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测定分析了黄土丘陵区纸坊沟流域人工林地、荒地和农地土壤微生物生物量碳(MBC)、氮(MBN)、磷(MBP)、全氮、有机质和速效磷。通过最小显著差异性(LSD)评价样地之间土壤微生物生物量和养分的差异显著性。结果表明,表层土壤中,农地和荒地土壤微生物生物量和养分显著小于林地土壤;同一土地利用类型下,退耕时间越长,土壤微生物生物量和养分含量越高;在同一时期退耕条件下,刺槐林地土壤微生物生物量显著大于油松林地。在黄土丘陵区实施的退耕还林可显著提高土壤微生物生物量和土壤养分。
The soil microbial biomass carbon (MBC), nitrogen (MBN), phosphorus (MBP), total nitrogen, organic matter and available phosphorus in artificial forest, wasteland and agricultural land in Zhifanggou watershed of Loess Hilly region were measured and analyzed. The significance of soil microbial biomass and nutrient difference was evaluated by least significant difference (LSD). The results showed that in topsoil, the soil microbial biomass and nutrients of farmland and wasteland were significantly less than those of forest land. Under the same land use type, the longer the time of returning farmland, the higher the soil microbial biomass and nutrient content. Under the conditions of returning farmland to the same land, The soil microbial biomass of Robinia pseudoacacia was significantly higher than that of Pinus tabulaeformis woodland. Returning farmland to forests in the loess hilly areas can significantly increase soil microbial biomass and soil nutrients.