ABSTRACT

Stump removal is considered as the most effective method to reduce losses caused by root rot fungi, including Heterobasidion root rot. To evaluate the persistence of Heterobasidion spp. in root fragments left on site after stump removal, and to analyse the ecological impact of stump removal, five permanent sample plots were established in Latvia and samples were taken immediately after stump removal and 6 years later. In total, 1008 roots of 200 Picea abies stumps were measured and sampled immediately after stump removal. In total, Heterobasidion was detected in 0.7% of healthy looking roots, 2.0% of discoloured roots and 21.4% of decayed roots. Six years later, a total of 203 root fragments were collected in stump removal areas, and Heterobasidion was isolated from 1.5% of the collected root pieces. Fungal diversity was higher in root fragments collected in sample plots 6 years after stump removal compared with fungal diversity in roots immediately after stump extraction, and the species were significantly different. In conclusion, stump removal could be used in areas heavily infected by root rot fungi, and this method will likely not have a negative effect on the total amount of saproxylic fungi.

摘要

去除树桩被认为是减少根腐病真菌（包括异源异位根腐病）引起的损失的最有效方法。评估异戊二烯属菌种的持久性。在去除树桩后留在原地的根部碎片中，并分析树桩去除的生态影响，在拉脱维亚建立了五个永久性采样区，并在去除树桩后立即和6年后取样。总共，在去除树桩后立即对200个云杉树桩的1008个根进行了测量和采样。总体上，在看上去健康的根中有0.7％检出异源，在变色的根中检出了2.0％，在腐烂的根中检出了21.4％。六年后，在树桩去除区域总共收集了203个根碎片，从1.5％收集的根块中分离出异源异烟肼。与去除树桩后立即提取的根系中的真菌多样性相比，去除树桩后6年在样地中收集的根碎片中的真菌多样性更高。总之，可以在根部腐烂真菌严重感染的地区使用树桩清除方法，这种方法可能不会对腐胺真菌的总量产生负面影响。