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Carbon Addition Modified the Response of Heterotrophic Respiration to Soil Sieving in Ectomycorrhizal-Dominated Forests
| Content Provider | MDPI |
|---|---|
| Author | Zheng, Sijia Zhao, Xuechao Sun, Zhaolin Li, Jing Jing, Yanli Wang, Qing Kui |
| Copyright Year | 2022 |
| Description | Soil heterotrophic respiration $(R_{h}$) is an important pathway of carbon (C) dioxide release from terrestrial soils to the atmosphere. It is often measured using sieved soil in a laboratory, but the uncertainty of how it is influenced by soil sieving persists, which limits the accuracy of predicting soil organic C dynamics in C models. To address how soil sieving during laboratory incubation affects $R_{h}$ and its response to increased carbon availability, we investigated $R_{h}$ in sieved and intact soil cores and its response to$ ^{13}$C-glucose addition. This was conducted through a 27-day laboratory incubation in four forests, including two ectomycorrhizal-dominated (ECM) forests and two arbuscular mycorrhizal-dominated forests. The significant influence of soil sieving on $R_{h}$ in all forests was not observed during incubation when glucose was not added. After adding glucose, the $R_{h}$ in the sieved soils on the 5th day of incubation was averaged 27.2% lower than that in intact soils in ECM forests. On the 27th day it was 22.1% lower in the Pinus massoniana forest, but 78.0% higher in the Castanea mollissima forest. Strong relationships were detected between $R_{h}$ in sieved and intact soils $(r^{2}$ = 0.888), and in soils both with and without the addition of glucose $(r^{2}$ = 0.827). The measured soil variables explained 74.7% and 49.7% of the variation in $R_{h}$ on the 5th and 27th day of incubation, and the role of soil nutrients and microbial PLFA groups in regulating $R_{h}$ varied temporally. Our findings suggest that plant mycorrhizal types influenced the role of increased C availability to microbes in regulating the response of $R_{h}$ to sieving in forest ecosystems. |
| Starting Page | 1263 |
| e-ISSN | 19994907 |
| DOI | 10.3390/f13081263 |
| Journal | Forests |
| Issue Number | 8 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-08-10 |
| Access Restriction | Open |
| Subject Keyword | Forests Soil Science Soil Heterotrophic Respiration Soil Sieving Intact Soil Core Carbon Sequestration Microbial Community Plant Functional Type |
| Content Type | Text |
| Resource Type | Article |
