• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Global change biology >Effects of nutrition and soil warming on stemwood production in a boreal Norway spruce stand
【24h】

Effects of nutrition and soil warming on stemwood production in a boreal Norway spruce stand

机译：营养和土壤变暖对挪威北方云杉林阔叶材生产的影响

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 boreal forest is expected to experience the greatest warming of all forest biomes. The extent of the boreal forest, the large amount of carbon contained in the soil, and the expected climate warming, make the boreal forest a key biome to understand and represent correctly in global carbon models. It has been suggested that an increase in temperature could stimulate the release of CO2 caused by an increased decomposition rate, more than biomass production, which could convert current carbon sinks into carbon sources. Most boreal forests are currently carbon sinks, but it is unclear for how long in the future the carbon sink capacity of the boreal forest is likely to be maintained. The impact of soil warming on stem volume growth was studied during 6 years, in irrigated (1) and irrigated-fertilized (IL) stands of 40-year-old Norway spruce in Northern Sweden. From May to October heating cables were used to maintain the soil temperature on heated-irrigated plots (Ih and ILh) 5degreesC above that on unheated control plots (Ic and ILc). After six seasons' warming, stem volume production (m(3) ha(-1) a(-1)) was 115% higher on Ih than on unheated (Ic) plots, and on heated and irrigated-fertilized plots (ILh) it was 57% higher than on unheated plots (ILc). The results indicate that in a future warmer climate, an increased availability of nitrogen, combined with a longer growing season, may increase biomass production substantially, on both low- and high-fertility sites. It is, however, too early to decide whether the observed responses are transitory or long lasting. It is therefore crucial to gain a better understanding of the responses of boreal forest ecosystems to climate change, and to provide data to test and validate models used in predicting the impact of climate change. [References: 47]
机译：预计北方森林将经历所有森林生物群落中最大的变暖。北方森林的范围，土壤中所含的大量碳以及预期的气候变暖，使北方森林成为理解和正确表示全球碳模型的关键生物群落。有人提出，温度升高可能会比分解速率提高而刺激二氧化碳的释放，而分解速率要高于生物质的产生，这可能会将当前的碳汇转化为碳源。目前，大多数北方森林都是碳汇，但是目前还不清楚北方森林的碳汇能力可能维持多久。在瑞典北部的40年历史的挪威云杉的灌溉（1）和灌溉施肥（IL）林分中，研究了土壤变暖对茎体积生长的影响，历时6年。从5月到10月，使用加热电缆将加热灌溉地块（Ih和ILh）的土壤温度保持在未加热对照地块（Ic和ILc）的5℃。经过六个季节的变暖，Ih的茎量产量（m（3）ha（-1）a（-1））比未加热（Ic）的田地，加热和灌溉施肥的田地（ILh）高115％。比未加热的地块（ILc）高57％。结果表明，在未来变暖的气候下，低肥力和高肥力地点的氮素利用率增加，加上生长季节更长，可能会显着提高生物量产量。然而，现在判断观察到的反应是暂时的还是持久的还为时过早。因此，至关重要的是要更好地了解北方森林生态系统对气候变化的响应，并提供数据以测试和验证用于预测气候变化影响的模型。 [参考：47]

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