黄土丘陵沟壑区梯田的碳汇作用及其变化特征

喻恺阳; 成辉; 李智广; 张晓萍; 冯浩; 马红斌; 白云斌

doi:10.13961/j.cnki.stbctb.2024.05.031

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黄土丘陵沟壑区梯田的碳汇作用及其变化特征

试验研究

- 黄土丘陵沟壑区梯田的碳汇作用及其变化特征
- Functions and Characteristics of Terrace Carbon Sinks in Loess Hilly and Gully Regions
- 水土保持通报 2024年43卷第5期页码：287-293
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌,712100
  2. 水利部水土保持监测中心,北京,100053
  3. 中国科学院教育部水土保持与生态环境研究中心, 陕西杨凌,712100
  4. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
  5. 黄河流域水土保持生态环境监测中心,陕西,西安,710021
  6. 延安市吴起县吴起镇林业站,陕西,延安,717600
- 作者简介：
- 基金信息：
  
  “政府间国际科技创新合作”国家重点研发计划项目“中欧典型农业系统退化土壤修复管理创新研究平台”(2022YFE0115300)
- DOI：10.13961/j.cnki.stbctb.2024.05.031
  中图分类号： S157.3
- 纸质出版：2024
- 稿件说明：
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喻恺阳, 成辉, 李智广, 等. 黄土丘陵沟壑区梯田的碳汇作用及其变化特征[J]. 水土保持通报, 2024,43(5):287-293.

Yu Kaiyang, Cheng Hui, Li Zhiguang, et al. Functions and Characteristics of Terrace Carbon Sinks in Loess Hilly and Gully Regions[J]. Bulletin of Soiland Water Conservation, 2024, 43(5): 287-293.
喻恺阳, 成辉, 李智广, 等. 黄土丘陵沟壑区梯田的碳汇作用及其变化特征[J]. 水土保持通报, 2024,43(5):287-293. DOI： 10.13961/j.cnki.stbctb.2024.05.031.

Yu Kaiyang, Cheng Hui, Li Zhiguang, et al. Functions and Characteristics of Terrace Carbon Sinks in Loess Hilly and Gully Regions[J]. Bulletin of Soiland Water Conservation, 2024, 43(5): 287-293. DOI： 10.13961/j.cnki.stbctb.2024.05.031.

摘要

[目的

]

定量分析和探讨梯田碳汇作用与其特征，为明确梯田的碳汇作用、巩固和提升生态系统碳汇能力、研编梯田碳汇方法学等提供科学参考。[方法

]

选取黄土丘陵沟壑区的陕西省吴起县1～7 a(T

)，8～12 a(T

)，13～17 a(T

)，18～22 a(T

)，23～27 a(T

)这5个年份区间的梯田作为研究对象，以未实施水土保持措施的坡耕地为对照，研究不同年份梯田保碳、减排、增汇等能力与其变化规律。[结果

]

①坡耕地修建为梯田后可发挥保碳、减排、增汇等碳汇作用，梯田年均保碳量、减排量、增汇量(0—100 cm)分别为0.26，0.05，1.36 t/(hm

·a)。②梯田各土层均发挥了一定的增汇效益，表层土壤(0—40 cm)和深层土壤(40—100 cm)增汇效益分别占0—100 cm整个土层的61.50%和38.50%。③随着运行年份的增加，梯田表层土壤增汇效益显著增加，深层土壤的增汇效益稍有提升但总体上保持平稳。表层土壤增汇率从T

的16.30%提升至T

的51.34%，深层土壤从T

的14.00%提升至T

的23.66%。[结论

]

黄土丘陵沟壑区梯田发挥着良好的保土保碳、减蚀减排和土壤增汇等碳汇作用。在修建27 a内，梯田增汇作用的比例最大，且表层土壤增汇更为显著；随着运行年份增加，梯田保碳作用的比例将逐渐增大。

Abstract

[Objective] The carbon sink function of terraces and their characteristics were analyzed and discussed to provide a scientific reference for clarifying the carbon sink function

consolidating and enhancing the carbon sink capacity of ecosystems

and researching and compiling a carbon sink methodology for terraces. [Methods] Terraces with the operational ages of 1—7 a (T5)

8—12 a (T10)

13—17 a (T15)

18—22 a (T20)

and 23—27 a (T25) were selected at Wuqi County

Shaanxi Province in the loess hilly and gully region. Slope croplands without soil and water conservation measures were selected for baseline comparison to study the capabilities of terraces in terms of carbon preservation

emission reduction

and carbon sequestration across different years. [Results] ① After the transformation of sloped croplands into terraces

an increase was observed in carbon preservation

emission reduction

and carbon sequestration. Annual carbon preservation

emission reduction

and carbon sequestration (0—100 cm) were 0.26

0.05 and 1.36 t/hm2 respectively. ② Each soil layer of the terraces contributed certain benefits; the carbon sequestration benefits of the surface (0—40 cm) and deep (40—100 cm) soil layers accounted for 61.50% and 38.50% of the entire soil layer

respectively. ③ The benefits of the terrace surface soil significantly increased with the increase in the operation year of the terrace

while the benefits of deep soil were slightly improved but remained stable on the whole. The rate of carbon sequestration in the surface soil increased from 16.30% at T5 to 51.34% at T25 and that in the deep soil increased from 14.00% at T5 to 23.66% at T25. [Conclusion] The terraces in the loess hilly and gully regions exhibited significant carbon sink functions

including carbon preservation

emission reduction

and carbon sequestration. The proportion of carbon sequestration capacity was the largest within 27 years of terrace operation

and the increase in the surface soil was more significant. The proportion of carbon preservation in the carbon sink capacity of terraces gradually increases with an increase in terrace operation years.

关键词

Keywords

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