摘要
陆地碳循环研究是全球变化研究的重要组成部分。土壤有机碳库作为陆地碳库的主要成分,在地球碳循环中扮演着重要角色。要精确估算土壤有机碳库的储量,就必须确定其组成及动态变化过程。这是我们对土壤碳循环的研究所面临的挑战。尤其在中国,全国性的土壤有机碳库广泛存在于何处尚未可知。本文是一个关于全国性土壤有机碳库储量估算研究项目的报告,数据来自中国第二次全国土壤普查中2473个土壤剖面的实测数据,并经过GIS技术确认。研究结果表明,中国土壤有机碳总储量约为92.4Pg(1Pg=10^(15)g),平均碳密度为10.53kgC/m^2,同时也分析了土壤有机碳的空间分布并将其绘制成图。本项研究提供了碳循环研究的一些基础数据和一个分析方法,同时为中国控制CO_2排放政策的制定提供了科学依据。
Research on the terrestrial carbon cycle is an important component in the study of global change. Soil organic carbon, as the main part of the terrestrial carbon reservoir, plays an important role in the Earth's carbon cycle. To accurately estimate soil organic carbon storage, its composition and dynamic change must be determined. This presents a challenge to research on the soil carbon cycle, especially in China where the nationwide soil organic carbon reservoir largely remains unknown. This paper reports a research project that attempts to estimate the nationwide soil organic carbon reservoir. Data from 2473 soil profiles from the second national soil survey were collected and GIS technology was employed to quantify the national soil carbon reservoir. The analytical results show that the total amount of soil organic carbo_n is about 92. 4 Pq (Pg = 1015g) and that the average carbon density is about 10.53 kg C m-2. The spatial distribution of soil organic carbon was also analyzed and mapped. This study presents basic data and an analysis method for carbon-cycle studies and also provides scientific support for policy-making efforts to control CO2 emissions in China.
