中国沙漠 ›› 2020, Vol. 40 ›› Issue (5): 180-189.DOI: 10.7522/j.issn.1000-694X.2020.00075
收稿日期:
2020-07-07
修回日期:
2020-08-19
出版日期:
2020-09-28
发布日期:
2020-09-28
通讯作者:
毛伟
作者简介:
毛伟(E-mail: maow@lzb.ac.cn)基金资助:
Tianyan Su(), Wenjie Liu, Qiu Yang, Wei Mao()
Received:
2020-07-07
Revised:
2020-08-19
Online:
2020-09-28
Published:
2020-09-28
Contact:
Wei Mao
摘要:
地下水位通过影响土壤微生物活性、植物根系周转和土壤呼吸速率等改变凋落物和土壤有机质的分解速率与程度,进而影响土壤有机碳(SOC)的积累与损耗过程。过去研究集中在温度和降水等影响因素对土壤碳转化过程和碳储量动态等的影响,较少关注地下水位波动引起的变化,尤其缺乏在不同生态系统中地下水位变化后植物根系-微生物-SOC交互作用对土壤碳循环影响的研究。基于此,结合近年国内外土壤碳周转过程相关研究,总结地下水位变化对根系碳分配、微生物群落碳代谢以及土壤呼吸的影响,进一步探讨地下水位与土壤碳循环的动态关系;同时对比研究了地下水位变化后不同生态系统类型土壤有机碳的变化规律。研究将有助于揭示地下水位变化对土壤碳循环动态的调控机制,利于阐明未确定的陆地碳储量,完善陆地生态系统碳循环模型,为应对全球变化提供科学的理论基础。
中图分类号:
苏天燕, 刘文杰, 杨秋, 毛伟. 土壤碳循环对地下水位的响应研究进展[J]. 中国沙漠, 2020, 40(5): 180-189.
Tianyan Su, Wenjie Liu, Qiu Yang, Wei Mao. Review on response of soil carbon cycle to groundwater level change[J]. Journal of Desert Research, 2020, 40(5): 180-189.
陆地生态系统类型 | 土壤碳动态变化 | 文献 |
---|---|---|
草地 | 地下水位与土壤有机碳呈负相关关系 | [ |
地下水位增加,可利用性氧增加,土壤有机质的分解速率增大 | [ | |
湿地 | 地下水位下降使土壤固碳能力下降 | [ |
长期水淹状态下会加快有机质的循环转化过程 | [ | |
长期水淹会缓解有机质的分解和矿化速率,利于有机质积累 | [ | |
长期退水状态会加快有机质分解和矿化速率,增加碳排放 | [ | |
农田 | 淹水处理下碳分解速率大于旱地处理,加快SOC矿化过程 | [ |
淹水处理下大量CH4、CO2排放,好气处理下大量N2O排放 | [ | |
SOC矿化速率和积累速率在淹水条件下比在好气条件下高 | [ |
表1 地下水位对不同类型陆地生态系统土壤碳的影响
Table 1 Effects of groundwater depth on soil carbon in different terrestrial ecosystems
陆地生态系统类型 | 土壤碳动态变化 | 文献 |
---|---|---|
草地 | 地下水位与土壤有机碳呈负相关关系 | [ |
地下水位增加,可利用性氧增加,土壤有机质的分解速率增大 | [ | |
湿地 | 地下水位下降使土壤固碳能力下降 | [ |
长期水淹状态下会加快有机质的循环转化过程 | [ | |
长期水淹会缓解有机质的分解和矿化速率,利于有机质积累 | [ | |
长期退水状态会加快有机质分解和矿化速率,增加碳排放 | [ | |
农田 | 淹水处理下碳分解速率大于旱地处理,加快SOC矿化过程 | [ |
淹水处理下大量CH4、CO2排放,好气处理下大量N2O排放 | [ | |
SOC矿化速率和积累速率在淹水条件下比在好气条件下高 | [ |
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