Estimation of dispersal gradients of S- and P-type basidiospores of Heterobasidion annosum
Estimation of dispersal gradients of S- and P-type basidiospores of Heterobasidion annosum
复制标题
Heterobasidion annosum 的 S 型和 P 型担孢子扩散梯度的估计
DOI：
10.1111/j.1439-0329.1997.tb01083.x
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
A. Pappinen
中科院分区：
文献类型：
--
作者：
T. Möykkynen;K. Weissenberg;A. Pappinen
总结
1995年6月、7月和8月，在距欧洲云杉（Picea abies）S型和P型侵染中心5-1000 m处，用木圆盘法测定了欧洲云杉（Picea abies）根病原菌异担子（Heterobasidion annosum）在空气中的沉积物数量。在该地区的背景沉积的水平，确定在四个健康的控制站。根据互不育组确定的存款，只有在100米的感染中心的测量可以用于估计的扩散梯度，由于与背景沉积混淆。幂律梯度模型充分地描述了存款的减少，从感染中心的距离增加。由于采集期间风速较低（3.2m/s），感染中心周围四个方向的风速相当相似。梯度是陡峭的P型中心周围，可能是由于其较低的孢子生产能力。背景沉积水平（2.8菌落/m2× h）分别在距离S型和P型中心1255 m和98 m处达到。
Summary
The number of airborne deposits of the root pathogen Heterobasidion annosum was counted with a wood disc method at distances 5–1000 m from one S-type and one P-type infection centre in stands of Picea abies in June, July and August, 1995. The level of background deposition in the area was determined in four healthy control stands. Based on intersterility group determination of deposits, only measurements within 100 m of the infection centres could be used in estimations of dispersal gradients owing to confusion with background deposition. A power law gradient model adequately described the reduction of deposits with increasing distance from the infection centres. Gradients were fairly similar in four directions around the infection centres as the wind speeds were low (3.2m/s) during the collection periods. The gradients were steeper around the P-type centre, probably due to its lower spore production capacity. The background deposition level (2.8 colonies/m2× h) was reached at distances 1255 m and 98 m from the S-type and P-type centre, respectively.