内蒙古克氏针茅草原净生态系统碳交换的物候特征及遥感监测

doi:10.13287/j.1001-9332.202403.025

应用生态学报 ›› 2024, Vol. 35 ›› Issue (3): 659-668.doi: 10.13287/j.1001-9332.202403.025

内蒙古克氏针茅草原净生态系统碳交换的物候特征及遥感监测

王进¹, 周广胜^2,3,4*, 何奇瑾^1,3,4, 周莉^2,4

¹中国农业大学资源与环境学院, 北京 100193;
²中国气象科学研究院, 灾害天气国家重点实验室/河北固城农业气象国家野外科学观测研究站, 北京 100081;
³南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044;
⁴中国气象局-中国农业大学农业应对气候变化联合实验室, 北京 100081

收稿日期:2023-09-18 修回日期:2024-01-19 出版日期:2024-03-18 发布日期:2024-06-18
通讯作者: *E-mail: zhougs@cma.gov.cn
作者简介:王进, 男, 1997年生, 硕士研究生。主要从事植被物候遥感监测研究。E-mail: wang.rw@cau.edu.cn
基金资助:
国家自然科学基金项目(42130514,42141007)

Phenological characteristics of net ecosystem carbon exchange of Stipa krylovii steppe in Inner Mongolia, China and its remote sensing monitoring

WANG Jin¹, ZHOU Guangsheng^2,3,4*, HE Qijin^1,3,4, ZHOU Li^2,4

¹College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;
²Hebei Gucheng Agricultural Meteorology National Observation and Research Station/State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;
³Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Techno-logy, Nanjing 210044, China;
⁴CMA-CAU Jointly Laboratory of Agriculture Addressing Climate Change, Beijing 100081, China

Received:2023-09-18 Revised:2024-01-19 Online:2024-03-18 Published:2024-06-18

摘要/Abstract

摘要： 为准确遥感监测草原净生态系统碳交换(NEE)物候,利用内蒙古锡林浩特国家气候观象台2018—2021年的涡度相关系统和气象梯度观测系统观测数据,结合2018年1月1日至2021年12月31日的Sentinel-2卫星数据,分析克氏针茅草原NEE及其物候的变化规律,并探讨了NEE物候的遥感植被指数及阈值。结果表明: 2018—2021年,研究区NEE呈季节性变化,4—10月为碳汇,其他月份为碳源,总体呈碳汇。碳吸收开始日期(SCUP)和结束日期(ECUP)的平均儒略日分别为第95天和第259天,碳吸收持续时间平均为165 d。光合有效辐射与日NEE呈极显著负相关,有助于草原生态系统吸收大气中CO₂。最佳阈值10%的红边叶绿素指数能够较好地捕捉SCUP,而最佳阈值75%的归一化植被指数则能较好地反映ECUP。研究结果可为草原生态系统碳源汇的遥感监测提供依据。

关键词: 克氏针茅草原, 净生态系统碳交换, 物候, 遥感监测, 内蒙古

Abstract: To accurately monitor the phenology of net ecosystem carbon exchange (NEE) in grasslands with remote sensing, we analyzed the variations in NEE and its phenology in the Stipa krylovii steppe and discussed the remote sensing vegetation index thresholds for NEE phenology, with the observational data from the Inner Mongolia Xilinhot National Climate Observatory’s eddy covariance system and meteorological gradient observation system during 2018-2021, as well as Sentinel-2 satellite data from January 1, 2018 to December 31, 2021. Results showed that, from 2018 to 2021, NEE exhibited seasonal variations, with carbon sequestration occurring from April to October and carbon emission in other months, resulting in an overall carbon sink. The average Julian days for the start date (SCUP) and the end date (ECUP) of carbon uptake period were the 95^th and 259^th days, respectively, with an average carbon uptake period lasting 165 days. Photosynthetically active radiation showed a negative correlation with daily NEE, contributing to carbon absorption of grasslands. The optimal threshold for capturing SCUP was a 10% threshold of the red-edge chlorophyll index, while the normalized difference vegetation index effectively reflected ECUP with a threshold of 75%. These findings would provide a basis for remote sensing monitoring of grassland carbon source-sink dynamics.

Key words: Stipa krylovii steppe, net ecosystem carbon exchange, phenology, remote sensing monitoring, Inner Mongolia

王进, 周广胜, 何奇瑾, 周莉. 内蒙古克氏针茅草原净生态系统碳交换的物候特征及遥感监测[J]. 应用生态学报, 2024, 35(3): 659-668.

WANG Jin, ZHOU Guangsheng, HE Qijin, ZHOU Li. Phenological characteristics of net ecosystem carbon exchange of Stipa krylovii steppe in Inner Mongolia, China and its remote sensing monitoring[J]. Chinese Journal of Applied Ecology, 2024, 35(3): 659-668.

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内蒙古克氏针茅草原净生态系统碳交换的物候特征及遥感监测

Phenological characteristics of net ecosystem carbon exchange of Stipa krylovii steppe in Inner Mongolia, China and its remote sensing monitoring

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