Cinese Academy of science

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Cinese Academy of science

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Zhang L.,Xinjiang Institute of Ecology and Geography | Zhang L.,University of Chinese Academy of Sciences | Zhang L.,Cinese Academy of science | Yin L.,Xinjiang Institute of Ecology and Geography | And 2 more authors.
Vegetos | Year: 2013

The purpose of this study was to compare the effect of different concentrations of total petroleum hydrocarbon (TPHs) on plants in laboratory and the greenhouse, including seed germination, seeding survival, plant height, root length, biomass, and evaluate the removal efficiency of TPHs by 8 desert plants (Alhagi sparsifolia, Kalidium foliatum, Nitraria tangutorum, Lycium ruthenicum, Medicago sativa, Tamarix ramosissima, Suaeda altissima and Elaeagnus angustifolia). The results showed that seed germination response is not significant with all species in different treatments (0, 5, 10, 20 g/kg) but seedling survival was more sensitive than germination and all species could survived well in low TPHs contaminated soil. The seedling height, root length and their biomass of all tested plants were significantly reduced in higher concentration of TPHs contaminated soil. The average removal efficiency of TPHs by tested plants over the 120-day culture period was 56.1- 63.6%, 49.5-58.8% and 46.7-57.8% in different contamination concentration, when the removal rate by natural attenuation was 42.1, 41.8 and 37.6%, respectively. This indicated that all tested plants had a peculiar tolerance to petroleum contamination and could effectively degenerate TPHs. In addition, K. foliatum has the highest removal efficiency in 5 g/kg and 10 g/kg concentration of contamination soil. However, the removal efficiency of TPHs of L. ruthenicum in 20 g/kg concentration of contamination soil was higher than other species. Considering of growth and removal efficiency, L. ruthenicum, E. angustifolia and N. tangutorum, widely spread species in Xinjiang, can be effectively applied to phytoremediation of petroleum contaminated soil (≤20 g/kg).


Wang J.J.,CAS Institute of Botany | Wang J.J.,University of Chinese Academy of Sciences | Lai L.M.,CAS Institute of Botany | Lai L.M.,University of Chinese Academy of Sciences | And 11 more authors.
Contemporary Problems of Ecology | Year: 2015

Global warming will stimulate primary production, which is likely to drive shifts in litter production and lead to an increase in carbon (C) inputs to soil. However, the effects of such changes on soil C cycling in subtropical forests remain largely unknown. In a typical subtropical evergreen broadleaved forest in Southwestern China we conducted a controlled experiment that included addition and removal of litter, and trenching. Annual soil respiration in control, trenching, litter addition, and litter removal treatments were 1083.47, 521.50, 1363.30, and 896.15 g C m–2 y–1, respectively. Soil respiration was significantly related to temperature in all treatments, but was independent of soil moisture, except in control plots. Q10 values in control, trenching, litter addition, and litter removal treatments were 3.46, 6.36, 2.72, and 4.85, respectively. Litter addition reduced Q10, but litter removal and trenching increased it. Average heterotrophic soil respiration produced C in the amount equivalent to 48% of the efflux from the soil. Soil respiration in the litter addition treatment was 25% higher than in the control treatment; this increase is about 8% larger than the 17% decrease in soil respiration caused by litter removal. This implies a priming effect on soil respiration. Our results suggest that increases in litter production in response to human disturbances and global warming could have rapid and important consequences on soil respiration in subtropical evergreen broadleaved forests. © 2015, Pleiades Publishing, Ltd.

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