Wang Le-le, Zhou Zheng-Hu, Jin Ying, Wang Chuan-Kuan
Center for Ecological Research/Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management, Northeast Forestry University, Harbin 150040, China.
Ying Yong Sheng Tai Xue Bao. 2022 Jan;33(1):1-8. doi: 10.13287/j.1001-9332.202201.003.
The increases in frequency and intensity of drought worldwide has seriously affected tree growth, and even led to widespread forest mortality. Leaf traits estimated from pressure-volume (PV) curve provide key leaf physiological information that reflects the drought tolerance of trees. However, it is uncertain that which PV parameter performs the best at local scale. Here, we measured five PV traits (including TLP, π, , , and RWC) and two leaf structural traits (specific leaf area and leaf density) in 20 tree species (16 angiosperms and 4 gymnosperms) in a temperate mixed forest at the Maoershan Forest Ecosystem Research Station, Northeast China. The objectives of this study were to search the best indicators of leaf drought tolerance at local scale, and to explore the correlation between PV traits and leaf structural traits. We found that angiosperms had significantly greater RWC and lower than gymnosperms, indicating that RWC and might be the good indicators of leaf drought tolerance in temperate mixed forest in Northeast China. Within angiosperm species, TLP and π were significantly and negatively correlated with leaf density, but positively correlated with specific leaf area; while was negatively correlated with specific leaf area. However, the opposite trends between PV traits and leaf structural traits were observed between gymnosperms and angiosperms, which might be attributed to their differences in drought response and adaptation strategies.
全球干旱频率和强度的增加严重影响了树木生长，甚至导致大面积森林死亡。通过压力-容积（PV）曲线估算的叶片性状提供了反映树木耐旱性的关键叶片生理信息。然而，在局部尺度上哪个PV参数表现最佳尚不确定。在此，我们在中国东北帽儿山森林生态系统研究站的温带混交林中，对20个树种（16种被子植物和4种裸子植物）的5个PV性状（包括TLP、π、 、 、 和RWC）以及2个叶片结构性状（比叶面积和叶片密度）进行了测量。本研究的目的是寻找局部尺度上叶片耐旱性的最佳指标，并探究PV性状与叶片结构性状之间的相关性。我们发现被子植物的RWC显著高于裸子植物， 显著低于裸子植物，这表明RWC和 可能是中国东北温带混交林叶片耐旱性的良好指标。在被子植物物种中，TLP和π与叶片密度显著负相关，但与比叶面积正相关；而 与比叶面积负相关。然而，在裸子植物和被子植物之间观察到PV性状与叶片结构性状之间存在相反的趋势，这可能归因于它们在干旱响应和适应策略上的差异。
