作 者：Chen, LZ; Wang, WQ; Li, QSQ; Zhang, YH; Yang, SC; Osland, MJ; Huang, JL; Peng, CJ

影响因子：2.49

刊物名称：ECOSPHERE

出版年份：2017

卷：8(6) 页码: e01865

The global distribution and diversity of mangrove forests is greatly influenced by the frequency

and intensity of winter air temperature extremes. However, our understanding of how different

mangrove species respond to winter temperature extremes has been lacking because extreme freezing and

chilling events are, by definition, relatively uncommon and also difficult to replicate experimentally. In this

study, we investigated species-specific variation in mangrove responses to winter temperature extremes in

China. In 10 sites that span a latitudinal gradient, we quantified species-specific damage and recovery

following a chilling event, for mangrove species within and outside of their natural range (i.e., native and

non-native species, respectively). To characterize plant stress, we measured tree defoliation and chlorophyll

fluorescence approximately one month following the chilling event. To quantify recovery, we measured

chlorophyll fluorescence approximately nine months after the chilling event. Our results show high

variation in the geographic- and species-specific responses of mangroves to winter temperature extremes.

While many species were sensitive to the chilling temperatures (e.g., Bruguiera sexangula and species in the

Sonneratia and Rhizophora genera), the temperatures during this event were not cold enough to affect certain

species (e.g., Kandelia obovata, Aegiceras corniculatum, Avicennia marina, and Bruguiera gymnorrhiza). As

expected, non-native species were less tolerant of winter temperature extremes than native species. Interestingly,

tidal inundation modulated the effects of chilling. In comparison with other temperaturecontrolled

mangrove range limits across the world, the mangrove range limit in China is unique due to the

combination of the following three factors: (1) Mangrove species diversity is comparatively high; (2) winter

air temperature extremes, rather than means, are particularly intense and play an important ecological role;

and (3) due to afforestation and restoration efforts, several species of non-native mangroves have been

introduced beyond their natural range limits. Hence, from a global perspective, mangroves in China provide

valuable opportunities to advance understanding of the effects of freezing and chilling temperatures

on mangroves. Within the context of climate change, our findings provide a foundation for better understanding

and preparing for mangrove species-specific responses to future changes in the duration and

intensity of winter temperature extremes.

Fig.5.Maximum photochemical efficiency of PSII

(ΦPSII; mean _ SE Fv/Fm) of mangrove species at two

study sites (Longhai and Wenchang) following the

2008 chilling event. March and November measurements

were taken approximately one and nine months

after the event, respectively. Univariate ANOVA

results are also shown. Ko, Kandelia obovata; Am, Avicennia

marina; Ac, Aegiceras corniculatum; Bg, Bruguiera

gymnorrhiza; Bs, Bruguiera sexangula; Rs, Rhizophora

stylosa; Ra, Rhizophora apiculata; Sc, Sonneratia caseolaris;

Sg, Sonneratia 9 gulngai; Sa1, Sonneratia apetala; Sa2,

Sonneratia alba.