Revitalizing ecological capital     

Paul Swagemakers  Johannes S.C. Wiskerke 《Geografisk tidskrift / udgivet af Bestyrelsen for Det Kongelige danske geografiske selskab》2013,113(2):149-167

Geografisk Tidsskrift-Danish Journal of Geography 111(2):149–167, 2011

The modernization of agricultural food production has diminished and is diminishing the sustainable use of the local natural resource base, resulting in the fragmentation of landscapes and the decline of biodiversity. In this paper we analyze the revitalization of ecological capital, which provides insights into how effective adjustments in land-use and farming practices can stimulate a reconnection between farming, nature and society. The paper focuses on a case study about endogenous knowledge on the relation between farm activities and the reproduction of the landscape and its flora and fauna in the (Dutch) Friesian Woodlands. We suggest that building adequate, local institutional frameworks that strengthen landscape structures, regional identity and the ‘branding’ of food products will sustain rural development in the area. The results should be of value for increasing the understanding among researchers and policymakers of the potential of endogenous knowledge in governing the increase of the ecological stock in an area.  相似文献   

新疆数字化近震记录特征     

冉慧敏  段天山  赵庆  冯雪玲 《地震地磁观测与研究》2013,34(3)

对2009年2月至2011年8月新疆及边境界外300 km以内Ms3.0以上523个天然地震重新分析,研究新疆数字化近震记录,总结震相规律,地震实例说明:不同距离、不同类型的天然地震记录特征,对提高新疆数字台网中心的地震速报及地震目录编辑质量具有借鉴意义.  相似文献   

Towards flexible groundwater-level prediction for adaptive water management: using Facebook’s Prophet forecasting approach     

H. Aguilera  N. Naranjo-Fernández  C. Kohfahl 《水文科学杂志》2013,58(12):1504-1518

ABSTRACT

There is an increasing need for accurate groundwater-level (GWL) prediction to support effective seasonal water management. It is desirable for forecasting tools to be not only accurate but also accessible for decision-makers. We test the Prophet forecasting procedure, an open-source code released by Facebook, to address these challenges. It is based on an additive model considering non-periodic changes and periodic components in a Bayesian framework with easily-interpretable parameters. Predictions of daily GWL data in an area affected by pumping near a tourist complex in the Ramsar wetland area of Doñana (Spain) are compared to other forecasting methods. Prophet outperforms most methods in predicting GWL making it a fast and flexible forecasting tool for hydrologists and water managers. Furthermore, it allows gaining insight into the influence of each component of the forecast separately, helping to assess the hydrodynamic response to external drivers such as groundwater pumping.  相似文献   

用面波联合勘探技术探测浅部速度结构   总被引：3，自引：0，他引：3  

张维  何正勤  胡刚  李俊 《地球物理学进展》2013,28(4)

瑞雷面波勘探技术以其快速经济、受场地条件限制小等优点广泛应用于浅部横波速度结构探测.人工源面波勘探方法对浅部地层的探测精度高,但探测深度较浅;天然源面波勘探方法探测深度较深,但对浅部速度结构的探测精度不高.本文在夏垫和玉溪两地分别开展了人工源和天然源面波联合探测试验,尝试采用不同排列和相同排列两种方法,采集人工源和天然源面波信息,联合处理数据并提取频散曲线,反演得到浅部地层的横波速度结构.探测结果表明:人工源和天然源面波联合勘探,尤其是采用相同排列的方法,可以在几乎不增加常规面波勘探工作量的条件下,既能保证浅部地层的探测精度,又明显拓展探测深度,大大提升了面波勘探能力,有望在工程勘察领域中推广应用.  相似文献   

提高盘锦湿地芦苇产量的对策分析     

李东  孙德超  胡艳玲 《湿地科学与管理》2013,(1):48-50

阐述了目前盘锦芦苇湿地的生产现状,分析了制约芦苇产量的主要因素,提出了提高芦苇产量的有效对策,并全面分析了实施各项对策后产生的经济效益、生态效益和社会效益,以期为盘锦芦苇产业发展提供科学依据和实用技术指导。  相似文献   

城市湿地特征及其生态恢复   总被引：1，自引：0，他引：1  

刘令聪  林萍  汪学华  殷海康  郭绪虎 《湿地科学与管理》2013,(1):54-56

通过对城市湿地功能和特征以及城市化进程中城市湿地面积缩减、水质污染及功能退化等问题的分析,揭示城市湿地退化的主要原因,依据结构决定功能的生态学原理,提出湿地退化恢复的实质是结构的修复,城市湿地的恢复应采取汇水区水源保护、汇水净化治理、入湖河流截污、河道修复及重建湖滨结构的城市湿地恢复策略。  相似文献   

