摘要
以高产粮区河北省曲周县为例 ,运用生物地球化学循环模型—DNDC模型 ,在实测田间试验数据进行模型验证的基础上 ,对该地区农业生态系统土壤碳氮平衡进行了模拟研究。结果表明 :1998年曲周县 4 782 1hm2 农业耕地土壤的总有机碳储量为C 74 2 .94× 10 6kg ,平均每公顷耕地土壤有机碳 (SOC)储量为C 15 5 36 .0 5kg。 1998年耕地土壤有机碳为正平衡 ,1990年为负平衡 ,2年SOC显著差异的主要原因在于秸秆还田比例的多少。 1998年曲周县农业土壤氮库表现为盈余。土壤有机碳的长期模拟动态表明与当前管理相比 ,增加有机肥和秸秆还田比例、采用免耕均可有效的增加土壤有机碳的积累。
As a typical example of high grain production region, the carbon and nitrogen cyclings of agro-ecolsystem were studied with DNDC(DeNitrification-DeComposition)model in Quzhou county of Hebei province. The results showed that the total organic carbon storage was 7.43×108 kg in 47 821 hm2 farm land of Quzhou county. The average SOC (soil organic carbon) storage per hectare was 1.55×105 kg in 1998. Soil organic carbon was at positive balance in 1998, but at negative balance in 1990 because of reduction of straw addition to the soil in 1990. The soil nitrogen pool was in surplus situation in 1998 in Quzhou county. The long-time dynamic simulation of SOC showed that: SOC can be increased depending on higher manure, higher proportions of straw returning and no tillage comparing with current management.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
2003年第z1期31-35,共5页
Journal of China Agricultural University
