NWIPB OpenIR
Photosynthetic response to dynamic changes of light and air humidity in two moss species from the Tibetan Plateau
Cui, Xiaoyong1,2; Gu, Song2; Wu, Jing1; Tang, Yanhong3
2009-05-01
发表期刊ECOLOGICAL RESEARCH
ISSN0912-3814
卷号24期号:3页码:645-653
文章类型Article
摘要Bryophytes are widely distributed in alpine meadow and wetlands on the Tibetan Plateau, where light intensity and air moisture are highly variable in time. To address how bryophytes respond to their light and moisture environments, we examined dynamic photosynthesis in two moss species, Distichium inclinatum common in meadow, and Encalypta alpine frequently found in wetland. Photosynthetic induction response was faster in the two moss species than in most vascular species. In both species the 90% induction time after a sudden light increase from 50 to 600 mu mol m(-2) s(-1) was within 3 min. The induction was faster in mosses experiencing a period of weak light than in those in total darkness. E. alpina, the wetland species, showed more rapid induction response and shorter post-illumination CO(2) fixation to sunflecks than D. inclinatum, the meadow species. Photosynthetic rate (A (max)) under saturated light in the two species increased linearly with increasing air relative humidity (RH). The meadow species D. inclinatum showed higher A (max) under low RHs, but exhibited lower A (max) under high RHs in comparison with the wetland moss E. alpina. Moreover, the quantum efficiency increased linearly with increasing RH, indicating that air humidity plays a critical role in photochemical activities in the alpine mosses. The study suggests that there are acclimations in dynamic photosynthesis in response to light and humidity, and the acclimations would benefit a high leaf carbon gain in the two alpine moss species in their common habitats.; Bryophytes are widely distributed in alpine meadow and wetlands on the Tibetan Plateau, where light intensity and air moisture are highly variable in time. To address how bryophytes respond to their light and moisture environments, we examined dynamic photosynthesis in two moss species, Distichium inclinatum common in meadow, and Encalypta alpine frequently found in wetland. Photosynthetic induction response was faster in the two moss species than in most vascular species. In both species the 90% induction time after a sudden light increase from 50 to 600 mu mol m(-2) s(-1) was within 3 min. The induction was faster in mosses experiencing a period of weak light than in those in total darkness. E. alpina, the wetland species, showed more rapid induction response and shorter post-illumination CO(2) fixation to sunflecks than D. inclinatum, the meadow species. Photosynthetic rate (A (max)) under saturated light in the two species increased linearly with increasing air relative humidity (RH). The meadow species D. inclinatum showed higher A (max) under low RHs, but exhibited lower A (max) under high RHs in comparison with the wetland moss E. alpina. Moreover, the quantum efficiency increased linearly with increasing RH, indicating that air humidity plays a critical role in photochemical activities in the alpine mosses. The study suggests that there are acclimations in dynamic photosynthesis in response to light and humidity, and the acclimations would benefit a high leaf carbon gain in the two alpine moss species in their common habitats.
关键词Alpine Meadow Carbon Gain Moss Photosynthetic Induction Relative Humidity
WOS标题词Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]VAPOR-PRESSURE DEFICIT ; CARBON-ISOTOPE DISCRIMINATION ; TEMPERATE RAIN-FOREST ; CHLOROPHYLL FLUORESCENCE ; WATER-CONTENT ; STOMATAL CONDUCTANCE ; VASCULAR PLANTS ; TORTULA-RURALIS ; SPHAGNUM MOSSES ; COMMUNITY STRUCTURE
收录类别SCI
语种英语
WOS研究方向Environmental Sciences & Ecology
WOS类目Ecology
WOS记录号WOS:000266037400017
引用统计
被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/1880
专题中国科学院西北高原生物研究所
作者单位1.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
2.Chinese Acad Sci, NW Inst Plateau Biol, Xining 810001, Peoples R China
3.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan
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GB/T 7714
Cui, Xiaoyong,Gu, Song,Wu, Jing,et al. Photosynthetic response to dynamic changes of light and air humidity in two moss species from the Tibetan Plateau[J]. ECOLOGICAL RESEARCH,2009,24(3):645-653.
APA Cui, Xiaoyong,Gu, Song,Wu, Jing,&Tang, Yanhong.(2009).Photosynthetic response to dynamic changes of light and air humidity in two moss species from the Tibetan Plateau.ECOLOGICAL RESEARCH,24(3),645-653.
MLA Cui, Xiaoyong,et al."Photosynthetic response to dynamic changes of light and air humidity in two moss species from the Tibetan Plateau".ECOLOGICAL RESEARCH 24.3(2009):645-653.
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