| Autor: |
Caitlin E Moore, Christy D Gibson, Guofang Miao, Evan C Dracup, Nuria Gomez-Casanovas, Michael D Masters, Jesse Miller, Adam C von Haden, Tilden Meyers, Evan H DeLucia, Carl J Bernacchi |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Environmental Research Letters, Vol 17, Iss 5, p 054029 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
1748-9326 |
| DOI: |
10.1088/1748-9326/ac661a |
| Popis: |
Understanding agroecosystem carbon (C) cycle response to climate change and management is vital for maintaining their long-term C storage. We demonstrate this importance through an in-depth examination of a ten-year eddy covariance dataset from a corn–corn–soybean crop rotation grown in the Midwest United States. Ten-year average annual net ecosystem exchange (NEE) showed a net C sink of −0.39 Mg C ha ^−1 yr ^−1 . However, NEE in 2014 and 2015 from the corn ecosystem was 3.58 and 2.56 Mg C ha ^−1 yr ^−1 , respectively. Most C loss occurred during the growing season, when photosynthesis should dominate and C fluxes should reflect a net ecosystem gain. Partitioning NEE into gross primary productivity (GPP) and ecosystem respiration (ER) showed this C ‘burp’ was driven by higher ER, with a 51% (2014) and 57% (2015) increase from the ten-year average (15.84 Mg C ha ^−1 yr ^−1 ). GPP was also higher than average (16.24 Mg C ha ^−1 yr ^−1 ) by 25% (2014) and 37% (2015), but this was not enough to offset the C emitted from ER. This increased ER was likely driven by enhanced soil microbial respiration associated with ideal growing season climate, substrate availability, nutrient additions, and a potential legacy effect from drought. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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