Results 31 to 40 of about 1,371,758 (148)
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, 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
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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
, 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
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Island restoration to rebuild seabird populations and amplify coral reef functioning
Conservation 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
, 1991 一种用于工业废气，特别是硝酸厂尾气中氮氧化物净化的催化剂以分子筛和Ａｌ2Ｏ3混合物作为载体、铁、铜、钒和／或微量铂元素为活性组分，使用这种催化剂在３０，０００－８０，０００时-1空速下，２２０－２５０℃范围内ＮＨ3／ＮＯx为０．９－１．２时可高效净化ＮＯx（含２０００－１０００ｐｐｍＮＯx气体可净化到２００ｐｐｍ以下），该催化剂含有金属铂后可使反应温度降至２００℃左右，且ＮＯx转化率可以９８％，此外催化剂无毒，氨耗低、寿命长 ...
李北芦, 吴春田, 李时瑶
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Dutch landscapes have lost insect‐pollinated plants over the past 87 years
Journal of Applied Ecology, Volume 61, Issue 6, Page 1323-1333, June 2024.This study implies that Dutch landscapes are losing insect‐pollinated plant species, which is likely due, at least in part, to the decline in pollination services. Our results of quantifying the decline in insect‐pollinated plants support the necessity and urgency of taking conservation initiatives.
Kaixuan Pan +3 more
wiley +1 more source
, 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
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, 2019 氮气是储量丰富且廉价易得的氮源,但无法被人类或动植物直接吸收利用,只有通过化学或生物方法将空气中游离的氮气转化为含氮化合物才能被人类应用于食品或其他工业生产中,因此氮气的固定及转化已经逐渐成为新的研究热点。而氨是一种非常重要的无机化工产品,其在农业、医药、储能等行业中有着重要的作用,且需求量随着社会日益发展和人口的不断增加而不断增加。首先简单介绍了现有的氮气固定合成氨方法及其作用机理,随后重点综述了氮气电化学合成氨催化剂的研究现状 ...
袁浩然, 邓丽芳, 钱鑫, 王鲁丰
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, 2016 研究了N_2气氛下硼砂与尿素反应生成六方氮化硼以及主要副产物产生和变化的过程,采用热重-差示扫描量热法(TG-DSC)、X射线衍射(XRD)、扫描电子显微镜(SEM)等检测手段对反应产物和氮化硼样品进行了分析.研究结果表明,氮化硼在700℃左右完全生成,随焙烧温度的提高其结晶度不断提高.反应副产物偏硼酸钠的生成是导致氮化硼产率较低的主要原因,在高温焙烧过程中偏硼酸钠的存在有利于六方氮化硼的结晶过程.研究结果可为硼砂-尿素法六方氮化硼制备工艺的优化和改进提供理论基础.
朱高远 +6 more
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