浙江省8个树种的秋季水分特性

为了探讨浙江省低山丘陵区生态保健园树种秋季水分利用特性,采用Li-6400光合作用测定系统和压力室以及压力-容积(P-V)技术,测定了木荷Schima Superba,苦槠Castanopsis sclerophylla,石栎Lithocarpus glabra,东南石栎L.harlandii,红叶石楠Photinia serrulata,红花檵木Lorpetalum chindense var.rubrum,竹柏Podocarpus nagi和杜英Elaeocarpus sylvestris等8个树种的光合速率、蒸腾速率以及水分特征参数(包括质壁分离时渗透势πp,饱和渗透势π0,束自比Vp/V0,相对含水量CRW和细胞弹性模量ξ).结果表明:水分利用效率峰值最高的树种为木荷(28.52mmol· mol-1),最低的是苦槠(12.92 mmol·mol-1).日水分利用效率最高的是石栎(10.44 mmol· mo1-1),最低的为苦槠(4.03 mmol·mol-1).通过5项水分参数的综合比较,吸水能力较强的树种有木荷、东南石栎、红花檵木、苦槠,吸水能力表现较弱的是石栎、杜英、红叶石楠、竹柏；忍耐脱水能力排序为木荷＞红花檵木＞东南石栎＞苦槠＞石栎＞杜英＞红叶石楠＞竹柏.树种的各个生理参数之间的相关分析表明,Vp/V0与πp,π0,ξ之间有显著相关关系,其余的参数之间无显著相关.

Autumnal water features of eight tree species in Zhejiang

To determine the value of photosynthetic rate（Pn）,transpiration rate（Tr）,and water feature parameters osmotic potential at turgorloss peint（ξp）,water potential at water saturation point（ξ0）,（rate of bound water in cell）（VP /V0）,relatire content of water（CRW）,and bulk modulus of elasticity（ξ）] of eight tree species,namely Schima superba,Castanopsis sclerophylla,Lithocarpus glabra,Lithocarpus harlandii,Photinia serrulata,Loropetalum chinense var.rubrum,Podocarpus nagi,and Elaeocarpus sylvestris,in the Zhejiang hilly area during autumn,a Li-Cor（Li）-6400 photosynthesis system,a pressure chamber,and pressure-volume（P-V） technology were utilized.A correlation analysis of the parameters was conducted.Results of the correlation analysis showed significant（P 0.05） relationships between VP /V0 and ξ（r = 0.809）,VP /V0 and ξ0（r =-0.732）,VP /V0 and ξp（r = 0.801）.The highest peak water use efficiency（WUE） was found in S.superba（28.52 mmol·mol-1） and the lowest with C.sclerophylla（12.92 mmol·mol-1）.The highest water use efficiency per day was with Lithocarpus glabra（10.44 mmol·mol-1）,where as the lowest was for C.sclerophylla（4.03 mmol·mol-1）.Comparing the five water parameters,the order of water absorption capacity was S.superba Loropetalum chinense var.rubrum Lithocarpus harlandii C.sclerophylla Lithocarpus glabra E.sylvestris Photinia serrulata Podocarpus nagi;whereas the order of dehydration tolerance was S.superba Loropetalum chinense var.rubrum Lithocarpus harlandii C.sclerophylla Lithocarpus glabra E.sylvestris Photinia serrulata Podocarpus nagi.