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Now showing items 1 - 16 of 60

  • The response of soil bacterial communities to mining subsidence in the west China aeolian sand area

    Shi, Peili   Zhang, Yuxiu   Hu, Zhenqi   Ma, Kang   Wang, Hao   Chai, Tuanyao  

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  • Using Soil Survey Database to Assess Soil Quality in the Heterogeneous Taihang Mountains, North China

    Geng, Shoubao   Shi, Peili   Zong, Ning   Zhu, Wanrui  

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  • Large-scale estimation and uncertainty analysis of gross primary production in Tibetan alpine grasslands

    He, Honglin   Liu, Min   Xiao, Xiangming   Ren, Xiaoli   Zhang, Li   Sun, Xiaomin   Yang, Yuanhe   Li, Yingnian   Zhao, Liang   Shi, Peili   Du, Mingyuan   Ma, Yaoming   Ma, Mingguo   Zhang, Yu   Yu, Guirui  

    Gross primary production (GPP) is an important parameter for carbon cycle and climate change research. Previous estimations of GPP on the Tibetan Plateau were usually reported without quantitative uncertainty analyses. This study sought to quantify the uncertainty and its partitioning in GPP estimation across Tibetan alpine grasslands during 2003-2008 with the modified Vegetation Photosynthesis Model (VPM). Monte Carlo analysis was used to provide a quantitative assessment of the uncertainty in model simulations, and Sobol' variance decomposition method was applied to determine the relative contribution of each source of uncertainty to the total uncertainty. The results showed that the modified VPM successfully reproduced the seasonal dynamics and magnitude of GPP of 10 flux tower sites on the plateau (R-2=0.77-0.95, p<0.001). The 6 year mean GPP in Tibetan alpine grasslands was estimated at 223.3 Tg C yr(-1) (312.3g C m(-2)yr(-1)). The mean annual GPP increased from western to eastern plateau, with the increase of annual temperature and precipitation and the decrease of elevation, while the decrease of GPP from southern to northern plateau was primarily driven by air temperature. Furthermore, the mean relative uncertainty of the annual GPP was 18.30%, with larger uncertainty occurring in regions with lower GPP. Photosynthetic active radiation, enhanced vegetation index, and the maximum light use efficiency (LUE) are the primary sources of uncertainty in GPP estimation, contributing 36.84%, 26.86%, and 21.99%, respectively. This emphasizes the importance of uncertainty in driving variables as well as that of maximum LUE in LUE model simulation. Key Points A methodology for regional GPP estimation and uncertainty analysis was evaluated The 6-year GPP in Tibetan grasslands are estimated using modified VPM model The uncertainty of modeled GPP is quantified and traced to specific model input
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  • Spatial–Temporal Variation of ANPP and Rain-Use Efficiency Along a Precipitation Gradient on Changtang Plateau, Tibet

    Zhao, Guangshuai   Liu, Min   Shi, Peili   Zong, Ning   Wang, Jingsheng   Wu, Jianshuang   Zhang, Xianzhou  

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  • Nitrogen addition stimulated compensatory growth responses to clipping defoliation in a Northern Tibetan alpine meadow

    Zong, Ning   Shi, Peili  

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  • Effect of heavy-metal on synthesis of siderophores by\r Pseudomonas aeruginosa\r ZGKD3

    Shi, Peili   Xing, Zhukang   Zhang, Yuxiu   Chai, Tuanyao  

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  • Lead contamination in Chinese surface soils: Source identification, spatial-temporal distribution and associated health risks

    Zhang, Yunhui   Hou, Deyi   O’Connor, David   Shen, Zhengtao   Shi, Peili   Ok, Yong Sik   Tsang, Daniel C. W.   Wen, Yang   Luo, Mina  

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  • Growth and Cadmium Accumulation ofSolanum nigrumL. Seedling were Enhanced by Heavy Metal-Tolerant Strains ofPseudomonas aeruginosa

    Shi, Peili   Zhu, Kangxing   Zhang, Yuxiu   Chai, Tuanyao  

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  • Carbon flux phenology and net ecosystem productivity simulated by a bioclimatic index in an alpine steppe-meadow on the Tibetan Plateau

