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通过野外调查采样和室内氯仿熏蒸提取法分析,研究了辽宁省旱地、稻田、湿地、草地、森林、果园6种不同土地利用方式共计35个样地表层土壤(0～10 cm、10～20 cm、20～30 cm)对土壤微生物量碳(SMBC)和土壤微生物量氮(SMBN)的影响。结果表明,土地利用方式对土壤微生物量有显著影响,其中土壤微生物量碳依次为森林>湿地>稻田>旱地>果园>草地;土壤微生物量氮则为森林>旱地>稻田>果园>湿地>草地。土壤微生物量碳氮均表现为森林显著高于其他土地利用方式,湿地、稻田、旱地、果园高于草地。除旱地和稻田,土壤微生物量碳随土层加深含量递减;而土壤微生物量氮在6种土地利用类型中,均表现为随土层加深含量递减。相关分析表明,土壤微生物量碳、氮之间显著相关,土壤微生物量碳、氮是可以表征土壤肥力的敏感因子。
A total of 35 soil samples (0-10 cm, 10-20 cm) were collected from field surveys and field chloroform fumigation methods in six different land use types including dry land, paddy field, wetland, grassland, forest and orchard in Liaoning Province. , 20 ~ 30 cm) on soil microbial biomass carbon (SMBC) and soil microbial biomass nitrogen (SMBN). The results showed that the pattern of land use had a significant effect on soil microbial biomass. The order of soil microbial biomass C was forest> wetland> paddy field> dry land> orchard> grassland; soil microbial biomass nitrogen was forest> dry land> paddy field> orchard> wetland> meadow . Soil microbial biomass carbon and nitrogen showed that the forest was significantly higher than other land use patterns, wetland, paddy field, dry land, orchard than the grassland. In addition to dry land and paddy field, soil microbial biomass carbon decreased with soil depth, while soil microbial biomass nitrogen decreased with soil depth in all six land use types. Correlation analysis showed that there was a significant correlation between soil microbial biomass carbon and nitrogen, and soil microbial biomass carbon and nitrogen were the sensitive factors that could characterize soil fertility.