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研究了3种转Bt水稻[克螟稻(KMD)、华恢1号(HH1)和Bt汕优63(BtSY63)]及对应亲本在2年大田条件下对土壤可溶性有机碳(DOC)和可溶性有机氮(DON)及微生物学性质的影响.结果表明:测定指标均随采样时间发生显著变化.与对应亲本相比,转Bt水稻对土壤DOC、DON和微生物生物量氮(MBN)的影响不显著,而对土壤微生物生物量碳(MBC)、基础呼吸(BR)和微生物代谢熵(qCO2)的影响在大田种植第1年某些时段达到显著水平(P<0.05),但这种影响没有持续到第2年;3种亲本水稻土壤DOC、DON及微生物学性质差异均不显著,但相应转Bt水稻土壤MBC、BR、qCO2差异显著,BtSY63土壤MBC和BR显著高于KMD及HH1,而qCO2显著低于KMD及HH1.转Bt水稻2年的大田种植对土壤DOC和DON及微生物学性质的影响较小,但3种转Bt水稻之间微生物学性质的差异比亲本之间的差异大,表明长期监测可能有助于发现转Bt水稻对土壤生态系统结构和功能的影响.
The effects of three transgenic Bt rice varieties (KMD, HH1 and BtSY63) and their corresponding parents on soil dissolved organic carbon (DOC) and soluble Organic nitrogen (DON) and microbiological properties.The results showed that the determination indexes all changed significantly with the sampling time.Compared with the corresponding parents, the effects of transgenic Bt rice on soil DOC, DON and microbial biomass nitrogen (MBN) (P <0.05), but no significant effect on MBC, BR and qCO2 was observed at some time points in the first year of field planting (P <0.05) The results showed that MBC, BR and qCO2 in BtSY63 soil were significantly higher than those in KMD and HH1, but the contents of DOC, DON and microbiological characteristics were not significantly different among the three parental paddy soils. qCO2 was significantly lower than that of KMD and HH1. Two years of transgenic Bt rice had little effect on DOC and DON and microbiological characteristics of soils, but the differences in microbiological properties among the three Bt transgenic rice varieties were greater than those of parent , Suggesting that long-term monitoring may contribute to the discovery of Bt rice on soil ecosystem structure and The impact energy.