论文部分内容阅读
对茶园土壤添加不同用量石灰处理形成三种不同pH值的土壤,采用室内培养法,通过添加菜籽饼和硫酸铵,研究了pH及碳氮互作对茶园土壤基础呼吸速率的影响。结果表明:在培养的28天中,土壤基础呼吸速率表现出先高后低的趋势,不同pH值的茶园土壤以pH 4.05的土壤最高,显著高于其它2个土壤,pH 4.22土壤次之,pH 3.60土壤最低;添加菜籽饼可以显著增加土壤的呼吸速率,加氮对土壤基础呼吸速率的影响不明显;同时添加菜籽饼和氮肥在pH 4.22的土壤呼吸有协同增效作用,但在pH 3.60和pH 4.05的土壤不明显。试验还表明,土壤基础呼吸与土壤微生物量碳呈极显著正相关,但与土壤水溶性有机碳含量相关性不明显。
The effects of pH, carbon and nitrogen interaction on the basic respiration rate of tea plantation soils were studied by adding indoor cultivation method and adding rapeseed cake and ammonium sulfate to the tea plantation soils with different dosage of lime to form three kinds of soil with different pH values. The results showed that in the 28 days of cultivation, the soil respiration rate of the soil showed the trend of high and then low. The pH value of the tea plantation soil was the highest at pH 4.05, significantly higher than the other two soils, followed by pH 4.22 soil, pH 3.60 The lowest soil; Add rapeseed cake can significantly increase the soil respiration rate, the effect of nitrogen on soil respiration rate was not obvious; Simultaneous addition of rapeseed cake and nitrogen fertilizer have synergistic effect in soil respiration at pH 4.22, but at pH 3.60 and pH 4.05 soil is not obvious. The experiment also showed that there was a significant positive correlation between soil respiration and soil microbial biomass carbon, but no significant correlation with soil water-soluble organic carbon.