Ash Dieback on Sample Points of the National Forest Inventory in South-Western Germany

被引:16
|
作者
Enderle, Rasmus [1 ,2 ]
Metzler, Berthold [2 ]
Riemer, Uli [3 ]
Kaendler, Gerald [3 ]
机构
[1] Julius Kuehn Inst, Inst Plant Protect Hort & Forests, Fed Res Ctr Cultivated Plants, Messeweg 11-12, D-38104 Braunschweig, Germany
[2] Forest Res Inst Baden Wurttemberg, Dept Forest Hlth, Wonnhaldestr 4, D-79100 Freiburg, Germany
[3] Forest Res Inst Baden Wurttemberg, Biometr & Informat, Wonnhaldestr 4, D-79100 Freiburg, Germany
来源
FORESTS | 2018年 / 9卷 / 01期
关键词
Fraxinus excelsior; ash dieback; Hymenoscyphus fraxineus; national forest inventory; disease progression; invasive pathogen; crown defoliation; collar necrosis; regeneration; FRAXINUS-EXCELSIOR; HYMENOSCYPHUS-PSEUDOALBIDUS; TEMPORAL DEVELOPMENT; GENETIC-VARIATION; COLLAR ROTS; STRATEGIES; MANAGEMENT; RESISTANCE; IMPACTS; AGENT;
D O I
10.3390/f9010025
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
The alien invasive pathogen Hymenoscyphus fraxineus causes large-scale decline of European ash (Fraxinus excelsior). We assessed ash dieback in Germany and identified factors that were associated with this disease. Our assessment was based on a 2015 sampling of national forest inventory plots that represent a supra-regional area. In the time from 2012 to 2015, the number of regrown ash trees corresponded to only 42% of the number of trees that had been harvested or died. Severe defoliation was recorded for almost 40% of the living trees in 2015, and more than half of the crowns mainly consisted of epicormic shoots. Necroses were present in 24% of root collars. A total of 14% of the trees were in sound condition, which sum up to only 7% of the timber volume. On average, trees of a higher social status or with a larger diameter at breast height were healthier. Collar necroses were less prevalent at sites with a higher inclination of terrain, but there was no evidence for an influence of climatic variables on collar necroses. The disease was less severe at sites with smaller proportions of the basal area of ash compared to the total basal area of all trees and in the north-eastern part of the area of investigation. The regeneration of ash decreased drastically.
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页数:13
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