华南地区森林土壤有机碳和全氮密度及储量估算  

Estimation of forest soil organic carbon and total nitrogen density and storage in South China

作　　者：张亦凡 王海燕[1] 高子滢 仇皓雷 ZHANG Yi-fan;WANG Hai-yan;GAO Zi-ying;QIU Hao-lei(State Key Laboratory of Efficient Production of Forest Resources,Key Laboratory of Forest Cultivation and Protection,Ministry of Education,College of Forestry,Beijing Forestry University,Beijing 100083)

机构地区：[1]林木资源高效生产全国重点实验室,森林培育与保护教育部重点实验室,北京林业大学林学院,北京100083

出　　处：《中国土壤与肥料》2024年第12期17-26,共10页Soil and Fertilizer Sciences in China

基　　金：国家科技基础资源调查专项(2021FY100801)。

摘　　要：土壤在调节森林生态系统碳氮循环,提高碳、氮储量及维持生态平衡等方面起着关键作用。华南地区森林土壤有机碳和全氮储量估算以及有机碳和全氮含量和密度的垂直变化和空间分布特征研究可为森林土壤碳、氮储量预测及碳氮库管理提供数据支撑。基于2005—2023年华南地区森林土壤有机碳和全氮含量历史文献数据,通过构建森林土壤密度与有机质回归模型,估算土壤有机碳和全氮密度及储量;采用统计学与地统计学方法探讨华南地区0~60 cm土层森林土壤有机碳和全氮含量及密度的变化特征,并分析其影响因素。结果表明:(1)华南地区0~60 cm土层森林土壤有机碳密度均值和储量分别为3.53 kg·m^(-2)、2452.13 Tg C,全氮密度均值和储量分别为0.27 kg·m^(-2)、194.30 Tg N;各省份土壤有机碳和全氮密度及储量表现为广西>广东>海南;(2)普通克里金插值结果显示,各土层土壤有机碳和全氮密度均表现出明显的空间异质性,且空间分布特征相似,总体表现为全区北部和中部偏西较高、南部沿海地区低;(3)海拔、土壤密度和全磷是影响华南地区土壤有机碳和全氮密度及储量变化的关键因子。综上,利用有机密度模型计算缺失土壤密度,基于土壤类型法估算森林土壤碳、氮密度及储量,能有效预测土壤碳、氮储量及管理碳氮库;华南地区0~60 cm土层森林土壤碳氮密度存在明显的空间分布规律,其在各省份间差异显著。Soil plays a key role in regulating carbon and nitrogen cycle,promoting carbon and nitrogen storage and maintaining ecological balance in forest ecosystem.The vertical variation and tempo-spatial distribution characteristics of forest soil organic carbon and total nitrogen content and density in South China were explored so as to provide data support for forest soil carbon and nitrogen storage prediction and management.Based on the historical data of forest soil organic carbon and total nitrogen content in South China from 2005 to 2023,a regression model of soil bulk density and organic matter was established to estimate soil organic carbon and total nitrogen density and storage.By using statistics and geostatistics methods,the change characteristics of forest soil organic carbon and total nitrogen content,density and storage in 0-60 cm soil layer in South China was investigated,and the influencing factors was analyzed.The results showed that:(1)The average density and storage of soil organic carbon in 0-60 cm soil layer in South China were 3.53 kg·m^(-2)and 2452.13 Tg C,respectively,and the average density and storage of total nitrogen were 0.27 kg·m^(-2)and 194.30 Tg N,respectively.The soil organic carbon and total nitrogen density and stock in different provinces were in the order of Guangxi>Guangdong>Hainan;(2)The Kriging interpolation showed that the spatial distribution characteristics of forest soil organic carbon and total nitrogen density were similar in all soil layers with heterogeneity,and the overall distribution characteristics indicated higher in the northern and central parts by west,and lower in the southern coastal areas.Higher soil organic carbon density and lower total nitrogen density were found in the northeast.(3)Elevation,soil bulk density and total phosphorus were the key factors for the change of soil organic carbon and total nitrogen density and storage in South China.In conclusion,the supplement of missing soil bulk density using the organic density model can help effectively predict

关 键 词：华南地区 森林土壤 土壤有机碳 土壤全氮 回归模型 空间异质性 

分 类 号：S15[农业科学—土壤学]