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Home > Papers > Natural-Geography-(including-Chemical-Geography,-Ecological-Geography,-Geomorphology,-ice
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1. Insolation-driven monsoon-mediated changes in Earth's surface processes in mid-latitude East Asia since the last deglaciation | |||
LIU Jianbao,CHEN Qiaomei,XIE Chengling | |||
Earth Science 05 May 2016 | |||
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Abstract:The stability of Earth's critical zone is intimately linked with erosion, chemical weathering and the vegetation type and density, therefore affecting the global biogeochemical processes and in turn the global climate. However, there is a lack of knowledge on how Earth's critical zone processes have changed over time. Here we rebuild erosion-weathering-vegetation interactions since ~14.7 ka using geochemical records of a radiocarbon-dated sediment core from Gonghai Lake in North China. Our results revealed distinct, millennial, late deglacial-Holocene erosion and weathering patterns and transitions. Chemical Index of Alteration (CIA) molar, a humidity proxy, indicated low humidity during the late deglacial ~11.5-14.7 ka, high humidity during the early-mid Holocene ~11.5-3.2 ka, and intermediate humidity during the late Holocene interval since ~3.2 ka. Comparison of our records with other climate reconstructions further suggested an orbital-phased humidity changes in North China. This study provides evidence for the solar-forcing controlled Earth's surface processes in the mid-latitude China under natural climate conditions. | |||
TO cite this article:LIU Jianbao,CHEN Qiaomei,XIE Chengling. Insolation-driven monsoon-mediated changes in Earth's surface processes in mid-latitude East Asia since the last deglaciation[OL].[ 5 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4686394 |
2. Effect of Forest Gaps on the Photosynthetic Physiology of Castanopsis kawakamii seedlings | |||
TANG Rong,HE Zhongsheng,LIU Jinfu,SU Songjin,ZHENG Shiqun,HONG Wei | |||
Earth Science 10 April 2015 | |||
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Abstract:The variations of photosynthetic physiology in plants were the dominant factors that could affected seedlings' dynamic growth. The objective of this study was to explore the effects of weak light on photosynthetic physiology of C.kawakamii seedlings by the measurements of chlorophyll contents, net photosynthetic rate (Pn), and chlorophyll fluorescence in forest gaps and non-gaps. The results showed that: (1) the contents of chlorophyll a (Chl-a), chlorophyll b (Chl-b), and total chlorophyll (total Chl) of C.kawakamii seedlings in forest gaps were lower than those of non-gaps while the value of chlorophyll a/b (Chl-a/b) in forest gaps was higher than that of non-gaps. The increase of Chl-b content improved the absorption of light energy which could conducive to enhance the adaptability of seedlings in non-gaps under the weak light condition, (2) the Pn of C.kawakamii seedlings in forest gaps was higher than those of non-gaps, which showed that the formation of forest gaps could improve seedlings' photosynthetic capacity and promote their growth, and (3) under the weak light condition, the initial fluorescence (Fo) of C. kawakamii seedlings in the low age classes of forest gaps and the high age classes in non-gaps showed an increasing trend. Weak light restrained the seedlings' photochemical efficiency with a downward trend in PSII photochemical conversion efficiency (Fv/Fm) for the low age classes of forest gaps. Photochemical quenching (qP) of C.kawakamii seedlings in forest gaps and non-gaps were sensitive to weak light and demonstrated a decreasing trend. The descending trend of Non-photochemical quenching coefficient (NPQ) for C.kawakamii seedlings in forest gaps was larger than that of non-gaps, which indicated that the decline of heat dissipation capacity constrained the growth of seedlings in forest gaps under the weak light condition. Seedlings in forest gaps could maintain a rapid photosynthetic electron transport rate under the weak light condition. This is due to the actual quantum yield of PSII photochemical (Y) showed a tiny decreasing trend in forest gaps than those of non-gaps. We concluded that weak light condition limited the growth of C.kawakamii seedlings at the low age classes of forest gaps and the high age classes of non-gaps. | |||
TO cite this article:TANG Rong,HE Zhongsheng,LIU Jinfu, et al. Effect of Forest Gaps on the Photosynthetic Physiology of Castanopsis kawakamii seedlings[OL].[10 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4637682 |
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