• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geoderma: An International Journal of Soil Science >Environmental factors controlling soil organic carbon storage in loess soils of a subhumid region, northern Iran
【24h】

Environmental factors controlling soil organic carbon storage in loess soils of a subhumid region, northern Iran

机译：伊朗北部半湿润地区黄土土壤中控制土壤有机碳储存的环境因素

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

Soil organic carbon (SOC) storage is a basic measure used to study soil productivity, hydrology and the balance among greenhouse gases. Variation of SOC is controlled by environmental factors such as land use and topography. Toshan watershed located in northern Iran was selected to study the effects of different land uses i.e. forest (FO), cropland (CP), orchard (OR) and abandoned land (AB) on different slope gradients and aspects on SOC both in surface (0-30 cm) and subsurface (30-100 cm) layers. A total of 364 soil samples plus 1638 undisturbed ones were collected from two soil layers in 182 sampling sites. Results showed that the surface 30 cm soil layer was solely responsible for 54.8% of SOC density. On average, FO with 22.84 kg m(-2) had the highest SOC density in 0-100 cm layer. Deforestation and agricultural activities have resulted in a significant 48.2% decrease of SOC density in 0-30 cm soil layer. North facing slope (N) aspect and also flat area of all land uses had the higher SOC density compared to east (E) and west facing slope (W) aspects in this subhumid region in 0-100 cm layer. Generally, in the upper 100 cm soil layer of deforested lands, gentle and moderate slopes had higher SOC density than steeper slopes. There was a positive significant correlation between SOC density and clay content. The largest amount of SOC storage was observed in the surface 30 cm layer accounting for 74,907.94 Mg (54.4% of total SOC storage), indicating the important key role of topsoil in conserving SOC. FO with one-third proportion of the total area stored the largest amount of SOC (39,325.55 Mg; 52.5%) in surface layer. In conclusion, protection of forest lands is higher important to increase SOC storage. Agricultural activities on steep E and W aspects in deforested lands must be reduced or prohibited. The subsoil has almost the same contribution to SOC storage and therefore should be carefully considered for management measures. Generally, interaction between environmental factors on storing SOC and also rate of carbon loss to the atmosphere was significant. (C) 2016 Elsevier B.V. All rights reserved.
机译：土壤有机碳（SOC）存储是用于研究土壤生产力，水文学和温室气体之间平衡的一项基本措施。 SOC的变化受环境因素（例如土地使用和地形）的控制。选择位于伊朗北部的Toshan分水岭来研究不同土地利用的影响，即森林（FO），农田（CP），果园（OR）和废弃土地（AB）对不同坡度的坡度和表面上SOC的影响（0 -30厘米）和地下（30-100厘米）层。从182个采样点的两个土壤层中总共采集了364个土壤样本和1638个未扰动的土壤样本。结果表明，30 cm的土壤表层仅占SOC密度的54.8％。平均而言，FO为22.84 kg m（-2）在0-100 cm层中具有最高的SOC密度。砍伐森林和农业活动导致0-30厘米土壤层的SOC密度显着下降48.2％。在此半湿润区域（0-100厘米）中，北坡（N）和所有土地利用的平坦区域均比东坡（E）和西坡（W）高。通常，在森林砍伐土地的上层100 cm土层中，平缓和中等坡度的SOC密度高于陡坡。 SOC密度与粘土含量之间存在显着的正相关。在30 cm的表层中观察到最大的SOC储量，占74,907.94 Mg（占总SOC储量的54.4％），表明表土在保护SOC中起着重要的关键作用。占总面积三分之一的FO在表层中存储了最大量的SOC（39,325.55 Mg; 52.5％）。总之，保护林地对于增加SOC的存储至关重要。必须减少或禁止在被砍伐的土地上在陡峭的东侧和西侧的农业活动。地下土壤对SOC的贡献几乎相同，因此应谨慎考虑采取管理措施。通常，存储SOC的环境因素与碳向大气中的碳损失率之间的相互作用非常重要。 （C）2016 Elsevier B.V.保留所有权利。

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