| Autor: |
Moreira, Elwira Daphinn Silva, Oliveira, Alan Figueiredo de, Santos, Claudinei Alves dos, Gonçalves, Lúcio Carlos, Viana, Maria Celuta Machado, Marriel, Ivanildo Evódio, Gontijo Neto, Miguel Marques, Alvarenga, Ramon Costa, Lana, Ângela Maria Quintão |
| Zdroj: |
Soil Research; 2022, Vol. 60 Issue: 7 p705-718, 14p |
| Abstrakt: |
Context There is little information on the effects of tree densities and ages of silvopastoral systems (SSPs) on total soil carbon stock (TSCS). Aims This study aimed to evaluate the TSCS, carbon and nitrogen fractionation and biological activity in SSPs planted with Eucalyptus grandis in different densities and ages. Methods Two SSPs (333 or 166treesha−1 ) and one full sun pasture (FSP) grown for 5 or 7years and native vegetation (NV) were evaluated (seven treatments). Samples were collected up to 1m deep to evaluate the variables. Key results Particulate organic carbon (POC) and particulate organic nitrogen (PON) were higher (P −1 ), intermediate in SSP (9.88 and 0.46gkg−1 ) and lower in NV (6.12 and 0.29gkg−1 ). TSCS was 44.8% (194 vs 134Mgha−1 ; P −1 ; P =0.026), POC was 52.0% (11.9 vs 7.83gkg−1 ; P −1 ; P Conclusions Tree density had a limited effect on TSCS. Higher SSP age increased carbon sequestration, probably due to greater cycling in the particulate fraction and better biological activity. Implications The SSP and well-managed FSP are good strategies to increase TSCS compared to NV, and their use can improve environmental indicators. |
| Databáze: |
Supplemental Index |
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