中国退化湿地生态恢复     

谢冬  周恒杰  纪海婷  安树青 《资源与生态学报(英文版)》2013,(1):63-69

湿地是地球上最重要的生态系统之一。然而,随着人口和经济的快速增长,加之长期过度开发已经使得我国的湿地生态系统已经不堪重负。因此,为了改善和恢复湿地的多种功能,如减缓径流、蓄洪防旱,净化水质等,在适当的地域恢复和重建湿地是当今我们面临的紧迫问题。本文从退化湿地生态恢复的基本概念入手,阐述了湿地恢复的基本原理以及湿地恢复的基本流程;以生态学原理为基础,分别阐述了退化湿地生态恢复的三个基本模式,以及退化湿地生态恢复的主要目标和基本策略;最后还对湿地恢复项目的评估和未来发展趋势进行了探讨。  相似文献   

埕南断裂带埕913砾岩体成藏地质条件及勘探开发实践          下载免费PDF全文

王绍光 《山东国土资源》2003,19(Z1):68-71

从圈闭特征、生油条件、盖层条件和砾岩体的储集条件等方面对济阳拗陷埕913区块进行了地质研究;细分了沉积微相,对砂砾岩扇体进行了精细描述,摸索出储层压裂改造方案,总结出一套砾岩复杂岩性油藏的研究思路和技术方法。  相似文献   

Holocene environmental history of a freshwater wetland in southern Louisiana: a sedimentary record of delta development,coastal evolution and human activity     

Junghyung Ryu  Kam-Biu Liu  Thomas A. Bianchette 《第四纪科学杂志》2021,36(6):980-990

The world's most extensive and active deltas, Louisiana's wetlands, are deteriorating rapidly due to multiple stressors. Their ecological and anthropogenic histories on a multimillennial timescale have not been thoroughly documented. This study investigates hydrological and anthropogenic impacts on southern Louisiana wetlands to guide future efforts toward environmental restoration. A 3.6 m sediment core (JOYWMA) extracted from a freshwater wetland adjacent to Lake Pontchartrain yielded a 5000-year record. Multiproxy data indicate four distinct stages, with the earliest period representing an oyster reef (~4.5 cal yr bp ) marked by elevated Ca and Sr concentrations. Evolution to a freshwater marsh occurred 4.5–4.0 cal yr bp during the St. Bernard delta progradation, marked by increased Zr and Br concentrations. The site transitioned to a lake due to the isolation from the St. Bernard delta and local subsidence (4.0–2.0 cal yr bp ), marked by increased Ti, Fe, Mn and K concentrations. The site altered to a cypress swamp after 2.0 cal yr bp due to increased sediment supply during the St. Bernard subdelta progradation. Both natural (delta progradation and subsidence) and anthropogenic (fire, deforestation) stressors have impacted the site over the last 4500 years. Delta-switching of the Mississippi River caused the significant geomorphological and ecological changes.  相似文献   

Groundwater recharge from an oxbow lake-wetland system in the Mississippi Alluvial Plain     

Michael C. Gratzer  Gregg R. Davidson  Andrew M. O'Reilly  James R. Rigby 《水文研究》2020,34(6):1359-1370

The Mississippi River Valley Alluvial Aquifer ranks among the most overdrafted aquifers in the United States due to intensive irrigation. Concern over declining water levels has increased focus on understanding the sources of recharge. Numerous oxbow lakes overlie the aquifer that are often considered hydraulically disconnected from the groundwater system due to fine-grained bottom sediments. In the current study, groundwater levels in and around a 445-ha oxbow lake-wetland in Mississippi were monitored for a 2-year period that included an unusually long low-water condition in the lake (>17 months), followed by a high-water event lasting over 4 months before returning to earlier low-water levels. The high-water pulse (>4 m rise) provided a unique opportunity to track the impact in the underlying alluvial aquifer. During low-water conditions, groundwater flowed westward beneath the lake. Following the lake rise, groundwater beneath and near the perimeter responded as quickly as the same day, with more delayed responses moving away from the lake. Within 2 months, a groundwater mound formed near the centre of the oxbow (>3 m increase), with a reversal in the local hydraulic gradient towards the east. Flow returned to a westward gradient when the lake level dropped back below 0.3 m. Analysis of precipitation and nearby river stage could not account for the observed behavior. Recharge to the aquifer is attributed to rising water levels spreading over point bar deposits and into the surrounding forested wetlands where preferential flow pathways are likely to exist due to buried and decomposing tree remains. An earlier study in the wetland demonstrated an increasing redox potential in isolated zones, consistent with the existence of preferential flow pathways through the bottom sediments (Lahiri & Davidson, 2020). Retaining high-water levels in oxbow lakes could be a relatively low-cost water management practice for enhancing aquifer recharge.  相似文献