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地球科学进展  2018, Vol. 33 Issue (5): 464-472    DOI: 10.11867/j.issn.1001-8166.2018.05.0464
综述与评述     
荒漠地区大气—土壤的碳交换过程
法科宇1,2(), 雷光春1, 张宇清2, 刘加彬3
1.北京林业大学 自然保护区学院, 北京 100083
2.北京林业大学 水土保持学院宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083
3.西北农林科技大学 资源环境学院, 陕西 杨凌 712100
Carbon Exchange Process Between Atmosphere and Soil in Desert Soils
Keyu Fa1,2(), Guangchun Lei1, Yuqing Zhang2, Jiabin Liu3
1.School of Nature Conservation, Beijing Forestry University, Beijing 100083, China
2.Yanchi Ecology Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
3.College of Natural Resources and Environment, Northwest A & F University, Yangling Shaanxi 712100,China;
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摘要:

由于净初级生产力较低,且自然扰动强烈,荒漠生态系统往往被认为是一巨大碳源。然而,近年来世界范围内的研究发现,荒漠地区的土壤能够吸收大量大气CO2,但该过程因为不能从机理上得到充分地解释而饱受争议。通过深入讨论该反常的碳过程及其可能的驱动机制,认为荒漠土壤吸收大气CO2现象是客观存在的,热力机制、地表湍流和压力梯度改变驱动气体运动机制可能是该过程发生的重要驱动机制。但就目前而言,因无直接证据表明在自然状态下,荒漠地区土壤吸收的碳会普遍且快速运移至地下水体中或矿化封存于土壤中,所以尚不能断言荒漠地区土壤是一个碳汇。未来该领域的研究应关注荒漠地区土壤液相碳的运移问题,尤其关注其气相转化和矿化过程。

关键词: 碳吸收荒漠生态系统非生物途径过程驱动机制碳源/汇    
Abstract:

Because the net primary productivity is low and disturbance effect are strong, desert ecosystems have been proposed conventionally as a carbon source. However, studies worldwide in recent years have reported that desert soils can absorb atmospheric CO2, and the absorbed carbon may be conserved in soils or aquifers. As the carbon uptake is counterintuitive and the mechanisms of this process are elusive, the authenticity of this process is still grossly controversial. In this paper, we deeply discussed the authenticity of the anomalous carbon absorption and its possible driving mechanisms, and conclude that the counterintuitive process is authentic. The thermal mechanism, surficial turbulence and pressure gradients variations driving CO2 migration may be the important driving mechanisms. However, heretofore, no direct evidence can be provided for the speculation that the carbon absorbed by desert soils can commonly and rapidly transport into underground water or mineralize and sequestrate in soil. As a result, the role of carbon sink of desert soils remains veiled. It was suggested that future researches should focus on the transportation and emphatically focus on the gaseous transformation and mineralization of the liquid phase carbon.

Key words: Carbon absorption    Desert ecosystem    Abiotic processes    Driving mechanisms    Carbon source/sink.
收稿日期: 2018-03-13 出版日期: 2018-06-13
ZTFLH:  P934  
基金资助: *中国博士后科学基金项目“沙地土壤次生无机碳的运移过程”(编号:2016M600938);国家自然科学基金项目“半干旱区沙地土壤固定大气二氧化碳的微生物途径”(编号:31670709)资助.
作者简介:

作者简介:法科宇(1987-),男,辽宁本溪人,博士后,主要从事荒漠地区土壤碳过程领域研究.E-mail:fkysparrow@163.com

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法科宇, 雷光春, 张宇清, 刘加彬. 荒漠地区大气—土壤的碳交换过程[J]. 地球科学进展, 2018, 33(5): 464-472.

Keyu Fa, Guangchun Lei, Yuqing Zhang, Jiabin Liu. Carbon Exchange Process Between Atmosphere and Soil in Desert Soils. Advances in Earth Science, 2018, 33(5): 464-472.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2018.05.0464        http://www.adearth.ac.cn/CN/Y2018/V33/I5/464

图1  土壤非生物途径CO2通量驱动机制概念图(a)出通量驱动机制;(b)入通量驱动机制;虚线框表示贡献可能较小,实线框表示贡献较大;(a)中黑框表示出通量CO2源发生机制
图2  毛乌素沙地土壤碳酸盐富集区(a)毛乌素沙地9处土壤剖面;其中黄色虚线框内为碳酸盐结晶体,红色实线框内为碳酸盐结核体;(b)碳酸盐结核体的尺寸
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