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Zhao B.,South China Agricultural University | Zhao B.,Key Laboratory of Agro Ecology and Rural Environment of Guangdong Regular Higher Education Institutions | Zhang J.-E.,South China Agricultural University | Zhang J.-E.,Key Laboratory of Agro Ecology and Rural Environment of Guangdong Regular Higher Education Institutions | And 4 more authors.
Desalination and Water Treatment | Year: 2016

Golden apple snail (GAS) is one of the 100 worst invasive alien species. With the application of molluscicides to kill and control the spreading of these snails, a large amount of dead GAS shells are remained in many farms. This study ascertained the characteristics and removal of cadmium (Cd) by the GAS shell (GASS) powders and the associate mechanisms. Results showed that when the concentration of shell powder increased from 0.05 to 10.00 g/L, pH from 1.5 to 5.5, contact time from 2 to 100 min, and temperature from 10 to 50°C, the Cd removal efficiency from the solution increased gradually and reached an equilibrium condition. The Cd removal efficiency decreased as the initial Cd concentration increased from 5 to 500 mg/L. The changes in the amount of Cd removal conformed to the Langmuir model with a capacity of 81.301 mg/g. A thermodynamic analysis indicated that the Cd removal by the GASS powder was an endothermic and spontaneous process. Our study also revealed that the solution pH was affected greatly by the amount of GASS powder. The powder X-ray diffractometer (XRD) and scanning electron microscopy indicated that the CdCO3 precipitated on the surface of GAS shells. The Cd removal was related to the ion exchange and the micro-precipitation with a depletion of aragonite and calcite. This study suggests that shells of GAS could be used as an effective biomaterial for Cd removal from contaminated water. © 2016 Balaban Desalination Publications. All rights reserved. Source


Ye Y.-Q.,South China Agricultural University | Ye Y.-Q.,Key Laboratory of Agro Ecology and Rural Environment of Guangdong Regular Higher Education Institutions | Li Y.-M.,South China Agricultural University | Li Y.-M.,Key Laboratory of Agro Ecology and Rural Environment of Guangdong Regular Higher Education Institutions | And 2 more authors.
Chinese Journal of Applied Ecology | Year: 2011

Based on the 1996, 2000, 2004, and 2008 statistical data of Guangzhou City, and by the methods of marketing valuation, shadow price, afforestation cost, carbon tax, and industrial oxygen-producing, this paper calculated the related service values of various agroecosystems in Guang-zhou, and assessed the changes of agroecosystem service value during the rapid urbanization of the City. In 1996-2008, though the service values of farmland, grassland, and water ecosystems had somewhat increase, the overall agroecosystem service value of Guangzhou decreased, mainly due to the more decrease of forest ecosystem service value which occupied more than 90% of the total service value each year. Over the studied period, the proportion of each individual functional service value to the total service value changed little, and the contribution of each individual functional service value was in the order of climate regulation > gases regulation > product service > waste treatment > soil conservation > biodiversity conservation > recreation and culture > water source retention and storage. The sum of climate regulation and gases regulation service values took over 91% of the total agroecosystem service value. There was a significant negative correlation(R = -0.905,P<001)between urbanization rate and total agroecosystem service value, suggesting that the increase of urbanization rate would lead to a decrease of agroecosystem service value. Therefore, it requires an appropriate reservation of various agroecosystems to maintain the regional sustainable development during urbanization. Source


Zhao B.,South China Agricultural University | Zhao B.,Key Laboratory of Agro Ecology and Rural Environment of Guangdong Regular Higher Education Institutions | Zhang J.-E.,South China Agricultural University | Zhang J.-E.,Key Laboratory of Agro Ecology and Rural Environment of Guangdong Regular Higher Education Institutions | And 7 more authors.
Agroecology and Sustainable Food Systems | Year: 2015

Rice–duck farming is a sustainable food system that provides rice and duck meat and eggs. Excessive application of commercial feedstuff for ducks weakens the sustainability of rice–duck farming. This study aims to investigate green forage (Lolium multiflorum Lam.) as a substitute for commercial grain mix, to attain a maximum economic benefit and pollution-free production in rice–duck farming. The effects of a mixed feedstuff of green forage and commercial grain mix with a stable ratio of 1:4 (MFSR), mixture feedstuff of green forage and commercial grain mix with dynamic ratios (MFDR), and full commercial grain mix (FCGM) were studied. Results showed that Cherry Volley and hybrid ducks were more adaptable to mixed feedstuff than Mud ducks. Growth of ducks was classified into rapid, slow and steady-growth stages. The weight, body length, neck length, and chest circumference of ducks that were fed MFDR were only slightly decreased. The carcass weight, eviscerated weight, and semi-eviscerated weight of ducks fed MFDR were similar to those fed FCGM. MFDR significantly decreased duck fat accumulation. MFDR did not have negative impacts on the agronomic traits of rice yields. Duck profits per 667 m2 were calculated as CNY (Chinese Yuan) 254.91 (MFSR), CNY309.27 (MFDR), and CNY39.36 (FCGM). MFDR effectively improved the rice–duck farming. Copyright © Taylor & Francis Group, LLC. Source


Ye Y.-Q.,South China Agricultural University | Ye Y.-Q.,Key Laboratory of Agro Environment in the Tropics | Ye Y.-Q.,Key Laboratory of Agro Ecology and Rural Environment of Guangdong Regular Higher Education Institutions | Zhang J.-E.,South China Agricultural University | And 11 more authors.
Chinese Journal of Ecology | Year: 2013

Based on the hydrological, water quality, and other associated statistic data in 2005-2010, and by using different approaches such as marketing valuation and alternative engineering method, this paper evaluated the functions and values of aquatic ecosystem services in Guangzhou City of South China. During the study period, the aquatic ecosystem services value in Guangzhou presented an "increasing-decreasing-increasing" trend, being 749.64 × 108, 878.60 × 108, 711.98×108, 879.07×108, 699.62×108, and 848.67×108 Yuan • a-1 in 2005, 2006, 2007, 2008, 2009, and 2010, respectively. The proportion of each kind functional service value to the total services value changed slightly over the years, and the contribution of each kind functional service value was in the order of water storage > water supply > aquatic products > tourism > flood control > water purification > hydro-power > transportation > sand transport. The ratio of the aquatic ecosystem services value to the GDP in the same years was 14.54%, 14.47%, 9.97%, 10.61%, 7.66%, and 7.90%, respectively, which greatly surpassed the ratio of the China's aquatic ecosystem services to the national GDP. The yearly total aquatic ecosystem services value had a significant correlation (r =0.973, P =0.001) with the yearly total amount of water resources, but less correlation (r =-0.119, P =0.843) with the GDP in Guangzhou. Source

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