Results 41 to 50 of about 52,542 (179)
Shuitu Baochi Xuebao, 2017 通过田间减施氮肥试验，设置减氮20%+不施有机肥(N1O0)，减氮20%+普通有机肥(N1O1)，减氮20%+生物有机肥（N1O2），减氮40%+不施有机肥（N2O0），减氮40%+普通有机肥（N2O1），减氮40%+生物有机肥（N2O2）处理，以不施肥（CK0）和全氮100%（N100）为对照，研究配施有机肥减氮对川中丘区玉米土壤微生物量碳、土壤酶活性及玉米产量的影响，为玉米生产减氮增效提高玉米氮素利用率提供理论依据。结果表明：随施氮量减少土壤脲酶、蔗糖酶、过氧化氢酶活性及微生物量碳含量逐渐降低 ...
王兴龙 +7 more
doaj
Shuitu Baochi Xuebao, 2020 为明确减氮测控定量施肥技术结合地膜覆盖措施对黄土旱塬冬小麦产量构成及水肥利用效率的影响，为旱地冬小麦减施氮肥及提高产量提供理论依据，于2013—2018年在晋南黄土旱塬冬小麦种植区，设置农户施肥种植模式、减氮测控施肥、减氮测控施肥+垄膜沟播和减氮测控施肥+平膜穴播4种处理，分析了在减氮覆膜条件下连续5年冬小麦产量构成情况、土壤水分和氮、磷、钾肥利用效率。结果表明：（1）减氮测控施肥较农户模式在减少氮肥施用量46.9%，平衡施用磷钾肥的情况下，冬小麦年均籽粒产量、生物产量和公顷穗数分别增加4.4%，4.0%
刘凯 +9 more
doaj
临床医学与护理目的：探析CRRT治疗重症急性肾衰竭患者中细节护理的应用效果。方法：从2024年1月至2025年12月行CRRT治疗的重症急性肾衰竭患者中取80例为研究对象，在随机数字表法操作下分组，向对照组（40例）提供常规护理，为观察组（40例）提供细节护理，比较两组肾功能指标、并发症发生率与护理满意度。结果：护理前观察组与对照组血尿素氮（BUN）、血肌酐（SCR）均高于护理后，护理后观察组血尿素氮（BUN）、血肌酐（SCR）明显低于对照组（P＜0.05），观察组低血压、电解质紊乱、出血 ...
明月 方, 璐通 王
semanticscholar +1 more source
New Phytologist, Volume 249, Issue 2, Page 764-776, January 2026.Summary Fine roots are critical for soil resource uptake, yet how declining plant diversity alters fine root biomass (RB) and traits remains unclear. We tested how plant functional trait dissimilarity in shade tolerance, drought tolerance, growth rate, and nitrogen‐fixation ability drives variation in root attributes.
Sai Peng, Yakun Zhang, Han Y. H. Chen
wiley +1 more source
Shuitu Baochi Xuebao, 2018 施用新型肥料是减少养分径流损失的重要途径。采用田间试验研究了施用包膜尿素对水稻生长和径流氮磷损失的影响，试验设置CK （习惯施肥）、PU1（减磷41%、减氮20%、施普通尿素）、PU2（PU1基础上减氮13%）、UR1（PU2基础上施包膜尿素）和UR2（UR1基础上减氮13%）5个处理。结果表明：PU1和UR1处理水稻氮磷含量与CK处理相近，PU1成熟期氮、磷总积累量比CK增加11.21，2.69 kg/hm2。PU1和UR1处理成熟期地上部生物量和籽粒产量高于CK处理，籽粒产量分别提高7.68%，5 ...
斯圆丽 +4 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
Review of Policy Research, Volume 42, Issue 6, Page 1496-1508, November 2025.ABSTRACT This study adopts a policy‐centric perspective to explore the complex relationship between sustainable nitrogen management (SNM) and the health risks associated with unsafe drinking water. The critical policy challenge lies in balancing the essential role of nitrogen fertilizers in achieving high agricultural productivity with their ...
Mingean Park +3 more
wiley +1 more source
Functional Ecology, Volume 39, Issue 10, Page 2704-2716, October 2025.Read the free Plain Language Summary for this article on the Journal blog. Abstract Moso bamboo (Phyllostachys edulis) invasions into broadleaf forests can cause serious ecological problems, such as reducing biodiversity and disrupting community succession.
Ting Zhou +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
Trait‐Mediated Competition for Light Underpins Plant Diversity Loss Under Eutrophication
Global Change Biology, Volume 31, Issue 9, September 2025.Eutrophication often reduces plant diversity by making the ground layer darker, which reduces understory plants. In a natural alpine grassland, we added LED light beneath the canopy and saw diversity return across different nutrient treatments: with added nitrogen fertilizer, light mainly increased new species; with added phosphorus fertilizer, it ...
Tianyuan Tan +7 more
wiley +1 more source