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Effects of acid deposition control in China:a review based on responses of subtropical forests
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作者 danni xie Xiaodong Ge +1 位作者 Lei Duan Jan Mulder 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2024年第6期115-126,共12页
For many decades,acid deposition used to pose a significant regional air pollution challenge in China.After substantial emission control of anthropogenically derived sulfur and nitrogen containing gasses,both sulfur a... For many decades,acid deposition used to pose a significant regional air pollution challenge in China.After substantial emission control of anthropogenically derived sulfur and nitrogen containing gasses,both sulfur and nitrogen deposition,as well as the acid rain-affected area,have significantly decreased compared to their peak levels.Forests,particularly in the humid subtropics,are sensitive to acid deposition,as evidenced by soil acidification,sulfate and nitrate leaching in stream water,and elevated soil nitrous oxide emission.Reduction in the total deposition of sulfur and nitrogen,caused a significant decline in sulfate and nitrate leaching from subtropical forest and subsequently in sulfate and nitrate concentrations in stream water,although there was about a 5-year delay.This delay may be attributed to the desorption of accumulated sulfate and continued elevated mineralization of accumulated nitrogen pools.Emissions of nitrous oxide,a potent greenhouse gas,also declined in nitrogen-saturated subtropical forest soils,as soil water nitrate concentration decreased.Therefore,subtropical forests in China suffering from elevated acid deposition have begun to recover.Yet,the current levels of sulfur and nitrogen deposition continue to exceed the critical loads,i.e.,the assigned threshold levels in accordance with emission control policies,in more than 10%of the country’s land area,respectively,indicating remaining risks of acidification and eutrophication.Thus,further emission reductions are urgently needed,also because they will help achieving goals related to air quality and nitrous oxide emissions. 展开更多
关键词 ACIDIFICATION Critical load Nitrous oxide Surface water chemistry RECOVERY
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Enzymatic Hydrolysis Lignin(EHL)and its applications for value-added products,a quick review
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作者 danni xie Chuanling Si Dan Huo 《Journal of Bioresources and Bioproducts》 EI 2017年第4期177-183,共7页
Enzymatic hydrolysis lignin(EHL)has a variety of active groups,which endow it with excellent properties and broad application prospects.Research work on EHL will promote better utilization of lignin resources and sust... Enzymatic hydrolysis lignin(EHL)has a variety of active groups,which endow it with excellent properties and broad application prospects.Research work on EHL will promote better utilization of lignin resources and sustainable development of ecological environment.This paper briefly reviewed the research progress on EHL structures,properties,modifications and applications.Future research and development on EHL were also discussed. 展开更多
关键词 Enzymatic hydrolysis lignin Wood adhesive Polyurethane foam DISPERSANT Heavy metal ions adsorbent RUBBER ANTIOXIDANT
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