| 摘要: |
| 【目的】研究不同有机物料对土壤肥力及土壤团聚体稳定性的影响。【方法】采用室内培养法，将采集到的土样分别与木屑、棉花、小麦秸秆按9∶1的质量比混合均匀，以土样中不添加有机物料为对照（CK），各处理中均加入EM菌剂，在25～30 ℃下堆放180 d，且每7 d翻堆1次。试验结束后，测定不同处理的土壤速效养分、中微量元素及有机质含量和阳离子交换量（CEC），采用因子分析法计算各处理的土壤肥力综合得分并进行排名，采用干筛法与湿筛法测定不同处理土壤水稳性团聚体的平均重量直径，并计算土壤团聚体的稳定性指数。【结果】与CK相比，3种有机物料均能提高土壤速效养分、中微量元素、有机质含量和CEC。采用因子分析法计算后可知，木屑处理的土壤肥力综合得分最高，达65.57，小麦秸秆、棉花处理土壤次之，但均高于CK。与CK相比，各有机物料处理土壤团聚体稳定性均有明显提高，其中以木屑处理土壤团聚体的稳定性指数最高，为4.111。【结论】采用木屑、小麦秸秆及棉花3种有机物料对土壤培肥后，均能不同程度地提高土壤肥力和土壤团聚体的稳定性，其中木屑的培肥效果最好。 |
| 关键词: 有机物料 土壤肥力 因子分析法 土壤团聚体 |
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| 基金项目:陕西省科技攻关项目（2009k01-02） |
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| Effects of different organic materials on soil fertility and aggregates stability |
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ZHAO Liang, LIU Cunshou
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Northwest A&F University
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| Abstract: |
| 【Objective】This study aimed to find out the effects of different organic materials on soil fertility.【Method】The collected samples mixed with different organic materials(sawdust,cotton,and wheat straw)were stored indoor with temperature of 25-30 ℃.EM bacteria were added to all treatments to enhance the degradation of organic materials.The experiment lasted for 180 d and the sample piles were stirred every 7 d.The contents of soil available nutrient,organic matter and CEC were measured at the end of experiment.The soil fertilities of all the samples were calculated and sorted using factor analysis and the water stable aggregate mean weight diameters(MWD)and stability indexes of different samples were calculated using the wet sieve analysis and dry sieve analysis.【Result】All treatments increased contents of soil available nutrient,organic matter and CEC compared to control group(CK).The overall score of treatment with sawdust was the highest with a peak value of 65.57,followed by wheat straw and cotton.The soil aggregate stability increased in all treatments compared to CK,and the sawdust treatment had the highest value of 4.111.【Conclusion】The soil fertility and the soil stability index of treatment with sawdust are much higher than that of other treatments. |
| Key words: organic materials soil fertility factor analysis soil aggregate |
