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Divergent growth response of Qinghai spruce to recent climate warming in the arid northeastern Tibet Plateau 青藏高原东北干旱区青海云杉对近期气候变暖的差异生长响应
Q2 GEOGRAPHY Pub Date : 2017-07-03 DOI: 10.1080/10225706.2017.1394886
Feng Chen, Huiqing Wang, Yu-jiang Yuan
ABSTRACT Divergent responses of tree growth to climate change have been widely reported from the high altitude forests of the Northern Hemisphere. Here, we developed tree-ring width (TRW) and maximum latewood density (MXD) chronologies for the Qinghai spruce (Picea crassifolia) from three sites (DHS, XXG, and TLC) with different hydrothermal conditions in the arid northeastern Tibetan Plateau, and we used these chronologies to observe climate-growth relationships and divergent growth responses of the Qinghai spruce. Cross correlations showed highly significant divergences among the TRW and MXD chronologies. Precipitation was most strongly related to TRW in different spruce trees. At the upper treeline site (XXG) and at the relatively wet site (TLC), where growth was limited by temperature, MXD showed similar growth trends over time. At the dry site (DHS), TRW showed a strong drought stress signal over time, and MXD lost sensitivity to temperature variations. We would like to highlight the necessity for additional studies investigating possible non-stationary growth responses of trees that are experiencing climate warming, especially for studies of MXD at dry sites that are used for temperature reconstruction in arid areas.
北半球高海拔森林树木生长对气候变化的不同响应已被广泛报道。本文在青藏高原东北部干旱地区不同热液条件下的3个样地(DHS、XXG和TLC)建立了青海云杉(Picea crassifolia)的树轮宽度(TRW)和最大晚木密度(MXD)年代学,并利用这些年代学观察了青海云杉的气候-生长关系和不同的生长响应。交叉相关表明,TRW和MXD年表存在高度显著的差异。在不同的云杉树种中,降水与TRW的关系最为密切。在上树线样地(XXG)和生长受温度限制的相对湿润样地(TLC), MXD随时间的增长趋势相似。在干旱点(DHS), TRW表现出强烈的干旱胁迫信号,而MXD对温度变化失去敏感性。我们想强调的是,有必要对正在经历气候变暖的树木可能的非平稳生长响应进行更多的研究,特别是对用于干旱地区温度重建的干燥地点的MXD进行研究。
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引用次数: 2
Summer climate implications of tree-ring latewood width: a case study of Tsuga longibracteata in South China 树轮晚木宽度对夏季气候的影响——以华南长苞杉木为例
Q2 GEOGRAPHY Pub Date : 2017-07-03 DOI: 10.1080/10225706.2017.1377623
Yesi Zhao, Jiangfeng Shi, Shiyuan Shi, Bowen Wang, Jian Yu
ABSTRACT Summer climate variability in South China at decadal scales is not well understood due to the relatively short meteorological records and the scarcity of paleo-proxies. Herein, we explore the potential of using tree-ring latewood width (LWW) from Tsuga longibracteata to reconstruct summer climatic factors. Latewood usually forms in the mid- to late growing season, at least partly during summer. Tree-ring samples were collected at three sites (HS, QSZ, and SJD) close to the northern boundary of Guangxi province. We built three LWW chronologies and three adjusted LWW chronologies (LWWadj) after the removal of the influence of earlywood on latewood growth. Bootstrapped correlation and response analyses indicate that the LWW chronologies are significantly correlated with summer climatic factors, and the LWWadj chronologies show much higher correlations. The extent to which summer climatic signals can be extracted from LWWadj is site-dependent. At the well-drained sites (QSZ and SJD) with abundant sunshine, LWWadj shows significant positive correlations with July–August Standardised Precipitation-Evapotranspiration Index (SPEI), owing to the positive response to precipitation and the negative response to temperature. In contrast, LWWadj only exhibits positive responses to July temperature on north-oriented slope (HS) with high water-holding capacity. Nearly 37% of the variance in the regional SPEI can be explained by the LWWadj chronology from the forest stand (QSZ) on well-drained southeast-facing slope with less endogenous disturbances. These results indicate that there is a great potential of using LWWadj to reconstruct summer SPEI in South China when suitable sampling sites are selected.
