Contrasting drought sensitivity and post-drought resilience among three co-occurring tree species in subtropical China
Contrasting drought sensitivity and post-drought resilience among three co-occurring tree species in subtropical China
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中国亚热带三种共生树种的干旱敏感性和干旱后恢复能力对比
DOI：
10.1016/j.agrformet.2019.03.024
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发表时间：
2019-07-15
影响因子：
6.2
通讯作者：
Liu, Juxiu
中科院分区：
文献类型：
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作者：
Duan, Honglang;Li, Yiyong;Liu, Juxiu
干旱胁迫对中国亚热带主要树种的影响，以及这些树种从干旱中恢复的能力，是相对未知的。三种重要的生态树种对干旱敏感性不同的3种植物（蒲桃、锥栗和木荷）进行盆栽试验，在温室中充分浇水，然后进行两次干旱处理（即高强度、短持续时间的快速干旱（FD）;较低强度和较长持续时间的缓慢干旱（SD））的死亡率，然后再浇水，以评估生理恢复率。在实验期间，测定了干物质生产和与水碳关系相关的生理性状。FD导致更快的下降，在所有物种的水力和光合功能比SD，而水力衰竭发生在所有物种的死亡率在两个干旱处理。虽然NSC响应干旱处理和物种之间的变化，碳饥饿没有观察到。S.叶水势和气体交换性状下降较快，死亡时间较短，其次是白肋金龟子。chinensis和S.超级低音复水后，所有三个物种表现出快速恢复叶水势，而茎导水率的快速恢复是不明显的任何物种。此外，C.中华绒螯蟹的光合作用恢复迅速，而中华绒螯蟹的光合作用恢复迅速。和S.木荷的恢复比水势的恢复慢，反映了不同的气孔和生化限制。这三个物种对干旱的反应与木质部栓塞抗性密切相关，但干旱后的恢复是复杂的，部分与气孔和生化性状。在未来更长时间和严重的干旱，这些物种可能会分化干旱反应和恢复，也许驱动在中国亚热带森林群落结构的变化。
The impact of drought stress on dominant tree species of subtropical China, and the capacity of these species to recover from drought, is relatively unknown. Three ecologically important tree species (Syzygium rehderianum, Castanopsis chinensis and Schima superba), with contrasting drought sensitivities, were grown in pots under well watered conditions in the glasshouse before being subjected to two drought treatments (i.e. higher intensity and shorter-duration fast drought(FD);lower intensity and longer-duration slow drought(SD)) towards mortality, and then re-watered to assess the rate of physiological recovery. Dry mass production and physiological traits related to water and carbon relations were measured over the experimental period. FD led to faster declines in hydraulic and photosynthetic function than SD in all species, while hydraulic failure occurred towards mortality in all species under both drought treatments. Although NSC responses varied among drought treatments and species, carbon starvation was not observed. S. rehderianum exhibited more rapid declines in leaf water potential and gas exchange traits, and shorter time-to-mortality, followed by C. chinensis and S. superba. Following re-watering, all three species showed rapid recovery of leaf water potential, while rapid recovery in stem hydraulic conductivity was not evident in any species. Furthermore, C. chinensis exhibited full rapid recovery of photosynthesis, but photosynthetic recovery in S. rehderianum and S. superba was slower than recovery of water potential, reflecting differential stomatal and biochemical limitations. The response of the three species to drought was strongly correlated with xylem embolism resistance, but recovery following drought was complex and partially associated with stomatal and biochemical traits. Under future longer and severe droughts, these species may diverge in drought responses and recovery, perhaps driving shifts in forest community structure in subtropical China.