云南省深层土壤有机碳的估算及其影响因素分析  

Estimation of Deep Soil Organic Carbon in Yunnan Province and Its Influencing Factors

作　　者：楚梦玮 侯巍楹 净婷菲 常兆峰 段文焱 周丹丹[1,2] 李芳芳 CHU Mengwei;HOU Weiying;JING Tingfei;CHANG Zhaofeng;DUAN Wenyan;ZHOU Dandan;LI Fangfang(Faculty of Environmental Science&Engineering,Kunming University of Science&Technology,Kunming 650500,China;Yunnan Provincial Key of Soil Carbon Sequestration and Pollution Control,Kunming 650500,China)

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650500 [2]云南省土壤固碳与污染控制重点实验室,云南昆明650500

出　　处：《云南农业大学学报（自然科学版）》2021年第3期516-523,共8页Journal of Yunnan Agricultural University:Natural Science

基　　金：国家自然科学基金青年基金(41907300,41703121);云南省重点研发计划(2018BC004)。

摘　　要：【目的】深层土壤有机碳库是陆地碳库的重要组成,研究云南省深层土壤有机碳的含量及其影响因素,对云南土壤中污染物的迁移和农作物的生长具有重要意义。【方法】收集云南省第二次土壤普查资料中570个土壤统计剖面数据,运用土壤类型法对云南省深层土壤有机碳密度(SOCD)进行估算;根据云南省土壤类型图,统计云南省不同类型土壤的深层土壤有机碳储量(SOCR);使用ArcGIS绘制深层SOCD的空间分布图,与云南省表层土壤空间分布进行比较;结合单因素分析对影响土壤有机碳含量的因素进行研究。【结果】根据Van Bemmelen系数估算所得:云南省30~200 cm深层平均SOCD为44.21 t/hm^(2),SOCR为1.67×10~9 t。深层SOCD由滇东南向滇西北方向逐渐增大,与云南省表层土SOCD变化规律相似;并且深层SOCD的分布受海拔、降水量和温度的影响,深层SOCD值与海拔和年均降水量呈正相关,温度与深层SOCD则呈负相关。【结论】云南省深层土壤SOCD大于全国SOCD的平均值,但均小于云南省0~20 cm表层SOCD。本研究对未来其他地区深层土壤有机碳的研究具有重要参考价值。[Purpose]Since the deep soil organic carbon pool is a vital component of the terrestrial carbon pool,we studied the content of deep soil organic carbon in Yunnan Province and its influencing factors,which are of great significance to the migration of pollutants in Yunnan soil and the growth of crops.[Method]The soil organic carbon density(SOCD)and soil organic carbon reserves(SOCR)from deep soils were estimated based on 570 soil profile from the second soil survey data of Yunnan Province by soil type method.Besides,the spatial distribution map of SOCD was drawn by ArcGIS,and its influencing factors were studied by single factor analysis.[Result]According to the estimation by Van Bemmelen coefficient,the value of 30-200 cm average SOCD in Yunnan Province was 44.21 t/hm^(2),and the total SOCR in Yunnan Province was 1.67×109 t.The deep SOCD gradually increased from the Southeast to the Northwest of Yunnan,which was similar to the SOCD change pattern of the surface soil in Yunnan Province.Meanwhile,the distribution of deep SOCD was affected by altitude,precipitation,and temperature.The deep SOCD values were positively correlated with altitude and average annual precipitation,while the temperature was negatively correlated with deep SOCD.[Conclusion]The SOCD of deep soil in Yunnan Province was greater than the national average SOCD,but both were less than the SOCD of 0-20 cm surface layer in Yunnan Province.This research is of great significance to the study of deep soil organic carbon in other regions in the future.

关 键 词：深层土 土壤有机碳密度 土壤有机碳储量 估算 

分 类 号：S151.9[农业科学—土壤学]