...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Permanent salt evaporation ponds in a semi-arid Mediterranean region as model systems to study primary production processes under hypersaline conditions
【24h】

Permanent salt evaporation ponds in a semi-arid Mediterranean region as model systems to study primary production processes under hypersaline conditions

机译：地中海半干旱地区的永久盐蒸发池，作为研究高盐条件下初级生产过程的模型系统

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A change from planktonic to benthic primary production was observed along an increasing salinity gradient in a permanent solar saltpan sequence (Las Salinas del Pinet) in a semi-arid Mediterranean region (Spain). The biomass and photosynthesis of the water column decreased greatly when salinity increased, while benthic production increased when cyanobacteria crusts developed. This produced a change from autotrophic to heterotrophic in water column productivity. However in the benthos, the changes from heterotrophic to autotrophic were seen throughout the pond sequence. Changes in phytoplankton composition in the studied saltern appeared more influenced by phytoplankton salinity tolerance since 88.0% of variation in the photosynthesis rates and 76.0% in the respiration rates were negatively and positively explained by increased salinity, respectively. However the changes in the benthos composition did not appear to be highly influenced by the benthos salinity tolerance since only half of the variation in the photosynthesis rates were explained by increased salinity. A lack of correlation between the respiration and photosynthesis benthic values can be explained by the oxygen consumed by heterotrophic organisms and by chemical demand. The nutrients system varied seasonally in this saltern, and this variability appeared to relate to the occurrence of the evaporative concentration of water and bacterial activity. This study highlighted that stressors such as water salinity should be considered in future hydrological management plans in order to preserve water resources, especially in warmer and drier climates.
机译：在半干旱的地中海区域（西班牙），随着永久性盐池序列（Las Salinas del Pinet）中盐度梯度的增加，观察到浮游生物向底栖生物的变化。当盐度增加时，水柱的生物量和光合作用大大降低，而当蓝藻结壳形成时底栖生物产量增加。这使水柱生产率从自养型变为异养型。但是在底栖动物中，在整个池塘中都可以看到从异养到自养的变化。在研究的盐沼中，浮游植物组成的变化似乎受浮游植物盐度耐受性的影响更大，因为光合作用变化的88.0％和呼吸频率的变化的76.0％分别由盐度的增加带来了负面和正面影响。然而，底栖生物组成的变化似乎不受底栖生物盐度耐受性的很大影响，因为光合作用变化的仅一半变化是由盐度增加所解释的。呼吸作用和光合作用底栖值之间缺乏相关性可以用异养生物消耗的氧气和化学需量来解释。在这个盐罐中，养分系统随季节变化，这种变化似乎与水的蒸发浓度和细菌活性的发生有关。这项研究强调，在未来的水文管理计划中应考虑诸如盐度之类的压力因素，以保护水资源，尤其是在温暖和干燥的气候中。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号