青海东部表层土壤有机碳密度及其空间分布特征

doi:10.11720/wtyht.2023.1287

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摘要

整合了青海省东部地区33 092 km²多目标区域地球化学调查和土地质量地球化学调查数据,估算了研究区表层土壤有机碳总储量为171.16 Mt,平均有机碳密度为5 172.14 t/km²,并分析了表层土壤有机碳空间分布特征和主要影响因素。结果表明:在高山和中低山地貌、草原土和草甸土土壤类型、残坡积物成土母质、林草地和高山稀疏植被区土地利用、草原和森林系统下,表层土壤有机碳平均密度明显偏高,在沙漠地貌、风沙土土壤类型和风成砂成土母质区表层土壤有机碳密度最低,说明地形地貌(海拔高低)、成土母质、气候及植被均对表层土壤有机碳密度及分布规律产生影响。与青海省土壤第二次普查数据有机碳储量对比,在过去20多年里青海东部表层土壤共释放约53.21 Mt有机碳,表明在长期耕种、过度砍伐和放牧等人类生产活动影响下土壤有机碳已出现一定程度的下降。

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	刘庆宇
	马瑛
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	张亚峰
	苗国文
	黄强
	韩思琪

关键词 ：土壤有机碳密度, 分布特征, 表层土壤, 土壤类型, 青海东部

Abstract：

This study integrated the data of both the multi-purpose regional geochemical survey and land quality geochemical survey covering an area of 33 092 km² in eastern Qinghai. Based on these data, the total organic carbon storage of topsoil in the study area was estimated to be 171.16 Mt, with an average organic carbon density of 5 172.14 t/km². Moreover, this study analyzed the spatial distribution and main influencing factors of organic carbon in topsoil. As indicated by the results, the average density of organic carbon in topsoil is significantly high in high and middle-low mountains, grassland and meadow soils, soil parent materials of eluvial-slope deposits, forest grasslands, and alpine sparse vegetation areas, grassland and forest and is the lowest in deserts, aeolian sandy soil, and soil parent material areas of aeolian sands. This finding means that factors including topography (altitude), soil parent materials, climate, and vegetation affect the density and distribution of organic carbon in topsoil. Compared with the organic carbon storage revealed by the second general detailed soil survey in Qinghai, 53.21 Mt of organic carbon has been released from the topsoil of eastern Qinghai in the past 20 years. This result indicates that the soil organic carbon has decreased to a certain extent under the influence of human production activities such as long-term cultivation, overcutting, and overgrazing.

Key words： soil organic carbon density distribution characteristics topsoil soil type eastern Qinghai

收稿日期: 2022-06-04 修回日期: 2022-11-03 出版日期: 2023-08-20

ZTFLH:	S153.6
	X142

基金资助:青海省省级地质勘查专项资金项目“青海省玉树市地区1:25万土地(牧草地)质量地球化学调查”(2022012019jc013);中国地质调查局国家公益性地质调查专项“青海门源—湟中地区1:25万土地质量地球化学调查”(DD20160319-07)

作者简介: 刘庆宇(1987-),男,理学学士,工程师,主要研究方向为农业地球化学、生态环境等。Email: 452250910@qq.com

引用本文:

刘庆宇, 马瑛, 程莉, 沈骁, 张亚峰, 苗国文, 黄强, 韩思琪. 青海东部表层土壤有机碳密度及其空间分布特征[J]. 物探与化探, 2023, 47(4): 1098-1108.
LIU Qing-Yu, MA Ying, CHENG Li, SHEN Xiao, ZHANG Ya-Feng, MIAO Guo-Wen, HUANG Qiang, HAN Si-Qi. Density and spatial distribution of organic carbon in the topsoil of eastern Qinghai. Geophysical and Geochemical Exploration, 2023, 47(4): 1098-1108.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.1287 或 https://www.wutanyuhuatan.com/CN/Y2023/V47/I4/1098

Fig.1 青海东部地区交通位置

Fig.2 青海东部地区地形地貌(a)、土壤类型(b)、土地利用(c)、生态系统分区(d)

Table 1 中国典型地区表层土壤有机碳密度及储量特征

Fig.3 青海东部地区表层土壤单位有机碳密度分布

Table 2 青海东部地区不同地貌有机碳储量和密度分布

Table 3 青海东部地区不同土壤类型有机碳储量和密度分布

Table 4 青海东部地区不同成土母质有机碳储量和密度分布

Table 5 青海东部地区不同土地利用类型有机碳储量和密度分布

Table 6 青海东部地区不同生态系统有机碳储量和密度分布

Fig.4 青海东部地区近20年表层土壤有机碳储量变化趋势

Table 7 青海东部地区不同土壤类型有机碳储量变化趋势统计

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