期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Developing phase of China's system of nature reserves in perspective
1
作者 Xue-Jun OUYANG Wan-Hui YE +2 位作者 Marc HOCKINGS Chung-Lim LUK Zhong-Liang HUANG 《Forestry Studies in China》 CAS 2013年第4期340-348,共9页
Up until 2009, 2541 nature reserves had been established in China. However, the process of developing this system of nature reserves was not quite smooth. Various kinds of information related to nature reserves, such ... Up until 2009, 2541 nature reserves had been established in China. However, the process of developing this system of nature reserves was not quite smooth. Various kinds of information related to nature reserves, such as annual growth, the type of nature reserves established, motives behind building a nature reserve, legal instructions and the constitution of government sectors, were collected and analyzed in order to highlight the characteristics of the development of our nature reserve system. As a result, we identify three phases and their characteristics, i.e., the initial phase from 1956 to 1978, the establishment phase from 1979 to 1996 and the management standardization phase from 1997 to 2009, could be clearly identified. It is suggested that since the establishment of this comprehensive structural framework in China, the system should be entering a new developing phase. We recommend that more attentions should be paid on how to guarantee effective management and how nature reserves are able to maintain their value and fulfill their objectives in the future. 展开更多
关键词 system of nature reserves China developing phase nature conservation jurisprudence types of nature reSerVe
下载PDF
不同程度人为干扰对古田山森林群落谱系结构的影响 被引量:29
2
作者 宋凯 米湘成 +3 位作者 贾琪 任海保 Dan Bebber 马克平 《生物多样性》 CAS CSCD 北大核心 2011年第2期190-196,共7页
群落谱系结构包含群落发育的历史信息,能从新的角度反映群落形成的生态过程。作者在浙江古田山自然保护区亚热带常绿阔叶林中选择了人为干扰强度不同的4种群落类型,以20m×20m为研究尺度探讨了不同干扰程度对群落谱系结构的影响。... 群落谱系结构包含群落发育的历史信息,能从新的角度反映群落形成的生态过程。作者在浙江古田山自然保护区亚热带常绿阔叶林中选择了人为干扰强度不同的4种群落类型,以20m×20m为研究尺度探讨了不同干扰程度对群落谱系结构的影响。结果表明,人工林(类型I)谱系结构发散;但间伐林(类型II)、自然恢复林(类型III)以及自然老龄林(类型IV)谱系结构聚集,且以类型II和IV聚集度最高。进一步分析不同径级谱系结构发现,在中小径级(DBH≤5cm和5cm<DBH≤10cm),类型II、III、IV群落谱系结构聚集,而类型I群落谱系结构发散;但DBH>10cm时,除了类型IV,其他3种群落都是谱系结构发散,这反映了在恢复早期种子扩散对这些林型群落构建影响较大;而皆伐后的演替和间伐增加了群落生境异质性,生境过滤作用增强,使类型II、III群落中小径级谱系结构表现为聚集;类型IV群落不同径级谱系结构均表现为聚集,可能与其稳定的生境过滤作用有关。 展开更多
关键词 群落结构 谱系发散 谱系聚集 径级结构 种子传播 生境过滤
原文传递
浙江古田山亚热带常绿阔叶林不同干扰强度下土壤呼吸的日动态与季节变化 被引量:2
3
作者 宁亚军 陈世苹 +3 位作者 钱海源 任海保 BEBBER Dan 陈建华 《科学通报》 EI CAS CSCD 北大核心 2013年第36期3839-3848,共10页
