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精确估算干旱区流域生态系统土壤有机碳库是进行干旱区土壤碳循环研究的重要前提。论文利用改进的土壤类型法———基于网格的土壤类型法,以干旱区典型的三工河流域为例,精确估算流域土壤碳储量,分析土壤碳密度的空间分布特征,为干旱区土壤碳循环研究提供数据支撑。研究结果显示,三工河流域0~20 cm土壤有机碳储量为14.35 Tg,平均土壤有机碳密度为6.70 kgC/m2,其中山地灰褐土土壤有机碳密度最大,这主要是受中山带较低的气温和丰富的森林凋落物的影响;流域土壤有机碳密度表现出了明显的垂直地带性和水平地带性特征,即碳密度从山地区、丘陵区、绿洲区到荒漠区呈逐渐减小的趋势,且随海拔高度的降低碳密度逐渐减小。
Accurate estimation of soil organic carbon pools in arid area watersheds is an important prerequisite for the study of soil carbon cycling in arid areas. In this paper, an improved soil type method based on grid-based soil type method was used to take the typical Sangong River basin in arid area as an example to accurately estimate the soil carbon storage in the basin and to analyze the spatial distribution characteristics of soil carbon density. Carbon cycle research provides data support. The results showed that the organic carbon storage in the 0-20 cm soil layer was 14.35 Tg and the average soil organic carbon density was 6.70 kgC / m2 in the Sangong River Basin, of which the organic carbon density was the highest in the gray soil of the mountainous area, The soil organic carbon density in the basin showed obvious vertical zonal and horizontal zonal characteristics, that is, the carbon density decreased from the mountain area, the hilly area, the oasis area to the desert area Trend, and as the altitude decreases carbon density gradually decreases.