生态学杂志2024，Vol.43Issue(5)：1373-1380,8.DOI:10.13292/j.1000-4890.202405.032
晋西黄土小流域土壤有机碳空间分布特征及其影响因素
Spatial distribution and influencing factors of soil organic carbon in loess small watershed in western Shanxi Province
摘要
Abstract
Vegetation restoration affects the spatial distribution of soil organic carbon(SOC).We examined spatial variations and influencing factors of SOC in small watershed of loess hills and gullies,across four typical sub-water-sheds(Nanbeiyao agricultural land watershed,Beipo artificial forest watershed,Liugou enclosed watershed,and Renzushan natural secondary forest watershed)in Caijiachuan watershed in western Shanxi Province.Through field investigation and indoor analysis,we analyzed the distribution of SOC and its relationship with environmental factors in 0-100 cm profile of watershed scale using classical statistics and geostatistics methods.SOC content varied in dif-ferent sub-watersheds,with Liugou enclosed watershed＞Renzushan natural secondary forest watershed＞Beipo artificial forest watershed＞Nanbeiyao agricultural land watershed.Compared with artificial restoration,natural res-toration accumulated and stored more soil organic carbon.Spatially,SOC decreased gradually from west to east.The distribution pattern of SOC was more uniform with increasing soil depth.Vegetation type,land use pattern,and top-ographic characteristics affected the spatial distribution pattern of SOC at the small watershed scale.The SOC con-tent of shrub-grassland was the highest(14.43±8.91 g·kg-1),followed by forest land(13.11±6.98 g·kg-1),and the agricultural land(8.48±2.98 g·kg1).Compared with agricultural land,the content of SOC in shrub-grassland and forest land was increased by 70.2％and 54.6％,respectively.In 0-20 cm soil layer,the maximum value of SOC occurred when the slope was 15°-25°.In 0-20 cm soil layer,SOC content in different slope direc-tions was in order of shady slope(15.82±7.63 g·kg-1)＞half shady slope(12.94±7.53 g·kg-1)＞half sunny slope(11.48±6.28 g·kg-1)＞sunny slope(11.1±6.19 g·kg-1).The results provide a basis for evaluating soil ecological effects of vegetation restoration in the loess watersheds.Attention should be paid to nature-approaching management of artificial forests and enclosed management of natural forests during vegetation restoration and recon-struction.关键词
黄土高原/小流域/土壤有机碳/空间分布/地统计学Key words
Loess Plateau/small watershed/soil organic carbon/spatial distribution/geostatistics引用本文复制引用
左启林,于洋,查同刚..晋西黄土小流域土壤有机碳空间分布特征及其影响因素[J].生态学杂志,2024,43(5):1373-1380,8.基金项目
国家自然科学基金项目(42177310)资助. （42177310）
