文献类型：期刊文献

英文题名：Spatial variability of soil organic carbon in the forestlands of northeast China

作者：Liu, Ling[1] Wang, Haiyan[1] Dai, Wei[1] Lei, Xiangdong[2] Yang, Xiaojuan[1] Li, Xu[1]

第一作者：Liu, Ling

通信作者：Wang, HY[1]

机构：[1]Beijing Forestry Univ, Coll Forestry, Beijing 100083, Peoples R China;[2]Chinese Acad Forestry, Inst Forest Resource Informat Tech, Beijing 100091, Peoples R China

年份：2014

卷号：25

期号：4

起止页码：867-876

外文期刊名：JOURNAL OF FORESTRY RESEARCH

收录：;Scopus(收录号：2-s2.0-84919882444);WOS:【SCI-EXPANDED(收录号:WOS:000344447900017)】；

基金：Project funding: The study was jointly supported by Natural Science Foundation of China (No. 31270697), the Fundamental Research Funds for the Central Universities (TD2011-2), State Forestry Administrative public service sector project "Key management techniques for the health of typical forest types in China" (20100400201) and National '973' project "Soil carbon stock and its temporal and spatial distribution pattern in natural forests" (2011CB403201).

语种：英文

外文关键词：northeast China; soil organic carbon; spatial variability; geostatistics

摘要：Soil organic carbon (SOC) is an effective indicator of soil fertility and productivity, and it varies spatially and temporally in relation to other soil properties. Spatial variability of SOC in the forestlands of northeast China was characterized using geostatistics. Soil samples at the depths of 0-20 cm, 20-40 cm and 40-60 cm were collected from sixty-three temporary plots to evaluate SOC concentration and density (SOCD) and other soil properties. We analyzed correlations between SOC and soil properties. Soil organic carbon concentrations were high. The total amount of C stored in soil (0-60 cm) was 16.23 kg.m(2) with the highest SOCD of 7.98 kg.m(-2) in topsoil. Soil properties in most cases differed by horizon, suggesting different processes and effects in each horizon. Soil organic carbon had positive relationships with total N, P and K as well as readily available K, but did not show a significant positive correlation with available P. Spatial factors including elevation, slope and aspect affected SOC distribution. Soil organic carbon at 0-60 cm had strong spatial autocorrelation with nugget/sill ratio of 5.7%, and moderate structured dependence was found at 0-20 cm, which indicated the existence of a highly developed spatial structure. Spatial distributions of SOC concentration and SOCD were estimated using regression-kriging, with higher prediction accuracy than ordinary kriging. The fractal dimension of SOC indicated the preferential pattern of SOC distribution, with the greatest spatial heterogeneity and strongest spatial dependence in the northeast-southwest direction.