秸秆生物炭输入对冻融期棕壤磷有效性的影响

发布时间：2018-05-09 14:57

本文选题：生物炭 + 冻融作用　；参考：《土壤学报》2017年01期

【摘要】：冻融交替是东北地区土壤常见的温度变化现象。通过室内模拟冻融循环方法,分析秸秆生物炭输入对冻融期东北地区棕壤有效磷影响规律及机理,探讨生物炭还田对东北春季作物生长初期土壤养分供应状况的影响。结果表明:(1)除在0~5次冻融循环中冻融次数对有效磷含量无显著影响外,冻融循环次数、生物炭施加量以及二者交互作用对土壤有效磷含量在各冻融阶段(0~5次、5~30次、0~30次)均有极显著影响。(2)培养结束后施加生物炭量2%、4%和6%处理,有效磷含量随生物炭施入量增大而依次增加,且均明显高于对照处理20%以上。各处理在第5次冻融左右达到峰值,有效磷含量增加幅度随生物炭施加量增加而减小。在第20次冻融循环后各处理有效磷含量达到相对谷值,此时施加生物炭处理有效磷含量较未冻融时有明显降低。说明,生物炭在常温培养时可以增加土壤有效磷含量,但是,在冻融过程中,相对于对照处理可以较好固持土壤磷素,减小磷素随融雪过程流失的风险。(3)通过分析生物炭输入后棕壤pH、电导率、有机质和中性磷酸酶活性等生物化学性质对冻融循环过程响应,以及不同冻融循环阶段与土壤有效磷相关分析,发现有机质含量在冻融循环过程中变化显著且与有效磷含量具有显著相关性。生物炭通过增强团聚体稳定性,减少有机质释放来固持土壤磷素。
[Abstract]:Alternate freezing and thawing is a common phenomenon of soil temperature change in Northeast China. The effects of straw biochar input on the available phosphorus of brown soil in Northeast China during freezing and thawing period were analyzed by simulating freeze-thawing cycle in laboratory. The effects of biochar returning to field on soil nutrient supply in the early stage of crop growth in Northeast China were discussed. The results showed that the number of freeze-thaw cycles had no significant effect on the content of available phosphorus except in the five freeze-thaw cycles. The amount of biochar and the interaction of the two effects on the content of available phosphorus in the soil at each freezing and thawing stage had a significant effect on the content of available phosphorus at 5 times, 530 times, 0 times, 30 times.) after the end of culture, the amount of biochar was 2% and 6%, respectively, and the amount of biochar was 2% and 6% respectively. The available phosphorus content increased with the increase of the amount of biochar application, and was significantly higher than that of the control treatment by more than 20%. The peak value of each treatment was reached at the fifth freeze-thaw stage, and the increase of available phosphorus content decreased with the increase of the amount of biochar. After the 20th freeze-thaw cycle, the available phosphorus content of each treatment reached the relative valley value, and the available phosphorus content of the biological carbon treatment was obviously lower than that of the non-freezing and thawing treatment. The results show that biochar can increase the content of available phosphorus in soil at room temperature, but in the process of freezing and thawing, compared with the control treatment, biochar can stabilize the phosphorus content of soil better. To reduce the risk of phosphorus loss with snowmelt, the biochemical properties of brown soil, such as pH, electrical conductivity, organic matter and neutral phosphatase activity, were analyzed to respond to the freeze-thaw cycle. It was found that the content of organic matter changed significantly during freeze-thaw cycle and correlated with the content of available phosphorus in different stages of freeze-thaw cycle. Biochar can stabilize soil phosphorus by increasing the stability of aggregates and reducing the release of organic matter.
【作者单位】：沈阳农业大学水利学院;
【基金】：国家自然科学基金项目(41471225) 辽宁省农业领域青年科技创新人才培养计划(2014054) 辽宁省高等学校优秀人才支持计划(LJQ2013074)共同资助~~
【分类号】：S158

【相似文献】