基于三维曲面的山地土壤有机碳储量估算研究——以庐山地区为例  

Estimation of Soil Organic Carbon Storage in Mountains Based on the Three-dimensional Curved Surface-aCase Study of Lushan

作　　者：徐莉 张忠启 孙益权 茆彭 XU Li;ZHANG Zhong-qi;SUN Yi-quan;MAO Peng(School of Geography,Geomatics and Planning,Jiangsu Normal University,Xuzhou 221116,China)

机构地区：[1]江苏师范大学地理测绘与城乡规划学院

出　　处：《土壤通报》2019年第5期1101-1107,共7页Chinese Journal of Soil Science

基　　金：国家自然科学基金项目（41201213）;江苏高校优势学科建设工程资助项目（PAPD）;江苏省高等学校自然科学研究项目（18KJB210005）资助

摘　　要：当前区域土壤有机碳(SOC)储量多是基于土壤平面面积进行估算的,其估算结果的误差需要量化评价,尤其在地形复杂区域。本文选择庐山为研究区,基于七个坡度等级样区的二维平面面积及DEM提取的三维曲面面积,得到曲面和平面面积比率(A3D/A2D)与坡度间的量化关系;将庐山地区按高程及其主导土壤类型分为四个区域,结合土壤调查采样数据估算了各区域和整个庐山地区在三维曲面面积和二维平面面积上的土壤有机碳密度(SOCD)和储量,并对比分析了两种面积估算庐山SOC储量结果的差异。结果表明,随着坡度增加,曲面面积与平面面积差异呈指数式增加;从庐山4个高程区域看,坡度最大区域的A3D/A2D值最大,其SOC储量差值比例最高,达到12.13%,坡度最小区域的A3D/A2D值最小,其SOC储量差值比例最小,为6.78%。整个研究区平均坡度为19.55°,其A3D/A2D值为1.10,SOC储量差值比例为9.70%。以上研究表明,地形起伏较大的山地区域,其土层的平面面积与曲面面积有较大差距,对区域土壤碳储量估算有重要影响,计算该地区土壤碳储量时,应充分考虑这种影响,以降低区域碳储量估算的误差。The storages of soil organic carbon(SOC) in the regional scale are generally estimated based on the plane area in recent studies, which leads to the error of the estimated results, especially in complex terrain areas. The quantitative relationship between the ratio of curved surface areas to plane areas(A3 D/A2 D) and slope was obtained in Lushan mountain area by using the three-dimensional planar areas extracted from DEM of seven sample regions. The Lushan area was divided into four regions according to elevation and main soil types. Combined with the soil sampling data, the SOC density(SOCD) and SOC storage were estimated and evaluated in both surface area and plane area. The results showed that, the difference between surface and plane areas increased exponentially with the increase of slope.In the four elevation regions, the region with the largest slope had the greatest value of A3 D/A2 Dand the highest difference ratio in SOC storage(12.13%), and the region with the smallest slope had the least value of A3 D/A2 Dand the lowest difference ratio in SOC storage(6.78%). The average slope, A3 D/A2 Dand the difference ratio in SOC storages in the whole area was 19.55°, 1.10, and 9.7%, respectively. When calculating the SOC storage, we should consider the surface area to mitigate the error of the results, especially in the undulating terrain area.

关 键 词：土壤有机碳储量 山地曲面面积 庐山地区 

分 类 号：S159[农业科学—土壤学]