    Chai, Xi   Shi, Peili   Song, Minghua   Zong, Ning   He, Yongtao   Zhao, Guangshai   Zhang, Xianzhou  

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  • Enhanced Community Production rather than Structure Improvement under Nitrogen and Phosphorus Addition in Severely Degraded Alpine Meadows

    Zong, Ning   Shi, Peili  

    Fertilization is a common management measure for the restoration of degraded grasslands. In order to investigate whether fertilization can improve the severely degraded alpine meadows, we conducted a fertilization experiment on the Tibetan Plateau that began in 2008. The treatments were nitrogen (N) addition alone (50 kg N ha(-1) year(-1), LN; 100 kg N ha(-1) year(-1), HN) or combined with phosphorus (P) fertilizer [(50 kg N + 50 kg P) ha(-1) year(-1), LN+P; (100 kg N + 50 kg P) ha(-1) year(-1), HN + P] in a severely degraded alpine meadow. Eleven consecutive years of N and P fertilization did not significantly change plant species richness, while fertilization reduced the plant species diversity index, with the most significant reduction in HN and HN + P treatments. LN + P and HN + P treatments greatly increased community coverage and aboveground biomass, while N addition alone, especially the HN treatment, significantly reduced community coverage and aboveground biomass. Fertilization had no effect on edible pastures, while N and P fertilization significantly increased the biomass of forbs. The proportion of forbs to total aboveground biomass was more than 90%, and fertilization had no effect on this proportion. This shows that forbs still have an absolute advantage in the community. In addition, HN, LN + P, and HN + P treatments significantly reduced ecosystem stability. Community aboveground biomass was greatly enhanced in the N and P fertilization treatments, and this was beneficial for the ecosystem quality and soil hydrological functioning. However, fertilization treatments did not improve the community structure with either N addition alone or combined with P fertilizer, which was of little significance in providing forages for the sustainable development of livestock husbandry. To improve the structure of severely degraded alpine grasslands, it is necessary to combine other measures such as cutting the roots of forbs, fencing, or reseeding.
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  • Lead contamination in Chinese surface soils:Source identification,spatial-temporal distribution and associated health risks

    Zhang, Yunhui   Hou, Deyi   O'Connor, David   Shen, Zhengtao   Shi, Peili   Ok, Yong Sik   Tsang, Daniel C. W.   Wen, Yang   Luo, Mina  

    Soil lead (Pb) pollution is wide spread in China. The Chinese government is taking ambitious actions to tackle the soil pollution issue, with the latest soil quality standards and the Soil Pollution Prevention and Remediation Law enacted in 2018. This study assesses the spatio-temporal distribution, pollution levels, major sources and health risks of Pb in surface soils in China in the past three decades (1990-2017). Traffic emissions (mainly leaded gasoline), mining, smelting, and e-waste recycling were main contributors to soil Pb pollution and pose a risk to food security and human health. The weighted arithmetic mean of Pb concentrations was 35.9 +/- 0.21 mg/kg. Southern China suffered from severer soil Pb pollution with hotspots of the Pearl River Delta, Yangtze River Delta, Shaanxi and Hunan. The average soil Pb concentration increased marginally during 1990-2001 due to increased industrial and transportation activities; afterwards, it decreased by similar to 30% during 2001-2013, reflecting the effectiveness of the ban on leaded gasoline in 2000. However, there was a slight increase in recent years. Therefore, it is critical to establish a comprehensive evaluation and monitoring system, strengthen pollution source control, properly manage the environmental and health risks at severely contaminated sites, and conduct green and sustainable remediation.
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  • Attribute parameter characterized the seasonal variation of gross primary productivity (alpha(GPP)):Spatiotemporal variation and influencing factors