由于相对较短的气象记录和缺乏古代用物,中国南方夏季气候在年代用尺度上的变化尚未得到很好的理解。本文探讨了利用长苞杉树轮晚木宽度(LWW)重建夏季气候因子的潜力。晚木通常在生长季节的中后期形成,至少部分在夏季形成。在靠近广西北部边界的HS、QSZ和SJD 3个站点采集了树木年轮样本。在排除了早木对晚木生长的影响后,我们建立了3个LWW年表和3个调整后的LWW年表(LWWadj)。自举相关和响应分析表明,LWW年代学与夏季气候因子具有显著的相关关系,其中LWWadj年代学表现出更高的相关性。从LWWadj中提取夏季气候信号的程度取决于地点。在日照充足、排水良好的地点(QSZ和SJD), LWWadj与7 - 8月标准化降水蒸散发指数(SPEI)呈显著正相关,表现为对降水的正响应和对温度的负响应。相比之下,LWWadj仅在持水量较大的北向坡面对7月气温有正响应。近37%的区域SPEI变化可以用排水良好的东南坡林分(QSZ)的LWWadj年代学来解释,内源干扰较小。这些结果表明,如果选择合适的采样点,利用LWWadj重建华南夏季SPEI具有很大的潜力。
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引用次数: 11
Dynamics of climatic and anthropogenic stressors in risking island-char livelihoods: a case of northwestern Bangladesh 威胁岛屿木炭生计的气候和人为压力源的动态:以孟加拉国西北部为例
Q2 GEOGRAPHY Pub Date : 2017-07-03 DOI: 10.1080/10225706.2017.1354770
Choyon Kumar Saha
ABSTRACT Livelihood in developing countries draws grave attention to the climatic and anthropogenic stressors that contribute to risk the livelihood despite diversification, and thus wane people’s adaptive capacity and capabilities to cope with unanticipated shocks. Following stratified purposive sampling techniques, a total of nine focus group sessions were performed at three island-chars of Mahishkhocha union in Lalmonirhat district, from February to May in 2013, and explores current livelihood practices and likely risks. The analysis explores evolving risks sprouted from climatic stressors including riverbank erosion, flooding, cold wave, erratic rainfalls and droughts that contribute to livelihood disturbances and slothful processes of sustainable livelihood renewal. The findings suggest that risks are compounded by anthropogenic stressors classifying into state and non-state engagements across manifold institutional scales and policy arrangements, providing insight for promoting rural livelihoods through different actors, formal and informal institutions. Despite challenges to addressing likely risks at different scales, this research demonstrates how public policies can elevate adverse conditions for the emergence of sustainable livelihood pathways.
摘要发展中国家的生计引起了人们对气候和人为压力的严重关注,尽管多样化,但这些压力会危及生计,从而削弱人们应对意外冲击的适应能力和能力。根据分层目的性抽样技术,2013年2月至5月,在Lalmonirhat区Mahishkhocha联盟的三个岛屿上共进行了九次焦点小组会议,探讨了当前的生计做法和可能的风险。该分析探讨了气候压力引发的不断变化的风险,包括河岸侵蚀、洪水、寒潮、不稳定的降雨量和干旱,这些都会导致生计紊乱和可持续生计更新的缓慢过程。研究结果表明,人为压力源在多个机构规模和政策安排上分为国家和非国家参与,从而加剧了风险,为通过不同行为者、正式和非正式机构促进农村生计提供了见解。尽管在应对不同规模的可能风险方面存在挑战,但这项研究表明,公共政策如何提高可持续生计途径出现的不利条件。
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引用次数: 5
Probing the position of the Jakarta metropolitan area in global inter-urban networks through the lens of manufacturing firms 通过制造企业的视角探讨雅加达大都市区在全球城市间网络中的地位
Q2 GEOGRAPHY Pub Date : 2017-07-03 DOI: 10.1080/10225706.2017.1387161
G. Indraprahasta, B. Derudder
ABSTRACT This paper presents an analysis of the position of the Jakarta metropolitan area (JMA) in global inter-urban networks. Our starting point is our aim to provide a more nuanced understanding of the JMA’s connectivity in world city networks (WCNs). To this end, we steer clear of top-down approaches, which tend to analyze cities in singular taxonomies of global prominence, and instead propose a framework that is attuned to the JMA’s contexts to provide an alternative and complementary reading of how the JMA has been inserted into the WCN. To this end, by drawing on the interlocking network model, which helps to proxy inter-urban networks based on the multi-locational operations of manufacturing firms, we examine the JMA’s network positionality on the global and national scales. The results provide evidence of the JMA’s global inter-city relations being strongly geared toward East Asian cities. In addition, the results suggest that the JMA cannot be detached from its national geography, as evidenced by its strong connections with cities located on the island of Java.
