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首页> 外文期刊>Soil Biology & Biochemistry >Fungal growth on a common wood substrate across a tropical elevation gradient: Temperature sensitivity, community composition, and potential for above-ground decomposition
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Fungal growth on a common wood substrate across a tropical elevation gradient: Temperature sensitivity, community composition, and potential for above-ground decomposition

机译：在热带海拔梯度上，普通木材上的真菌生长：温度敏感性，群落组成和地上分解的潜力

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摘要

Fungal breakdown of plant material rich in lignin and cellulose (i.e. lignocellulose) is of central importance to terrestrial carbon (C) cycling due to the abundance of lignocellulose above and below-ground. Fungal growth on lignocellulose is particularly influential in tropical forests, as woody debris and plant litter contain between 50% and 75% lignocellulose by weight, and can account for 20% of the C stored in these ecosystems. In this study, we evaluated factors affecting fungal growth on a common wood substrate along a wet tropical elevation gradient in the Peruvian Andes. We had three objectives: 1) to determine the temperature sensitivity of fungal growth - i.e. Q sub(10), the factor by which fungal biomass increases given a 10 degree C temperature increase; 2) to assess the potential for above-ground fungal colonization and growth on lignocellulose in a wet tropical forest; and 3) to characterize the community composition of fungal wood decomposers across the elevation gradient. We found that fungal growth had a Q sub(10) of 3.93 (95% CI of 2.76-5.61), indicating that fungal biomass accumulation on the wood substrate nearly quadrupled with a 10 degree C increase in temperature. The Q sub(10) for fungal growth on wood at our site is higher than Q sub(10) values reported for litter decomposition in other tropical forests. Moreover, we found that above-ground fungal growth on the wood substrate ranged between 37% and 50% of that measured in the soil, suggesting above-ground breakdown of lignocellulose represents an unexplored component of the C cycle in wet tropical forests. Fungal community composition also changed significantly along the elevation gradient, and Ascomycota were the dominant wood decomposers at all elevations. Fungal richness did not change significantly with elevation, directly contrasting with diversity patterns observed for plant and animal taxa across this gradient. Significant variation in fungal community composition across the gradient suggests that the characteristics of fungal decomposer communities are, directly or indirectly, influenced by temperature.
机译：富含木质素和纤维素（即木质纤维素）的植物材料的真菌分解对地面碳（C）循环至关重要，因为木质纤维素在地上和地下的含量很高。木质纤维素上的真菌生长在热带森林中尤为重要，因为木屑和植物垃圾中木质纤维素的重量占50％至75％，可占这些生态系统中所储存碳的20％。在这项研究中，我们评估了影响秘鲁安第斯山脉湿热带海拔梯度上普通木材基质上真菌生长的因素。我们有三个目标：1）确定真菌生长的温度敏感性-即Q sub（10），即温度升高10摄氏度时真菌生物量增加的因子; 2）在潮湿的热带森林中评估木霉纤维素在地上真菌定植和生长的潜力; 3）表征海拔梯度上真菌木分解剂的群落组成。我们发现真菌生长的Q sub（10）为3.93（95％CI为2.76-5.61），表明真菌生物量在木材基质上的积累几乎随温度升高10摄氏度增加了三倍。我们站点上木材上真菌生长的Q sub（10）高于其他热带森林中凋落物分解的Q sub（10）值。此外，我们发现木材基质上的地上真菌生长范围是土壤中测得的37％至50％，这表明木质纤维素的地上分解代表了湿热带森林中C循环的未开发成分。真菌群落组成也随海拔梯度发生显着变化，而子囊菌是所有海拔下主要的木材分解者。真菌的丰富度并没有随着海拔的升高而发生显着变化，这与在该梯度范围内观察到的动植物分类群的多样性模式直接相反。整个梯度范围内真菌群落组成的显着变化表明，真菌分解者群落的特征直接或间接受温度影响。

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