Results 31 to 40 of about 42,285 (162)
New Phytologist, Volume 247, Issue 6, Page 2616-2629, September 2025.Summary Seagrasses are important contributors to environmental nutrient cycling in marine ecosystems and can improve water quality by absorbing excess nitrogen (N). However, these ecosystems are vulnerable to human‐mediated pressures, including marine heatwaves (MHWs), particularly those of longer duration. We performed an experiment simulating a 30‐d,
Alissa V. Bass +5 more
wiley +1 more source
Shuitu Baochi Xuebao, 2005 对科尔沁沙地不同沙漠化阶段土壤有机碳、全氮含量、土壤质地以及碳氮密度进行了测定与分析。结果表明,沙漠化过程中不同阶段的特征体现在土壤碳、氮、颗粒组成的有规律变化,土壤碳、氮含量衰减,质地变粗;从潜在沙漠化阶段到严重沙漠化阶段,100 cm深土壤有机碳和全氮含量分别下降91.6%和85.8%,有机碳密度从4 877.9(C)g/m2下降到481.8(C)g/m2,全氮密度从518.0(N)g/m2下降到89.4(N)g/m2;土壤有机碳、全氮与土壤细颗粒组分(
李玉强 赵哈林 赵学勇 张铜会 移小勇 左小安
doaj +2 more sources
Multiple global change factors alter the scaling of nitrogen to phosphorus in alpine plants
Functional Ecology, Volume 39, Issue 8, Page 2044-2055, August 2025.Read the free Plain Language Summary for this article on the Journal blog. Abstract The stoichiometry and allometry of nitrogen (N) and phosphorus (P) reflect nutrient absorption and dynamic allocation by plants, and can be regulated by global change factors (e.g. nitrogen enrichment, climate warming and altered precipitation). Yet, how multiple global
Jiapu Li +10 more
wiley +1 more source
Environmental racism and air pollution: Pre and post the COVID‐19 economic shutdown
Review of Policy Research, Volume 42, Issue 4, Page 949-981, July 2025.Abstract Decades of research demonstrates that minoritized groups are disproportionately affected by swathes of harmful pollutants, including air pollution, even controlling for low income. Would significantly reducing individual car traffic help reduce the EJ gap?
Heather E. Campbell +3 more
wiley +1 more source
, 2006 2002~2003年对塔里木盆地南缘的策勒县和北缘的尉犁县农户的棉田施氮现状进行了实地调查。结果表明:区内农户间施氮量差异较大,平均施氮总量达426~430 kg/hm2,过量施氮很普遍,分别有39.5%(策勒)和72.8%(尉犁)的农户过量施氮,施氮量与产量已经不相关,增加施氮已经不能增产,生产中应该遏止施氮量增加趋势,适当减少高施氮量。另外,还有6.2%~7.9%的棉田施氮量不足,这部分农户应该提高施氮量;策勒县偏重追施氮肥,单次追肥施氮量偏大,基追比为1∶5.12。尉犁县偏重基施氮肥 ...
王平, 张福锁, 陈新平, 田长彦
core
Shuitu Baochi Xuebao, 2017 选取昆明市松华坝水源区典型小流域——迤者小流域为试验区，通过布设标准径流小区，在2009—2015年对坡耕地产流产沙及氮、磷流失情况进行长期的野外观测研究，从年际尺度上来探讨等高反坡阶对于坡耕地产流产沙及氮、磷等养分流失的影响。结果表明：等高反坡阶对于径流和泥沙的削减效果均较为明显，年平均减流率为50.64%，年平均减沙率74.99%，减沙率显著大于减流率；等高反坡阶对于径流和泥沙中氮、磷均有较为明显的削减效果，平均每年可以削减68.75%的氮流失和82.16%的磷流失 ...
王帅兵, 王克勤
doaj
Shuitu Baochi Xuebao, 2020 草本缓冲带能够有效拦截坡面径流中泥沙、总氮、总磷等污染物，是农业面源污染防控的主要措施之一。通过人工配水模拟地表径流，研究不同径流量对草本缓冲带截污能力的影响。结果表明：草本缓冲带对污染物都有一定的削减作用，草本缓冲带对泥沙削减效果最好，对总磷削减效果最差，白三叶对污染物的削减能力总体较黑麦草强。径流量对草本缓冲带总氮、总磷削减率影响较大，对泥沙削减率影响较小；当流量从0.08 L/s增加至0.24 L/s 时，草本缓冲带对总氮、总磷削减率减少至9%和6%，而泥沙削减率为34%。随着放水冲刷时间增加 ...
付婧 +5 more
doaj
Shuitu Baochi Xuebao, 2022 为指导水稻田合理施肥,防治稻田面源污染,试验开展了不同氮肥减施比例对紫云英—水稻轮作体系下稻田田面水氮磷流失的影响研究。2020年在浙江建德开展田间小区试验,设置冬闲(CK)和冬种紫云英(CT)2个处理,并在冬种紫云英基础上设置4个减氮比例,分别为0(CT0),10%(CT1),20%(CT2),30%(CT3),共5个处理,每个处理重复3次。在水稻移栽施肥后开始稻田田面水样品采集(包括施肥2周内的连续采样以及2周后相隔7,14,28天的间隔采样),测定田面水氮磷浓度;于水稻成熟后采集土壤和植物样品 ...
吕永强 +5 more
doaj
Functional Ecology, Volume 39, Issue 5, Page 1274-1287, May 2025.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
wiley +1 more source
, 2011 干旱区高产棉花的水肥管理中存在一定的盲目性,过量灌水和施氮造成资源浪费,另一方面会对环境造成影响。氮素在环境中的活跃特性使氮素管理一直是养分资源管理的核心和难点。 本课题组通过多年研究建立的高产棉田水氮优化管理技术,采用氮素实时监控技术和土壤水分实时监测技术进行分阶段氮肥和水分推荐,采用过程控制结果的技术手段,同步作物水氮需求和土壤水氮供应,在多年多点的验证试验中,与常规氮素管理比能够在保证棉花高产和品质的前提下,大幅度的降低施氮量(40.7%-55.8%)和灌水量(33.3%－35.3 ...
core