Soil respiration and mass balance estimation of fine root production in Fitzroya cupressoides forests of southern Chile

生物量(生态学) 环境科学 土壤呼吸 生产力 温带气候 土壤水分 温带雨林 土壤碳 亚热带 南半球 雨林 航程(航空) 生态学 生物 生态系统 土壤科学 材料科学 复合材料 宏观经济学 经济
作者
Rocío Urrutia‐Jalabert,Yadvinder Malhi,Antonio Lara
出处
期刊:Ecosphere [Wiley]
卷期号:8 (4) 被引量:8
标识
DOI:10.1002/ecs2.1640
摘要

Abstract The soil carbon dynamics of southern hemisphere temperate rainforests have rarely been studied. Here, we report for the first time soil CO 2 effluxes and their partitioning for medium‐age and old‐growth Fitzroya cupressoides forests growing under contrasting environmental conditions in the Coastal Range and Andean Cordillera of southern Chile. Fitzroya is a high biomass and one of the longest lived species in the world. We characterized soil respiration patterns over almost 2 yr. Annual soil respiration was slightly higher in younger forests from the Coastal Range compared with Andean forests during the first studied year (6.37–6.66 vs. 5.06–6.14 Mg C·ha −1 ·yr −1 ), and significantly higher during the second year mainly due to a warmer and drier summer (8.08–8.64 vs. 4.98–5.35 Mg C·ha −1 ·yr −1 ). Therefore, warmer and drier conditions, likely to become more common in this region under future climate change, were associated with significantly higher respiration in the shallow soils of the coast, but not in the Andes. A higher proportion of autotrophic respiration was found in the Coastal Range forest probably due to a much higher fine root biomass in this site. However, fine root productivity, an important contributor of belowground carbon fluxes, was a little lower (not significantly) in the coastal site (0.81 ± 0.60 vs. 1.50 ± 0.42 Mg C·ha −1 ·yr −1 ), indicating a longer root residence time in forests from this area. Soil CO 2 effluxes from these forests and their root productivity are at the lower end of values recorded for other mature and old‐growth temperate wet forests worldwide. The intrinsic longevity and the particularly poor soils and rainy conditions where these forests grow may influence these facts. Interannual climate variability appears to be especially important for soil respiration in the Coastal Range due to the more Mediterranean climate influence and shallow, poor water retention soils in this area.
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