    Zhang, Weikang   Yu, Guirui   Chen, Zhi   Zhang, Leiming   Wang, Qiufeng   Zhang, Yangjian   He, Honglin   Han, Lang   Chen, Shiping   Han, Shijie   Li, Yingnian   Sha, Liqing   Shi, Peili   Wang, Huimin   Wang, Yanfen   Xiang, Wenhua   Yan, Junhua   Zhang, Yiping   Zona, Donatella   Arain, M. Altaf   Maximov, Trofim   Oechel, Walter   Kosugi, Yoshiko  

    The seasonal dynamic of gross primary productivity (GPP) has influences on the annual GPP (AGPP) of the terrestrial ecosystem. However, the spatiotemporal variation of the seasonal dynamic of GPP and its effects on spatial and temporal variations of AGPP are still poorly addressed. In this study, we developed a parameter, alpha(GPP), defined as the ratio of mean daily GPP (GPP(mean)) to the maximum daily GPP (GPP(max)) during the growing season, to analyze the seasonal dynamic of GPP based on Weibull function. The alpha(GPP) was a comprehensive parameter characterizing the shape, scale, and location of the seasonal dynamic curve of GPP. We calculated aGPP based on the data of GPP for 942 site-years from 115 flux sites in the Northern Hemisphere, and analyzed the spatiotemporal variation and influencing factors of the aGPP. We found that the aGPP of terrestrial ecosystems in the Northern Hemisphere ranged from 0.47 to 0.85, with an average of 0.62 +/- 0.06. The aGPP varied significantly both among different climatic zones and different ecosystem types. The alpha(GPP) was stable on the interannual scale, while decreased as latitude increased, which was consistent across different ecosystem types. The spatial pattern of the seasonal dynamic of astronomical radiation was the dominating factor of the spatial pattern of alpha(GPP), that was, the spatial pattern of the seasonal dynamic of astronomical radiation determined that of the seasonal dynamic of GPP by controlling that of seasonal dynamics of total radiation and temperature. In addition, we assessed the spatial variation of AGPP preliminarily based on alpha(GPP) and other seasonal dynamic parameters of GPP, indicating that the understanding of the spatiotemporal variation of alpha(GPP) could provide a new approach for studying the spatial and temporal variations of AGPP and estimating AGPP based on the seasonal dynamic of GPP.
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  • Experimental warming does not enhance gross primary production and above-ground biomass in the alpine meadow of Tibet

    Fu, Gang   Zhang, Xianzhou   Zhang, Yangjian   Shi, Peili   Li, Yunlong   Zhou, Yuting   Yang, Pengwan   Shen, Zhenxi  

    In order to understand the response of gross primary production (GPP) and above-ground biomass (AGB) to warming, a field warming experiment using open-top chambers was conducted in an alpine meadow at three elevations (i.e., 4313, 4513, and 4693 m) on the Northern Tibetan Plateau in May 2010. We calculated GPP from the moderate-resolution imaging spectroradiometer algorithm and AGB using the surface measured data in 2012. Average GPP and AGB at elevation 4313 m was significantly decreased by experimental warming, whereas the declines at elevations 4513 and 4693 m were not statistically significant across all sampling dates. The negative effects of experimental warming on GPP and AGB may be related to experimental warming-induced soil drying. The different responses of GPP and AGB to experimental warming among the three alpine meadow sites could be dependent on climate conditions. Our findings suggested that experimental warming did not enhance GPP and AGB in the alpine meadow, and its effects differed among alpine meadows on the Tibetan Plateau. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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  • Quinoline-degrading strain Pseudomonas aeruginosa KDQ4 isolated from coking activated sludge is capable of the simultaneous removal of phenol in a dual substrate system.

