Results 41 to 50 of about 2,463 (159)
Read the free Plain Language Summary for this article on the Journal blog. Abstract Interactions between plants and soil microorganisms in the rhizosphere are vital for maintaining the nutrient cycle and stability of terrestrial ecosystems. Nitrogen, closely related to carbon (C) cycling and ecosystem productivity, undergoes transformation by soil ...
Ru Wang +9 more
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China's Eco‐Civilisation, Climate Leviathan, and Hobbesian Energy Transition
Abstract Scholars have hitherto tended to theorise China's ecological civilisation project either as a form of environmental authoritarianism or as a vision of eco‐socialism. This paper contributes to the conversation by conducting a textual analysis of Chinese scholarly discussions on eco‐civilisation.
David Chen
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以内蒙古河套灌区苏打碱化土为研究对象开展田间试验,设置常规施肥(CK)、生物炭+常规施肥(BC)、牛粪+常规施肥(CD)、玉米秸秆+常规施肥(SW)和羊粪+常规施肥(GM)5个处理,研究不同有机物料添加对碱化土壤有机碳(SOC)库和化学性质的影响。分别于2019年和2020年收获季采集0—30 cm耕层土壤,分析不同有机物料添加下SOC及其活性碳组分和主要盐碱指标的变化特征及其相关关系。结果表明:与CK相比,2019年和2020年各有机物料添加处理下SOC平均增幅分别为22.7%和17.2 ...
张月鲜 +6 more
doaj
Study of the Diversity of Exopolysaccharide-producing Bacteria in South China Sea and the Bioavailability of Representative Bacterial Exopolysaccharide [PDF]
海洋溶解有机物质(DOM)在海洋碳的生物地球化学循环中占有重要地位。储存在DOM中的碳可以与大气中的CO2相当,是海洋最大的有机碳库。海洋细菌生产的胞外多糖(EPS)是高分子量的糖类聚合物,是重要的DOM成分之一。EPS不仅为微生物提供适于其生存活的微环境,同时参与海洋中各个生物化学过程,对海洋物质与能量循环具有重要生态意义。海洋细菌普遍具有合成分泌胞外多糖的能力,然而海洋细菌生产的EPS对DOM的贡献尚不明确。关于EPS生产菌株的报道目前主要集中在从极地、热泉、冷泉等极端环境地区分离出来的菌株 ...
陈弋
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Plant nutrient‐acquisition strategies contribute to species replacement during primary succession
Pioneer species Hippophae acquires phosphorus and nitrogen mainly by ‘mining’ and N2‐fixing strategies and thus dominates in the beginning of primary succession. As soil nutrient availability increases with the mobilization of apatite‐P and input of N‐rich plant residues, Hippophae' strategies become less efficient than Populus's scavenging strategies.
Xiao‐Long Li +12 more
wiley +1 more source
为了解若尔盖高寒草地沙化对土壤活性有机碳组分的影响,采用空间代替时间的方法,通过野外土壤采集,并结合室内化验分析,研究了若尔盖高寒草原不同沙化阶段土壤有机碳及其活性组分的含量和变化特征。结果表明:沙化对高寒草地0—60 cm土层土壤有机碳含量具有显著影响,随沙化程度加剧,土壤总有机碳、溶解性有机碳、易氧化有机碳和微生物量碳含量均呈现显著下降的特征,极重度沙化阶段较潜在沙化阶段分别减少了74.76%,80.24%,76.02%和83.24%;活性有机碳组分的损失较土壤总有机碳明显 ...
费 凯 +5 more
doaj
On the dissolved carbohydrates and the decompositon of dissolved organic matter in the Pearl River estuary, China [PDF]
碳水化合物是生物圈中分布最广的生化物质,也是构成溶解有机物(DOM)的最不稳定的组分之一。本文调查了珠江口夏季(2005年8月)和春季(2006年3月)水体中溶解单糖、多糖及总糖浓度。针对珠江口上游区域常年存在的表层缺氧现象,通过在暗条件下DOM降解的现场培养实验,研究上游区DOM的可利用性、特别是DOM的降解及耗氧情况。 夏季上游单糖浓度范围4.5~36.0μMC,占溶解有机碳(DOC)比例范围3~7%,多糖浓度范围14.9~103.7μMC,占DOC比例范围8~22%,总糖浓度范围20.5~139 ...
陈洪梅
core
主要分析不同森林植被下有机碳的分解动态和土壤碳库各组分大小、周转时间。结果表明:土壤样品培养90天,CO2累计释放量表层大致为1723~5065mg/kg、下层大致为178~642mg/kg。分解速率总的趋势是前期快,后期慢,表层明显大于下层。大小顺序为:冷杉林〉针阔混交林和阔叶林〉针叶林。在不同植被下的表层和下层土壤中,活性碳占总有机碳的0.54%~1.67%,0.45%~5.48%.平均驻留时间为11~56天、60~88天;缓效性碳占总有机碳的23.0%~63.3%,33.2%~72.2 ...
邵月红 +3 more
doaj +2 more sources
微生物是驱动海洋元素循环的主体,在调节全球气候变化中起着重要作用.近半个世纪海洋研究的一个谜团就是"为什么有着一个相当于大气CO2碳总量的惰性溶解有机碳(Recalcitrant Dissolved Organic Carbon, RDOC)库在海洋中长期存在?".生物泵(Biological Pump, BP)和微食物环(Microbial Loop, ML)研究加深了我们对生物在海洋碳循环中作用的理解,但直到微型生物碳泵(Microbial Carbon Pump, MCP)理论的提出 ...
刘纪化, 孙军, 张传伦, 蔡阮鸿
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Evolution Characteristics of Soil and Water Conservation Carbon Pool and Its Carbon Sink Potential in Typical Small Watershed of the Loess Plateau [PDF]
[Objective] To investigate the evolution of soil carbon pool under catchment scale integrated soil and water conservation measures and evaluate the potential of soil and water conservation carbon sink. [Methods] Typical small watershed for soil and water
DONG Pengbei +5 more
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