• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Biogeochemistry >Modelling nitrogen mineralization and plant nitrogen uptake as affected by reclamation cover depth in reclaimed upland forestlands of Northern Alberta
【24h】

Modelling nitrogen mineralization and plant nitrogen uptake as affected by reclamation cover depth in reclaimed upland forestlands of Northern Alberta

机译：亚伯塔省北方陆地林地回收覆盖深度影响的氮矿化与植物氮气吸收

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

Early forest re-establishment in landforms constructed from materials such as overburden or mine waste is partly determined by nitrogen (N) availability in reclamation covers. Here we examined whether the ecosystem model ecosys which simulates key processes governing N availability such as mineralization, plant N uptake and N return to soil through litterfall could be used to forecast potential N limitations for forest re-establishment in these constructed landforms. In this study, N cycling was simulated and tested against measured soil, foliar and surface litter N concentrations with three soil covers differing in thickness (35, 50, and 100 cm) in a 17-year-old forest reclamation site and in an analogue natural forested site in northern Alberta. Overall, results from this study demonstrated the applicability of the ecosys model in predicting nutrient cycling in reclaimed upland forestlands. Results of this study highlight the importance of optimum cover depth to ensure sufficient N is available for plant growth. Even though the modelled net N mineralization, N uptake and thereby plant productivity increased with cover depth, the foliar and surface litter N concentrations did not. A non-linear relationship between total soil nitrogen (TN) stocks and modelled net N mineralization indicated that cover depth, which determines TN stock, had little effect on net primary productivity beyond a threshold TN. This threshold was 17 Mg N ha(,)(-1) similar to TN for the 100 cm cover, giving a net N mineralization rate of 3.5 g N m(-2) year(-1), and this was attributed to reduced microbial activity in deeper soil layers.
机译：早期森林在由覆盖层或矿井废物等材料构成的地形中重新建立部分通过氮气（N）在填海盖中的可用性方面是部分确定的。在这里，我们检查了模拟管理N可用性的关键过程的生态系统模型ECOSY，如矿床，植物N摄取和N通过落穴返回土壤，可用于预测森林重建在这些构造的地貌中的潜在的n限制。在该研究中，模拟并测试了测量的土壤，叶面和表面凋落物N浓度，其中具有三个土壤覆盖物，厚度（35,50和100厘米），在17岁的森林填海部位和类似物中艾伯塔北部的天然森林植物地。总体而言，本研究的结果表明了ECOSYS模型在再生陆地林地预测营养循环中的适用性。该研究的结果突出了最佳覆盖深度的重要性，以确保足够的N可用于植物生长。尽管模拟的净矿化，N采光，由此植物生产率随覆盖深度而增加，叶面和表面凋落物N浓度没有。总土壤氮气（TN）股和模型净矿化之间的非线性关系表明，确定TN库存的覆盖深度对阈值TN的净初级生产率几乎没有影响。该阈值为17mg n ha（，）（ - 1），类似于100 cm覆盖的tn，给出3.5g n m（-2）年（-1）的净矿化率，这归因于减少深层土层中的微生物活性。

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