【摘要】：采用氯仿熏蒸-浸提法,以寧夏鹽池荒漠草原3種典型群落(檸條、沙蒿、短花針茅)類(lèi)型為研究對(duì)象,分析了不同生境(冠下、叢間)和不同土層間(0~5、5~10、10~15cm)土壤理化性質(zhì)及微生物量——微生物量碳(MBC)和微生物量氮(MBN)的變化特征。結(jié)果表明:(1)3種群落土壤微生物量變化差異較大,檸條、沙蒿和短花針茅群落土壤MBC含量分別為77.00~393.18、17.27~221.71和81.05~173.37mg/kg,MBN含量分別為7.59~64.81、1.43~13.95和4.25~22.13mg/kg,MBC和MBN含量均表現(xiàn)為:冠下叢間,且隨土層深度的增加而降低,有明顯的"沃島效應(yīng)"。(2)群落類(lèi)型對(duì)土壤微生物量碳氮含量的變化有顯著影響,3種典型群落類(lèi)型下土壤微生物量熵(qMB)、碳氮比(C/N)、微生物量碳氮比(MBC/MBN)分別在0.76~4.10、15.02~52.50、5.34~23.07范圍內(nèi)變化,其比值在不同生境和不同土層深度的分布特征有明顯差異。(3)3種典型群落類(lèi)型的土壤MBC與SOC、MBN、qMB具有顯著相關(guān)關(guān)系,土壤C/N與MBC/MBN呈顯著正相關(guān)關(guān)系,表明土壤MBC、MBN具有一定的生物學(xué)指示特性,可以作為評(píng)價(jià)土壤質(zhì)量的生物學(xué)指標(biāo)。
[Abstract]:Three typical communities (Caragana korshinskii, Artemisia annua, Thunb.) in Yanchi desert steppe of Ningxia were studied by chloroform fumigation and extraction, and different habitats (under crown) were analyzed. Soil physical and chemical properties and microbial biomass-microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) were studied in different soil layers (0: 5, 5: 10, 10: 15 cm). The results showed that: (1) the soil microbial biomass of the three communities varied greatly. The soil MBC contents of Caragana korshinskii, Artemisia annua and Stipa brevis communities were 77.00 393.18, 17.27 鹵221.71 and 81.05 鹵173.37 mg 路kg ~ (- 1), respectively. The contents of MBN were 7.59 鈮，

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