Growth performance and leaf ecophysiological traits in three Aquilaria species in Malaysia
Growth performance and leaf ecophysiological traits in three Aquilaria species in Malaysia
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DOI：
10.1007/s11056-018-09693-7
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发表时间：
2018-12
期刊：
影响因子：
2.2
通讯作者：
T. Kenzo;R. Yoneda;Ayumi Tanaka‐Oda;M. Azani
中科院分区：
文献类型：
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作者：
T. Kenzo;R. Yoneda;Ayumi Tanaka‐Oda;M. Azani
沉香属（麝香草科）被广泛用于生产沉香，包括东南亚的几个有价值的种植园物种。为了了解合适的种植条件，有必要描述物种特有的生态特征，如光合作用和耐旱性。为此，我们在马来西亚的三个Aquilariaseedlings（A.hirta，A.malaccensis，A.subintegra）之间的叶片形态和光合特性进行了测量。我们还监测了生长和生存的变化，在阴凉的苗圃和7和18个月后转移到开放条件。为了避免移植应激，将幼苗保存在塑料袋中。结果表明，毛白杨的叶片角质层与表皮层比值、单位面积叶质量和δ 13 C值所指示的长期水分利用效率均最高，表明毛白杨具有较强的耐旱性。相比之下，亚整合相思的最大光合速率和气孔导度较高，说明其生长速率较高，但其耐旱性在所研究的树种中最低。在光合作用和耐旱性方面，malaccensis被认为是一个中间物种。在开放条件下，种间的生长和存活率存在差异，硬毛蒿的生长率最低，存活率最高（18个月后存活率为50%），而亚整合蒿的生长率最高，存活率最低（18个月后存活率为9%）。重音不全介于两者之间。综上所述，所研究的沉香属物种在我们研究的开放和干燥条件下对胁迫敏感。这包括Aquilaria hirta，这一组中最耐旱的物种，和A.subintegra，最易受干旱影响的物种，在开放条件下种植时可能需要仔细管理。
The genusAquilaria(Thymelaeaceae) is widely used for the production of agarwood, and includes several valuable plantation species in Southeast Asia. To understand appropriate planting conditions, it is necessary to characterize species-specific ecological traits such as photosynthesis and drought tolerance amongAquilariaspecies. To this end, we measured leaf morphological and photosynthetic traits among threeAquilariaseedlings (A.hirta,A.malaccensis,A.subintegra) in Malaysia. We also monitored changes in growth and survival in a shaded nursery and 7 and 18 months after transfer to open conditions. To avoid transplant stress, the seedlings were kept in polybags. The highest leaf cuticle and epidermis layer ratio, leaf mass per area, and long-term water use efficiency indicated byδ13C were recorded inA.hirta, suggesting that this species had relatively high drought tolerance. By contrast, the high maximum photosynthetic rate and high stomatal conductance observed inA.subintegraexplained their high growth rate, although their drought tolerance was the lowest among the studied species.A. malaccensiswas considered an intermediate species in terms of photosynthesis and drought tolerance. Interspecific differences in growth and survival were present after transfer to open conditions.A.hirtahad the lowest growth rate and highest survival rate (50% survival after 18 months), whereasA.subintegrahad the highest growth rate and lowest survival rate (9% survival after 18 months).A. malaccensiswas intermediate between the two. In summary, the studiedAquilariaspecies were susceptible to stress under the open and dry conditions of our study. This includesAquilaria hirta, the most drought-tolerant species in this group, andA.subintegra, the most vulnerable species to drought, which may require careful management when planted in open conditions.