China's wetland soil organic carbon pool: New estimation on pool size, change, and trajectory

湿地 土壤碳 环境科学 地理空间分析 中国 水文学(农业) 总有机碳 土壤科学 自然地理学 生态学 遥感 土壤水分 地理 地质学 生物 考古 岩土工程
作者
Yongxing Ren,Dehua Mao,Zongming Wang,Zicheng Yu,Xiaofeng Xu,Yanan Huang,Yanbiao Xi,Ling Luo,Mingming Jia,Kaishan Song,Xiaoyan Li
出处
期刊:Global Change Biology [Wiley]
卷期号:29 (21): 6139-6156 被引量:34
标识
DOI:10.1111/gcb.16923
摘要

Abstract Robust estimates of wetland soil organic carbon (SOC) pools are critical to understanding wetland carbon dynamics in the global carbon cycle. However, previous estimates were highly variable and uncertain, due likely to the data sources and method used. Here we used machine learning method to estimate SOC storage and their changes over time in China's wetlands based on wetland SOC density database, associated geospatial environmental data, and recently published wetland maps. We built a database of wetland SOC density in China that contains 809 samples from 181 published studies collected over the last 20 years as presented in the published literature. All samples were extended and standardized to a 1‐m depth, on the basis of the relationship between SOC density data from soil profiles of different depths. We used three different machine learning methods to evaluate their robustness in estimating wetland SOC storage and changes in China. The results indicated that random forest model achieved accurate wetland SOC estimation with R 2 being .65. The results showed that average SOC density of top 1 m in China's wetlands was 25.03 ± 3.11 kg C m −2 in 2000 and 26.57 ± 3.73 kg C m −2 in 2020, an increase of 6.15%. SOC storage change from 4.73 ± 0.58 Pg in 2000 to 4.35 ± 0.61 Pg in 2020, a decrease of 8.03%, due to 13.6% decreased in wetland area from 189.12 × 10 3 to 162.8 × 10 3 km 2 in 2020, despite the increase in SOC density during the same time period. The carbon accumulation rate was 107.5 ± 12.4 g C m −2 year −1 since 2000 in wetlands with no area changes. Climate change caused variations in wetland SOC density, and a future warming and drying climate would lead to decreases in wetland SOC storage. Estimates under Shared Socioeconomic Pathway 1‐2.6 (low‐carbon emissions) suggested that wetland SOC storage in China would not change significantly by 2100, but under Shared Socioeconomic Pathway 5‐8.5 (high‐carbon emissions), it would decrease significantly by approximately 5.77%. In this study, estimates of wetland SOC storage were optimized from three aspects, including sample database, wetland extent, and estimation method. Our study indicates the importance of using consistent SOC density and extent data in estimating and projecting wetland SOC storage.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
drwang发布了新的文献求助10
刚刚
居居子完成签到,获得积分10
2秒前
开心榴莲大王完成签到 ,获得积分10
3秒前
搞怪小霜发布了新的文献求助60
5秒前
ll应助灵巧青槐采纳,获得10
5秒前
大个应助执着的绿柏采纳,获得30
5秒前
6秒前
7秒前
7秒前
43发布了新的文献求助10
7秒前
8秒前
不安的采白完成签到,获得积分10
8秒前
8秒前
聪慧小霜应助heyujie采纳,获得10
8秒前
drwang完成签到,获得积分10
9秒前
taenggu9发布了新的文献求助20
10秒前
林宥嘉发布了新的文献求助10
10秒前
我是老大应助凯旋预言采纳,获得10
10秒前
小马甲应助空山新雨采纳,获得10
13秒前
李玢琪完成签到 ,获得积分10
13秒前
Hcristiano发布了新的文献求助10
13秒前
Orange应助陆家麟采纳,获得10
14秒前
安徒完成签到,获得积分10
16秒前
桐桐应助木木木采纳,获得10
17秒前
无奈的盼望完成签到 ,获得积分10
17秒前
陈一博发布了新的文献求助10
17秒前
19秒前
江桥完成签到,获得积分10
19秒前
Ava应助安徒采纳,获得10
19秒前
20秒前
20秒前
Misty_发布了新的文献求助10
22秒前
22秒前
23秒前
zhangscience发布了新的文献求助10
24秒前
25秒前
凉初透发布了新的文献求助50
25秒前
慕子默完成签到,获得积分10
27秒前
27秒前
27秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Immigrant Incorporation in East Asian Democracies 600
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Picture Books with Same-sex Parented Families: Unintentional Censorship 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3972334
求助须知:如何正确求助?哪些是违规求助? 3516836
关于积分的说明 11184871
捐赠科研通 3252297
什么是DOI,文献DOI怎么找? 1796357
邀请新用户注册赠送积分活动 876339
科研通“疑难数据库(出版商)”最低求助积分说明 805488