Litter carbon inputs to the mineral soil of Japanese Brown forest soils: comparing estimates from the RothC model with estimates from MODIS
Litter carbon inputs to the mineral soil of Japanese Brown forest soils: comparing estimates from the RothC model with estimates from MODIS
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DOI：
10.1007/s10310-010-0209-6
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发表时间：
2011-02-01
影响因子：
1.5
通讯作者：
Smith, Pete
中科院分区：
文献类型：
--
作者：
Hashimoto, Shoji;Wattenbach, Martin;Smith, Pete
土壤中的有机碳水平是凋落物进入土壤和分解之间平衡的结果。凋落物对土壤的输入与净初级生产力（NPP）密切相关，在平衡状态下，NPP等于凋落物对土壤的输入。植物凋落物输入到30厘米深的矿质土壤中估计日本森林使用的Rothamsted碳模型（RothC）和土壤有机碳（SOC）含量的平均值，并与估计的凋落物输入NPP数据集从中分辨率成像光谱仪（MODIS）进行了比较。通过对输入SOC的Monte Carlo不确定性分析，揭示了模型对输入SOC的敏感性和不确定性。利用RothC计算的凋落物碳输入与MODIS NPP计算的凋落物碳输入呈正相关，但RothC估算的凋落物碳输入比MODIS估算的平均值小17.2%。绘制归一化差异揭示了差异中的空间偏差。这种差异可能是由于MODIS算法和RothC模型的温度控制不同，以及我们在RothC计算中的简单假设。这种比较揭示了从SOC数据估计的凋落物输入和从基于卫星的NPP数据估计的凋落物输入之间的密切联系。估计数之间的差异值得进一步研究。
The level of organic carbon found in soil is the result of the balance between litter input to the soil and decomposition. Litter input to the soil is closely related to net primary production (NPP); at equilibrium, the NPP is equal to the litter input to soil. Plant litter input to a depth of 30 cm in the mineral soil was estimated for Japanese forest using the Rothamsted Carbon model (RothC) and an average value of soil organic carbon (SOC) content, and was compared with estimated litter inputs from the NPP dataset from Moderate Resolution Imaging Spectroradiometer (MODIS). A Monte Carlo uncertainty analysis of the input SOC was also conducted in order to reveal the sensitivity and uncertainty of the model to input SOC. The litter carbon input calculated using RothC and that derived from MODIS NPP were positively correlated, but the mean estimated litter input from RothC was 17.2% smaller than that estimated from MODIS. Mapping the normalized difference revealed spatial biases in the difference. The discrepancy was probably because of the different temperature controls for the MODIS algorithm and the RothC model, and also our simple assumption in the RothC calculation. This comparison reveals a close link between litter inputs estimated from SOC data and litter inputs estimated from satellite-based NPP data. The discrepancies between the estimates merit further study.