Regional carbon stocks and dynamics in native woody shrub communities of Senegal's Peanut Basin
Regional carbon stocks and dynamics in native woody shrub communities of Senegal's Peanut Basin
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DOI：
10.1016/j.agee.2008.04.013
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发表时间：
2008-10-01
影响因子：
6.6
通讯作者：
Noller, J. S.
中科院分区：
文献类型：
--
作者：
Lufafa, A.;Bolte, J.;Noller, J. S.
从可持续景观管理和全球变化反馈的角度来看，估计区域碳(C)储量并了解其动态是至关重要的。本研究结合遥感技术和地理信息系统世纪耦合模型，对塞内加尔花生盆地千年生灌丛群落的区域生物量碳储量和土壤有机碳动态进行了估算。建立了一个在训练区实地测量的灌木地上生物量C与卫星图像获取的灌木丰度之间的统计模型，并用于估计盆地大部分地区的区域生物量C。将CENTURY模型与地理信息系统数据库相结合，模拟了区域SOC动态变化。训练样地地上生物量C与卫星影像获取的灌木丰度呈显著正相关(r=0.73；p=0.05)。在3060公里(2)的研究区域内，地上生物量碳储量从0.01到0.45 mg ha(-1)，大约总计247,000 mg C。CENTURY模型的预测表明，这些系统中的碳固存取决于灌木残留物非热管理的长期有效性，而实际的固碳率强烈依赖于土壤类型和未来土地管理的情景。与传统的“修剪-焚烧”管理方式相比，根据土壤类型和气候条件不同的土壤类型和气候条件，修剪50年可使土壤碳汇增加200-350%，在低施肥量(35 kg ha(-1)N yr(-1)；20 kg ha(-1)P yr(-1))条件下增加270%-483%。这些结果表明，土地管理的改变可能有助于将这些退化的半干旱农业生态系统从大气二氧化碳的源转变为汇。(C)2008爱思唯尔B.V.保留所有权利。
Estimating regional carbon (C) stocks and understanding their dynamics is crucial, both from the perspective of sustainable landscape management and global change feedback. This study combines remote sensing techniques and a coupled GIS-CENTURY model to estimate regional biomass C stocks and SOC dynamics for Guiera senegalensis shrub communities in Senegal's Peanut Basin. A statistical model relating field-measured shrub aboveground biomass C at training plots to satellite image-derived shrub abundances was developed and used to estimate regional biomass C across a major part of the Basin. Regional SOC dynamics were modeled by coupling the CENTURY model and GIS databases. Significant correlation (r = 0.73; p = 0.05) was observed between aboveground biomass C and satellite image-derived shrub abundance at the training plots. Aboveground biomass C stocks ranged from 0.01 to 0.45 Mg ha(-1) with an approximate total of 247,000 Mg C for the 3060 km(2) study area. CENTURY model predictions indicate that C sequestration in these systems is contingent on long-term effectiveness of non-thermal management of shrub residue and that the actual rates depend strongly on soil type and scenarios of future land management. Compared with the traditional "pruning-burned" management practice, returning prunings for 50 years would increase soil C sequestration by 200-350% without fertilization, and increase soil C sequestration by 270-483% under a low (35 kg ha(-1) N yr(-1); 20 kg ha(-1) P yr(-1)) fertilization regime, depending on soil type and climate conditions. These results indicate that altered land management could contribute to transforming these degraded semiarid agroecosystems from a source to a sink for atmospheric CO2. (c) 2008 Elsevier B.V. All rights reserved.