三江源地带性土壤铁(铝)键合碳分布特征
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1.青海大学、青海省海北州气象局;2.青海大学农林科学院;3.青海省气象灾害防御技术中心;4.青海省海北州气象局;5.新疆农业大学

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青海省应用基础研究计划(2019-ZJ-7015)


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

1.Qinghai Haibei Meteorological Office 、Qinghai University College of Agriculture and Animal Husbandry;2.Academy of Agriculture and Forestry Sciences,Qinghai University;3.Qinghai Province Meteorological Disaster Prevention Technology Center;4.Qinghai Province Haibei Meteorological Bureau;5.Xinjiang Agricultural University;6.Qinghai province Meteorological Disaster Prevention Technology Center

Fund Project:

Qinghai Applied Basic Research Program (No.2019-ZJ-7015)

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    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)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,[Fe (Al)-C]/TOC 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。

    Abstract:

    【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-1and 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.

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周少龙,李月梅,张志春,甄国赟,孙丰豪,欧建芳.三江源地带性土壤铁(铝)键合碳分布特征[J].土壤学报,DOI:10.11766/trxb202212130690,[待发表]
ZHOU Shaolong, LI Yuemei, ZHANG Zhichun, ZHEN Guoyun, SUN Fenghao, OU Jianfang. Distribution Characteristics of Fe (Al)-C in Zonal Soils of the Three-River Source Region[J]. Acta Pedologica Sinica, DOI:10.11766/trxb202212130690,[In Press]

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  • 收稿日期:2022-12-13
  • 最后修改日期:2023-08-25
  • 录用日期:2023-10-23
  • 在线发布日期: 2023-11-02
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