Land cover impacts on aboveground and soil carbon stocks in Malagasy rainforest
Land cover impacts on aboveground and soil carbon stocks in Malagasy rainforest
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DOI：
10.1016/j.agee.2016.08.030
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发表时间：
2016-10-03
影响因子：
6.6
通讯作者：
Razafimbelo, Tantely
中科院分区：
文献类型：
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作者：
Andriamananjara, Andry;Hewson, Jennifer;Razafimbelo, Tantely
砍伐森林和森林退化会影响碳动态，进而影响生态系统功能和气候变化。在这项研究中，我们调查了这种土地覆盖变化对120个研究点的4种土地覆盖/利用的影响，包括封闭式郁闭林、树木休耕、灌木休耕和退化土地。我们评估了总碳库的变化，包括地上生物量(AGB)和土壤有机碳(SOC)，包括0-30厘米的表层土壤和30-100厘米的深层土壤。这四个土地覆盖/用途位于马达加斯加东部潮湿的热带森林的四个地区(安达西贝、迪迪、安贾哈马纳和拉卡托)。结果表明，AGB和土壤的总碳库平均为166+/-57mgC ha(-1)，其中82%储存在0-100 cm的土壤表层(55%储存在表层，27%储存在深层)，这表明土壤碳库在固定大气碳中的重要性。封闭式林冠的总碳储量显著高于其他土地覆盖。在低海拔地区，总碳储量在143.5 mg C ha(-1)~163.7 mg C ha(-1)之间，而在高海拔地区，总碳储量在170.6 mg C ha(-1)~186.1 mg C ha(-1)之间。在这些研究地点，AGB和SOC的相对重要性相反，Anjahamana的AGB/SOC比率为0.37，Lakato为0.17，Didy为0.21，Andasibe为0.17。气候因素与土壤性质相结合可以解释研究区土壤有机碳的变化。土壤有机碳含量高与降雨量少、粘粒含量高、根系发育快有关。这些结果提供了对热带地区碳储量分布的准确评估，支持了森林养护和有效的土地复盖管理在维持生态系统碳储量方面的重要性，作为减缓热带森林气候变化的工具。(C)2016爱思唯尔B.V.保留所有权利。
Deforestation and forest degradation can impact carbon dynamics and, subsequently, ecosystem functioning and climate change. In this study, we surveyed the influence of such land cover changes on four land cover/uses including closed canopy forest, tree fallow, shrub fallow, and degraded land among 120 study sites. We assessed these changes on total carbon stocks including both aboveground biomass (AGB) and soil organic carbon (SOC) including both topsoil, 0-30 cm, and deep soil, 30-100 cm. The four land cover/uses were located within four regions (Andasibe, Didy, Anjahamana, and Lakato) in the Eastern humid tropical forest of Madagascar. Our results show that total carbon stocks, AGB and soil, average 166 +/- 57 Mg C ha(-1) in which 82% is stored in 0-100 cm of soil surface horizon (55% stored in the topsoil and 27% in deep soil) suggesting the importance of soil pools in the sequestration of atmospheric carbon. The total carbon stocks were significantly higher in closed canopy compared to the other land covers. In lower altitude regions, the total carbon stock was lower ranging from 143.5 Mg C ha(-1) to 163.7 Mg C ha(-1), relative to higher altitude areas where total C stock ranged from 170.6 Mg C ha(-1) to 186.1 Mg C ha(-1). The relative importance of AGB and SOC were reversed in these study sites, with AGB/ SOC ratios of 0.37 for Anjahamana, 0.17 for Lakato, 0.21 for Didy, and 0.17 for Andasibe. Climatic factor combined with soil properties could explain the SOC variations across the study regions. High SOC was related to lower precipitation, high clay content and high root development. These results provide an accurate assessment of carbon storage distribution in a tropical region and support the importance of forest conservation and effective land cover management in maintaining carbon storage in ecosystems as tools in climate change mitigation in tropical forests. (C) 2016 Elsevier B.V. All rights reserved.