Coarse woody debris accelerates the decomposition of deadwood inputs across temperate forest
Coarse woody debris accelerates the decomposition of deadwood inputs across temperate forest
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DOI：
10.1007/s10533-023-01045-8
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发表时间：
2023-05
期刊：
影响因子：
4
通讯作者：
M. Bradford;G. F. Veen;Ellen M Bradford;K. Covey;T. Crowther;Nic Fields;Paul T. Frankson;J. González-Rivero;F. Jevon;Sara E. Kuebbing;Steven G. McBride;J. Mohan;E. E. Oldfield-E.;A. Oliverio;Alexander Polussa;Corinna Steinrueck;M. Strickland;E. Ward;Carl Wepking;D. Maynard
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作者：
M. Bradford;G. F. Veen;Ellen M Bradford;K. Covey;T. Crowther;Nic Fields;Paul T. Frankson;J. González-Rivero;F. Jevon;Sara E. Kuebbing;Steven G. McBride;J. Mohan;E. E. Oldfield-E.;A. Oliverio;Alexander Polussa;Corinna Steinrueck;M. Strickland;E. Ward;Carl Wepking;D. Maynard
木材分解受多种控制因素的调节，包括气候和木材性状，这些因素在地方和区域尺度上各不相同。然而，当这些控制措施不起作用时，分解率却有很大的不同。真菌群落动力学经常被用来解释这些差异，这表明影响真菌群落的生态系统特性的知识将提高对木材分解的理解和预测。我们假设，枯木输入分解速度更快，在森林中有较高的库存下降的粗木质材料（CWM），因为CWM是一种资源，木质纤维素分解真菌迅速殖民新的投入。为了验证这一假设，我们测量了五个物种的1，116件细木质材料（FWM）的分解，在美国东部森林的五个地点跨越10°纬度，孵育13至49个月。我们把FWM件附近和远离CWM跨观测样带和实验共同花园。土壤温度的积极影响位置水平的平均分解速率，但这些位置的差异小于位置内的分解变化。其中一些变化是由水煤浆引起的，其中水煤浆旁边的FWM碎片分解得更快。这些影响是更大的孵化时间和较低的初始木材密度的FWM。水煤浆的效果大小与已知的控制温度、枯枝密度和直径的效果大小相同。CWM的abbanding数据是许多森林，因此可能是一个生态系统变量适合列入分解模型。我们的研究结果表明，保护工作，重建枯竭的水煤浆库存在温带森林可能会加速分解新鲜的枯枝输入。
Wood decomposition is regulated by multiple controls, including climate and wood traits, that vary at local to regional scales. Yet decomposition rates differ dramatically when these controls do not. Fungal community dynamics are often invoked to explain these differences, suggesting that knowledge of ecosystem properties that influence fungal communities will improve understanding and projection of wood decomposition. We hypothesize that deadwood inputs decompose faster in forests with higher stocks of downed coarse woody material (CWM) because CWM is a resource from which lignocellulolytic fungi rapidly colonize new inputs. To test this hypothesis, we measure decomposition of 1,116 pieces of fine woody material (FWM) of five species, incubated for 13 to 49 months at five locations spanning 10°-latitude in eastern U.S. forest. We place FWM pieces near and far from CWM across observational transects and experimental common gardens. Soil temperature positively affects location-level mean decomposition rates, but these among-location differences are smaller than within-location variation in decomposition. Some of this variability is caused by CWM, where FWM pieces next to CWM decompose more rapidly. These effects are greater with time of incubation and lower initial wood density of FWM. The effect size of CWM is of the same relative magnitude as for the known controls of temperature, deadwood density and diameter. Abundance data for CWM is available for many forests and hence may be an ecosystem variable amenable for inclusion in decomposition models. Our findings suggest that conservation efforts to rebuild depleted CWM stocks in temperate forests may accelerate decomposition of fresh deadwood inputs.