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为了解秸秆还田通过改变土壤酶活性影响稻田土壤二氧化碳排放的过程,通过大田试验分析小麦和油菜秸秆翻埋还田(W1,R1)、覆盖还田(W2,R2)以及不还田(CK)处理下土壤呼吸和酶活性的变化及其对不同秸秆还田方式的响应.结果表明:(1)不同秸秆还田方式下土壤呼吸均表现为双峰值,峰值分别出现在6月(208.3±6.1 mL/kg)和9月(106.2±13.5 mL/kg).除油菜秸秆翻埋还田外,其他秸秆还田方式均增加了土壤呼吸作用.(2)土壤脲酶和蔗糖酶对不同秸秆还田方式响应各异.不同秸秆还田方式下土壤脲酶活性变化较小,没有表现出显著差异性.由此表明,不同秸秆还田对氮相关酶活性及氮素转化影响较小.而蔗糖酶在不同秸秆还田方式下差异较大.(3)蔗糖酶与土壤呼吸存在显著正相关关系(P<0.05).上述结果表明蔗糖酶对秸秆还田较为敏感,可较好地表征秸秆还田过程中土壤呼吸变化状况,可为稻田营养循环利用提供有效依据.
In order to understand the effect of straw returning on soil carbon dioxide (CO2) emission in paddy soils by changing soil enzyme activities, field experiments were carried out to analyze the effects of straw returning to field (W1, R1), covering to field (W2, R2) ) Under different treatment conditions.The results showed that: (1) The soil respiration under different straw-returning regimes showed bimodal spikes, peaked at 208.3 ± 6.1 mL / kg) and September (106.2 ± 13.5 mL / kg), respectively. All other straw returning methods increased the soil respiration except the rape straw returning to the field. (2) The results showed that different straw returning had little effect on nitrogen-related enzyme activity and nitrogen transformation, while invertase activity of different straw returning methods had little change, (3) There was a significant positive correlation between sucrase and soil respiration (P <0.05) .The above results indicated that sucrase was more sensitive to straw returning and better characterized straw returning The process of soil respiration changes, for rice Nutrient recycling provide an effective basis.