农田土壤有机碳管理与有机质平衡算法

张维理,KOLBEH,张认连,冀宏杰

Soil Organic Carbon Management and Farmland Organic Matter Balance Method

WeiLi ZHANG,H KOLBE,RenLian ZHANG,HongJie JI

表5 供综合农业用农田有机质供应状况五等级评价分级指标[9,10]

Table 5 Five grade system for evaluating organic matter supply of farmland in integrated farming system

分级名 Grade 分级释义 Definition 有机质碳当量 Heq Corg kg·hm-2·a-1 评价 Evaluation 推荐 Recommendation A 很低 Very low ＜-200 对土壤肥力和产量有负面影响 Negative influences on soil fertility and yield 改变轮作或增加有机肥用量 Change rotation or increase organic fertilizers B 低 Low -200—-76 中期尚可承受 Medium-term affordable 需要改变轮作或增施有机肥实现平衡 Changing rotation or increasing organic fertilizer to achieve balance C 达到平衡 Balance -75—100 农田投入的有机质量与有机质矿化量达到平衡 Balance between organic matter input to farmland and SOC mineralization achieved 无 No D 高 High 101—300 中期尚可承受 Medium-term affordable 需要改变轮作或减施有机肥实现平衡 Changing rotation or decreasing organic fertilizer to achieve balance E 很高 Very high ＞ 300 有机质矿化量升高导致养分流失和肥料利用率下降 Increased mineralization leads to nutrient loss and fertilizer efficiency decrease 注意避免农田过量用氮 Excessive nitrogen input in farmland should be avoided