| 李欢,赵平,陈林康,李连华,向蕊,龙光强.添加不同类型秸秆对土壤CO2排放和化学性质的影响[J].农业环境科学学报,2022,41(4):909-918. |
| 添加不同类型秸秆对土壤CO2排放和化学性质的影响 |
| Effects of addition of different types of straw on soil CO2 emission and soil chemical properties |
| 投稿时间：2021-09-02 |
| DOI：10.11654/jaes.2021-1007 |
| 中文关键词: 秸秆还田 CO2排放速率 CO2累积排放量 土壤养分 |
| 英文关键词: straw return CO2 emission rate cumulative CO2 emission soil nutrient |
| 基金项目:国家自然科学基金项目（41967004）；云南省重点研发计划项目（2018BB015） |
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| 中文摘要: |
| 秸秆组成和土壤性质是秸秆腐解的重要影响因素，进而调控着秸秆还田后的土壤CO2排放和土壤养分动态。本研究选取了玉米秸秆（MS）、马铃薯秸秆（PS）及其等比例混合秸秆（CS）3种秸秆类型，分别添加到3种种植模式[玉米单作（MM）、马铃薯单作（MP）和玉米马铃薯间作（I）]土壤中，进行105 d的室内恒温培养试验，以探究秸秆类型在不同环境中的CO2排放及土壤化学性质变化。结果表明：土壤种植模式显著影响MS的CO2累积排放量，而对CS、PS没有显著影响。与玉米和马铃薯单一秸秆的加权平均（WM）相比，秸秆混合分别增加了MM土壤中CO2累积排放量和净累积排放量19.2%和19.9%。与培养前相比，MS在培养结束时增加了土壤pH和可溶性有机碳含量，但对速效磷和速效钾的影响较小，且显著低于PS和CS。当同一秸秆添加到不同作物种植模式土壤中，MP土壤的速效磷、速效钾和铵态氮含量的增幅（相对于培养前）均高于I和MM。研究表明，秸秆在土壤中的腐解与碳排放首先受碳氮比调控，而土壤种植模式的作用较小，同时这些因素均对腐解过程土壤化学性质产生显著影响。 |
| 英文摘要: |
| Straw composition and soil properties are the important factors effecting straw decomposition, and they thus affect the soil CO2 emission and nutrient dynamics. In this study, three types of straw [maize（MS）, potato（PS）, and maize–potato mixed straw（CS）] were selected and added into three cropping pattern soils [maize monoculture（MM）, potato monoculture（MP）, and maize–potato intercropping （I）], respectively. A 105-day, indoor, constant temperature culture experiment was conducted to explore the CO2 emission and soil chemical properties changes of the straw types in the different sub-environments. The results showed that the soil cropping pattern significantly affected the cumulative CO2 emission after incorporating MS straw but that it had no significant effect on PS or CS straw. Compared with the weighted average（WM）of MS and PS single straw, CS increased the cumulative CO2 emission and the net cumulative CO2 emission in MM soil by 19.2% and 19.9%, respectively. Compared with the before-culture condition, MS increased the soil pH and dissolved organic carbon content by the end of the culture, but it had little effect on available P and available K and had a significantly lower effect than PS or CS. When the same straw was added to the soils with the different cropping patterns, the increases of available P, available K, and ammonium N were higher in MP soil（relative to before culture）than in I or MM soil. In conclusion, straw decomposition and carbon emission in soil are firstly affected by straw autacoids, and the influence of the soil cropping pattern is lower. These factors have an important influence on soil chemical properties during the decomposition process. |
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