Simulation of Soil Carbon Dynamics under Sugarcane with the CENTURY Model
Simulation of Soil Carbon Dynamics under Sugarcane with the CENTURY Model
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DOI：
10.2136/sssaj2007.0285
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发表时间：
2009-05-01
影响因子：
2.9
通讯作者：
Van Antwerpen, R.
中科院分区：
文献类型：
--
作者：
Galdos, M. V.;Cerri, C. C.;Van Antwerpen, R.
目前，由于经济、环境和地缘政治问题，世界对生物燃料的需求增加，甘蔗种植面积有扩大的趋势。虽然传统上甘蔗是通过燃烧干燥的叶子和顶部来收获的，但不燃烧的机械化收获已经逐渐被采用。基于过程的模型的使用有助于理解植物凋落物在土壤碳动态中的作用。本研究的目的是利用CENTORY模型评价甘蔗残渣管理对土壤C的时间动态影响，采用的方法是对甘蔗作物CENTER模型进行参数化，模拟土壤C的时间动态，并通过田间试验数据对模型进行验证，最后对土壤C进行长期预测。本工作的重点是比较焚烧和未焚烧凋落物管理系统的土壤碳储量，并对无机肥和有机残渣的应用效果进行评价。这些模拟使用了不同持续时间的实验数据，从1年到60年，地点都在巴西的伯南布哥的戈亚纳和廷鲍巴，圣保罗的普拉多利斯，以及南非夸祖鲁-纳塔尔的埃奇科姆贝山。模拟土壤碳的时间动态是可能的(R2=0.89)。用该模型进行的预测表明，从长期来看，随着未燃烧管理的进行，土壤碳储量有增加的趋势。这一增长受气候、土壤质地、采用未燃烧系统的时间和氮肥管理等因素的制约。
Currently there is a trend for the expansion of the area cropped with sugarcane (Saccharum officinarum L.), driven by an increase in the world demand for biofuels, due to economical, environmental, and geopolitical issues. Although sugarcane is traditionally harvested by burning dried leaves and tops, the unburned, mechanized harvest has been progressively adopted. The use of process based models is useful in understanding the effects of plant litter in soil C dynamics. The objective of this work was to use the CENTURY model in evaluating the effect of sugarcane residue management in the temporal dynamics of soil C. The approach taken in this work was to parameterize the CENTURY model for the sugarcane crop, to simulate the temporal dynamics of soil C, validating the model through field experiment data, and finally to make predictions in the long term regarding soil C. The main focus of this work was the comparison of soil C stocks between the burned and unburned litter management systems, but the effect of mineral fertilizer and organic residue applications were also evaluated. The simulations were performed with data from experiments with different durations, from 1 to 60 yr, in Goiana and Timbauba, Pernambuco, and Pradopolis, Sao Paulo, all in Brazil; and Mount Edgecombe, Kwazulu-Natal, South Africa. It was possible to simulate the temporal dynamics of soil C (R-2 = 0.89). The predictions made with the model revealed that there is, in the long term, a trend for higher soil C stocks with the unburned management. This increase is conditioned by factors such as climate, soil texture, time of adoption of the unburned system, and N fertilizer management.