The geographical gradient of pine log decomposition in Japan
The geographical gradient of pine log decomposition in Japan
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DOI：
10.1016/j.foreco.2015.04.010
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发表时间：
2015-08-01
影响因子：
3.7
通讯作者：
Fukasawa, Yu
中科院分区：
文献类型：
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作者：
Fukasawa, Yu
粗木质残体（CWD）的腐烂过程对森林生态系统的生物多样性至关重要。木材腐朽类型，传统上分为白色，棕色，和软腐，是真菌腐烂活动的结果，并强烈结构的社区栖息CWD。评价森林沿着不同腐朽类型的发生规律，对大尺度上了解森林生物多样性具有重要意义。我研究了环境变量的影响，发生在30个地点，覆盖在日本的纬度梯度，包括网站的松树枯萎病（PWD）在最近几十年中损坏的松树日志中的木材腐烂类型。在木材腐烂类型中，褐腐的频率与纬度梯度呈负相关，软腐病的频率与年平均温度（MAT）呈正相关，表明木质素的积累过程中松原木分解是更突出的在温暖的低纬度地区比在凉爽的高纬度地区的日本。相反，白色腐烂与MAT呈负相关。降雨量、PWD、原木直径、土壤接触、树皮和苔藓覆盖对腐烂类型的影响也很明显。原木内不同腐烂类型的数量与纬度呈负相关，与农药呈正相关。目前的植被的影响没有检测到。(C)2015 Elsevier B.V.版权所有。
The decay process of coarse woody debris (CWD) is crucial for biodiversity in forest ecosystems. Wood decay types, traditionally categorized into white, brown, and soft rots, are the consequence of fungal decay activities and strongly structure the communities inhabiting CWD. It is important to evaluate the occurrence patterns of the decay types along a geographical range to understand forest biodiversity in wide scale. I examined the effects of environmental variables on the occurrence of wood decay types in pine logs in 30 sites covering a latitudinal gradient in Japan, including sites damaged by pine wilt disease (PWD) in recent decades. Among the wood decay types, the frequency of brown rot was negatively correlated with latitudinal gradient and that of soft rot was positively correlated with mean annual temperature (MAT), suggesting that lignin accumulation during pine log decomposition is more prominent in the warmer lower-latitude areas than in the cooler higher-latitude areas of Japan. In contrast, white rot was negatively correlated with MAT. The effects of precipitation, PWD, log diameter, soil contact, and bark and moss covers on decay type were also apparent. Number of different decay types within a log was negatively correlated with latitude and positively correlated with pesticide. The effects of current vegetation was not detected. (C) 2015 Elsevier B.V. All rights reserved.