摘要本文分析了雅加达都会区(JMA)在全球城市间网络中的地位。我们的出发点是,我们的目标是对JMA在世界城市网络(WCN)中的连接提供更细致的理解。为此,我们避开了自上而下的方法,这种方法倾向于以全球突出的单一分类法来分析城市,而是提出了一个与JMA背景相适应的框架,以提供对JMA如何插入WCN的替代和补充解读。为此,通过借鉴有助于代理基于制造企业多地点运营的城市间网络的互锁网络模型,我们检验了JMA在全球和国家尺度上的网络定位。研究结果证明,JMA的全球城市间关系正大力向东亚城市倾斜。此外,研究结果表明,JMA不能脱离其国家地理,其与爪哇岛城市的紧密联系就是明证。
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引用次数: 8
A pragmatic assessment of livelihood status in the peri-urban interface: a case from developing India 城郊结合部生计状况的实用评估:以发展中印度为例
Q2 GEOGRAPHY Pub Date : 2017-01-02 DOI: 10.1080/10225706.2017.1296366
N. Banu, Shahab Fazal
ABSTRACT The present study is an attempt to depict the picture of livelihoods and its sustainability in the transforming economy of peri-urban interface (PUI). The study assumes that process of peri-urbanization adds complexity to household livelihood security and the process of peri-urbanization has been considered as stress. To measure this stress, the study adopts the Sustainable Livelihood Approach targeted to understand the livelihood status of households. It also evaluates the coping strategies adopted by households for surviving in transforming economic and social PUI environment.
摘要本研究试图描绘城市周边界面(PUI)转型经济中的生计及其可持续性。本研究假设,围城市化进程增加了家庭生计保障的复杂性,而围城市化过程被认为是压力。为了衡量这种压力,该研究采用了可持续生计方法,旨在了解家庭的生计状况。它还评估了家庭在转变的经济和社会PUI环境中为生存而采取的应对策略。
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引用次数: 6
Regulating post-disaster reconstruction planning in China: towards a resilience-based approach? 规范中国灾后重建规划:走向基于复原力的方法?
Q2 GEOGRAPHY Pub Date : 2017-01-02 DOI: 10.1080/10225706.2017.1328606
Yiwen Shao, Jiang Xu
ABSTRACT There has been a growing tendency in recent years to use resilience theory when drawing up guidelines for formulating urban plans. However, restorative resilience analysis, which is the application of resilience thinking to introspect the planning system, has not yet been well addressed in existing academic inquiry. This article attempts to fill this gap by examining whether urban resilience features in China’s reconstruction planning regulation on different geographical levels, using carefully selected proxy resilience attributes. Reconstruction planning legislation and policies (RPLPs) are the focus of this study because they are perceived to play an important potential role in defining normative planning discourses and legitimizing planning practices. The article develops three major arguments. Firstly, while urban resilience does not yet feature explicitly on the agenda for reconstruction planning in China, specifications of RPLPs do convey certain attributes of urban resilience, but in a distorted form which reflects a failure to fully represent the evolutionary resilience perspective. Secondly, these RPLPs enable, at least rhetorically, a highly connected and efficient environment for post-disaster reconstruction efforts across levels and among institutions, especially through the adoption of a multilayered partner support program (PSP). Thirdly, based on the second argument, resilience is more usefully interpreted as a process rather than an outcome, as the performance of planning regulations would suggest. These arguments are elaborated through a case study of reconstruction planning in Wenchuan County following the 2008 Sichuan Earthquake.