在浙江古田山常绿阔叶林区域选择了4个具代表性的不同干扰强度森林类型:常绿阔叶老龄林(OF)、一次皆伐后自然恢复的天然次生林Ⅰ(SFI)、皆伐后自然恢复过程中经历一次重度择伐的天然次生林Ⅱ(SFⅡ)、人工杉木林(AF)为研究对象... 在浙江古田山常绿阔叶林区域选择了4个具代表性的不同干扰强度森林类型:常绿阔叶老龄林(OF)、一次皆伐后自然恢复的天然次生林Ⅰ(SFI)、皆伐后自然恢复过程中经历一次重度择伐的天然次生林Ⅱ(SFⅡ)、人工杉木林(AF)为研究对象,进行了为期1年的土壤呼吸动态监测,定量分析了不同林型土壤呼吸的昼夜和季节变化,同时结合相关环境和生物因子的监测,从日尺度和季节尺度上探讨了影响我国亚热带常绿阔叶林区不同森林土壤呼吸的主要驱动因子,并就不同的森林管理方式对亚热带森林土壤碳释放的可能影响做出了初步评估.研究发现4种林型土壤碳日累积释放量呈现显著的季节变化,从5月份开始各林型土壤碳日累积释放量以较快速率升高,老龄林8月中旬达到最大,次生林I在7月中旬达最大,次生林II和人工林在6月中旬达最大,之后各林型持续下降到翌年1月份,而后开始缓慢回升.4种林型年平均土壤碳日累积释放量分别为1.48,1.48,1.51,0.87gcm-2d-1,人工林的土壤碳日累积释放量显著低于其他3种林型.各林型的土壤呼吸速率的日变化幅度均不显著.土壤表层温度是影响该地区土壤呼吸季节动态的主要因素,二者呈显著的指数相关关系,相关系数舻为0.88~0.94;土壤表层含水量与土壤呼吸之间没有显著的相关关系.老龄林土壤温度敏感性(Qzo值)显著高于其他林型.上述结果表明,受干扰强度最大的人工林的土壤呼吸速率显著降低,对温度变化的敏感性显著降低:受干扰强度相对较小的次生林其土壤呼吸速率和温度敏感性基本上和老龄林保持一致.古田山不同林型土壤呼吸季节变化的主要驱动因子均为土壤温度.这些结论说明不同干扰强度对亚热带森林土壤碳释放的影响不同,这为精确估算该地区不同植被类型碳收支提供了重要依据,此外土壤呼吸无显著昼夜变化的结论将对该区域后续的动态监测工作起到积极的指导作用. 展开更多
关键词 亚热带常绿 阔叶林 老龄林 次生林 人工林 土壤呼吸 土壤温度
原文传递
EU-Citizen.Science:A Platform for Mainstreaming Citizen Science and Open Science in Europe 被引量:2
4
作者 Katherin Wagenknecht Tim Woods +5 位作者 Francisco García Sanz Margaret Gold Anne Bowser Simone Rüfenacht Luigi Ceccaroni Jaume Piera 《Data Intelligence》 2021年第1期136-149,共14页
Citizen Science(CS)is a prominent field of application for Open Science(OS),and the two have strong synergies,such as:advocating for the data and metadata generated through science to be made publicly available[1];sup... Citizen Science(CS)is a prominent field of application for Open Science(OS),and the two have strong synergies,such as:advocating for the data and metadata generated through science to be made publicly available[1];supporting more equitable collaboration between different types of scientists and citizens;and facilitating knowledge transfer to a wider range of audiences[2].While primarily targeted at CS,the EU-Citizen.Science platform can also support OS.One of its key functions is to act as a knowledge hub to aggregate,disseminate and promote experience and know-how;for example,by profiling CS projects and collecting tools,resources and training materials relevant to both fields.To do this,the platform has developed an information architecture that incorporates the public participation in scientific research(PPSR)-Common Conceptual Model.This model consists of the Project Metadata Model,the Dataset Metadata Model and the Observation Data Model,which were specifically developed for CS initiatives.By implementing these,the platform will strengthen the interoperating arrangements that exist between other,similar platforms(e.g.,BioCollect and SciStarter)to ensure that CS and OS continue to grow globally in terms of participants,impact and fields of application. 展开更多
关键词 Citizen Science METADATA Open Science Public participation in scientific research(PPSR)
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部