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Conservation of agro-biodiversity in Baja California oases.

机译:下加利福尼亚州绿洲农业生物多样性的保护。

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摘要

Agro-biodiversity in the desert oases of Baja California, Mexico is a product of isolation and integration through time and across the various spaces of the peninsula. The oases hold heirloom perennial crop species first introduced by Jesuit missionaries (1697-1768) and represent geographies of historical dissemination. I selected fifteen Jesuit mission oases and surveyed the oasis gardens for species richness and abundance. To understand the cultural, political and economic forces that create these patterns of persistence within the oases, I conducted interviews on farming system practices, geographical remoteness, market integration, land tenure, tourism, protected area status and cultural practices. In all, I surveyed 241 gardens and documented eighty-nine total perennial crop species. Historical records in 1774 describe twenty-one perennial crop species in cultivation after the Jesuit expulsion. I calculated species-area relationships and rank-abundance for total perennial and mission crop species in each oasis and inventory comparisons for those oases with quantitative historical data to analyze retention of historic mission species. A high persistence of mission species indicates that oases serve as agro-biodiversity refugia, or protected source areas for agricultural species. These mission-oases act as a network of interconnected sites that are also isolated from one another and the Mexican mainland by the rugged environment, limited transportation infrastructure, and by sea. Within the network, these fifteen oases span a range of small and hours distant from the nearest resource center, to fully urbanized with international ports and airports. I describe how phases and processes of isolation and connectivity shape and transform the agro-biodiversity profiles in this archipelago of peninsula oases.
机译:墨西哥下加利福尼亚沙漠绿洲中的农业生物多样性是随着时间的推移以及整个半岛各个空间之间的隔离和融合的产物。绿洲拥有传家宝多年生作物物种,最初是耶稣会传教士(1697-1768)引入的,代表着历史传播的地理区域。我选择了15个耶稣会任务绿洲,并调查了绿洲花园中物种的丰富度和丰富度。为了了解在绿洲内造成这种持久性模式的文化,政治和经济力量,我对农业制度的实践,地理偏远,市场整合,土地保有权,旅游,保护区的地位和文化实践进行了采访。我总共调查了241个花园,并记录了89种多年生作物。 1774年的历史记录描述了耶稣会士驱逐后种植的21种多年生作物物种。我计算了每个绿洲中多年生和使命作物总物种的物种-面积关系和等级-丰度,并通过定量历史数据对这些绿洲的库存比较进行了分析,以分析历史使命物种的保留。任务物种的高度持久性表明,绿洲可作为农业生物多样性的避难所或农业物种的受保护源地。这些任务绿洲是一个相互连接的站点的网络,这些站点之间也因恶劣的环境,有限的交通基础设施以及海上而彼此隔离。在网络内部,这十五种绿洲跨越了距离最近的资源中心仅几小时之遥的范围,并通过国际港口和机场完全实现了城市化。我描述了隔离和连通性的阶段和过程如何塑造和改变这个半岛绿洲中的农业生物多样性状况。

著录项

  • 作者

    Routson, Rafael.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Geography.;Biology Conservation.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 417 p.
  • 总页数 417
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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