Grossi Giampiero, Vitali Andrea, Lacetera Nicola, Danieli Pier Paolo, Bernabucci Umberto, Nardone Alessandro
Department of Agricultural and Forestry Sciences (DAFNE), University of Tuscia, 01100 Viterbo, Italy.
Animals (Basel). 2020 Mar 2;10(3):415. doi: 10.3390/ani10030415.
A better understanding of soil organic carbon (SOC) dynamics is needed when assessing the carbon footprint (CFP) of livestock products and the effectiveness of possible agriculture mitigation strategies. This study aimed (i) to perform a cradle-to-gate CFP of pasture-based beef cattle in a Mediterranean agropastoral system (ii) and to assess the effects on the CFP of alternative tillage, fertilizing, and grazing practices under current (NCC) and future climate change (CC) scenarios. Minimum (Mt) and no-tillage (Nt) practices were compared to current tillage (Ct); a 50% increase (Hf) and decrease (Lf) in fertilization was evaluated against the current (Cf) rate; and rotational grazing (Rg) was evaluated versus the current continuous grazing (Cg) system. The denitrification-decomposition (DNDC) model was run using NCC as well as representative concentration pathways to investigate the effects of farm management practices coupled with future CC scenarios on SOC dynamics, NO fluxes, and crop yield. Within NCC and CtCf, an emission intensity of 26.9 ± 0.7 kg CO per kg live body weight was estimated. Compared to Ct, the adoption of Mt and Nt reduced the CFP by 20% and 35%, respectively, while NtHf reduced it by 40%. Conservation tillage practices were thus shown to be effective in mitigating greenhouse gas emissions.
在评估畜产品的碳足迹（CFP）以及可能的农业减排策略的有效性时，需要更好地了解土壤有机碳（SOC）动态。本研究旨在：（i）对地中海农牧系统中以牧场为基础的肉牛进行从摇篮到大门的CFP评估；（ii）评估在当前（NCC）和未来气候变化（CC）情景下，替代耕作、施肥和放牧方式对CFP的影响。将最小耕作（Mt）和免耕（Nt）方式与当前耕作（Ct）进行比较；评估施肥量相对于当前（Cf）增加50%（Hf）和减少50%（Lf）的情况；并将轮牧（Rg）与当前的连续放牧（Cg）系统进行比较。利用NCC以及代表性浓度路径运行反硝化-分解（DNDC）模型，以研究农场管理措施与未来CC情景相结合对SOC动态、NO通量和作物产量的影响。在NCC和CtCf范围内，估计每千克活体重的排放强度为26.9±0.7千克CO。与Ct相比，采用Mt和Nt分别使CFP降低了20%和35%，而NtHf使其降低了40%。因此，保护性耕作措施在减轻温室气体排放方面被证明是有效的。
