四川盆地40年耕地土壤化学计量变化特征
Soil stoichiometric characteristics of cultivated land in the Sichuan Basin over 40 years
廖达航 1白银萍 1李富程 2黄晶 1张荣萍 1黄鑫 1刘源 1丁已航 1杨刚1
作者信息
- 1. 西南科技大学生命科学与工程学院 绵阳 621000
- 2. 西南科技大学环境与资源学院 绵阳 621000
- 折叠
摘要
为揭示不同时间和空间维度上四川盆地耕地土壤化学计量的分布与变化特征,以四川东部盆地为研究区,运用地统计分析的方法分析不同时间点(1980年第二次土壤普查和2021年土壤调查)土壤总有机碳(TOC)、总氮(TN)、总磷(TP)元素含量及其化学计量比.(1)半方差分析结果表明,四川盆地耕地土壤化学计量属于中等程度空间自相关,受随机因素(人为因素)和区域结构性因素的共同影响;(2)相较于第二次土壤普查的结果,2021年四川盆地耕层土壤TOC的含量提高了72％,TN提高了45％,TP提高了40％;(3)四川盆地碳氮磷化学计量比时空变化结果显示,土壤C/N、C/P和N/P空间分布较为相似,呈现中部平原低、四周高的分布.综上所述,2021年四川盆地耕地相较于1980年第二次土壤普查,整体上土壤碳、氮、磷的含量提高了,但其化学计量比存在空间分布差异.(图2表3参36)
Abstract
To reveal the distribution and variation characteristics of soil stoichiometry of cultivated land in the Sichuan Basin in China across different temporal and spatial dimensions,the eastern Sichuan Basin was selected as the research area.The contents of total organic carbon,total nitrogen,and total phosphorus and their stoichiometric ratios in soil at different time points(the second soil survey in 1980 and the soil survey in 2021)were analyzed using geostatistical analysis.(1)The semi-variance analysis indicated that the soil stoichiometry of cultivated land in the Sichuan Basin had moderate spatial autocorrelation,influenced by random factors(human factors)and regional structural factors.(2)Compared with the results of the second soil survey,the contents of C,N,and P in the topsoil of the Sichuan Basin increased by 2021:total organic carbon by 72％,total nitrogen by 45％,and total phosphorus by 40％.(3)The spatial and temporal variation of the C/N/P stoichiometric ratio in the Sichuan Basin revealed a similar spatial distribution of soil C/N,C/P,and N/P ratios,being low in the central plain and high in the surrounding areas.In summary,the soil carbon,nitrogen,and phosphorus contents of cultivated land in the Sichuan Basin has generally increased compared with that in the second soil census.However,spatial distribution differences exist.
关键词
四川盆地/耕地/碳/氮/磷/化学计量Key words
Sichuan Basin/cultivated land/carbon/nitrogen/phosphorus/stoichiometry引用本文复制引用
基金项目
四川省自然科学基金(2023NSFSC0758)
国家自然科学基金面上项目(42077038)
出版年
2024
NETL
NSTL
万方数据