Academic Journal

Interannual characteristics and driving mechanism of CO2 fluxes during the growing season in an alpine wetland ecosystem at the southern foot of the Qilian Mountains

التفاصيل البيبلوغرافية
العنوان: Interannual characteristics and driving mechanism of CO2 fluxes during the growing season in an alpine wetland ecosystem at the southern foot of the Qilian Mountains
المؤلفون: Jingbin Zhu, Hongqin Li, Huidan He, Fawei Zhang, Yongsheng Yang, Yingnian Li
المصدر: Frontiers in Plant Science, Vol 13 (2022)
بيانات النشر: Frontiers Media S.A., 2022.
سنة النشر: 2022
المجموعة: LCC:Plant culture
مصطلحات موضوعية: Alpine wetland, CO2 fluxes, growing season, driving mechanism, Qinghai–Tibetan plateau, Plant culture, SB1-1110
الوصف: The carbon process of the alpine ecosystem is complex and sensitive in the face of continuous global warming. However, the long-term dynamics of carbon budget and its driving mechanism of alpine ecosystem remain unclear. Using the eddy covariance (EC) technique—a fast and direct method of measuring carbon dioxide (CO2) fluxes, we analyzed the dynamics of CO2 fluxes and their driving mechanism in an alpine wetland in the northeastern Qinghai–Tibet Plateau (QTP) during the growing season (May–September) from 2004–2016. The results show that the monthly gross primary productivity (GPP) and ecosystem respiration (Re) showed a unimodal pattern, and the monthly net ecosystem CO2 exchange (NEE) showed a V-shaped trend. With the alpine wetland ecosystem being a carbon sink during the growing season, that is, a reservoir that absorbs more atmospheric carbon than it releases, the annual NEE, GPP, and Re reached −67.5 ± 10.2, 473.4 ± 19.1, and 405.9 ± 8.9 gCm-2, respectively. At the monthly scale, the classification and regression tree (CART) analysis revealed air temperature (Ta) to be the main determinant of variations in the monthly NEE and GPP. Soil temperature (Ts) largely determined the changes in the monthly Re. The linear regression analysis confirmed that thermal conditions (Ta, Ts) were crucial determinants of the dynamics of monthly CO2 fluxes during the growing season. At the interannual scale, the variations of CO2 fluxes were affected mainly by precipitation and thermal conditions. The annual GPP and Re were positively correlated with Ta and Ts, and were negatively correlated with precipitation. However, hydrothermal conditions (Ta, Ts, and precipitation) had no significant effect on annual NEE. Our results indicated that climate warming would be beneficial to the improvement of GPP and Re in the alpine wetland, while the increase of precipitation can weaken this effect.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1664-462X
Relation: https://www.frontiersin.org/articles/10.3389/fpls.2022.1013812/full; https://doaj.org/toc/1664-462X
DOI: 10.3389/fpls.2022.1013812
URL الوصول: https://doaj.org/article/09013ddd434c4af3b0b27b1972618a6e
رقم الانضمام: edsdoj.09013ddd434c4af3b0b27b1972618a6e
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:1664462X
DOI:10.3389/fpls.2022.1013812