取样和计算方法对黑土剖面土壤有机碳密度的影响  

Influences of methods of sampling and calculation on soil organic carbon density in soil profiles of Mollisols

作　　者：郑琳[1,2] 韩晓增[1,2] 郝翔翔[2] 任红玉[1] 李禄军[2] 

机构地区：[1]东北农业大学资源与环境学院,哈尔滨150030 [2]中国科学院东北地理与农业生态研究所,哈尔滨150081

出　　处：《生态学杂志》2015年第9期2583-2589,共7页Chinese Journal of Ecology

基　　金：中国科学院重点部署项目(KZZD-EW-TZ-16);中国科学院东北地理与农业生态研究所优秀青年人才项目(DLSYQ13001);中国科学院战略性科技先导专项(XDA05050501);中国科学院青年创新促进会项目资助

摘　　要：土壤有机碳密度（SOCD）和储量的准确估算对于评估土壤有机碳在气候变化中的作用至关重要。本文以4种不同土地利用方式（草地、裸地、农田和林地）为例,探讨不同取样方法（按固定深度取样和按土壤自然发生层次取样）和不同计算方法（基于等体积和基于等质量计算）对黑土剖面SOCD结果的影响。结果表明,4种土地利用方式下,按固定深度和按发生层次取样所得SOCD均存在显著差异,但不同土地利用方式下二者大小关系不同。基于等体积计算SOCD时,林地和草地表层（0~30 cm）SOCD显著低于基于等质量计算方法所得SOCD,而对于更深层次土体（100和200 cm）,计算方法对SOCD的影响不显著。因此,在实践中估算土壤有机碳储量时,应针对具体的土地利用方式,根据研究目的选取适宜的取样和计算方法。另外,当计算较深层次土体SOCD时,可不考虑计算方法对SOCD结果的影响。Accurate estimation of soil organic carbon density（ SOCD） and storage plays a crucial role in evaluating the function of soil organic carbon in climate change. Taking four land-use types（ bare land,grassland,cropland,and forest land） as examples,we explored the differences in SOCD of Mollisols profiles by using different methods of soil sampling（ based on fixed soil depth and pedogenic horizon） and calculation of SOCD（ based on equivalent soil volume（ ESV） and equivalent soil mass（ ESM））. The results showed there were significant differences in SOCD between the two different methods of soil sampling under the four land-use types. The order of SOCD based on fixed sampling depths and pedogenic horizon depended on land-use types. The values of ESV-based SOCD（ 0-30 cm） in forest land and grassland were significantly lower than those based on ESM method,whereas no significant impacts of the calculation methods on SOCD were observed for the deeper layers（ 100 and 200 cm）. Our study suggests that appropriate methods of soil sampling and SOCD calculation should be considered according to given types of land uses and study purposes for estimation of soil storage. In addition,we can ignore the impact of the calculation method on SOCD in the deeper soil layers.

关 键 词：土壤有机碳密度 黑土 土壤发生层 碳储量 

分 类 号：S153.6[农业科学—土壤学]