiana photosynthetic rate showed single peak type.There are differences between the transpiration rates of 3 species,Pinus contorta and Pinus ponderosa are single peak,while Pnius banksiana transpiration rate for two-peak pattern.The 10 am.,3 species difference range of net photosynthetic rate is 43.57-58.74 μmol/（m2 · s）.Transpiration rate difference range is 15.68-21.92 μmol/（m2 · s）.In the 12 am.,3 species differences range of net photosynthetic rate is 48.39-60.35 μmol/（m2 · s）.Transpiration rate range is 15.78-17.93 μmol/（m2 · s）.[Conclusion]The results showed that 3 species are suitable for growing in Liaoning area.