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Featured researches published by Bo Guan.


PLOS ONE | 2015

Changes of Soil Particle Size Distribution in Tidal Flats in the Yellow River Delta

Xiaofei Lyu; Junbao Yu; Mo Zhou; Bin Ma; Guangmei Wang; Chao Zhan; Guangxuan Han; Bo Guan; Huifeng Wu; Yunzhao Li; De Wang

Background The tidal flat is one of the important components of coastal wetland systems in the Yellow River Delta (YRD). It can stabilize shorelines and protect coastal biodiversity. The erosion risk in tidal flats in coastal wetlands was seldom been studied. Characterizing changes of soil particle size distribution (PSD) is an important way to quantity soil erosion in tidal flats. Method/Principal findings Based on the fractal scale theory and network analysis, we determined the fractal characterizations (singular fractal dimension and multifractal dimension) soil PSD in a successional series of tidal flats in a coastal wetland in the YRD in eastern China. The results showed that the major soil texture was from silt loam to sandy loam. The values of fractal dimensions, ranging from 2.35 to 2.55, decreased from the low tidal flat to the high tidal flat. We also found that the percent of particles with size ranging between 0.4 and 126 μm was related with fractal dimensions. Tide played a great effort on soil PSD than vegetation by increasing soil organic matter (SOM) content and salinity in the coastal wetland in the YRD. Conclusions/Significance Tidal flats in coastal wetlands in the YRD, especially low tidal flats, are facing the risk of soil erosion. This study will be essential to provide a firm basis for the coast erosion control and assessment, as well as wetland ecosystem restoration.


Scientific Reports | 2016

Distribution of carbon, nitrogen and phosphorus in coastal wetland soil related land use in the Modern Yellow River Delta

Junbao Yu; Chao Zhan; Yunzhao Li; Di Zhou; Yuqin Fu; Xiaojing Chu; Qinghui Xing; Guangxuan Han; Guangmei Wang; Bo Guan; Qing Wang

The delivery and distribution of nutrients in coastal wetland ecosystems is much related to the land use. The spatial variations of TOC, TN, NH4+-N, NO3−-N and TP and associated soil salinity with depth in 9 kinds land uses in coastal zone of the modern Yellow River Delta (YRD) was evaluated based on monitoring data in field from 2009 to 2015. The results showed that the average contents of soil TOC, TN, NO3−-N, NH4+-N and TP were 4.21 ± 2.40 g kg−1, 375.91 ± 213.44, 5.36 ± 9.59 and 7.20 ± 5.58 and 591.27 ± 91.16 mg kg−1, respectively. The high N and C contents were found in cropland in southern part and low values in natural wetland, while TP was relatively stable both in profiles and in different land uses. The land use, land formation age and salinity were important factors influencing distributions of TOC and N. Higher contents of TOC and N were observed in older formation age lands in whole study region, while the opposite regulation were found in new-born natural wetland, indicating that the anthropogenic activities could greatly alter the original distribution regulations of nutrients in coastal natural wetlands by changing the regional land use.


international conference on remote sensing, environment and transportation engineering | 2011

Effects of salt stress and nitrogen application on growth and ion accumulation of Suaeda salsa plants

Bo Guan; Junbao Yu; Xiaobing Chen; Wenjun Xie; Zhaohua Lu

Suaeda salsa is a typical pioneer species which can grow well in high salt environmental conditions. The objective of this study is to evaluate the effect of different levels of salinity (5.25, 10.5 and 21g NaCl per kg soil) and nutrient supply (0, 0.3, 0.6 and 1.2g urea per kg soil) on plant morphology, biomass, accumulation of ions and C/N ratio in leaves of S. salsa. The results showed that the plant height, number of branches, length of branches and diameter of shoot were significantly affected by salt stress, and the nitrogen released the negative effects of salt. The nitrogen treatment increased the biomass of leaf, shoot and root. Leaf water content was significantly affected by the interaction of salt stress and nitrogen treatment. The content of Na+ and Cl− increased significantly as increasing of salt, the content of K+, Ca2+, Mg2+ and SO42− decreased simultaneously to keep ion balance. The C/N ratio decreased significantly as increasing of nitrogen treatment. The content of proline increased significantly with the increasing of salt and nitrogen treatments. The results together indicated that at different salt environment, different amount of nitrogen supply can be used to improve the population growth of S. salsa plants, and the restoration of degraded wetland could be accelerated by nutrient supply reasonably.


