摘要
为了解三峡库尾地区土壤有机碳的分布特征及影响因素,基于Arc GIS水文分析模块和数字高程模型图将重庆笋溪河流域划分为6个集水区,分别采集“园、林、耕”3种土地利用方式不同土层(0~20和20~40 cm)的土壤,测定有机碳含量并估算储量,采用方差分析、相关性分析和冗余分析探究研究区土壤有机碳的空间分布特征及其与各环境因子之间的响应关系。结果表明:随土层深度增加,土壤有机碳含量和储量均呈下降趋势,不同土层土壤有机碳含量和储量存在显著差异(P<0.05)。园地、林地和耕地0~40 cm的土壤有机碳储量范围分别为16.42~76.67,15.87~74.85和26.35~81.37 t·hm。在20~40 cm土层中,耕地的土壤有机碳储量显著高于园地和林地(P<0.05),表现为耕地>园地>林地。两个土层中土壤有机碳含量和储量均与土壤全氮含量呈极显著正相关(P<0.01),而与其他指标的相关性不显著(P>0.05)。各环境因子对园地、林地和耕地土壤有机碳含量和储量的总解释率分别为86.50%,88.51%和86.13%,均强烈反映出地形及土壤理化性质对该地区土壤有机碳的影响。重庆笋溪河流域不同土地利用方式下土壤有机碳具有表聚性,且受土壤全氮含量影响显著,耕地具有较高的固碳潜力。
In this study, we aimed to understand the distribution characteristics and influencing factors of soil organic carbon in the tail area of the Three Gorges Reservoir Area. Based on the hydrological analysis module of ArcGIS and the digital elevation model, the Sunxi River Basin, Chongqing, was divided into six catchments. Soil organic carbon content and carbon stock were measured in three typical land use patterns, namely, garden land, cultivated land, and forest land at depths of 0-20 and 20-40 cm in the catchment areas. One-way analysis of variance, correlation analysis, and redundancy analysis were performed to examine the spatial distribution characteristics of soil organic carbon and its response to environmental factors in the study area. The results showed that the soil organic carbon content and stock decreased with increase in soil depth and were significantly different at varied soil depths(P<0.05). Soil organic carbon stock ranged 16.42-76.67, 15.87-74.85, and 26.35-81.37 t·hmin garden land, forest land, and cultivated land, respectively. At a depth of 20-40 cm, the soil organic carbon stock in cultivated land was significantly higher than that in garden and forest lands(P<0.05), ranking in the descending order of cultivated land>garden land>forest land. Soil organic carbon content and stock at depths of 0-20 and 20-40 cm were significantly positively correlated with soil total nitrogen(P<0.01) but not significantly correlated with other indicators(P>0.05). The total interpretation rate of soil organic carbon content and stock explained by various environmental factors was 86.50%, 88.51%, and 86.13%, respectively, for garden land, forest land, and cultivated land, which strongly reflected the effects of topography and physico-chemical properties on soil organic carbon in this area. Soil organic carbon presented surface accumulation in different land use patterns and was greatly affected by soil total nitrogen. The cultivated land showed greater carbon sequestration potential.
作者
宁一泓
王海燕
侯文宁
孟海
赵晗
崔雪
NING Yihong;WANG Haiyan;HOU Wenning;MENG Hai;ZHAO Han;CUI Xue(College of Forestry,Beijing Forestry University,Beijing 100083,China;Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing 100083,China)
出处
《森林与环境学报》
CSCD
北大核心
2022年第5期552-560,共9页
Journal of Forest and Environment
基金
国家“十三五”重点研发计划“三峡库区面源污染景观生态防治技术集成与示范”(2017YFC0505306)。
关键词
笋溪河
土壤有机碳
土地利用方式
有机碳储量
Sunxi River
soil organic carbon
land use pattern
organic carbon stock
