Results 41 to 50 of about 9,678 (164)

Amphibians and Reptiles of Ethiopia—Biogeography, Conservation Priority Areas, and Potentials for “One Plan Approach” Conservation Measures 埃塞俄比亚的两栖爬行动物——生物地理学、保育优先区及“一体化方案”保育措施的潜力

open access: yesIntegrative Conservation, Volume 4, Issue 3, Page 442-463, September 2025.
In this study, we analyze the conservation status of Ethiopia's amphibian and reptile diversity in terms of coverage with protected areas and global representation in conservation breeding facilities. We identify conservation gaps and suggest priorities for improvement.
Kolja Sperling   +3 more
wiley   +1 more source

断根和施肥对杨树人工林根际土壤肥力及生物学特性的影响

open access: yesShuitu Baochi Xuebao, 2008
采用田间小区试验研究了不同的断根和施肥措施对I-107杨树人工林根际养分、微生物数量及酶活性的影响。结果表明:相同处理的杨树林地根际土壤pH均低于非根际土壤,而有机质、速效氮、速效磷、速效钾、有效铜和有效锌的含量均高于非根际土壤;与其它处理相比,断根施肥处理的根际土和非根际土壤速效养分含量最高,差异达显著水平;与对照相比,断根施肥处理显著提高了林地土壤的脲酶、转化酶、过氧化氢酶、多酚氧化酶和过氧化物酶活性,而施肥未断根处理少量增加了此5种土壤酶活性,断根未施肥处理则降低了土壤酶的活性 ...
FENG, LIU, XING, DU, DUAN, LIU, WANG
doaj  

不同生育时期根际土壤渍水逆境对冬小麦N、P、K素营养的影响

open access: yesShuitu Baochi Xuebao, 2006
运用盆栽模拟土壤渍水逆境试验,研究不同生育时期根际土壤渍水逆境对不同小麦品种N、P、K素吸收、运转和分配的影响。结果表明,根际土壤渍水逆境对不同小麦品种N、P、K素吸收的影响有异;不同生育时期根际土壤渍水逆境显著影响根系对N、P素的吸收、运转与分配,以孕穗期渍水逆境影响最大,其次为灌浆期和拔节期,而不同生育时期根际土壤渍水逆境对K素的吸收影响较小。孕穗期以前浈水逆境主要影响小麦根系对N,P,K案的吸收.对N、P、K素在小麦体内的运输和分配影响较小;灌浆期渍水逆境不仅影响根系对N、P、K素的吸收 ...
魏凤珍   +4 more
doaj   +2 more sources

Microbial Community and Plant Growth-Promoting Bacteria in Rhizosphere of Halophyte Sesuvium portulacastrum L. [PDF]

open access: yes, 2017
植物促生菌(Plantgrowth-promotingbacteria,PGPB)是指能够通过直接或间接方式促进植物生长的细菌,在自然环境中PGPB有多种存在形式,既可以独立生存也可以与植物组织形成特定关系,常见的有根际促生菌和根系内共生菌,当前对植物根系促生菌的研究多集中于陆生植物和农作物中,而对植物修复中根系促生菌的研究相对较少。 本研究是在已开展的利用生态浮床技术进行富营养化海水植物修复的基础上,进一步研究修复植物海马齿(SesuviumportulacastrumL ...
李华
core  

RETRACTED: The Growing Tide of Antiscience Sentiment: A Global Concern

open access: yesWorld Medical &Health Policy, Volume 17, Issue 3, Page 529-537, September 2025.
ABSTRACT The growing tide of antiscience sentiment represents a critical global challenge, with particularly visible manifestations in the United States. This viewpoint examines how the rejection of scientific consensus threatens academic institutions, public health, and technological progress worldwide.
Thorsten Rudroff
wiley   +1 more source

Rhizosphere soil nutrient and enzyme activity of Casuarina equisetifolia clone plantation and seedling plantation [PDF]

open access: yes, 2008
木麻黄无性系林根际土壤有机质、全氮、水解氮、全磷、全钾、速效钾、钙和镁离子含量均大于木麻黄实生林,有效磷含量则相反。与实生林相比,木麻黄无性系林根际和非根际土壤pH值均有所下降,CEC值增加。木麻黄无性系林根际土壤脲酶、磷酸酶、过氧化物酶及多酚氧化酶活性均高于木麻黄实生林。脲酶除外,其余3种酶活性均是根际大于非根际。与木麻黄实生林相比,木麻黄无性系林根际环境得到改善,林地土壤营养贮量和养分供应能力提高,生长效果亦优于本地实生苗造林。The results showed that the contents
侯杰, 卢昌义, 叶功富, 张立华
core  

Uncovering the Nanozostera japonica species complex suggests cryptic speciation and underestimated seagrass diversity

open access: yesNew Phytologist, Volume 247, Issue 5, Page 2086-2097, September 2025.
Summary The importance of marine angiosperms, or seagrasses, as foundation species for marine coastal ecosystems is in marked contrast to their low species number of only 70 described taxa. Seagrass species tend to have very similar overall morphologies dictated by hydrodynamic forces of the ocean environment.
Xiaomei Zhang   +14 more
wiley   +1 more source

岷江上游山地森林/干旱河谷交错带不同植被恢复模式对根际土壤微生物量碳氮及固氮菌群落结构的影响

open access: yesShuitu Baochi Xuebao, 2011
以岷江上游山地森林/干旱河谷交错带5种植被恢复模式的根际与非根际土壤为研究对象,对土壤微生物生物量碳、氮和土壤固氮菌群落结构的影响进行了初步研究.结果表明,5种不同植被根际与非根际土壤的微生物生物量存在显著差异且根际土壤含量大于非根际土壤,依次为:青冈次生林>灌木林>刺槐林>人工幼林>针阔混交林;DGGE图谱显示,5种植被根际与非根际土壤固氮类群有一条明显的共有条带,其中刺槐林和灌木林的固氮菌多样性最高;多样性指数、群落丰富度分析表明,灌木根际土壤固氮菌的群落种群结构最丰富,其次为刺槐;聚类分析结果显示,
钟熙敏   +6 more
doaj  

土壤呼吸作用时空动态变化及其影响机制研究与展望. [PDF]

open access: yes, 2009
测定不同陆地生态系统土壤呼吸速率及其时空波动,阐明其影响因子,对于全球碳素平衡预算和全球变化潜在效应估计是最为基本的数据。然而,有关土壤呼吸作用变异性及其影响因素的知识仍存在局限性,一些关键的过程和机制还有待阐明。该文综述了近年来土壤呼吸作用时空动态规律、影响机制和模拟方面的研究进展,指出环境因子和生物因子共同驱动着土壤呼吸作用的时间动态变化;土壤呼吸作用在不同时间尺度上还具有明显的空间异质性,这主要是植被覆盖、根系分布、主要的环境因素和土壤特性空间分布的异质性造成的 ...
周广胜., 韩广轩
core  

“Semper supra”? Trump administration policy narratives and the creation of the space force

open access: yesReview of Policy Research, Volume 42, Issue 5, Page 1157-1183, September 2025.
Abstract In 2019, the Donald Trump administration rejected the draft Treaty on the Prevention of Placement of Weapons in Space (PPWT) in the UN Conference on Disarmament and instead created the Space Force, the first new US military service branch established in decades.
Jeffrey S. Lantis
wiley   +1 more source

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