检索结果-南通市图书馆

Frontiers of Environmental Science & Engineering 2022年第11期16卷 273-275页

作者： Yindong Tong Xuejun Wang James J.Elser School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China College of Urban and Environmental Sciences Peking UniversityBeijing 100871China Flathead Lake Biological Station University of MontanaPolsonMT 59860USA

Eutrophication is the most widespread water quality issue *** date,most efforts to control eutrophication have focused on reductions of external nutrient inputs,yet importance of nutrient stoichiometry and subsequent shift in plankton composition in aquatic ecosystem has been largely *** address eutrophication,improved sanitation is one of the United Nations Sustainable Development Goals,spurring the constructions of wastewater treatment facilities that have improved water quality in many lakes and ***,control measures are often targeted at and effective in removing a single nutrient from sewage and thus are less effective in removing the others,resulting in the changes of nutrient *** general,more effective phosphorus removal relative to nitrogen has occurred in wastewater treatment leading to substantial increases in N/P ratios in effluent relative to the ***,high N/P ratios in receiving waters can impose negative influences on ***,longterm strategies for domestic wastewater management should not merely focus on the total reduction of nutrient discharge but also consider their stoichiometric balances in receiving waters.

关键词： nutrient stoichiometry Wastewater treatment Ecosystem functioning Water quality management

维普期刊数据库

Peanut yield,nutrient uptake and nutrient requirements in different regions of China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2021年第9期20卷 2502-2511页

作者： ZHAO Shi-cheng LÜJi-long XU Xin-peng LIN Xiao-mao Luiz Moro ROSSO QIU Shao-jun Ignacio CIAMPITTI HE Ping Key Laboratory of Plant Nutrition and Fertilizer Ministry of Agriculture and Rural Affairs/Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081P.R.China Department of Agronomy Kansas State UniversityManhattanKS 66506USA

nutrient balance is essential for attaining high yield and improving profits in agricultural farming systems,and crop nutrient uptake ratio and stoichiometry can indicate crop nutrient limitations in the *** collected a large amount of field data to study the variations in yield,nutrient uptake and nutrient stoichiometry of peanut(Arachis hypogaea L.)in Southeast China(SEC),North-central China(NCC),and Northeast China(NEC),during 1993 to *** pod yield gradually increased from 1993 to 2018,with average yields of 4148,5138,and 4635 kg ha–1 in SEC,NCC,and NEC,*** nitrogen(N)internal efficiency(NIE,yield to N uptake ratio)was similar among the three regions,but phosphorus(P)IE(PIE,yield to P uptake ratio)changed from low to high among regions:NCCnutrient IE,to produce 1 Mg of pod yield,the average N,P,and K requirements of the above-ground parts of peanut were roughly 47.2,5.1,and 25.5 kg in SEC,44.8,5.7,and 20.6 kg in NCC,and 44.6,4.4,and 14.7 kg in NEC,*** N/P ratio changed in the sequence NCCnutrient uptake across all regions under high nutrient *** low PIE and N/P ratios in NCC could be explained by the high P accumulation in stover,and high KIE and N/K ratios in NEC may be attributed to the low soil K *** frontier analysis approach provides a practical framework and allows documentation of a decline in nutrient HI as nutrient uptake ***,this study reveals the limitation and surplus of nutrients of peanut in different regions of China.

关键词： peanut pod yield nutrient internal efficiency nutrient stoichiometry harvest index

维普期刊数据库

Harmful algal blooms and eutrophication: "strategies" for nutrient uptake and growth outside the Redfield comfort zone

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2011年第4期29卷 724-738页

作者： Patricia M. GLIBERT JoAnn M. BURKHOLDER University of Maryland Center for Environmental Science Horn Point Laboratory PO Box 775 Cambridge MD 21613 USA Center for Applied Aquatic Ecology North Carolina State University Raleigh NC 27606 USA

While many harmful algal blooms have been associated with increasing eutrophication, not all species respond similarly and the increasing challenge, especially for resource managers, is to determine which blooms are related to eutrophication and to understand why particular species proliferate under specific nutrient conditions. The overall goal of this brief review is to describe why nutrient loads are not changing in stoichiometric proportion to the "Redfield ratio", and why this has important consequences for algal growth. Many types of harmful algae appear to be able to thrive, and/or increase their production of toxins, when nutrient loads are not in proportion classically identified as Redfield ratios. Here we also describe some of the physiological mechanisms of different species to take up nutrients and to thrive under conditions of nutrient imbalance.

关键词： HABs mixotrophy nitrogen nutrient loading nutrient ratios nutrient stoichiometry organicnutrients phosphorus

维普期刊数据库

Alkaline phosphatase as a bio-indicator of phosphorus-eutrophy in freshwater ecosystems: A review

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2023年第3期38卷 349-360页

作者： Madhulika Singh Jitendra Pandey Ganga River Ecology Research Laboratory Environmental Science Division Centre of Advanced Study in Botany Institute of Science Banaras Hindu University

Limnologists have greatly advanced the understanding of indicators of phosphorus(P)-eutrophy in surface waters. Biotic variables such as macro-invertebrates, fish, zooplankton, benthic algae, and diatoms are extensively used for bio-assessment of eutrophy. New concepts highlight the importance of bed-sediment based “response” variables predicting functional shifts during eutrophication. A cross analysis of studies reveals that alkaline phosphatase(ALP), which serves as a proxy of P-deficiency, and also as an indicator of benthic anoxia/hypoxia-driven feedbacks, can be an easy to measure, cost-effective and reliable tool to assess changes in nutrient stoichiometry, trophic status, and ecological functioning at the sediment-water interface. Here, the issues discussed in this paper are highly relevant to explore new domains of research and “response” based ecosystem models for potential eutrophication management decisions. Because ALP is used in molecular cloning and fingerprinting studies, it is suggested that approaches based on the “omics” technologies need to be used to explore more intricate connections to empirically address ALP-P-eutrophy linkages to track eutrophication in freshwater ecosystems.

关键词： Alkaline phosphatase Sediment based-indicators Ecosystem feedback nutrient stoichiometry Phosphorus-eutrophy