Results 1 to 10 of about 2,112 (101)

Prolonged Nutrient Enrichment Slows the Recovery of Biodiversity and Productivity After Its Cessation. [PDF]

open access: yesGlob Chang Biol
Grassland recovery following nutrient cessation is asymmetric and strongly shaped by nutrient enrichment history. Higher nutrient addition rates and longer enrichment duration caused larger departures from control conditions, with biomass recovering more rapidly than species richness over decadal timescales.
He M   +8 more
europepmc   +2 more sources

Impacts of livestock grazing on blue‐eared pheasants (Crossoptilon auritum) survival in subalpine forests of Southwest China 散放家畜对中国西南山地亚高山森林雉类蓝马鸡的影响

open access: yesIntegrative Conservation, Volume 2, Issue 4, Page 201-213, December 2023., 2023
Livestock disturbances decreased the area of suitable habitat of forest pheasants by 14.28% in 7 years. Livestock activities remarkably increased the nest failure rate (by 2.18 times) of forest pheasants. Abstract The degradation and fragmentation of natural habitats, driven largely by anthropogenic activities such as grazing, represent growing ...
Xing Chen   +7 more
wiley   +1 more source

人工湿地在修复富营养化水体中的应用及研究进展

open access: yesGongye shui chuli, 2021
近年来,水体富营养化呈现加剧态势,不仅引起藻类爆发,还严重影响水质安全。其中,氮、磷和有机物是造成水体富营养化的主要污染物。人工湿地作为一种低成本、高效率的生态治理技术,适用于修复富营养化水体。影响人工湿地去污的主要因素包括:湿地类型及构建方式、水力运行条件和碳氧水平。探讨了人工湿地净化富营养化水体的主要机制,总结了影响人工湿地去污的主要因素,并提出相应的改进方法。最后,对今后的相关研究方向进行了展望。
孙园, 魏心雨, 丁怡
doaj   +2 more sources

Prioritizing conservation in sub‐Saharan African lakes based on freshwater biodiversity and algal bloom metrics

open access: yesConservation Biology, Volume 36, Issue 5, October 2022., 2022
Abstract As agricultural land use and climate change continue to pose increasing threats to biodiversity in sub‐Saharan Africa, efforts are being made to identify areas where trade‐offs between future agricultural development and terrestrial biodiversity conservation are expected to be greatest. However, little research so far has focused on freshwater 
Cody Danaher   +3 more
wiley   +1 more source

Relationship between elements in the absorption and purification(富营养化水体中植物的元素吸收与净化能力的关系)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2002
研究了不同植物在两种程度富营养化水中对元素的去除率及对富营养化成分的去除率.在重度富营养化水中,蒸腾强度高的植物对水中各成分均具较好的净化效果;而在轻度富营养化水中,所研究的植物间没有共同趋势.另外,可根据不同植物对环境的各自适应方式将其用于净化不同类型的污水.其中,灯芯草和空心菜不需元素补给,在重度和轻度富营养化水中均具较好的净化能力;鸭跖草是耐阴植物,有适度遮荫时净化效果较好;菩提子用于净化重度富营养化水时需补给适量的常量营养元素;芦苇在轻度富营养化水中净化能力较好 ...
GUANBao-hua(关保华)   +6 more
doaj   +1 more source

Remediation of eutrophlc water by terrestrial plant in enclosure: the purification effect and dynamics processes of Lolium multiflorum for removing TP(陆生植物黑麦草(Lolium multiflorum)对富营养化水体修复的围隔实验研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2007
采用围隔系统研究了陆生植物黑麦草(Lolium multiflorum)对畜禽养殖富营养水体中主要营养元素磷的净化效应及动态过程.结果表明:浮床黑麦草在富营养化水体中生长良好,对富营养水体中的总磷具有明显的净化效果.当覆盖率为30%时,对总磷的去除率最高达到72.96%.对其去除水体总磷的动态过程拟合表明符合三次方程曲线,实验结果为陆生植物修复富营养水体的季节模式和机理的深入研究提供了科学依据.
GUOPei-yong(郭沛涌)   +6 more
doaj   +1 more source

