-
摘要: 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p,饱和渗透势0,束自比VP /V0,相对含水量CRW和细胞弹性模量)。结果表明:水分利用效率峰值最高的树种为木荷(28.52 mmolmol-1),最低的是苦槠(12.92 mmolmol-1)。日水分利用效率最高的是石栎(10.44 mmolmol-1),最低的为苦槠(4.03 mmolmol-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p,0,之间有显著相关关系,其余的参数之间无显著相关。图1表4参10Abstract: To determine the value of photosynthetic rate (Pn),transpiration rate (Tr),and water feature parameters [osmotic potential at turgorloss peint (p),water potential at water saturation point (0),(rate of bound water in cell) (VP /V0),relatire content of water (CRW),and bulk modulus of elasticity ()] 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 (r = 0.809),VP /V0 and 0 (r = -0.732),VP /V0 and p (r = 0.801). The highest peak water use efficiency (WUE) was found in S. superba (28.52 mmolmol-1) and the lowest with C. sclerophylla (12.92 mmolmol-1). The highest water use efficiency per day was with Lithocarpus glabra (10.44 mmolmol-1),where as the lowest was for C. sclerophylla (4.03 mmolmol-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. [Ch,1 fig. 4 tab. 10 ref.]
-
Key words:
- botany /
- water use efficiency (WUE) /
- pressure-volume (P-V) technology /
- water features
-
链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2012.01.007
计量
- 文章访问数: 3686
- HTML全文浏览量: 290
- PDF下载量: 1030
- 被引次数: 0