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为探讨长期不同施肥条件下土壤有机碳的变化规律及DNDC模型的应用,利用封丘石灰性潮土不同施肥措施下的长期定位试验数据,选取CK、NPK、1/2NPK+1/2OM、OM4个处理,分析了15年来作物产量及土壤有机碳(SOC)的变化特征,并用DNDC模型预测了试验地近100年(2000~2099)的SOC变化趋势。结果表明,各施肥处理的多年产量平均值和对照处理差异显著;施用化肥(NPK和1/2NPK+1/2OM)处理和有机肥(OM)处理间也有显著差异;产量最高为NPK处理,达10811 kg/ha,CK处理最低,但1/2NPK+1/2OM处理产量与NPK处理无显著性差异。15年来土壤耕层(0—20cm)有机碳平均值,以OM处理最高,达到7.90 g/kg,显著高于1/2NPK+1/2OM、NPK处理;而CK处理仅为4.15 g/kg。从15年来有机碳的变化看出,CK处理略有下降,NPK处理较为平稳,而1/2NPK+1/2OM和OM处理呈现不断上升趋势,OM处理上升幅度较1/2NPK+1/2OM处理大。对试验地SOC变化趋势长期(100a)的模拟结果显示,与初始土壤SOC含量相比,100a后不施肥处理(CK)土壤有机碳含量下降了52%,化肥(NPK)处理土壤SOC含量较为稳定,而1/2NPK+1/2OM处理和OM处理土壤有机碳增加明显,大约25a后基本上稳定,100a后分别较2000年增加了24%和25%。从实测数据的分析和DNDC模型模拟分析可以看出,有机肥和化肥配施能获得较高作物产量,并能有效地增加土壤SOC含量,从而提高土壤的可持续利用能力。
In order to study the variation regularity of soil organic carbon under different fertilization conditions and the application of DNDC model, long-term positioning test data of different fertilization measures in Fengqiu calcareous soil were used to select CK, NPK, 1 / 2NPK + 1 / 2OM and OM4 The changes of crop yield and soil organic carbon (SOC) during the past 15 years were analyzed. The DNDC model was used to predict the SOC trend in the past 100 years (2000-2099). The results showed that there was significant difference between the average annual yield of each fertilization treatment and that of the control treatment. There was also significant difference between the treatments of NPK and 1 / 2NPK + 1 / 2OM and OM. The highest yield was NPK 10811 kg / ha, CK treatment lowest, but 1 / 2NPK + 1 / 2OM treatment output and NPK treatment no significant difference. In 15 years, the mean value of organic carbon in topsoil (0-20cm) was the highest in OM treatment, reaching 7.90g / kg, significantly higher than 1 / 2NPK + 1 / 2OM and NPK treatments, while the CK treatment was only 4.15g / kg. From 15 years of organic carbon changes, CK treatment decreased slightly, NPK treatment was relatively stable, while 1 / 2NPK + 1 / 2OM and OM treatments showed a rising trend, OM treatment increased more than 1 / 2NPK + 1 / 2OM treatment Big. The long-term (100a) simulation of SOC variation showed that soil organic carbon content decreased by 52% compared with the initial soil SOC content after 100 days, while the SOC content of the NPK-treated soil was stable , While soil organic carbon increased obviously with 1 / 2NPK + 1 / 2OM treatment and OM treatment, and basically stabilized after about 25 years. After 100 years, soil organic carbon increased by 24% and 25% respectively compared with 2000. From the measured data analysis and DNDC model simulation analysis, we can see that organic manure and chemical fertilizer can achieve higher crop yield, and can effectively increase soil SOC content, so as to improve the sustainable utilization of soil.