期刊
BIOGEOCHEMISTRY
卷 127, 期 2-3, 页码 217-230出版社
SPRINGER
DOI: 10.1007/s10533-015-0176-2
关键词
beta-glucosidase; beta-xylanase; Q(10) values; Soil carbon; Tropical montane forest
资金
- UK Natural Environment Research Council (NERC) [NE/G018278/1, NE/F002149/1]
- ARC [FT110100457]
- European Union [FP7-2012-329360]
- Natural Environment Research Council [NE/G016720/2, NE/G016720/1, NE/G018367/2, NE/K01627X/1, NE/F002149/1, NE/G018278/1, ceh020008, NE/K016121/1] Funding Source: researchfish
- NERC [NE/K01627X/1, NE/F002149/1, NE/G018367/2, NE/G016720/2, NE/G016720/1, NE/G018278/1, ceh020008, NE/K016121/1] Funding Source: UKRI
Soil enzymes are catalysts of organic matter depolymerisation, which is of critical importance for ecosystem carbon (C) cycling. Better understanding of the sensitivity of enzymes to temperature will enable improved predictions of climate change impacts on soil C stocks. These impacts may be especially large in tropical montane forests, which contain large amounts of soil C. We determined the temperature sensitivity (Q (10)) of a range of hydrolytic and oxidative enzymes involved in organic matter cycling from soils along a 1900 m elevation gradient (a 10 A degrees C mean annual temperature gradient) of tropical montane forest in the Peruvian Andes. We investigated whether the activity (V (max)) of selected enzymes: (i) exhibited a Q (10) that varied with elevation and/or soil properties; and (ii) varied among enzymes and according to the complexity of the target substrate for C-degrading enzymes. The Q (10) of V (max) for beta-glucosidase and beta-xylanase increased with increasing elevation and declining mean annual temperature. For all other enzymes, including cellobiohydrolase, N-acetyl beta-glucosaminidase and phosphomonoesterase, the Q (10) of V (max) did not vary linearly with elevation. Hydrolytic enzymes that degrade more complex C compounds had a greater Q (10) of V (max), but this pattern did not apply to oxidative enzymes because phenol oxidase had the lowest Q (10) value of all enzymes studied here. Our findings suggest that regional differences in the temperature sensitivities of different enzyme classes may influence the terrestrial C cycle under future climate warming.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据