蔗田土壤有机碳矿化量及矿化率的研究

Study on Soil Organic C Mineralization Amount and Rate in Sugarcane Field

根据N通量的质量平衡原理,以台糖16号为试验材料,通过2年的田间试验,测定第一年(新植蔗)和第二年(宿根蔗)土壤有机氮年矿化量、有机碳年矿化量和矿化率。结果表明,第一年蔗田土壤有机氮矿化量、有机碳矿化量和矿化率分别为115.22±15.77、1644.32±224.97 kg/hm2(3.59±0.49)%;第二年蔗田土壤有机氮矿化量、有机碳矿化量和矿化率分别是107.46±11.02、1478.59±151.65 kg/hm2(3.63±0.37)%;蔗田土壤有机氮年矿化量、有机碳年矿化量及耕层土壤有机碳年矿化率两年的平均值分别为111.34、1561.46 kg/hm2、3.61%。第一年与第二年的土壤有机氮矿化量和耕层土壤有机碳矿化率均无显著差异,但土壤有机碳矿化量是第一年大于第二年。

Based on the principle of nitrogen（N） flux mass balance,sugarcane cultivar ROC16 was tested for two years to study soil organic N mineralization amount（SONMA）,soil organic C mineralization amount（SOCMA） and soil organic C mineralization rate（SOCMR） in sugarcane field.For the first year （plant cane）,SONMA,SOCMA and SOCMR were 115.22±15.77,1644.32±224.97 kg/ hm2 and 3.59±0.49 %,respectively.For the second year（ratoon cane） SONMA,SOCMA and SOCMR were 107.46±11.02,1478.59±151.65 kg/hm2 and 3.63±0.37 %,respectively.On the base of two years＇ average,SONMA,SOCMA and SOCMR were 111.34 kg/ hm2,1561.46 kg/hm2 and 3.61 %,respectively.There was no significant difference between the first year and the second year for the SONMA and SOCMR.However,for the SOCMA,the first year is larger than the second year.