Effects of Soil and Water Loss on Reservoir Carbon Sink in Karst Watersheds

Wang Cui; Zhou Zhongfa; Li Yongliu; Zhang Yongrong

doi:10.13961/j.cnki.stbctb.2021.06.001

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Effects of Soil and Water Loss on Reservoir Carbon Sink in Karst Watersheds

- Effects of Soil and Water Loss on Reservoir Carbon Sink in Karst Watersheds
- Bulletin of Soiland Water Conservation Vol. 41, Issue 6, Pages: 1-7(2021)
- 作者机构：
  
  1. 贵州师范大学地理与环境科学学院/喀斯特研究院,贵州,贵阳,550001
  2. 贵州省喀斯特山地生态环境国家重点实验室培育基地,贵州,贵阳,550001
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2021.06.001
  CLC： P592;P641.3
- Published：2021
- 稿件说明：
移动端阅览
Wang Cui, Zhou Zhongfa, Li Yongliu, et al. Effects of Soil and Water Loss on Reservoir Carbon Sink in Karst Watersheds[J]. Bulletin of Soiland Water Conservation, 2021, 41(6): 1-7.
DOI：

Wang Cui, Zhou Zhongfa, Li Yongliu, et al. Effects of Soil and Water Loss on Reservoir Carbon Sink in Karst Watersheds[J]. Bulletin of Soiland Water Conservation, 2021, 41(6): 1-7. DOI： 10.13961/j.cnki.stbctb.2021.06.001.

摘要

[目的

]

研究喀斯特流域水土流失对水库碳汇的影响，为区域水土流失治理和科学评估喀斯特地区河流生态系统碳循环提供科学依据。[方法

]

基于纳雍河2014—2018年水文数据和其下游平寨水库流域2017—2018年水化学监测数据，利用回归分析、相关分析、水化学分析方法，研究水土流失对水库碳汇的影响。[结果

]

①2014—2018年，干流纳雍河流量1.15×10

～1.66×10

/a，泥沙通量2.54×10

～1.23×10

t/a。泥沙通量和流量在年际间无相关性，在月时间尺度上呈极显著正相关，短时强降雨是流域发生水土流失的主要原因之一，流域内春夏季水土流失剧烈，秋冬季减弱。②平寨水库Ca

和HCO

为主要阴阳离子，来源于碳酸盐岩风化。SO

是第二大阴离子，参与水库30.30%～59.70%的碳酸盐岩风化，水库水化学类型秋冬季为HCO

-Ca型，春夏季主要为HCO

-SO

-Ca型。③平寨水库水库二氧化碳分压具有时空异质性，表现为：冬季>秋季>春季>夏季，秋冬季为碳源，春夏季为碳汇。[结论

]

平寨水库流域水土流失与水库碳汇效应具有相同的周期性季节变化，水土流失影响水库水化学组成，减弱水库碳汇效应。

Abstract

[Objective] The impacts of soil erosion on reservoir carbon sinks in karst watersheds were studied

in order to provide scientific basis for regional soil erosion control and scientific assessment of carbon cycle in river ecosystems in karst areas.[Methods] Based on hydrological data of Nayong River from 2014 to 2018 and water chemistry monitoring data of Pingzhai Reservoir at the downstream from 2017 to 2018

regression analysis

correlation analysis

and water chemistry analysis were used to study the effects of soil erosion on reservoir carbon sinks.[Results] ① During period from 2014 to 2018

the flow of the Nayong River ranged from 1.151 to 1.663 billion m3/a

and sediment flux ranged from 25.36 to 1.224 7 million t/a. Sediment flux and water flow were not correlated between years but showed a highly significant positive correlation on the monthly time scale. The short-time intense rainfall was one of the main reasons for the occurrence of soil erosion in the watershed. The erosion was intense in spring and summer and weak in autumn and winter. ② Ca2+ and HCO3- were the main anions in Pingzhai Reservoir

which came from carbonate rock weathering. SO42- was the second most important anion

participating in 30.30%~59.70% of carbonate rock weathering in the reservoir. Reservoir water chemistry type was HCO3--Ca type in autumn and winter

and mainly HCO3--SO42--Ca type in spring and summer. ③ The partial pressure of carbon dioxide in the reservoir of Pingzhai Reservoir showed spatial and temporal heterogeneity as:winter > autumn > spring > summer

which were showed as carbon sources during autumn and winter

and as carbon sinks while spring and summer.[Conclusion] Soil erosion and reservoir carbon sink effect in Pingzhai Reservoir basin have the same periodic seasonal changes

soil erosion affects reservoir water chemistry and weakens reservoir carbon sink effect.

关键词

Keywords

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