Can land management alter ecoclimate teleconnections across North America in the face of forest die-off?

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题名:	Can land management alter ecoclimate teleconnections across North America in the face of forest die-off?
作者:	Feng, X;Swann, A;Breshears, D;Lague, M;Field, J;Law, D;Lien, A;Huang, TK;Derbridge, J;Baldwin, E;Soto, J
日期:	2019-12-09
上传时间:	2022-02-15 12:16:47 (UTC+8)
摘要:	Humans are facing challenges from rapid global changes. One prominent issue is regional-scale forest die-off that has occurred on all forested continents and is projected to increase in frequency and extent. Forest die-off can affect local climate, as well as climate in remote regions through atmospheric circulation; the phenomena is called ecoclimate teleconnections. Such teleconnections induced by forest die-off raise the issue of whether, and by how much, can the local and remote impacts be altered by post-die-off land management. We conducted experiments that mimic two land management scenarios after forest die-off: a more extreme scenario that forested area is replaced with grassland, and a less extreme scenario that forested area is replaced with shrubland. We implemented these vegetation changes in the Community Earth System Model (CESM), using regions from the National Ecological Observatory (NEON) as study units. We first simulated forest die-off in one NEON region (sending region), then assessed changes of key climate variables (temperature, precipitation) and ecological conditions (GPP) in other NEON regions (receiving region). The two scenarios of forest conversion generally both led to lower annual temperature for the whole U.S., but the changes in precipitation and GPP varied and depended on where forest conversion occured. The strength and sign of the teleconnections also varied by sending region, receiving region, and the post die-off land type (grassland vs. shrubland). The two forest conversion scenarios led to different structure and strength of teleconnections, and the forest to grass conversion was associated with more negative teleconnections in terms of temperature, precipitation, and GPP. Our study revealed different ecoclimate teleconnections associated with forest conversion scenarios, which suggest that post die-off land management strategies can alter ecoclimate teleconnections. These results are the first to suggest such a land management link.
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