摘要近年来,在制定城市规划指南时,越来越多地使用弹性理论。然而,恢复性弹性分析,即应用弹性思维反思规划系统,在现有的学术研究中尚未得到很好的解决。本文试图通过使用精心选择的代理弹性属性,在不同地理层面上考察中国重建规划法规中的城市弹性特征,来填补这一空白。重建规划立法和政策(RPLP)是本研究的重点,因为它们被认为在定义规范的规划话语和使规划实践合法化方面发挥着重要的潜在作用。这篇文章提出了三个主要论点。首先,虽然城市韧性尚未明确列入中国重建规划的议程,但RPLP的规范确实传达了城市韧性的某些属性,但形式扭曲,反映了未能充分代表进化韧性的观点。其次,这些RPLP至少在口头上为各级和各机构的灾后重建工作提供了一个高度互联和高效的环境,特别是通过采用多层次的合作伙伴支持计划(PSP)。第三,根据第二个论点,正如规划条例的执行情况所表明的那样,弹性被更有效地解释为一个过程,而不是一个结果。这些论点是通过2008年四川地震后汶川县重建规划的案例研究来阐述的。
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引用次数: 8
Surface temperature variability analysis of an urban area using Landsat ETM+ thermal images 基于Landsat ETM+热图像的城市地表温度变化分析
Q2 GEOGRAPHY Pub Date : 2017-01-02 DOI: 10.1080/10225706.2017.1322992
D. Kumar
ABSTRACT The issues relating to global warming and urban heat island have praised the global inclination toward the study of surface temperature (ST) variations. ST is undeniably considered as one of the most significant parameters to assess the impact of temperature variability in any urban environment. The present work tries to extend the work beyond the thermal image processing for variability analysis with a multiscale cell division approach. Subsequently, a radical approach in conjunction with formal statistical techniques is attempted to characterize the spatial variability for the directional attributes. These methods may be helpful in detecting and quantifying the spatial variability at major and minor scales. The spatial variability is investigated to illustrate the spatial distribution of temperature over urban–rural (Rurban) areas contributing to the heat island. The results seemingly revealed that there is an aggregation of the spatial thermal gradient along Rurban areas and vice versa, whereas urban fringe exhibited very complex results of temperature variability for the various land use. The study also validated the approaches for integration of spatial variability techniques with the formal statistical approach as a reliable mechanism to monitor the thermal dynamics in the urban environment.
摘要与全球变暖和城市热岛有关的问题赞扬了全球对地表温度变化研究的倾向。不可否认,ST被认为是评估任何城市环境中温度变化影响的最重要参数之一。本工作试图将工作扩展到热图像处理之外,用多尺度细胞分裂方法进行变异性分析。随后,尝试将一种激进的方法与形式统计技术相结合,来表征方向属性的空间可变性。这些方法可能有助于检测和量化大尺度和小尺度的空间变异性。对空间变异性进行了研究,以说明城市-农村(Rurban)地区的温度空间分布对热岛的影响。结果似乎表明,Rurban地区的空间热梯度是聚集的,反之亦然,而城市边缘地区在各种土地利用中表现出非常复杂的温度变化结果。该研究还验证了将空间变异性技术与形式统计方法相结合的方法,将其作为监测城市环境热动力学的可靠机制。
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引用次数: 2
An archipelagic tourism development model: the case of Okinawa Prefecture 群岛旅游开发模式:以冲绳县为例
Q2 GEOGRAPHY Pub Date : 2017-01-02 DOI: 10.1080/10225706.2017.1323654
David N. Nguyen
ABSTRACT This paper advances geographic theoretical models on the spatial and temporal effects of tourism development and modifies them to analyze archipelagic destinations. Using Okinawa, Japan, as a case study, changes in the distribution of resort hotels, transportation linkages, tourism numbers, and development policies are examined over a period of 40 years. The results of this empirical study suggest that Okinawa’s development corresponds very closely to the archipelagic model which, in turn, corresponds to other similar models predicting the spread of tourism.
摘要本文提出了旅游发展时空效应的地理理论模型,并对其进行了修正,以分析群岛目的地。以日本冲绳为例,研究了40年来度假酒店分布、交通联系、旅游业数量和发展政策的变化。这项实证研究的结果表明,冲绳的发展与群岛模型非常吻合,而群岛模型又与预测旅游业传播的其他类似模型相吻合。
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引用次数: 3
Tree-ring based February–April relative humidity reconstruction since A.D. 1695 in the Gaoligong Mountains, southeastern Tibetan Plateau 1695年以来基于树木年轮的青藏高原东南部高黎贡山2-4月相对湿度重建
Q2 GEOGRAPHY Pub Date : 2017-01-02 DOI: 10.1080/10225706.2017.1325758
Yuming Jiang, Zongshan Li, Z. Fan
ABSTRACT High-resolution proxy data are limited in the southeastern Tibetan Plateau, which inhibits our understanding of long-term climate variability in historical periods. In this study, we developed one tree-ring-width chronology of Tsuga dumosa (D. Don Eichler) in the Gaoligong Mountains, southeastern Tibetan Plateau. Tree-ring-width chronology showed negative correlations with monthly temperatures in most months, especially for current year, whereas correlations with precipitation and relative humidity were mostly positive. Significant positive correlations were found between tree rings and relative humidity in February, April and June of current year and May of previous year. February–April relative humidity was reconstructed for the past 321 years (A.D. 1695–2016) in the Gaoligong Mountains, which explained 26% of the actual variance during the calibration period 1962–2004. In this reconstruction, dry periods occurred in 1808–1820, 1831–1842, 1914–1921, 1958–1964 and 1980–1988. Wet periods were found in 1700–1727, 1821–1830, 1843–1859, 1944–1957 and 1965–1979. The dry and wet episodes of our relative humidity reconstruction match well other studies in the nearby regions, which demonstrate that the new record is reliable and captures large-scale climate signals.
