Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15813 |
Drought stress mitigation by nitrogen in boreal forests inferred from stable isotopes | |
Choimaa Dulamsuren; Markus Hauck | |
2021-08-02 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | Forest growth in most parts of the boreal zone is originally limited by low temperatures and low nitrogen availability. Due to the rapid climate warming at high latitudes, an increasing forest area is switching to drought limitation, especially in continental and southern parts of the boreal forest. Studies addressing this issue were mostly dendrochronological and remote-sensing analyses focusing on climatic effects, but not answering the question whether drought is effective alone or in combination with nitrogen shortage at limiting the forests’ productivity and vitality. Here we show in a case study from larch forests of Mongolia with a combination of stable isotope analyses, tree-ring analysis and bioindication of the local variability of livestock densities using epiphytic lichens that, in the studied highly drought-prone forests at the southern fringe of the boreal forest in Inner Asia, the trees’ vulnerability to drought is modified by nitrogen fertilization from livestock kept in the vicinity and the edge of the forests. The most likely mechanism behind this drought-nitrogen interaction is the reduction of stomatal conductance, which is known to be induced by low nitrogen levels in plants. Nitrogen fertilization by the livestock could, thus, shorten the times of stomatal closure and thereby increase tree growth, which we measured as radial stem increment. Even though the underlying mechanisms, which were so far examined in angiosperms, should be experimentally tested for conifers, our results indicate that focusing on water alone is not enough to understand the climate change response of drought-limited boreal forests. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/335369 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Choimaa Dulamsuren,Markus Hauck. Drought stress mitigation by nitrogen in boreal forests inferred from stable isotopes[J]. Global Change Biology,2021. |
APA | Choimaa Dulamsuren,&Markus Hauck.(2021).Drought stress mitigation by nitrogen in boreal forests inferred from stable isotopes.Global Change Biology. |
MLA | Choimaa Dulamsuren,et al."Drought stress mitigation by nitrogen in boreal forests inferred from stable isotopes".Global Change Biology (2021). |
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