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浏览/检索结果: 共5条，第1-5条 帮助 限定条件 内容类型：学位论文     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 基于高分辨质谱的土壤溶解性有机质化学多样性研究 学位论文 北京: 中国科学院生态环境研究中心, 2018 作者:  李晓明 收藏  |  浏览/下载：24/0  |  提交时间：2020/07/15 土壤溶解性有机质， 化学多样性，微生物多样性， 傅立叶变换离子回旋 共振质谱  decreased WIth IncreasIng Iron ComplexIng Index. PAtterns In Molecular PrOfiles IndicAted Dom In Paddy Soils To Become More RecalcItrAnt At Higher Soil C/n rAtio And Higher Soil Ph. furTherMore, PlAnt-derived polyPh.nols And Pyrogenic Dom Were retaIned Favorably By Iron And The ChemodiversIty Of Dom In Paddy Soil Increased WIth IncreasIng Soil C/n rAtios. These Results Provide Novel InFormAtion regardIng Dom Characteristics At a Molecular Level And Will InForm Better Global MAnagement Of Soil Carbon In Paddy Soil EcosysteMs Global. 2) Through The applicAtion Of Ft-icr-Ms, The ChemodiversIty Of Dom In Soil Subjected To Long-term OrgAnic Carbon And InOrgAnic Fertilizer Amendments Was Established. In Parallel, Bcc Was Assessed. Through This Coupled Approach It Was Established.thAt sustaIned OrgAnic Carbon Amendment Resulted In: SignificAntly (p < 0.05) Increased Total Carbon And Total nItrogen Reservoirs In Soil, Dom PrOfiles Of greAter ChemodiversIty, And Emergence Of RecalcItrAnt Dom Moieties (H/c < 1.5). In Contrast, Carbon And nItrogen Reservoirs In Soil Subjected To sustaIned InOrgAnic Fertilizer applicAtion Were Unaltered, While Soil OrgAnic Carbon ChemodiversIty Was Observed To Shift To Less RecalcItrAnt Dom Moieties (H/c rAtio > 1.5 And O/c rAtios < 0.5). furTherMore, sustaIned OrgAnic Carbon Amendment Shaped Bcc To a eutroPh.c stAte While Long-term Chemical fertilizAtion Directed The Bcc Towards An oligotroPh.c stAte. Higher connectivIty And Network complexIty Were Observed In OrgAnic Carbon Amended Soils. Dom-Bcc Network Analysis, IndicAtIng thAt Soil Microbes Had More Interaction WIth Dom Molecules followIng sustaIned OrgAnic mAtter Input. These Results Highlight The Potential For OrgAnic Carbon Amendments To Not Only Build Soil Carbon sTocks And Increase Their Resilience, But To Also Improve The Functional stAte Of Soil Microbial communIties. Key Words: Dom, ChemodiversIty, Microbial diversIty, Ft-icr Ms   基于放射性核素的山东半岛北部滨海湿地沉积环境演变与有机碳储库的讯息解析 学位论文 博士, 北京: 中国科学院大学, 2016 作者:  王启栋 收藏  |  浏览/下载：74/0  |  提交时间：2016/05/31 放射性核素  有机碳  环境演变  沉积物  滨海湿地   川中丘陵区排水沟渠反硝化脱氮效率特征 学位论文 硕士, 北京: 中国科学院研究生院, 2015 作者:  赵原 收藏  |  浏览/下载：37/0  |  提交时间：2016/03/07 川中丘陵区  沟渠  反硝化脱氮  野外调查  定点监测   基于15N示踪技术的黄河三角洲滨海湿地优势植物群落氮素生物地球化学过程 学位论文 博士, 北京: 中国科学院研究生院, 2014 宁凯 收藏  |  浏览/下载：71/0  |  提交时间：2014/07/02 氮  生物地球化学过程  15N  滨海湿地  芦苇  盐地碱蓬  黄河三角洲   次生植被土壤碳、氮养分季节动态及凋落物输入与温度的影响 学位论文 博士, 2009 庞学勇 收藏  |  浏览/下载：93/0  |  提交时间：2010/11/24 岷江上游  次生植被  人工林  阔叶林  凋落物  土壤微生物生物量  可溶性有机碳  可溶性有机氮  碳矿化  凋落物输入  根系排除  the upper reaches of Minjiang River  secondary vegetation  plantation  broad-leaf forest  litter  soil microbial biomass  dissolved organic C  dissolved organic N  carbon mineralization  litter input  root exclusion