【摘要】：通過田間試驗探討了不施分蘗肥的有機(jī)無機(jī)復(fù)混肥運籌模式對機(jī)插水稻土壤總碳(TC)、總氮(TN)、微生物碳(MBC)、微生物氮(MBN)、土壤呼吸強度以及線蟲特征等土壤肥力關(guān)鍵指標(biāo)的影響。結(jié)果表明,有機(jī)無機(jī)復(fù)混肥作基肥施用,不施分蘗肥,穗肥施用一次(處理FMT)或二次(處理FMO)時水稻產(chǎn)量能夠達(dá)到或超過單施化肥處理水平。與單施化肥相比,有機(jī)無機(jī)復(fù)混肥處理顯著提高了土壤微生物量碳(MBC)和氮(MBN),MBC平均提高14.5%,MBN提高21.4%;土壤呼吸強度也得到明顯提高,平均增幅31.8%,然而有機(jī)無機(jī)復(fù)混肥對土壤總碳(TC)和全氮(TN)無顯著影響。有機(jī)無機(jī)復(fù)混肥處理降低了耕層(0~10 cm)土壤線蟲密度,并導(dǎo)致食細(xì)菌線蟲優(yōu)勢屬頭葉屬和真頭葉屬相對豐度下降,食細(xì)菌線蟲次優(yōu)屬繞線屬、連胃屬及植食性線蟲潛根屬相對豐度有所提高。應(yīng)用土壤養(yǎng)分指標(biāo)(TC、TN)、生物指標(biāo)(MBC、MBN、線蟲數(shù)量、土壤呼吸強度)進(jìn)行主成分分析和聚類分析,結(jié)合水稻產(chǎn)量、肥料利用率,表明有機(jī)無機(jī)復(fù)混肥運籌是一項集培肥、增產(chǎn)、操作性強的施肥方式。
[Abstract]:The effect of organic-inorganic compound fertilizer without tiller fertilizer on total carbon (TC), total nitrogen (TN), microbial carbon (MBC), microbial nitrogen (MBN), in mechanically inserted rice soil was studied by field experiment. Effects of key indexes such as soil respiration intensity and nematode characteristics on soil fertility. The results showed that the yield of rice could reach or exceed the level of fertilizer alone when organic-inorganic compound fertilizer was used as base fertilizer and no tiller fertilizer was applied, and the yield of rice could reach or exceed the level of chemical fertilizer treatment when panicle fertilizer was applied once (treatment FMT) or twice (treatment FMO). Compared with chemical fertilizer alone, organic-inorganic compound fertilizer treatment significantly increased soil microbial biomass carbon (MBC) and nitrogen (MBN), MBC by 14.5% and MBN by 21.4%. Soil respiration intensity also increased significantly, with an average increase of 31.8%. However, organic-inorganic compound fertilizer had no significant effect on soil total carbon (TC) and total nitrogen (TN). The treatment of organic-inorganic compound fertilizer decreased the density of soil nematodes in ploughing layer (0 鈮，

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