Marine Pollution Bulletin | 2017

Effects of hypoxia in the gills of the Manila clam Ruditapes philippinarum using NMR-based metabolomics

Ying Zhang; Huifeng Wu; Lei Wei; Zeping Xie; Bo Guan

Coastal hypoxia affects the survival, behavior, and reproduction of individual local marine organisms, and the abundance, biomass, and biodiversity of coastal ecosystems. In this study, we investigated the chronic effects of hypoxia on the metabolomics in the gills of Ruditapes (R.) philippinarum. The results indicated significant alterations in the metabolite profiles in the gills of the hypoxia-treated clams, in comparison with those maintained under normoxia. The levels of betaine, taurine, glycine, isoleucine, and alanine were significantly reduced, suggesting a disturbance of osmotic balance associated with hypoxia. Meanwhile, metabolites involved in energy metabolism, such as alanine and succinate, were also affected. Dramatic histopathological changes were observed in the gills and hepatopancreases of R. philippinarum grown in hypoxic waters, demonstrating tissue damages apparently caused by long-term exposure to hypoxia. Our findings suggest that hypoxia significantly affects the physiology of R. philippinarum, even at a sub-lethal level, and impedes health of the clams.


Environmental Earth Sciences | 2014

The spatial distribution characteristics of soil salinity in coastal zone of the Yellow River Delta

Junbao Yu; Yunzhao Li; Guangxuan Han; Di Zhou; Yuqin Fu; Bo Guan; Guangmei Wang; Kai Ning; Huifeng Wu; Jihong Wang


Environmental Management | 2012

Vegetative Ecological Characteristics of Restored Reed (Phragmites australis) Wetlands in the Yellow River Delta, China

Xuehong Wang; Junbao Yu; Di Zhou; Hongfang Dong; Yunzhao Li; Qianxin Lin; Bo Guan; Yongli Wang


Clean-soil Air Water | 2011

Physiological Responses of Halophyte Suaeda salsa to Water Table and Salt Stresses in Coastal Wetland of Yellow River Delta

Bo Guan; Junbao Yu; Xuehong Wang; Yuqin Fu; Xingyan Kan; Qianxin Lin; Guangxuan Han; Zhaohua Lu


Clean-soil Air Water | 2012

Effects of Salinity and Water Depth on Germination of Phragmites australis in Coastal Wetland of the Yellow River Delta

Junbao Yu; Xuehong Wang; Kai Ning; Yunzhao Li; Huifeng Wu; Yuqin Fu; Di Zhou; Bo Guan; Qianxin Lin


Clean-soil Air Water | 2014

Spatiotemporal Distribution Characteristics of Soil Organic Carbon in Newborn Coastal Wetlands of the Yellow River Delta Estuary

Junbao Yu; Hongfang Dong; Yunzhao Li; Huifeng Wu; Bo Guan; Yongjun Gao; Di Zhou; Yongli Wang


Clean-soil Air Water | 2013

Status of Macrobenthic Community and Its Relationships to Trace Metals and Natural Sediment Characteristics

Ying Zhang; Zhenbo Lv; Bo Guan; Yuanjin Liu; Fan Li; Yuanqing Ma; Junbao Yu; Yunzhao Li

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Junbao Yu

Chinese Academy of Sciences

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Yunzhao Li

Chinese Academy of Sciences

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Guangxuan Han

Chinese Academy of Sciences

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Di Zhou

Chinese Academy of Sciences

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Huifeng Wu

Chinese Academy of Sciences

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Guangmei Wang

Chinese Academy of Sciences

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Xuehong Wang

Chinese Academy of Sciences

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Yuqin Fu

Chinese Academy of Sciences

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Hongfang Dong

Chinese Academy of Sciences

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Yongli Wang

Chinese Academy of Sciences

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