三江源地带性土壤铁(铝)键合碳分布特征  

Distribution Characteristics of Fe(Al)-C in Zonal Soils of the Three-River Source Region

作　　者：周少龙 李月梅[2] 张志春 甄国赟 孙丰豪 欧建芳 ZHOU Shaolong;LI Yuemei;ZHANG Zhichun;ZHEN Guoyun;SUN Fenghao;OU Jianfang(College of agriculture and animal husbandry,Qinghai University,Xining 810016,China;Academy of Agriculture and Forestry Sciences,Qinghai University,Xining 810016,China;Qinghai Province Haibei Meteorological Bureau,Haibei,Qinghai 810299,China;Qinghai Province Meteorological Disaster Prevention Technology Center,Xining 810001,China;College of Grassland Science,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]青海大学农牧学院,西宁810016 [2]青海大学农林科学院,西宁810016 [3]青海省海北州气象局,青海海北810299 [4]青海省气象灾害防御技术中心,西宁810001 [5]新疆农业大学草业学院,乌鲁木齐830052

出　　处：《土壤学报》2024年第4期1031-1041,共11页Acta Pedologica Sinica

基　　金：青海省应用基础研究计划(2019-ZJ-7015)。

摘　　要：为了解青藏高原腹地天然草地土壤稳定性碳储量,掌握其固碳能力和增汇潜力,将三江源地区土壤按地域空间和3种典型草地类型进行划分,以活动层土壤为对象,进行土壤总有机碳(TOC)及铁(铝)键合碳[Fe(Al)-C]分析,并与地理、气候资料建立关系模型,反演近60年(1961-2020年)时空变化规律。结果表明:(1)三江源地区Fe(Al)-C平均含量6.07 g·kg^(-1),[Fe(Al)-C]/TOC平均16.87%,其含量分布地带性特征明显,中、东部地区显著高于西部地区(P<0.05);(2)3种草地类型Fe(Al)-C含量在2.35~8.81 g·kg^(-1)之间,[Fe(Al)-C]/TOC为11.99%~20.52%,高山灌丛草甸和高寒草甸均显著高于高寒草原(P<0.05);3种高寒草地Fe(Al)-C与TOC呈极显著正相关(P<0.01);(3)模拟数字化制图结果显示,近20年(2001-2020年)三江源地区Fe(Al)-C分布面积变化相比过去两个时段(1961-1980年和1981-2000年,其含量≥5.75 g·kg^(-1)的分布面积平均增加了1.64%),整体处于碳汇状态,三江源地区土壤铁(铝)键合碳在土壤稳定中的固碳潜力不容忽视。【Objective】This study aimed to understand the soil stable organic carbon(SSOC)storage of natural grassland in the hinterland of the Qinghai-Tibet Plateau,and clarify its carbon fixation capacity and potential for increasing sinks.【Method】The soil in the Three-River Source Region was divided according to regional space and three typical grassland types and the active layer soil was taken as the object.The soil total organic carbon(TOC)and Iron(aluminum)-bounded carbon[Fe(Al)-C]were analyzed,the relationship model was established with the geographical and climatic data,and the temporal and spatial variation law in recent 60 years(1961-2020)was retrieved.【Result】The results show that:(1)The average content of Fe(Al)-C is 6.07 g·kg^(-1) and the average content of[Fe(Al)-C]/TOC is 16.87%in the Three-River Source Region,with obvious zonal characteristics.Also,the content in the central and eastern regions was significantly higher than that in the western region(P<0.05);(2)The contents of Fe(Al)-C and[Fe(Al)-C]/TOC in the three types of grassland were 2.35-8.81 g·kg^(-1)and 11.99%-20.52%,respectively,and the alpine shrub meadow and alpine meadow were significantly higher than those in alpine steppe(P<0.05).Fe(Al)-C was positively correlated with TOC in the three typical natural grassland types(P<0.01).(3)The results of analog-digital mapping showed that the distribution area change of Fe(Al)-C in the Three-River Source Region has changed in the recent 20 years(2001-2020).Compared with the past two periods;1961-1980 and 1981-2000,the distribution area with its content>5.75 g·kg^(-1) and increased by 1.64%on average.【Conclusion】From our analysis,it was deduced that whole area is in a state of carbon sink,and the C fixation potential of Fe(Al)-C in soils in the Three-River Source Region can not be overlooked.

关 键 词：三江源 青藏高原 铁(铝)键合碳 土壤碳库稳定性 时空演变 气候变化 

分 类 号：TP399[自动化与计算机技术—计算机应用技术] S153.6[自动化与计算机技术—计算机科学与技术]