Fungal ingrowth on forest floor and decomposing needle litter of Chamaecyparis obtusa in relation to resource availability and moisture condition
Fungal ingrowth on forest floor and decomposing needle litter of Chamaecyparis obtusa in relation to resource availability and moisture condition
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DOI：
10.1016/s0038-0717(03)00236-0
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发表时间：
2003-11-01
影响因子：
9.7
通讯作者：
Takeda, H
中科院分区：
文献类型：
--
作者：
Osono, T;Ono, Y;Takeda, H
真菌在森林凋落物分解过程中起着重要作用，因此，需要研究凋落物分解过程中菌丝丰度的变化，并探讨凋落物中菌丝向内生长的调控因素。本研究的目的是证明针分解的模式Chamaaparis obtusa在凋落物层（L1，L2，F，和H层）和真菌的生物量和化学性质的垂直分布和真菌的向内生长和演替的有机化学和氮的动态过程中的针叶凋落物分解超过一年的时间。另一个目的是评估水分和可用性的有机物活菌丝长度的影响，在我一年的分解。活菌丝长度与综纤维素浓度在四个凋落物层。在一个垃圾袋实验中，总（活加死）菌丝长度增加分解过程中，这是相关的氮，木质素，综纤维素，可溶性碳水化合物在凋落物中的浓度。分解测量的12个月期间被分为四个季节和含水量和活菌丝长度之间的相关性进行了评估，为每个时期。活菌丝的长度在所有四个时期的凋落物含水量相关。含水量与活菌丝长度之间的回归线斜率与各时期可溶性碳水化合物的平均浓度呈正相关，表明活菌丝的生长高度依赖于凋落物的水分状况，在潮湿条件下依赖于凋落物中可溶性碳水化合物的有效性。分解过程中坡度的减小可以归因于这些时期负责分解的真菌的生理生态特征。(C)2003 Elsevier Ltd.保留所有权利。
Fungi play an important role in litter decomposition in forest ecosystems and studies are needed to follow the changes in hyphal abundance during litter decomposition and examine the factors regulating the ingrowth of hyphae in litter. The purposes of the present study are to demonstrate the patterns of needle decomposition of Chamaecyparis obtusa in terms of the vertical distribution of fungal biomass and chemical properties within litter horizons (L1, L2, F, and H layers) and fungal ingrowth and succession in relation to organic chemical and nitrogen dynamics during needle litter decomposition over a one-year period. A further aim is to assess the effect of moisture and availability of organic matter on live hyphal length, during I year of decomposition. Live hyphal length was correlated to holocellulose concentration in four litter horizons. In a litter bag experiment, total (live plus dead) hyphal length increased during decomposition which was correlated to the concentrations of nitrogen, lignin, holocellulose, and soluble carbohydrate in the litter. The 12-month period over which decomposition was measured was divided into four seasons and the correlation between the water content and live hyphal length was evaluated for each period. The length of live hyphae was correlated to the water content of litter in all four periods. The slopes of regression lines between the water content and live hyphal length were positively correlated to the mean concentrations of soluble carbohydrate of each period, suggesting that the growth of live hyphae was highly dependent on the moisture condition of litter, and under moist conditions on the availability of soluble carbohydrate in the litter. The decrease in the slopes during decomposition can be ascribed to ecophysiological traits of fungi responsible for decomposition in these periods. (C) 2003 Elsevier Ltd. All rights reserved.