    Zhang, Panhong   Jia, Rong   Zhang, Yuxiu   Shi, Peili   Chai, Tuanyao  

    Quinoline is a refractory organic compound in the treatment of coking wastewater. The isolation of high efficiency quinoline-degrading bacteria from activated sludge and the evaluation of their degradation characteristics in the presence of phenol or in the actual coking wastewater are important for the improvement of effluent quality. The novel bacterial strain Pseudomonas aeruginosa KDQ4 was isolated from a quinoline enrichment culture obtained from the activated sludge of a coking wastewater treatment plant. The optimum temperature and initial pH for quinoline degradation were 33-38=C2=B0C and 8-9, respectively. KDQ4 completely degraded 400mg/L of quinoline within 24h and 800mg/L of phenol within 30h. In the dual-substrate system, the removal efficiencies of quinoline and phenol at the same initial concentration (200mg/L) by KDQ4 were 89% and 100% within 24h, respectively, indicating that KDQ4 could simultaneously and quickly degrade quinoline and phenol in a coexistence system. Moreover, KDQ4 was able to adapt to actual coking wastewater containing high quinoline and phenol concentrations and rapidly remove them. KDQ4 also exhibited heterotrophic nitrification and aerobic denitrification potential under aerobic conditions. These results suggested a potential bioaugmentation role for KDQ4 in the removal of nitrogen-heterocyclic compounds and phenolics from coking wastewater. =20
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  • Effects of national ecological restoration projects on carbon sequestration in China from 2001 to 2010.

    Lu, Fei   Hu, Huifeng   Sun, Wenjuan   Zhu, Jiaojun   Liu, Guobin   Zhou, Wangming   Zhang, Quanfa   Shi, Peili   Liu, Xiuping   Wu, Xing   Zhang, Lu   Wei, Xiaohua   Dai, Limin   Zhang, Kerong   Sun, Yirong   Xue, Sha   Zhang, Wanjun   Xiong, Dingpeng   Deng, Lei   Liu, Bojie   Zhou, Li   Zhang, Chao   Zheng, Xiao   Cao, Jiansheng   Huang, Yao   He, Nianpeng   Zhou, Guoyi   Bai, Yongfei   Xie, Zongqiang   Tang, Zhiyao   Wu, Bingfang   Fang, Jingyun   Liu, Guohua   Yu, Guirui  

    The long-term stressful utilization of forests and grasslands has led to ecosystem degradation and C loss. Since the late 1970s China has launched six key national ecological restoration projects to protect its environment and restore degraded ecosystems. Here, we conducted a large-scale field investigation and a literature survey of biomass and soil C in China's forest, shrubland, and grassland ecosystems across the regions where the six projects were implemented (16% of the country's land area). We investigated the changes in the C stocks of these ecosystems to evaluate the contributions of the projects to the country's C sink between 2001 and 2010. Over this decade, we estimated that the total annual C sink in the project region was 132 Tg C per y (1 Tg =3D 1012 g), over half of which (74 Tg C per y, 56%) was attributed to the implementation of the projects. Our results demonstrate that these restoration projects have substantially contributed to CO2 mitigation in China.=20
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  • End of season carbon supply status of woody species near the treeline in western China

    Shi, Peili   Koerner, Christian   Hoch, Guenter  

    As trees and shrubs approach the high elevation tree limit, it is often assumed that they fall short in photosynthate (source [imitation). Alternatively, tow temperature may restrict carbon investment (growth, sink Limitation). The content of mobile nonstructural. carbohydrates (NSC) in tissues is considered a measure of the carbon source-sink balance. To test the source vs. sink Limitation hypothesis, we compared tate-season NSC concentrations of various woody taxa. across attitudinal gradients from the subalpine forest to the treeline at the eastern edge of the Tibetan Plateau. Since we were interested in the generality of trends, we present "community" trends across four taxa, namely Quercus aquifolioides, Abies faxoniana, Rhododendron fabri subsp. prattii and Sorbus rufopilosa. NSC concentrations increased significantly with attitude in branch wood, current-year and last-year leaves, while there were no significant trends in stem sapwood and root xylem. The sugar to starch ratio was roughly 1:1 in branches and evergreen leaves, white stems and roots showed a higher starch fraction. Analyses of total nitrogen in leaves and wood tissues indicated no change in the trees' nitrogen supply with elevation. The overall attitudinal. trends of NSC in this group of woody plant species revealed no depletion of carbon reserves near the tree Limit, suggesting that sink limitation predominates woody plant Life across this treeline ecotone community.. (c) 2005 Published by Elsevier GmbH on behalf of Gesellschaft fur Okologie.
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