| 基于GIS的陕西省土壤有机碳估算及其空间差异分析 |
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| 引用本文： | 刘宪锋,任志远,林志慧.基于GIS的陕西省土壤有机碳估算及其空间差异分析[J].资源科学,2012,34(5):911-918. |
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| 作者姓名： | 刘宪锋 任志远 林志慧 |
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| 作者单位： | 1. 陕西师范大学旅游与环境学院,西安,710062
2. 陕西师范大学旅游与环境学院,西安710062／陕西师范大学西北国土资源研究中心,西安710062 |
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| 基金项目： | 国家自然科学基金资助项目(编号:41071057);教育部人文社会科学重点研究基地重大项目(编号:2009JJD770025)。 |
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| 摘 要： | 本文旨在估算陕西省土壤有机碳密度和储量及分析其空间差异特征，为准确评价陕西省土地质量以及环境质量提供参考。利用陕西省第二次土壤普查数据，采用土壤类型法计算了陕西省各土壤类型不同土层深度的土壤有机碳密度和储量，建立了以土属为单元的土壤有机碳空间数据库，分析其空间差异特征，并对影响土壤有机碳的自然和人为因素进行分析。结果表明：0．20em、0～100cm和全剖面土层中土壤有机碳平均密度分别为3．886kg／m^2，8．955kg／m^2，10．548kg／m^2，0～20em、0～100cm和全剖面土层中土壤有机碳的储量分别为7．7444亿t，17．845亿t，21．0204亿t。土壤有机碳密度在空间上呈现由北向南逐渐增加的趋势，而土壤有机碳储量高值区主要分布在榆林的东南部、延安地区、铜川、咸阳、宝鸡的北部以及秦巴山区等地，碳储量较低的区域主要有榆林的府谷县、神木县、定边县等地，以及关中的大部分地区。土壤有机碳密度随气温和降水的增加而逐渐增加，不同土地利用类型中，土壤有机碳密度大小排序为：林地〉草地〉耕地，土地利用类型变化是影响土壤有机碳最主要的人为因素。
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| 关 键 词： | 陕西省 GIS 土壤有机碳 空间差异 |
| 收稿时间： | 1/3/2012 12:00:00 AM |
Estimation of Soil Organic Carbon in Shaanxi Province and Analysis of Its Spatial Difference Based on GIS |
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| LIU Xianfeng,REN Zhiyuan and LIN Zhihui.Estimation of Soil Organic Carbon in Shaanxi Province and Analysis of Its Spatial Difference Based on GIS[J].Resources Science,2012,34(5):911-918. |
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| Authors: | LIU Xianfeng REN Zhiyuan and LIN Zhihui |
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| Institution: | 1(1.College of Tourism and Environment,Shaanxi Normal University,Xi’an 710062,China;2.Northwest Land and Resources Research Center,Shaanxi Normal University,Xi’an 710062,China) |
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| Abstract: | Terrestrial ecosystem carbon cycle is considered to be an important issue in the study of global change.Soil organic carbon is a huge carbon library,tiny change of which is likely to cause significant change of atmospheric CO2,thus influencing global climate.Therefore,research on soil organic carbon reserves and its spatial distribution characteristics not only has significant guiding meanings to circulation of materials in all circles and global change,but also has important realistic meanings to agricultural economy and land sustainable development.This article aims to estimate the density and reserves of soil organic carbon in Shaanxi Province,providing reference for accurate evaluation of the land quality and environment quality.With the second soil census data of Shaanxi Province and the soil type method.We have calculated the soil organic carbon density and reserves of different soil types in different soil depth and established soil organic carbon spatial database with soil genus as a unit so as to analyze the spatial distribution of soil organic carbon in Shaanxi Province as well as the natural and human influence factors.The results show that the average density of soil organic carbon in soil layers of 0~20cm,0~100cm and full soil profile are respectively 3.886kg/m2,8.955 kg/m2 and 10.548 kg/m2,and the soil organic carbon reserves of them are 774.4 million t,1784.5 million t and 2102 million t respectively.The spatial distribution of soil organic carbon density presents a trend of increase gradually from the north to the south.Areas with high soil organic carbon reserves are mainly distributed in the southeast of Yulin,Yan’an,Xianyang,the north of Baoji and Qinba mountain while areas with low reserves are mainly distributed in the northeast of Yulin,such as Fugu county,Shenmu county,Dingbian county and most parts of Guanzhong region.Soil organic carbon density increases gradually with the growing annual precipitation and temperature.For different land use types,forest land has the lardgest soil organic carbon density,followed by grassland and cultivated land.And the change of land use type is the leading human factor that affects soil organic carbon. |
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| Keywords: | Shaanxi Province GIS Soil organic carbon Spatial diifference |
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