It is not clear how different rewetting intensities (rapid, slow or partial rewetting) influence soil respiration and nitrogen (N) availability. Moist soil left unamended or amended with low C/N faba bean residue and incubated for 21 days was dried to <5% WHC within 3 days. After 14 days of incubation, dry soils were rewetted to 50% water holding capacity (WHC), once within few seconds (rapid), by two applications at 25% WHC each, with 6-h interval between rewetting events (slow), or single application at 25% WHC (partial). The soils were further incubated for another 14 days. One day after rewetting in unamended and amended soils, respiration rate followed the order slow > rapid > partial rewetting. From day 4 onwards, moisture treatments differed little in respiration rate. In unamended soils, the rewetting intensity had little effect on available N. But 1 day after rewetting, MBN was lowest in CM, and twofold, fourfold and tenfold higher with rapid, slow and partial rewetting, respectively. In amended soils 1 day after rewetting, available N was about twofold higher in CM and with rapid than slow and partial rewetting, while MBN was about twofold higher with CM and rapid rewetting than slow and partial rewetting. Treatments differed little in available N and MBN 7 and 14 days after rewetting. Slow rewetting induced greater soil respiration and microbial N uptake than rapid rewetting. But effects were short-lived.

尚不清楚不同的再润湿强度（快速，缓慢或部分再润湿）如何影响土壤呼吸和氮（N）的利用率。保留未改性或用低C / N蚕豆残渣改性的潮湿土壤，并孵育21天，并在3天内干燥至<5％WHC。孵育14天后，将干燥的土壤重新湿润至50％持水量（WHC），在几秒钟内（快速）重新湿润一次，两次两次，每次加水25％WHC，两次重湿之间间隔6小时（缓慢），或WHC 25％（部分）的单次施用。将土壤进一步温育另外14天。在未改良和改良过的土壤中重新润湿一天后，呼吸速率按照从慢>快速>部分重新润湿的顺序进行。从第4天开始，水分处理的呼吸速率差异很小。在未改良的土壤中 再润湿强度对有效氮影响不大。但是，再润湿后1天，MBN在CM中最低，分别以快速，缓慢和部分再润湿高出两倍，四倍和十倍。在再湿润1天后的改良土壤中，有效态氮在CM中高约2倍，而快速和慢速和部分再湿性比MBN高约两倍。再润湿后第7天和第14天，可用氮和MBN的处理差异不大。与快速再湿润相比，慢速再湿润引起更大的土壤呼吸和微生物氮的吸收。但是效果是短暂的。有效态氮在CM中大约要高两倍，并且比慢速和部分再润湿要快两倍，而MBN在CM和快速再润湿的情况下比慢速和部分再润湿要高两倍。再润湿后第7天和第14天，可用氮和MBN的处理差异不大。与快速再湿润相比，慢速再湿润引起更大的土壤呼吸和微生物氮的吸收。但是效果是短暂的。有效态氮在CM中大约要高两倍，并且比慢速和部分再润湿要快两倍，而MBN在CM和快速再润湿的情况下比慢速和部分再润湿要高两倍。再润湿后第7天和第14天，可用氮和MBN的处理差异不大。与快速再湿润相比，慢速再湿润引起更大的土壤呼吸和微生物氮的吸收。但是效果是短暂的。