DHA营养强化鸡蛋研究进展Research progress on DHA fortified eggs

open access: yesZhongguo youzhi, 2023
DHA能有效促进大脑发育、改善视力、预防心血管系统疾病等,但其在人体内的生成量不能满足需求,需要靠食物获得。开发DHA营养强化鸡蛋,可以为人们获取足量、廉价、优质的DHA提供有效途径。为了加强对DHA营养强化鸡蛋的研发,推动其进一步发展,从DHA的生理功能视角出发,分析了DHA营养强化鸡蛋开发优势、饲料脂肪酸对鸡蛋中DHA的调控机制,阐述了DHA营养强化鸡蛋的脂质组成、饲料中DHA的来源及鸡蛋中DHA的稳定性。富含DHA的日粮可生产富集DHA的鸡蛋,且蛋黄中的DHA具有较高的稳定性 ...
张秋芳1,2,王姿颐2,沈晓芳2 ZHANG Qiufang1,2, WANG Ziyi2, SHEN Xiaofang2
doaj   +1 more source

Remediation of eutrophic water by terrestrial plant in enclosure: the purification effect and dynamics processes of Lolium multiflorum for removing NH3-N(陆生植物黑麦草(Lolium multiflorum )对富营养化水体修复的围隔实验研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2007
采用浮床黑麦草(Lolium multiflorum)对畜禽养殖富营养水体氨氮的净化效应及动态过程进行了研究.结果表明:浮床黑麦草对富营养水体中的氨氮具有明显的净化效果.当覆盖率30%时,对氨氮的去除率最高可达到95.89%.对其去除水体氨氮的动态过程拟合表明符合三次方程曲线.该研究为冬季陆生植物修复富营养水体提供重要依据.
GUOPei-yong(郭沛涌)   +6 more
doaj   +1 more source

基于生物利用度分析食品中营养强化的 价值——以DHA为例Analysis of the value of nutritional fortification in food based on bioavailability: taking DHA as an example

open access: yesZhongguo youzhi, 2023
随着生活水平的提高,人们对于食品中的营养要求越来越高。DHA在人体内具有促进神经系统发育等重要作用,尤其在婴幼儿时期更为重要,而食物是人体内DHA补充的重要来源,尤其是深海鱼类和海藻类食物作用更佳。为给大食物观下的精准营养提供参考依据,基于生物利用度的角度,以DHA为例分析食品中营养强化的价值。从天然食品和人工富集食品两个方面介绍了DHA的食品来源,综述了影响DHA食品生物利用度的因素,总结了提高DHA生物利用度的方式,指出了以DHA为代表的营养强化型食品存在的问题以及未来的发展方向 ...
姚婉婷1,胡金庆2,3,齐自元1,4,5,谢庆超1,4,5,欧杰1,4,潘迎捷1,4,5,赵勇1,4,5,刘海泉1,4,5,6,7 YAO Wanting1,HU Jinqing2,3, QI Ziyuan1,4,5, XIE Qingchao1,4,5, OU Jie1,4, PAN Yingjie1,4,5, ZHAO Yong1,4,5,LIU Haiquan1,4,5,6,7
doaj   +1 more source

浅水塌陷塘新型湿地藻类群落季节特征及其对生境的响应

open access: yesShuitu Baochi Xuebao, 2007
以淮南市潘三塘为例,探讨了浅水塌陷塘新型湿地的藻类群落季节特征及其对生境的响应.结果表明,水塘夏季水体有机污染严重(CODCr为52.63 mg/L),营养盐(TP、TN)为Ⅴ类水质,分别达0.45 mg/L,2.01 mg/L,营养状况为重度富营养化,其藻类以蓝藻为优势种;春秋季水体污染稍弱于夏季,属Ⅳ类水质,为中度富营养化,秋季(藻类优势种为绿藻)富营养化程度略高于春季,总体水平接近重度富营养化.藻类生物量Chla秋季最高(27.54 mg/m3),夏季次之(16.85 mg/m3),春季最低(5 ...
王振红, 桂和荣, 罗专溪
doaj   +2 more sources

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