应用Le Bissonnais法研究不同植烟年限土壤团聚体的稳定性
【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FW〉SW〉WS。(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...
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Published in | 西南农业学报 Vol. 30; no. 5; pp. 1153 - 1157 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
内江师范学院地理与资源科学学院,四川内江,641199%重庆师范大学地理与旅游学院,重庆,400047
2017
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Subjects | |
Online Access | Get full text |
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Summary: | 【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FW〉SW〉WS。(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WS〉SW〉FW。(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。 |
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Bibliography: | Le Bissonnais method; Yoder method ; Tobacco ; Aggregate stability; Continuous cropping 51-1213/S [ Objective ] The present experiment aims to study the stability of tobacco soil aggregates in Mianning, Liangshan Yi Autonomous Prefecture and compare with the two methods for determining soil aggregates, finding a more suitable one for the study area. [ Method ] Le Bis- sonnais (LB) method and the wet sieve method (Yoder) were adopted. [ Result ] (i) Under different treatments of LB, the proportion of soil aggregates with different particle size was significantly different. In the three treatments of LB method ,the proportion of 〉 5 mm soil aggregate content showed WS (wet stirring) 〉 SW (slow wetting) 〉 FW (fast wetting) , that one of 2 -1,0.5 -0.25 and 〈 0.25 mm was FW 〉 SW 〉 WS. (2)The average mass diameter (MWD) and geometric mean diameter (GMD) of soil aggregates in different tobacco planting years had the same change characteristics, all of which were WS 〉 SW 〉 FW. (iii) In FW and SW treatment, the aggregat |
ISSN: | 1001-4829 |
DOI: | 10.16213/j.cnki.scjas.2017.5.029 |