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以森林和菜地土壤为对照,采用实验室培养法分别测定了高产、中产、低产茶园土壤的基础呼吸速率,并研究了加氮200 mg N kg-1[(NH4)2SO4]、含水量(田间持水量的40%、60%、80%、100%),以及水、氮互作对土壤基础呼吸的影响。结果表明,在14 d的培养期间,菜地和森林土壤呼吸速率先高后低,茶园土壤变化不大;累计CO2排放量:高产茶园>中产茶园>菜地>低产茶园>森林。加氮对土壤呼吸的促进作用随着土壤肥力水平的降低而提高;土壤含水量对呼吸作用的影响不显著;水、氮互作对高产茶园和森林土壤的呼吸作用有显著影响,对其它土壤影响不明显。
The basic respiration rate of high, middle and low yielding tea plantation soils was determined by laboratory culture method in the forest and vegetable soil soils. The effects of 200 mg N kg-1 [(NH4) 2SO4], water content ( 40%, 60%, 80%, 100% of field capacity), and the effect of water and nitrogen interaction on soil respiration. The results showed that during the 14 days of cultivation, the soil respiration rate in the vegetable field and forest increased first and then decreased while the soil in the tea plantation did not change much. The cumulative CO2 emission: high yield tea plantation> middle yield tea plantation> vegetable field> low yield tea plantation> forest. The effect of nitrogen addition on soil respiration increased with the decrease of soil fertility level. Soil moisture had no significant effect on respiration rate. The interaction of water and nitrogen had significant effect on respiration of high-yielding tea plantations and forest soils, Not obvious.