Carbon dioxide and methane fluxes in grazed and undisturbed mountain peatlands in the Ecuadorian Andes
Carbon dioxide and methane fluxes in grazed and undisturbed mountain peatlands in the Ecuadorian Andes
复制标题
厄瓜多尔安第斯山脉放牧和未受干扰的山地泥炭地的二氧化碳和甲烷通量
DOI：
10.19189/map.2017.omb.277
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发表时间：
2017
期刊：
影响因子：
1.2
通讯作者：
E. Suárez
中科院分区：
文献类型：
--
作者：
M. Sánchez;R. Chimner;J. Hribljan;E. Lilleskov;E. Suárez
泥炭地广泛分布在热带的安第斯帕拉莫地区。尽管这些生态系统中有大量的碳储量，但二氧化碳(CO2)和甲烷(CH4)的通量数据仍然匮乏。此外，放牧牛在帕莫地区很普遍，可能会改变气体通量。因此，我们的目标是用静态室技术在厄瓜多尔山区未受干扰和集约化放牧的泥炭地测量CO2和CH4通量。我们发现，与草坪相比，未受干扰地的丘陵地具有更高的净生态系统交换(NEE)、总初级生产力(GPP)、生态系统呼吸(ER)和CH4通量。相反，放牧地的微地形不能预测二氧化碳通量，而植被覆盖与所有三个指标(NEE、ER和GPP)都相关。在低植被覆盖度下，NEE为正(碳损失)。未干扰区甲烷排放量较低(8.1 mg CH4m-2d-1)。相比之下，放牧地的甲烷排放量要大得多(132.3 mg甲烷m-2d-1)。这可能归因于牛的践踏和营养输入。总而言之，这两个泥炭地的二氧化碳和甲烷交换率差异很大，这可能是由于气候和水文的差异，也可能是由于牛的密集放牧。
Peatlands are widespread throughout the tropical Andean paramo. Despite the large carbon stocks in these ecosystems, carbon dioxide (CO2) and methane (CH4) flux data are lacking. In addition, cattle grazing is widespread in the paramo and could alter gas fluxes. Therefore, our objectives were to measure CO2 and CH4 fluxes with the static chamber technique in an undisturbed and in an intensively cattle grazed peatland in the mountains of Ecuador. We found that hummocks in the undisturbed site had higher net ecosystem exchange (NEE), gross primary production (GPP), ecosystem respiration (ER), and CH4 fluxes, compared to lawns. In contrast, microtopography at the grazed site did not predict CO2 fluxes, whereas vegetation cover was correlated for all three metrics (NEE, ER, and GPP). At low vegetation cover, NEE was positive (losing carbon). CH4 emissions in the undisturbed site were low (8.1 mg CH4 m-2 d-1). In contrast, CH4 emissions at the grazed site were much greater (132.3 mg CH4 m-2 d-1). This is probably attributable to trampling and nutrient inputs from cattle. In summary, the two peatlands differed greatly in CO2 and CH4 exchange rates, which could be due to the variation in climate and hydrology, or alternatively to intensive grazing by cattle.
影响因子：
11.6
作者：
M. Turetsky;A. Kotowska;J. Bubier;N. Dise;P. Crill;E. Hornibrook;K. Minkkinen;T. Moore;I. Myers-Smith
通讯作者：
M. Turetsky;A. Kotowska;J. Bubier;N. Dise;P. Crill;E. Hornibrook;K. Minkkinen;T. Moore;I. Myers-Smith
影响因子：
4.9
作者：
Y. Teh;T. Diem;S. Jones;L. P. H. Quispe;E. Baggs;N. Morley;M. Richards;Pete Smith;P. Meir
通讯作者：
Y. Teh;T. Diem;S. Jones;L. P. H. Quispe;E. Baggs;N. Morley;M. Richards;Pete Smith;P. Meir