当前位置:网站首页>Nature communications | quantitative assessment of forest death caused by drought

Nature communications | quantitative assessment of forest death caused by drought

2020-12-08 00:13:25 bugsuse

Reading guide


More and more studies show that , The drought has killed a lot of trees around the world , It has a great impact on the function and service value of forest ecosystem . Although drought can affect the photosynthesis of vegetation , And through carbon starvation and water depletion, trees die directly , But more often, the combination of drought and secondary disasters leads to massive tree deaths . such as , High temperature and drought are the inducing factors of diseases and insect pests , And may further increase the risk of forest fires . In the context of climate change , Droughts will become more frequent and severe , People are beginning to worry about whether drought will lead to more and more forest ecosystem collapse . At present, the research on forest death caused by drought is mostly focused on the stage of qualitative assessment , Quantitative assessment is still lacking , therefore , Using high-resolution remote sensing data, the authors quantitatively assessed the area of forest death caused by drought in Europe .


Original information



Text


chart 1.  The probability of forest death in Europe under different water balance conditions


First, the author analyzes the probability of forest death in Europe under different water balance conditions , water balance ( climatic water balance,CWB) It's the difference between the total monthly precipitation and the potential evapotranspiration . It turns out that , There is a threshold relationship between water balance and forest mortality , When CWB Below the climate average -1.6 When the standard deviation is one , Forest mortality has increased dramatically ; lower than -3.0 When the standard deviation is one , The probability of forest death is 91.6%(83.8-97.5%).


chart 2. 1987~2016 The main area of forest death in Europe


The author further analyzes 1987~2016 The main area of forest death in Europe . The results showed that the forest death caused by drought mainly distributed in :1992 Central Europe 、1994 Spain 、1999 Years and 2002 The Baltic States 、2000 Southeast Europe 、2003 Central and Western Europe 、2005 The Iberian Peninsula 、2006 Central Europe and Finland 、2007 Years and 2012 Southeast Europe and Eastern Europe .


chart 3. 1987~2016 The interannual change of forest death area in Europe


1987~2016 year , The area of forest death caused by drought in Europe has reached 511,059 ha , The area of forest death showed a pulse distribution , The most serious five years are :2005 year (127,688  ha ),2003 year (103,311 ha ),2006 year (48,306 ha ),2000 year (34,026 ha ),1994 year (33,075 ha ).


Finally, the author points out that , This paper provides important evidence that drought causes extensive tree death , It is suggested that the increase of drought in the future may further cause the death of trees in Europe .


Related reading :

GRL | A selection of drought related studies


Click on the paper link below Read the original

This article is from WeChat official account. - Weather grocery store (meteogs).
If there is any infringement , Please contact the support@oschina.cn Delete .
Participation of this paper “OSC Source creation plan ”, You are welcome to join us , share .

版权声明
本文为[bugsuse]所创,转载请带上原文链接,感谢
https://chowdera.com/2020/12/20201208001316085i.html