Results 41 to 50 of about 1,380,454 (148)

缓释尿素对两种土壤小麦氮素运转、产量和土壤无机氮的影响

open access: yesShuitu Baochi Xuebao, 2018
为探明缓释尿素与普通尿素掺混比例对安徽小麦花后氮素运转特征和土壤氮素盈余的影响,分别选择安徽省北方小麦产区小麦—玉米轮作和南方小麦产区小麦—水稻轮作方式,土壤类型分别为两合土和黄棕壤,设置不施氮肥处理(CK)、农民习惯处理(Ncon)、减少普通尿素用量的优化氮素处理(Nopt)、缓释尿素及其掺混普通尿素处理(SRU1、SRU2、SRU3)和普通尿素全部基施处理(SRU4),分析了不同施肥处理在两种土壤上小麦花后氮素转运、产量、氮肥利用率和土壤无机氮积累量。结果表明:与黄棕壤比较 ...
袁嫚嫚   +5 more
doaj  

Nitrogen‐transforming microorganisms potentially facilitate the invasion of Moso bamboo (Phyllostachys edulis) into evergreen broadleaf forests

open access: yesFunctional 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

湿地氮素传输过程研究进展

open access: yes, 2005
综述了湿地氮素传输过程的研究进展。湿地氮素传输过程包括物理过程、化学过程和生物过程,与土壤、植物的发生、发育紧密联系在一起,并形成了空气-水-土-生命系统中物质循环和能量流动的复杂网络。湿地硝态氮的淋失直接威胁着湿地地下水水质安全,N2O源汇转变受土壤和水体等环境因子的制约,氨挥发则与水体pH值密切相关排放。湿地氮素的化学转化过程是矿质养分供给和N2O产生的主要机制,受环境因子和人类活动干扰的影响;动力学模型可用于描述氮素的化学转化过程。湿地植物的吸收和累积以及微生物的分解过程是湿地氮素循环的重要环节 ...
白军红, 王庆改, 欧阳华, 邓伟
core   +1 more source

氮肥配施增效剂实现寒地水稻增产、提质与增效

open access: yesShuitu Baochi Xuebao, 2019
研究氮肥增效剂对寒地水稻产量、品质及氮素利用的影响,旨在为制定合理的稻田氮素管理措施及增产、提质和增效策略提供科学依据。2017年和2018年在黑龙江省方正县设置田间试验,研究氮肥配施硝化抑制剂和脲酶抑制剂对水稻产量、品质、氮素利用和转化及经济收益的影响。结果表明:尿素配施硝化抑制剂CP和脲酶抑制剂NBPT (N+NI+UI)显著提高水稻产量,2017年较氮肥处理(N)水稻籽粒、秸秆和总生物量分别增产6.4%,4.9%和5.8%,2018年分别增产8.8%,7.2%和8.2 ...
郝小雨   +6 more
doaj  

Altered nutrient cycling functionality in seagrass meadows under a simulated future marine heatwave event

open access: yesNew 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

水体中三氮转化规律及影响因素研究

open access: yes, 2007
以城市污染水体为对象,研究了水体中氨氮(NH3-N)、亚硝酸盐氮(NO3^--N)、硝酸盐氮(NO3^-N)的转化及去除规律。结果表明,温度对水体中三氮(氨氮、亚硝酸盐氮、硝酸盐氮)的去除具有重要的影响,在夏季实验中三氮的转化及去除速率明显高于冬季;而在温度相似的情况下,光照则成为影响三氮转化去除速率的决定因素,还发现,在黑暗条件下,水体中亚硝酸盐氮、硝酸盐氮出现明显的累积现象,而在光照情况下则没有。由此推断,在光照条件下藻类生物的同化作用在三氮转化和去除中起了主要作用 ...
俞盈, 盛彦清, 付广义, 陈繁忠
core  

Plant–microbe interactions drive the rhizosphere microbial assembly and nitrogen cycling in a subtropical forest

open access: yesFunctional 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

稻田生态系统氮素转化经济价值研究

open access: yes, 2005
根据2002年上海奉贤县五四农场田间实验数据,结合相关研究结果对稻田氮素输入和输出进行研究,并运用生态经济学和环境经济学方法计算稻田生态系统氮素转化的经济价值.结果表明,当季不施氮肥的处理小区氮素收支出现赤字;而施加氮肥的处理小区氮素收支都出现盈余.不施氮处理小区单位面积稻田提供的氮素转化综合价值为正;而施加氮肥的小区其氮素转化的综合价值都为负.施氮处理小区氮素转化的负价值主要是由于过量氮肥导致田间氮素以氨挥发 ...
鲁春霞, 肖玉, 谢高地
core  

Island restoration to rebuild seabird populations and amplify coral reef functioning

open access: yesConservation Biology, Volume 39, Issue 1, February 2025.
Abstract Mobile organisms like seabirds can provide important nutrient flows between ecosystems, but this connectivity has been interrupted by the degradation of island ecosystems. Island restoration (via invasive species eradications and the restoration of native vegetation) can reestablish seabird populations and their nutrient transfers between ...
Ruth E. Dunn   +5 more
wiley   +1 more source

Response of Various Cultivars of Winter Wheat in Assimilative Matter and N Translocation before Anthesis to N Fertilizer

open access: yes, 2006
为探究不同品种冬小麦花前同化物和氮素转移对氮肥的反应,以NR9405、9430、偃师9号、小偃6号、陕229号和西农2208等冬小麦品种为供试材料,通过盆栽试验,测定和分析了土壤不同供氮状况下冬小麦花前同化产物和氮素转移的变化。结果表明,施用氮肥可显著增加冬小麦花前干物质转移量和转移效率以及花前和花后吸氮量、花前氮转移量,提高花前干物质对籽粒的贡献率、总吸氮量和籽粒产量,但降低了花前氮的转移效率、对籽粒的贡献率和氮素利用效率。品种间花前干物质转移量、转移效率、对籽粒的贡献率、籽粒产量以及花前吸氮量 ...
李世清   +4 more
core  

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