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1

Composition and distribution of organic carbon in river sediments: a case study of two northern Chinese rivers

100%
Cao Q.-Q., Wang R.-Q., Liu J.
Polish Journal of Environmental Studies
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2015
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tom 24
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nr 3
In order to explore the composition characteristics and distribution pattern of organic carbon (OC) in river sediments, river sediments and riverbank soils were sampled from upstream to downstream of the Majia and Tuhai rivers in northern China, and then determined for heavy fraction organic carbon (HFOC) and light fraction organic carbon (LFOC). Results showed that the HFOC had a significant correlation with LFOC in Majia riverbank sediments or soils, indicating that HFOC and LFOC might have homology and that the Majia River is relatively stable. The distribution pattern of OC is changing irregularly along with rivers. Mean HFOCs in sediments were slightly higher than that in riverbank soils in both studied rivers. Contributions of some other sources of OC that accumulated in sediments might result in better capacity of sediments to OC than soils of riverbank. Our study demonstrated that sediments could accumulate HFOC and LFOC derived from many sources, and had a better capability for the storage of OC, irrespective of HFOC and LFOC.
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Acer truncatum seedlings are more plastic than Quercus variabilis seedlings in response to different light regimes

76%
Guo X., Wang R.-Q., Wang C. D., Xu F., Zhao S., Guo W.-H.
Dendrobiology
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2016
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tom 76
In this study, we investigated responses of the mid-successional species Acer truncatum Bunge and the late-successional species Quercus variabilis Blume to three solar illumination conditions: (1) constant low light (CL), (2) constant high light (CH) and (3) low light first and high light afterwards (LH). The last treatment was to simulate a canopy opening. Both species exhibited increases in biomass, totally and in part, and decreases in leaf water content, specific leaf area and chlorophyll concentrations in LH treatment compared to CL treatment. For A. truncatum, exposure to high light condition (LH) increased crown area, and decreased root to shoot ratio, stem mass ratio and leaf perimeter. However, for Q. variabilis, LH treatment increased stem diameter at ground height, effective quantum yield, photochemical quenching and decreased maximum photosystem II quantum yield. The biomass allocation pattern did not change in Q. variabilis among three light conditions. With respect to newly developed leaves, no significant differences were found in leaf size of Q. variabilis between LH treatment and CH treatment while that of A. truncatum decreased in LH treatment. All chlorophyll fluorescence parameters in newly developed oak leaves in LH treatment increased compared to those of CH treatment while no difference was found for A. truncatum between LH and CH treatment. A. truncatum displayed a greater overall plasticity than Q. variabilis although the oak seedlings have a greater plasticity with respect to chlorophyll concentration and chlorophyll fluorescence parameters. A. truncatum should be a better candidate for vegetation recovery, especially in places with heterogeneous light conditions.
3

Scaling relationships of leaf traits do not change among months in a temperate shrub species

76%
Du N., Wang R.-Q., Zhang X.-R., Xu F., Tan X.-F., Guo W.-H.
Polish Journal of Ecology
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2013
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tom 61
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nr 1
Leaf traits scaling relationships were compared in different months (May, June, July and August) in a temperate shrub species, Vitex negundo Linn. var. heterophylla (Franch.) Rehd. Leaf traits variation and the impact of environment were also studied. Our results showed that specific leaf area (SLA), leaf nitrogen content (Nmass), leaf phosphorus content (Pmass) and leaf chlorophyll content (Chlmass) were positively correlated, and all of the pairwise relationships showed a common standardized major axis (SMA) slope in different months. The variation of SLA, chlorophyll a content (Chlmass a), chlorophyll b content (Chlmass b), Chlmass a/b and maximum quantum yield of PSII (Fv/Fm) were mainly habitat-dependent, while the variation of Pmass and Nmass/Pmass were mainly month-dependent. Redundancy analysis (RDA) was used to further explore the relationships between leaf traits and environmental factors. We found that plants under shade (the relative photosynthetic photon flux density was about 10%) developed light-capturing behavior at leaf level (higher SLA) and cellular level (higher Chlmass/Nmass and lower Chlmass a/b). The increased Nmass/Pmass with month was mainly resulted from the large absorption of soil nitrogen and the decrease of soil pH. In a word, our study indicates that species may not have fundamentally different carbon capture strategies in different months. Variation of different leaf traits are related to different environmental factors in the field.
4

Higher phenotypic plasticity does not confer higher salt resistance to Robinia pseudoacacia than Amorpha fruticosa

76%
Guo X., Ren X.-H., Eller F., Li M.-Y., Wang R.-Q., Du N., Guo W.-H.
Acta Physiologiae Plantarum
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2018
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tom 40
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nr 04
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