应用Le Bissonnais法研究不同植烟年限土壤团聚体的稳定性

发布时间：2018-05-10 10:17

本文选题：Le + Bissonnais法　；参考：《西南农业学报》2017年05期

【摘要】：【目的】了解四川重点植烟区凉山州冕宁县长期种植烤烟的土壤在连作不同时间后土壤团聚体的稳定性。【方法】Le Bissonnais(LB)法和湿筛(Yoder)法。【结果】(1)在LB法不同处理下,不同粒径土壤团聚体所占比例存在明显差异。5 mm土壤团聚体含量所占比例表现为预湿后扰动处理(wet stirring,WS)慢速湿润处理(slow wetting,SW)快速湿润处理(fast wetting,FW),2~1 mm、0.5~0.25 mm和0.25 mm团聚体所占比例均表现为FWSWWS。(2)不同植烟年限土壤团聚体平均质量直径(MWD)和几何平均直径(GMD)具有相同的变化特点,均表现为WSSWFW。(3)FW处理和SW处理中,5 mm团聚体含量及MWD和GMD值均表现为随种植时间的延长而降低;WS处理则表现为先下降后升高,在连作6a时最低。【结论】(1)对土壤团聚体结构的破碎作用最大的是快速湿润处理(FW),其次是慢速湿润处理(SW)和预湿后扰动处理(WS)。(2)不同处理下土壤团聚体稳定性不同,一般在连作6a时稳定性最差。(3)LB法中WS处理的结果不仅与Yoder法结果相似,且可以较好的了解土壤团聚体的破碎机制,这种方法更适宜作为研究区植烟土壤团聚体稳定性的测定方法。
[Abstract]:[Objective] to understand the stability of soil aggregates after continuous cropping of flue-cured tobacco in Mianning County, Liangshan, Sichuan. [Methods] Le Bissonnais (LB) method and wet sieve (Yoder) method. [results] (1) the proportion of soil aggregates with different particle sizes is obviously different from.5 mm soil mass under the different treatment of LB method. The proportion of polymer content is the wet stirring (WS) slow wetting treatment (slow wetting, SW) fast wetting treatment (fast wetting, FW), 2~1 mm, the proportion of 0.5~0.25 accounts and 0.25 aggregate aggregates are all manifested as (2) the average mass diameter of soil aggregates and geometric mean diameter of different tobacco planting years. With the same change characteristics, both WSSWFW. (3) FW treatment and SW treatment, the content of 5 mm aggregates and MWD and GMD values were all decreased with the prolongation of planting time; WS treatment showed a decline first and then increased at the time of continuous 6A. [Conclusion] (1) rapid wetting treatment (FW) was the greatest effect on the fragmentation of soil aggregates. Secondly, slow humid treatment (SW) and pre wetting disturbance treatment (WS). (2) the stability of soil aggregates is different under different treatments. (3) the result of WS treatment in LB method is not only similar to the result of Yoder method, but also can better understand the mechanism of soil aggregate breaking. This method is more suitable for the study area. A method for the determination of the stability of soil aggregates.

【作者单位】：内江师范学院地理与资源科学学院;重庆师范大学地理与旅游学院;
【基金】：四川省教育厅项目“四川典型植烟区连作对农田土壤生态环境影响研究”(15ZB0273)
【分类号】：S152.4

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