Changes in microclimate and hydrology in an unmanaged mountain forest catchment after insect-induced tree dieback

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作者：
Kopáček, Jiří [1 ,2 ]
Bače, Radek [3 ]
Hejzlar, Josef [1 ]
Kaňa, Jiří [1 ,2 ]
Kučera, Tomáš [2 ]
Matějka, Karel [4 ]
Porcal, Petr [1 ,2 ]
Turek, Jan [1 ]
机构：
[1] Biology Centre of the Czech Academy of Sciences, Institute of Hydrobiology, České Budějovice, Czech Republic
[2] University of South Bohemia, Faculty of Science, České Budějovice, Czech Republic
[3] Czech University of Life Sciences, Faculty of Forestry and Wood Science, Prague, Czech Republic
[4] IDS, Prague, Czech Republic
来源：
Science of the Total Environment | 2020年 / 720卷
关键词：
Hydrological and microclimatic changes after insect-induced tree dieback were evaluated in an unmanaged central European mountain (Plešné; PL) forest and compared to climate-related changes in a similar; but almost intact (Čertovo; CT) control forest during two decades. From 2004 to 2008; 93% of Norway spruce trees were killed by a bark beetle outbreak; and the entire PL area was left to subsequent natural development. We observed that (1) climate-related increases in daily mean air temperature (2 m above ground) were 1.6 and 0.5 °C on an annual and growing season basis; respectively; and an increase in daily mean soil temperature (5 cm below ground) was 0.9 °C during growing seasons at the CT control from 2004 to 2017; (2) daily mean soil and air temperatures increased by 0.7–1.2 °C on average more at the disturbed PL plots than in the healthy forest; (3) water input to soils increased by 20% but decreased by 17% at elevations of 1122 and 1334 m; due to decreased occult deposition to; and evaporation from; canopies after tree dieback; (4) soil moisture was 5% higher on average (but up to 17% higher in dry summer months) in the upper PL soil horizons for 5–6 years following the tree dieback; (5) run-off from the PL forest ~6% (~70 mm yr−1) increased relatively to the CT forest (but without extreme peak flows and erosion events) after tree dieback due to the ceased transpiration of dead trees and elevated water input to soils; and (6) relative air humidity was 4% lower on average at disturbed plots than beneath living trees. The rapid tree regeneration during the decade following tree dieback resulted in a complete recovery in soil moisture; a slow recovery of discharge and air humidity; but a still insignificant recovery in air and soil temperatures. © 2020 Elsevier B.V;
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