Heating of soil influences soil respiration and nutrient availability. But little is known about how amendment type (plant residue or inorganic N and P fertilisers) or time between amendment application and heating influence the effect of heating. A sandy clay loam was incubated moist (165 g kg −1 ) for 8 days and amended with the same amount of total N and P as pea residue (C/N 59, C/P 435) or inorganic N and P (0.4 g N kg −1 and 0.06 g P kg −1 ) either 8 or 1 day before heating. On day 8, soils were heated to 60 °C for 30 min followed by rewetting to 165 g water kg −1 and moist incubation for 7 days. Soil was sampled before heating (day 8), 2 and 7 days after heating (day 10 and 15). Heating only reduced respiration when residue was added 1 day before heating. Heating had no effect on available N in fertiliser treatments. Heating increased available N on day 10 in the unamended soil by about 20% and in residue treatments about 10-fold, particularly when residue was added 1 day before heating. Heating increased phosphatase P two- to fivefold only on day 10; it increased citrate P on days 10 and 15 up to threefold compared with a greater effect in the residue treatments. Heating of soil had a greater effect of on respiration and available N and P pools after residue addition than unamended soil or soil amended with inorganic fertiliser.

中文翻译：

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添加方式和时间对短期加热对土壤呼吸和养分有效性的影响

土壤加热会影响土壤呼吸和养分有效性。但关于改良剂类型（植物残留物或无机氮磷肥）或改良剂施用与加热之间的时间如何影响加热效果知之甚少。将砂质粘土在潮湿环境 (165 g kg -1 ) 中培养 8 天，并用与豌豆残留物 (C/N 59, C/P 435) 或无机 N 和 P (0.4 g) 相同量的总氮和磷进行修正N kg -1 和 0.06 g P kg -1 ) 在加热前 8 或 1 天。在第 8 天，将土壤加热至 60 °C 30 分钟，然后再润湿至 165 g 水 kg -1 并潮湿培养 7 天。在加热前（第 8 天）、加热后第 2 天和第 7 天（第 10 天和第 15 天）对土壤取样。如果在加热前 1 天添加残留物，则加热只会降低呼吸作用。加热对肥料处理中的有效氮没有影响。在第 10 天，加热使未改良土壤中的有效氮增加了约 20%，在残留物处理中增加了约 10 倍，特别是在加热前 1 天添加残留物时。加热使磷酸酶 P 仅在第 10 天增加了 2 到 5 倍；与残留处理的更大效果相比，它在第 10 天和第 15 天将柠檬酸盐 P 增加了三倍。添加残留物后，加热土壤对呼吸和有效氮和磷库的影响比未改良的土壤或用无机肥改良的土壤更大。