摘要青藏高原东南部的高分辨率代理数据有限,这阻碍了我们对历史时期长期气候变化的理解。在本研究中,我们建立了青藏高原东南部高黎贡山杜摩沙(D.Don Eichler)的一个树木年轮宽度年表。年轮宽度年表在大多数月份,尤其是当年,与月气温呈负相关,而与降水量和相对湿度呈正相关。树木年轮与当年2月、4月、6月和上年5月的相对湿度呈显著正相关。对高黎贡山过去321年(公元1695年至2016年)的2月至4月相对湿度进行了重建,这解释了1962年至2004年校准期间26%的实际变化。在这次重建中,干旱期发生在1808年至1820年、1831年至1842年、1914年至1921年、1958年至1964年和1980年至1988年。在1700–1727年、1821–1830年、1843–1859年、1944–1957年和1965–1979年发现了雨季。我们相对湿度重建的干湿事件与附近地区的其他研究非常吻合,这表明新记录是可靠的,并捕捉到了大规模的气候信号。
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引用次数: 13
The role of private sector in built heritage conservation: a case study of Xinhepu, Guangzhou 私营部门在建筑遗产保护中的作用——以广州新合浦为例
Q2 GEOGRAPHY Pub Date : 2016-07-02 DOI: 10.1080/10225706.2016.1250645
Anna Ka-yin Lee
ABSTRACT The pursuit of cultural heritage conservation is particularly problematic in China as the country has been undergoing substantial changes in its governance processes in the post-reform era. As the regime becomes less authoritarian and more pluralized, a multitude of stakeholders (both state and non-state), are now involved in promoting, constructing, challenging and safeguarding a variety of meanings and values in heritage. This paper focuses the attention on the market sector and examines the extent of market forces in contributing to effective heritage conservation using the designated historic district of Xinhepu in the old residential district of Yuexiu in Guangzhou as a case. The concept of neoliberalism implies a larger role played by the market, which is defined as investment, expertise and innovations from the private operators. Informed by a review of relevant documents and publications, and semi-structured interviews with Guangzhou-based state- and non-stakeholders who have extensive knowledge on managing the historic district, this paper examines the achievements and difficulties of individual private operators face in protecting heritage buildings and historic buildings on the site. The findings suggest that Guangzhou has yet to fully embrace a neoliberal approach to heritage conservation. The conditions of extending market forces to successfully conserve the entire historic district include the formulation of a clear set of regulatory rules and the presence of implementing agencies with enhanced institutional and organizational strength, both of which are regrettably absent in the case.
文化遗产保护在中国尤其成问题,因为中国在后改革时代的治理过程中经历了重大变化。随着政权变得不那么专制和更加多元化,众多利益相关者(包括国家和非国家)现在都参与到促进、构建、挑战和保护遗产的各种意义和价值中来。本文以广州越秀区旧住宅区新合浦指定历史街区为例,将注意力集中在市场领域,考察市场力量对有效遗产保护的贡献程度。新自由主义的概念意味着市场发挥更大的作用,它被定义为来自私人经营者的投资、专业知识和创新。通过查阅相关文件和出版物,以及对广州的国有和非利益相关者进行半结构化访谈,本文考察了个体私营经营者在保护遗址上的文物建筑和历史建筑方面所面临的成就和困难。调查结果表明,广州尚未完全接受新自由主义的遗产保护方法。扩大市场力量以成功地保护整个历史街区的条件包括制订一套明确的管理规则,并有加强体制和组织力量的执行机构存在,令人遗憾的是,这两者在本案例中都没有。
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引用次数: 6
期刊
Asian Geographer
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