Results 51 to 60 of about 16,819 (163)

不同覆盖对夏玉米叶片光合和水分利用效率日变化的影响

open access: yesShuitu Baochi Xuebao, 2004
在中国气象局农业气象试验基地,对留残茬和秸秆覆盖措施下夏玉米叶片光合作用和叶片水平上的水分利用效率进行了试验研究,以探索夏玉米在这两种方式下的节水抗旱高产的生理生态机制。试验结果表明:光合速率日变化差异主要表现在上午;下午虽不甚明显,但也是覆盖和残茬两个处理略高于对照,说明2种土表覆盖方式促进了该时段光合速率的提高。留残茬和覆盖能明显提高夏玉米叶片水平上的水分利用效率,尤其在下午表现更为明显,最终提高产量水平上的水分利用效率,使农田的光、温和水资源得以科学有效地利用。
刘庚山 郭安红 任三学 安顺清 阳园燕 毛飞 赵花荣
doaj   +2 more sources

畦灌液施方式对夏玉米灌溉质量和水分利用率的影响

open access: yesShuitu Baochi Xuebao, 2018
通过田间夏玉米畦灌试验,分析畦灌液施方式对作物生长和土壤水氮的影响,评价不同处理下的灌溉施肥质量和水分利用效率,探究适宜的畦灌液施方式。在畦田试验中选择不同畦宽、施肥时机和改水成数,采用正交设计选取最优的液施组合。结果表明,不同畦灌处理对土壤水氮存储效率影响不显著,但对水氮均匀度产生显著影响,土壤水分存储效率(59%~63%)略低于氮素存储效率(61%~64%),而均匀度(95%~99%)略高于氮素均匀度(85%~94%)。畦宽、施肥时机和改水成数显著影响夏玉米产量和水分利用效率。综合各项指标考虑 ...
高剑民   +5 more
doaj  

Present status and application perspectives of stable isotopes in coastal wetland ecosystem research: A review [PDF]

open access: yes, 2013
滨海湿地生态系统位于海陆交错地区,具有独特的生态系统特征、很高的服务功能和巨大的资源潜力,但同时也受到人为活动的严峻威胁。作为天然示踪物的稳定同位素为研究滨海湿地生态环境问题提供了重要手段。本文着重探讨了稳定同位素在滨海湿地动物食物源和食物网结构、滨海植物水分来源和利用效率、环境污染和生物入侵等全球变化对滨海湿地结构和功能的影响等方面的应用,指出了当前应用中存在的不足,如食物网研究中样品处理方式和富集度的确定,水分来源研究中水分抽提方法和仪器选择等 ...
冯建祥   +4 more
core  

Surface‐Embedded Ag@Multilayer Graphene for Photothermal‐Enhanced Superhydrophobic Anti‐Icing Coatings

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Harnessing solar energy for self‐heating presents an effective strategy to suppress surface ice formation. In this paper, we fabricated nano‐silver‐modified multilayer graphene sheets (Ag@MGs) that integrate photothermal and superhydrophobic properties for anti‐icing applications.
Yihan Zhang   +7 more
wiley   +1 more source

保水剂施用对丹参物质形成与养分利用的影响

open access: yesShuitu Baochi Xuebao, 2011
阐明保水剂在道地丹参种植中的应用效果有助于保水剂在丹参节水抗旱种植中的合理应用。利用盆栽试验,比较不同保水剂用量下丹参物质形成、氮磷钾养分的吸收与利用效率的差异。结果表明,施用保水剂能促进干物质的积累与分配,增加根/冠比和丹参产量;保水剂施用降低了土壤容重,适度的土壤容重减小有助于丹参高产;不同保水剂用量下氮磷钾养分在丹参根系与地上部中的吸收分配与积累、农艺利用效率存在明显差异,过高的剂量不利于丹参的生长与养分的吸收利用,适宜剂量能显著提高丹参产量和氮磷钾肥农艺利用效率。1.2~1.8g ...
寇太记   +5 more
doaj  

碳稳定同位素技术在植物水分胁迫研究中的应用 [PDF]

open access: yes, 2004
植物体的碳稳定同位素组成主要由植物本身的生物学特性决定, 但环境胁迫对其影响也十分明显。综述了碳稳定同位素 技术在研究植物水分利用效率、生物量高低及判断历史气候依据等研究领域的进展, 阐明了植物体的D13C 值对干旱、盐分及其 它环境因素的变化所引起的水分胁迫的响应 ...
严重玲   +4 more
core  

Integrating Urban Expansion and Flood Risk: A Spatial Assessment of Impervious Surface Growth and Floodplain Exposure in Mecklenburg County (2011–2021)

open access: yesWorld Water Policy, Volume 12, Issue 1, February 2026.
ABSTRACT Urban expansion significantly impacts flood risk, particularly in rapidly growing areas where impervious surfaces exacerbate surface runoff. This study examines spatial patterns of urban growth and their effects on flood exposure in Mecklenburg County, North Carolina, from 2011 to 2021.
Pegah Madadi, Azad Sadeghi
wiley   +1 more source

The Role of Public Finance to Address the Global Finance Gap for Drinking Water Services

open access: yesWorld Water Policy, Volume 12, Issue 1, February 2026.
ABSTRACT Meeting SDG target 6.1 for drinking water requires addressing the finance gap between the funds available from tariffs, taxes and transfers, and the life‐cycle costs of sustaining these services. While there are li‐mitations to applying repayable finance to address this gap, governments can be well suited to support both drinking water ...
Kristina Nilsson
wiley   +1 more source

调亏灌溉对新疆滴灌春小麦土壤水分、硝态氮分布及产量的影响

open access: yesShuitu Baochi Xuebao, 2018
2017年和2018年在北疆滴灌春小麦栽培中,额定施氮量为纯氮300 kg/hm2,设置3个调亏灌水量(水分不调亏E1:100% ET0;水分中度调亏E2:80% ET0;水分重度调亏E3:60% ET0)和2个小麦品种(水分敏感型X1:新春22;水分不敏感型X2:新春44),灌溉频率为7天1次。研究不同处理对滴灌春小麦土壤水分、硝态氮分布及产量的影响。结果表明:(1)水分重度调亏(E3)可以缓解0—40 cm土壤水分和土壤硝态氮向深层流失,减少作物耗水量,提高水分利用效率。(2 ...
万文亮   +5 more
doaj  

Effects of organized guarding on mortality from human–elephant conflict in northeast India

open access: yesConservation Biology, Volume 40, Issue 1, February 2026.
Abstract Human–elephant conflict (HEC) frequently results in human and elephant mortality, posing major social justice and conservation concerns across Asia and Africa. Although a variety of interventions have been introduced to mitigate HEC, rigorous evaluations of how they affect mortality are practically nonexistent.
Nitin Sekar   +6 more
wiley   +1 more source

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