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明确不同来源土壤剖面数据建立的大、中、小系列制图比例尺对旱地有机碳储量估算的影响对于全球碳循环研究具有重要意义。以江苏北部(简称“苏北地区”)3.9×106多hm2旱地为例,系统分析了我国目前常用《县级土种志》、《地级市土种志》、《省级土种志》和《中国土种志》中记录的土壤剖面数据分别建立的1∶5万、1∶25万、1∶50万、1∶100万、1∶400万和1∶1 000万数据库对有机碳储量估算的影响。结果表明,与数据最详细、记录有983个土壤剖面的《县级土种志》1∶5万尺度有机碳密度和储量相比,其他土壤数据源建立的不同制图尺度数据库相对偏差分别在1.94%~23.53%与0.02%~22.86%之间,T检验表明大多数制图尺度土壤数据库的估算结果与《县级土种志》1∶5万尺度之间存在极显著差异(p<0.001),这说明在今后国家或区域尺度土壤有机碳储量估算中选择适宜的土壤数据源和制图尺度是非常重要的。
It is of great significance for the global carbon cycle research to clarify the impact of large, medium and small series of mapping scales established by soil profile data from different sources on the estimation of organic carbon stocks in drylands. Taking the area of 3.9 × 106 hm2 dry land in northern Jiangsu Province as an example, this paper systematically analyzes the current situation of “Native Soil Species”, “Native Soil Species”, “Provincial Soil Species 50000, 1: 250000, 1: 50000, 1: 1000000, 1: 40000, and 1: 10 million database pairs of soil profile data recorded in ”Soil Species“ and ”Soil Species of China“ Impact of organic carbon stock estimates. The results showed that the relative deviations of different mapping datasets established by other soil data sources were 1.94% and 1.94%, respectively, compared with the 1: 50000-size organic carbon density and reserves of ”County Soil Species“ recorded in 983 soil profiles with the most detailed data. % ~ 23.53% and 0.02% ~ 22.86% respectively. The T test indicated that there was a significant difference (p <0.001) between the estimation results of most soil mapping databases at the mapping scale and 1:50 000 scales of ” This shows that it is very important to select appropriate soil data sources and mapping scales in future estimates of soil organic carbon reserves at the national or regional scales.