【摘要】 2007年对嫩江沙地4种针叶树(红皮云杉、长白松、长白落叶松、樟子松)进行了盆栽模拟试验,采用Li-6400便携式光合测定系统对其主要光合参数进行了观测分析。结果表明:在0～1800μmol·m-2·s-1光照强度范围内,4种针叶树蒸腾速率与气孔导度平均值大小位次一致,为樟子松>长白松>红皮云杉>长白落叶松;平均光合速率及水分利用效率位次相同,为红皮云杉>长白松>樟子松>长白落叶松。说明樟子松和长白松较红皮云杉和长白落叶松蒸腾耗水性大,属耗水类型,红皮云杉与长白落叶松属节水类型,且红皮云杉水分利用效率高于长白落叶松。更多还原

【Abstract】 Pot simulation experiment was conducted on 4 species of conifers ( Picea koraiensis,Pinus sylvestris var. sylvestriformis,Larix olgensis,and Pinus sylvestris var. mongolica) in Nenjiang River sandy soil in 2007. The main photosynthetic parameters were observed and analyzed using LI-6400 portable photosynthesis system. Results showed that when light intensity range is within 0 ～ 1 800 μmol·m-2·s-1,the orders of the average transpiration rate and the average stomatal conductance are consistent,namely P. sylvestris var. mongolica> P. sylvestris var. sylvestriformis> P. koraiensis >L. olgensis. The sequences of the average photosynthetic rate and the water use efficiency are the same,namely P. koraiensis> P. sylvestris var. sylvestriformis> P. sylvestris var. mongolica> L. olgensis. Test results illustrate that transpiration water consumption by P. sylvestris var. mongolica and P. sylvestris var. sylvestriformis are larger than that of P. koraiensis and L. olgensis. P. sylvestris var. mongolica and P. sylvestris var. sylvestriformis are water consumption type,and P. koraiensis and L. olgensis are water-saving type,but the water use efficiency of P. koraiensis is higher than that of L. olgensis.更多还原