Acosta Jose A, Imbernón-Mulero Alberto, Gallego-Elvira Belén, Maestre-Valero Jose F, Martínez-Martínez Silvia, Martínez-Álvarez Victoriano
Department of Agricultural Engineering, Technical University of Cartagena, Paseo Alfonso XIII 48, 30203 Cartagena, Spain.
Plants (Basel). 2024 Aug 28;13(17):2399. doi: 10.3390/plants13172399.
Agroecological ecosystems produce significant carbon dioxide fluxes; however, the equilibrium of their carbon sequestration, as well as emission rates, faces considerable uncertainties. Therefore, sustainable cropping practices represent a unique opportunity for carbon sequestration, compensating greenhouse gas emissions. In this research, we evaluated the short-term effect of different management practices in alleys (tillage, no tillage, alley cropping with and on soil properties, carbon sequestration, and CO emissions in a grapefruit orchard under semiarid climate). For two years every four months, soil sampling campaigns were performed, soil CO emissions were measured, and rhizosphere soils were sampled at the end of the experimental period. The results show that alley cropping with and contributed to improve soil fertility, increasing soil organic carbon (SOC), total nitrogen, cation exchange capacity, and nutrients. The CO emission rates followed the soil temperature/moisture pattern. Tillage did not contribute to higher overall CO emissions, and there were no decreased SOC contents. In contrast, alley crops increased CO emission rates, especially ; however, the bigger root system and biomass of contributed to soil carbon sequestration at a greater rate than . Therefore, is positioned as a better option than to be used as an alley crop, although long-term monitoring is required to evaluate if the reported short-term benefits are maintained over time.
农业生态系统会产生大量的二氧化碳通量；然而，其碳固存的平衡以及排放速率面临着相当大的不确定性。因此，可持续种植实践是碳固存的独特机遇，可补偿温室气体排放。在本研究中，我们评估了不同管理措施（耕作、免耕、种植 和 ）对半干旱气候下柚子园土壤性质、碳固存及二氧化碳排放的短期影响。连续两年，每四个月进行一次土壤采样活动，测量土壤二氧化碳排放量，并在试验期结束时采集根际土壤样本。结果表明，种植 和 有助于提高土壤肥力，增加土壤有机碳（SOC）、全氮、阳离子交换容量和养分。二氧化碳排放速率遵循土壤温度/湿度模式。耕作并未导致总体二氧化碳排放量增加，土壤有机碳含量也未降低。相比之下，间作作物增加了二氧化碳排放速率，尤其是 ；然而， 的更大根系和生物量比 以更高的速率促进了土壤碳固存。因此，尽管需要长期监测以评估所报告的短期效益是否能长期维持，但 作为间作作物比 是更好的选择。
