耕地面积占世界陆地总面积的10%,但是从农业系统中进入大气的碳流,据估计,占到从陆地生态系统和腐水池中进入大气的碳流的纯损失量的40%。由于年生或季生作物,与其单种特征联系起来看,其生命周期相对较短,而且这些作物通常还要吸收肥料养分和其他改良土壤的物质,因而农业生态系统中的净产量能够达到最大值.但是,在农业生态系统中的土壤含碳量比自然界中的含碳量要低得多。在传统的农业方法中,耕 The area of ​​arable land accounts for 10% of the total land area of ​​the world, but the carbon flux into the atmosphere from agricultural systems is estimated to account for 40% of the net loss of carbon flows into the atmosphere from terrestrial ecosystems and from saprophytes. As annual or seasonal crops are associated with their single traits, their life cycle is relatively short, and these crops often have to absorb nutrients from fertilizers and other soil-modifying substances, so that net yields in agro-ecosystems can reach their maximum However, soil carbon in agricultural ecosystems is much lower than in nature. In traditional farming methods, farming