Results 31 to 40 of about 2,600 (170)
Soil carbon dynamic characteristics of coal gangue-filled reclaimed cropland and forest land under time series [PDF]
, 2023 In order to clarify the intrinsic mechanism between soil quality and soil carbon cycling after reclamation and to reveal the characteristic patterns of carbon dynamics of reclaimed soils under time series, the cultivated soils of 3, 6, 9 and 12 a ...
Junfeng QU +3 more
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Ultrasound in Obstetrics &Gynecology, Volume 64, Issue 5, Page 661-668, November 2024.ABSTRACT Objective To determine the diagnostic accuracy of virtual autopsy using whole‐body postmortem ultra‐high field magnetic resonance imaging (MRI) at 7 Tesla (T), using a short T2‐weighted imaging (T2‐WI) protocol, compared with classical autopsy, for detecting structural abnormalities in small second‐trimester fetuses. Methods Thirty consecutive
A. Staicu +11 more
wiley +1 more source
DHR‐PA—Democracy and human rights in public administration in Africa
Politics &Policy, Volume 52, Issue 2, Page 426-449, April 2024.Abstract While public administration research has traditionally paid profound attention to democratic values in government‐citizen relations, public institutions are still wrestling with entrenching human rights norms today. This article's Democracy and Human Rights in Public Administration (DHR‐PA) perspective offers a view that a human rights ...
Gedion Onyango
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Shuitu Baochi Xuebao, 2007 对轮作及大豆、玉米、小麦长期连作白浆土中氮含量及有机态氮组分变化进行研究。结果表明，在不施肥情况下，小麦连作区土壤由全氮、碱解氮降幅最大，酸解总氮、氨基酸态氮和氨基糖态氮降幅最小。在施有机肥情况下，土壤全氮、碱解氮及酸解总氮则以小麦连作区增幅最小，玉米连作区增幅最大；氨基酸态氮和氨基糖态氮在轮作区增幅最大。其他组分氮在轮作与连作小区间变化无规律。
田秀平, 薛菁芳, 韩晓日
doaj +2 more sources
Shuitu Baochi Xuebao, 2005 于西藏中部生态条件下,就麦类作物轮作、麦油轮作对土壤化学和生物性质的影响以及农田养分平衡等进行了初步研究。结果表明,不同轮作方式对土壤化学和生物学过程具有显著不同的影响。轮作周期内春青稞→春油菜、春小麦→春油菜轮作对以细菌为主导的土壤微生物的生长与繁殖具有显著的促进作用,耕层土壤有机质、全氮、全磷的绝对增长量分别达3.05~3.06g/kg,0.06~0.07g/kg,0.01~0.26g/kg。麦类作物间,春小麦→春青稞轮作对土壤肥力亦具明显的恢复作用;春小麦→春小麦连作、春青稞 ...
钱成 蔡晓布 张永青
doaj
Research Progress of Nitrogen Leaching in Farmland Soil [PDF]
, 2014 对农田土壤氮素淋失的相关研究进行综述和总结是研究农业面源氮素污染的一个至关重要的前提。本文从土壤氮素渗漏淋失形态和迁移机理、氮素渗漏淋失的研究方法和影响土壤氮素渗漏淋失的因素三方面进行了详细的分析介绍,概述了近年来国内外农田氮素渗漏淋失的研究进展和研究成果,并在此基础上展望了未来氮素淋失研究工作的重点。研究结论对农田土壤的水肥管理措施及浅层地下水硝氮污染的减缓有一定的理论和借鉴意义Reviewing and summarizing the related research of farmland ...
朱木兰, 李青松, 王吉苹
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Effects of Cross-slope Tillage and Increasing Organic Fertilizer on Soil Nitrogen and Phosphorus Loss Characteristics and Soil Fertility on Gentle Slope [PDF]
, 2023 [Objective] Nitrogen and phosphorus loss characteristics and soil fertility changes on a gentle slope of cultivated land were analyzed under optimal fertilization and cross-slope tillage in order to provide a basis for reducing nitrogen and phosphorus ...
Chen Jianjun +4 more
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Journal of Consumer Behaviour, Volume 23, Issue 1, Page 90-106, January 2024.Abstract This study aims to explore thematic influences on theme park visitors' satisfaction through user‐generated data. To this end, we first used an unsupervised machine learning method, structural topic modeling, and analyzed 112,000 reviews post by visitors to Shanghai Disney Resort from June 16, 2016 to March 4, 2022.
Shizhen Bai +8 more
wiley +1 more source
Shuitu Baochi Xuebao, 2018 通过田间试验研究了不同作物轮作模式中生物质、粗蛋白生产潜力和氨排放，以探讨粮改饲进程中较优的种植模式。以冬小麦—夏玉米（W-SuM）轮作为基准，探讨了华北地区黑麦草—夏玉米（R-SuM）、黑麦草—春玉米（R-SpM）、黑麦草—双季玉米（R-DM）和双季玉米(DM) 4种轮作体系的干物质、粗蛋白的生产潜力和氨气排放。结果表明：黑麦草—双玉米轮作模式较好，干物质年产量和粗蛋白含量分别达到31 012，2 529 kg/hm2，比常规冬小麦—夏玉米体系分别增加了14.3%，8.2 ...
杨 羚 +5 more
doaj
Environmental and economic assessment of the intensive wheat - maize production system in the North China Plain [PDF]
, 2016 To ensure food security for its vast population input intensification in crop production has been one of Chinas major strategies in the last decades.
Ha, Nan
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