Simulated Soil Organic Carbon Density Changes from 1980 to 2016 in Shandong Province Dry Farmlands Using the CENTURY Model
Simulated Soil Organic Carbon Density Changes from 1980 to 2016 in Shandong Province Dry Farmlands Using the CENTURY Model
复制标题
利用CENTURY模型模拟山东省旱地1980—2016年土壤有机碳密度变化
DOI：
10.3390/su12135384
复制
发表时间：
2020
期刊：
影响因子：
3.9
通讯作者：
Liu Xiaoyu
中科院分区：
文献类型：
--
作者：
Tang Min;Wang Shihang;Zhao Mingsong;Qin Falyu;Liu Xiaoyu
耕作土壤有机碳(SOC)的变化对土壤肥力和大气二氧化碳(CO2)浓度有显著影响。山东省是中国重要的农业和粮食产区。旱地面积占全省总面积的74.15%，研究旱地土壤有机碳的动态变化有助于了解旱地对全国碳(C)清单的贡献。利用土壤层(1：10,000,000)和土地利用层(1：10,000,000)的空间叠置分析，得到2329个旱地土壤多边形，驱动CENTURY模型模拟山东省1980-2016年间土壤有机碳动态变化。结果表明，CENTERY模型可以较好地模拟山东省旱地土壤有机碳。从1980年到2016年，土壤有机碳储量(SOCS)和土壤有机碳密度(SOCD)呈现出先上升后下降的趋势，尤其是在2009年达到最大值之后。2016年全市土壤有机碳总量为290.58×106吨，比1980年增加26.99×106吨。旱地土壤有机碳含量由1980年的23.69t C ha−1增加到2016年的25.94t C ha−1。从1980年到2016年，山东省的旱地一直是碳汇。在4个土纲中，旱作土壤以土壤有机质为主，占旱地的47.81%，其次是全土和荒漠土。土壤有机碳增长率最高(0.23t C ha−1a−1)。与1980年相比，2016年东北、西北和东南地区的SOCD呈上升趋势，而西南地区则呈下降趋势。
The changes in cultivated soil organic carbon (SOC) have significant effects on soil fertility and atmospheric carbon dioxide (CO2) concentration. Shandong Province is an important agricultural and grain production area in China. Dry farmland accounts for 74.15% of the province’s area, so studies on dynamic SOC changes would be helpful to understand its contribution to the Chinese national carbon (C) inventory. Using the spatial overlay analysis of the soil layer (1:10,000,000) and the land use layer (1:10,000,000), 2329 dry farmland soil polygons were obtained to drive the CENTURY model to simulate SOC dynamics in Shandong Province from the period 1980 to 2016. The results showed that the CENTURY model can be used to simulate the dry farmland SOC in Shandong Province. From the period 1980 to 2016, the soil organic carbon storage (SOCS) and soil organic carbon density (SOCD) showed an initial increase and then decreased, especially after reaching a maximum in 2009. In 2016, the SOCS was 290.58 × 106 t, an increase of 26.99 × 106 t compared with 1980. SOCD in the dry farmland increased from 23.69 t C ha−1 in 1980 to 25.94 t C ha−1 in 2016. The dry farmland of Shandong Province was a C sink from 1980 to 2016. Among the four soil orders, inceptisols SOCD dominated, and accounted for 47.81% of the dry farmland, followed by >entisols > vertisols > alfisols. Entisols SOCD growth rate was the highest (0.23 t C ha−1year−1). Compared to 1980, SOCD in 2016 showed an increasing trend in the northeast, northwest and southeast regions, while it followed a downward trend in the southwest.