Net Negative Global Warming Potential By Nutrient Management In Arid Cropland In China

Soil organic carbon is generally very low in arid and extremely arid areas due to harsh environmental conditions and low precipitation. However, human management can alter the soil profile, making it more hospital for growth and increasing soil carbon in the process. In arid agriculture in China this human management includes drip irrigation, mulch filming and integration with animal agriculture. Research has shown lower greenhouse gas emissions from arid croplands compared to other climatic conditions. Between lower greenhouse gas emissions and potential for increased soil carbon sequestration due to improved environmental conditions, arid croplands present one of the ecosystems with the greatest potential global cooling effects.由于环境条件严苛、降水量稀少，干旱及极端干旱地区的土壤有机碳含量普遍极低。然而人类经营管理活动可改变土壤剖面结构，使其更适宜作物生长，并在此过程中提升土壤碳储量。在中国的旱作农业中，这类人为管理措施包括滴灌、地膜覆盖以及与畜牧养殖业的结合。研究表明，与其他气候区农田相比，干旱农田的温室气体排放量更低。综合更低的温室气体排放与环境条件改善带来的土壤碳封存潜力提升，干旱农田成为全球范围内具备最强冷却效应潜力的生态系统之一。