• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Soil Biology & Biochemistry >Biological and microbial activity in biological soil crusts from the Tabernas desert, a sub-arid zone in SE Spain
【24h】

Biological and microbial activity in biological soil crusts from the Tabernas desert, a sub-arid zone in SE Spain

机译：西班牙东南部干旱地区Tabernas沙漠生物土壤结皮中的生物和微生物活性

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

The ecology and functional role of biological soil crusts (BSCs) in arid and semi-arid zones have been extremely well studied. However, little is known about the biochemical properties related to the number and activity of the microbiota that form the crusts, even though information about these properties is very important for understanding many of the processes that affect the formations. In this study, several properties related to the activity and number of microorganisms (biomass-C, basal respiration, dehydrogenase activity and nitrogen mineralization potential) were determined at different depths (crusts, 0-0.5 cm; middle, 0.5-3 cm and deep, 3-5 cm layers) in two types of crusts (predominated by cyanobacteria and by lichens) in the Tabernas desert (Almeria, SE Spain). The absolute values of the above-mentioned properties and the values expressed relative to the total organic carbon (TOC) content were both much higher in the crust layers than in the surface horizons of soils under Mediterranean or Atlantic climates. A large part of the TOC in the BSCs was contained in the microbiota and another large part was readily metabolized during incubation of the crusts for 10 days at 25 degrees C. The net nitrogen mineralization rate was also high, and ammonification predominated in the crust layers, whereas nitrification predominated in the middle and deep layers. In all types of BSCs, the microbiota colonized the deep layers, although with greater intensity in the lichen-dominated BSCs than in the cyanobacterial BSCs. The results also indicate that hydrolytic enzymes are not stabilized on soil colloids and their activity depends only on the active microbiota.
机译：对干旱和半干旱地区生物土壤结皮（BSC）的生态学和功能作用进行了非常深入的研究。但是，关于与形成结壳的微生物群的数量和活性有关的生化特性知之甚少，尽管有关这些特性的信息对于理解影响地层的许多过程非常重要。在这项研究中，在不同深度（结壳，0-0.5厘米;中层，0.5-3厘米，深），确定了与微生物的活性和数量有关的几种特性（生物量-C，基础呼吸，脱氢酶活性和氮矿化潜力）。塔贝纳斯沙漠（西班牙西班牙阿尔梅里亚）的两种类型的地壳（主要由蓝细菌和地衣）组成，厚度为3-5厘米）。在地中海或大西洋气候下，地壳层中上述性质的绝对值和相对于总有机碳（TOC）表示的值均远高于土壤表层。 BSCs中的大部分TOC都包含在微生物群中，而另一部分很容易在地壳在25°C下温育10天期间被代谢。净氮矿化率也很高，并且地壳层中的氨化作用占主导地位。 ，而硝化作用则主要集中在中层和深层。在所有类型的BSC中，微生物群都定居在深层，尽管在以地衣为主的BSC中其强度比在蓝细菌BSC中更大。结果还表明，水解酶在土壤胶体上不稳定，其活性仅取决于活性菌群。

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