秸秆覆盖下土壤养分与微生物群落关系研究
发布时间:2018-08-24 07:28
【摘要】:以我国17省的85个土壤样品为研究对象,定量添加玉米秸秆置于30℃培养90d,研究处理后土壤有机质(SOM)含量及养分变化与微生物群落之间的关系。结果表明:土壤各理化指标除全氮、碱解氮、全磷含量在处理后部分土壤减少以外,全钾、速效钾、速效磷含量均显著增加;SOM变化差异显著,根据其变化量将土壤分为I_1组有机质增量(I)12.05g/kg,I2组0.25I9.0g/kg,I3组-112.3I-0.3g/kg。I_1和I_3组初始SOM含量高且相似,处理后SOM却出现显著增加和显著降低2种截然相反的结果,而初始SOM较低的I_2组增加,但不显著;初始可培养细菌远高于可培养真菌和放线菌,但处理后真菌增量显著高于细菌,I_3组最为明显;处理前后,I_2和I_3组部分土壤的微生物生物量碳(MBC)变化不显著,部分则显著下降,而I_1组MBC含量在处理后多为显著上升;磷脂脂肪酸(PLFA)测定结果表明I_2组土壤微生物受环境和养分胁迫较I_1和I_3组高,I_2组处理后MBC均值降低了10.3%。秸秆对土壤的添加效果除了受土壤本底养分等条件影响外,很大程度上决定于土壤原有微生物的类型和组成。PLFA可用于预测秸秆添加效果。
[Abstract]:In this paper, 85 soil samples from 17 provinces of China were studied. The relationship between soil organic matter (SOM) content and nutrient change and microbial community was studied by adding corn straw at 30 鈩,
本文编号:2200060
[Abstract]:In this paper, 85 soil samples from 17 provinces of China were studied. The relationship between soil organic matter (SOM) content and nutrient change and microbial community was studied by adding corn straw at 30 鈩,
本文编号:2200060
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