| 焦健宇,郑粉莉,王婧,王雪松,魏晗梅.CO2浓度与温度升高对谷子各生育期土壤微生物生物量的影响[J].干旱地区农业研究,2022,40(1):104~112 |
| CO2浓度与温度升高对谷子各生育期土壤微生物生物量的影响 |
| Effects of CO2 concentration and temperature elevation on soil microbial biomass at different millet growth stages |
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| DOI：10.7606/j.issn.1000-7601.2022.01.12 |
| 中文关键词: CO2浓度升高 温度升高 谷子 地下生物量 土壤微生物生物量 轻度干旱 |
| 英文关键词:elevated CO2 concentration warming millet belowground biomass soil microbial biomass mild drought |
| 基金项目:中国科学院国际合作局对外合作重点项目“气候变化对中国黄河中游和塞尔维亚萨瓦河流域农业水土环境影响评估及适应对策”(161461KYSB20170013) |
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| 中文摘要: |
| 为探究CO2浓度升高、增温以及二者交互作用对谷子各生育期土壤微生物生物量的影响，采用盆栽试验，通过人工气候室控制环境CO2浓度和温度，设置对照（400 μmol·mol-1 CO2浓度和22℃环境温度，CK）、CO2浓度升高（700 μmol·mol-1 CO2浓度和22℃环境温度，EC）、 CO2浓度升高和增温4℃（700 μmol·mol-1 CO2浓度，26℃环境温度，EC+T）3种气候条件，且每个气候条件均设置充分供水（70.0%田间持水量）和轻度干旱（50.0%田间持水量）两种水分处理，分析CO2浓度升高、增温4℃以及二者交互作用对谷子各生育期（开花期、开花后10 d、灌浆期、成熟期）土壤微生物生物量碳（MBC）、土壤微生物生物量氮（MBN）、土壤微生物生物量磷（MBP）的影响。结果表明：在充分供水条件下，CO2浓度升高使土壤MBC、MBN、MBP含量分别增加了27.01%~102.52%、27.02%~54.60%、74.05%~161.42%（P＜0.05），但其影响程度随着谷子生长而逐渐减弱；与EC相比，EC+T处理使各生育期土壤MBC、MBN、MBP含量分别降低了19.77%~28.22%、8.56%~20.24%、29.54%~39.70%（P＜0.05）。在轻度干旱条件下，谷子各生育期的土壤MBC和MBN含量在3种气候情景（CK、EC、EC+T）间无显著差异，各生育期土壤MBP含量无明显变化规律。在3种气候条件下，与充分供水相比，轻度干旱使开花期、开花后10 d、灌浆期土壤MBC和MBN含量分别降低了14.70%~38.53%和37.06%~78.10%（P＜0.05），但其对土壤MBP含量影响不显著。在充分供水的条件下，CO2浓度升高和增温的交互作用显著增加了谷子开花期和开花后10 d的土壤MBC和MBN含量，二者在开花期增幅分别为44.37%和16.15%（P＜0.05），在开花后10 d增幅分别为45.38%和27.18%（P＜0.05）；CO2浓度升高和生育期的交互作用对土壤MBC、MBN、MBP含量有显著影响；但增温和生育期的交互作用对土壤MBC、MBN、MBP含量均无显著影响。对于谷子地下生物量而言，在充分供水条件下，CO2浓度升高使开花期和开花后10 d谷子地下生物量增加了85.71%和27.38%（P＜0.05），但对灌浆期和成熟期的地下生物量的影响不显著；与EC相比，EC+T处理使开花期和开花后10 d的地下生物量降低了15.12%和12.44%（P＜0.05），但对灌浆期和成熟期地下生物量的影响不显著。在轻度干旱条件下，3种气候情景间的谷子地下生物量总体上无显著差异。 |
| 英文摘要: |
| This study aimed at quantifying the effects of elevated CO2 concentration and temperature raising, and their interactions on soil microbial biomass at different growth stages of millet. A pot experiment was conducted within artificial climate chambers. Six treatments were designed with three climate scenarios under two water supply conditions. The three climate scenarios included one control experiment (400 μmol·mol-1 CO2 concentration and 22℃ temperature, CK), CO2 concentration elevation and temperature keeping the same as CK (700 μmol·mol-1 CO2 concentration and 22℃ temperature, EC), and both CO2 concentration and temperature elevation (700 μmol·mol-1 CO2 concentration and 26 ℃ temperature, EC+T). Meanwhile, two water conditions (adequate water supply of 70% field capacity; mild drought of 50% field capacity) were design under each climate scenario. The microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and microbial biomass phosphorus (MBP) contents were measured at four millet growth stages, i.e., anthesis, 10 d after anthesis, filling stage, maturity.The results indicated that under adequate water condition, the elevation of CO2 concentration increased contents of soil MBC, MBN and MBP by 27.01%~102.52%,27.02%~54.60% and 74.05%~161.42% (P＜0.05), respectively; but the effects of elevated CO2 concentration on soil microbial biomass showed decreasing trends with millet growth. Compared with the EC treatment, EC+T treatment reduced contents of soil MBC, MBN and MBP by 19.77%~28.22%, 8.56%~20.24% and 29.54%~39.70% (P＜0.05), respectively. Under the mild drought condition, there were no significant differences in soil MBC and MBN contents at four millet growth stages among three climate scenarios, and the content of soil MBP did not have an obvious changing trend. Compared with adequate water supply condition, mild drought condition decreased contents of soil MBC and MBN by 14.70%~38.53% and 37.06%~78.10% (P＜0.05), respectively,during the stages of anthesis, 10 d after anthesis and filling stage, but it had no significantly impacted on soil MBP.Under the adequate water condition, the interaction of elevated CO2 concentration and temperature rising significantly increased contents of soil MBC and MBN during the stages of anthesis and 10 d after anthesis, MBC and MBN contents increased 44.37%and 16.15% at anthesis, and 45.38% and 27.18% (P＜0.05) at 10 d after anthesis, while the interaction of CO2 concentration and growth stage had significant impacts on soil microbial biomass. In addition, the interaction of temperature increasing and millet growth stage had no significant influences on the contents of soil MBC, MBN and MBP. For millet belowground biomass, under adequate water condition, an elevation of CO2 concentration increased belowground biomass by 85.71% and 27.38% (P＜0.05) during the stages of anthesis and 10 d after anthesis, but there were no significant influences in the belowground biomass during filling stage and maturity.Compared with the EC treatment, EC+T treatment reduced the belowground biomass by 15.12%and 12.44% (P＜0.05) during the stages of anthesis and 10 d after anthesis, but it had no significant effects on the belowground biomass during the stages of falling stage and maturity. Under the mild drought condition, there were no significant differences in the belowground biomass at four millet growth stages among three climate scenarios. |
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