Results 51 to 60 of about 24,392 (236)
Shuitu Baochi Xuebao, 2008 2003—2004年开展对9个有代表性的不同产量的苹果园秋季土壤的养分、微生物类群及土壤酶活性的研究,获得不同产量苹果园的土壤微生物生态状况。结果表明,各苹果园的土壤养分、微生物数量、多样性和酶活性均表现出较大差异。随土壤碱解氮、速效磷、速效钾、总碳含量的增加,产量水平呈增高趋势。高产园土壤微生物数量高,多数土壤酶活性强,微生物多样性好。土壤微生物中细菌数量、微生物多样性、蛋白酶、磷酸酶活性可作为评价果园土壤肥力的生物指标。果树产量与土壤微生物类群和数量具有显著正相关,与速效磷、速效钾 ...
陈伟, 姜中武, 胡艳丽, 束怀瑞
doaj
Evaluating past and future contributions of conservation programs to species recovery
Conservation Biology, EarlyView.Abstract Impact evaluation of conservation actions is a crucial step in global efforts to curb the biodiversity crisis. Through robust impact evaluation, practitioners can assess the effectiveness of conservation strategies and optimize the use of limited resources.
Rebeca E. Young +10 more
wiley +1 more source
基于Ｒao-Stirling 指数的学科交叉文献发现-以纳米科学与纳米技术为例 [PDF]
, 2018 摘要: ［目的/意义］学科交叉文献发现是进行学科交叉研究的重要前提，从海量的文献中快速、精准地发现领域相关交叉文献有助于研究人员快速地把握领域学科交叉动态，识别领域学科交叉研究热点与前沿。提出基于Ｒao-Stirling 指数的领域学科交叉文献发现方法，并以纳米科学与纳米技术领域为例，探讨该方法的可行性。［方法/过程］在Web of Science 数据库下载纳米科学与纳米技术领域文献，构建期刊缩写－ 全称－ 学科类别对照表，利用Python 编程构建文献参考文献学科分布矩阵，利用Ｒ ...
刘小平, 徐涵, 韩正琪
core
Effects of parachute science on local research capacity 降落伞科学对当地研究能力的影响
Conservation Biology, EarlyView.Abstract Strengthening research capacity is essential to address the global biodiversity crisis. Yet, parachute science often undermines this goal, and its prevalence, costs, and benefits are unclear. We analyzed 13,502 publications on primate research that we extracted from Scopus (1960–2022) to evaluate the effects of parachute science on local ...
Li Yang +11 more
wiley +1 more source
Study on phytoplankton community similarity and ecological connectivity in northern Beibu Gulf [PDF]
, 2015 浮游植物是海洋生态系统中主要的初级生产者，是构成海洋生态系统食物网的基础环节，其种类变化和群落结构直接影响海洋生态系统的结构和功能，在海洋生态系统的物质循环和能量流动过程中起着重要作用。本文以2006~2007年于北部湾进行的四个航次的调查数据，分析了北部湾北部浮游植物的种类组成、数量变化、群落结构以及生物多样性，探讨了浮游植物的群落演替和群落相似性及生态连通性的调控机制，获得主要结果如下： （1）北部湾北部浮游植物四季共鉴定273种（含变种和变型），隶属于5门78属，种类组成以广温类和暖水类为主 ...
王符菁
core
Lessons from an eradication under multiple constraints of an island rat population of record density
Conservation Biology, EarlyView.Abstract Invasive rats threaten island biodiversity, disrupting ecosystems and endangering native species. Although rat eradication has succeeded on many islands, tropical islands present unique management challenges. Strict regulations and financial constraints on some tropical islands further limit proven eradication methods, complicating rodent ...
Tatiane Micheletti +7 more
wiley +1 more source
野生动物学报, 2021 2016年11月—2019年3月，采用“点样带法”对云南异龙湖冬季水鸟群落进行研究，共记录冬季水鸟8目14科59种，其中，2016—2017年调查到6目10科41种；2017—2018年调查到8目14科56种；2018—2019年调查到8目14科59种。从水鸟群落组成的年度动态图上看，物种数呈增加趋势，最多出现在2018—2019年，记录59种；从水鸟物种数量的年度动态图上看，物种数呈先增加后减少趋势，最多出现在2017—2018年。冬季水鸟物种数及个体数呈逐年增加，2016 ...
马国强 1 +1 more
doaj
, 2011 生物多样性是人类生存的基础,而自然保护区是生物多样性保护的重要方式,建立合理的生物多样性测度体系是自然保护区建设的重要方面.自然保护区的生物多样性包括三个方面:容量、通量和质量,它们从不同的侧面测度自然保护区的生物多样性.容量指自然保护区内生态系统类型、物种数的绝对多度和相对多度.物种丰富度是衡量生物多样性容量的较好的指标.通量是指不同自然保护区之间在生态系统类型或物种组成上的相似性与连通性,可以采用β多样性来衡量,如Cody指数和Li指数.当保护区之间的通量值较低时,需要进行整体插值,建立新的保护区 ...
巫渭欢, 李振基, 陈圣宾
core
A link between increased temperature and avian body condition in a logged tropical forest
Conservation Biology, EarlyView.Abstract The combined effects of anthropogenic disturbances, such as logging and climate change, remain poorly understood; yet, they are the main threats to tropical biodiversity. Most tropical African countries lack long‐term climate data, so climate impacts on biodiversity cannot be assessed.
Moreen Uwimbabazi +7 more
wiley +1 more source
How much biotic nativeness matters across human demographic groups
Conservation Biology, EarlyView.Abstract Many central concepts of conservation biology—such as nativeness—are structured by ecological and social factors. However, the social consequences of using these concepts to make conservation decisions remain inadequately understood. Some researchers argue that nativeness, rather than acting as an objective proxy for important ecological ...
Harold N. Eyster, Rachelle K. Gould
wiley +1 more source