| 不同降雨条件下沂蒙山区耕层土壤团聚体特征 |
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| 引用本文： | 王月月,吴元芝,范雯华,丁文雪,魏玮.不同降雨条件下沂蒙山区耕层土壤团聚体特征[J].水土保持研究,2022,29(1):92-99. |
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| 作者姓名： | 王月月 吴元芝 范雯华 丁文雪 魏玮 |
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| 作者单位： | (山东省水土保持与环境保育重点实验室, 临沂大学 资源环境学院, 山东 临沂 276000) |
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| 基金项目： | 临沂大学校科研资助项目(40618108);国家自然科学基金项目(40907006)。 |
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| 摘 要： | 降雨强度和时长对土壤团聚体的影响至关重要,不同降雨特征下沂蒙山区耕层土壤团聚体时空变异特征仍不清晰。基于模拟降雨试验,研究了不同降雨强度(16 mm/h,43 mm/h,71 mm/h)和降雨时长(10 min,30 min,60 min)下沂蒙山区褐土耕层土壤团聚体特征。结果表明:降雨强度16 mm/h,10 min降雨时长下仅对0—5 cm土层土壤团聚体产生影响,>5 mm粒级团聚体含量迅速降低。其他雨强和时长下,0—5,5—10,10—20 cm土层团聚体含量均发生变化。在43,71 mm/h的降雨强度下,随着降雨时长的增加,0—5 cm土层微团聚体含量均表现出先增加后降低的趋势。与供试土壤相比,雨强为71 mm/h,降雨时长60 min时,0—5 cm土层>5 mm粒级团聚体含量减少了93%,而<0.25 mm粒级团聚体含量增加了42%。土壤团聚体的平均重量直径(MWD)随降雨强度及时长的增加而减小,在降雨强度71 mm/h,降雨时长60 min时各土层MWD趋于一致。说明,随降雨强度及时长的增加,雨滴打击和雨水湿润作用对土壤大团聚体的拆分作用增强,大团聚体含量逐渐减少,微团聚体含量逐渐增加,土壤稳定性先降低后趋于稳定。
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| 关 键 词： | 沂蒙山区 耕层土壤 降雨时长 降雨强度 土壤团聚体 |
Characteristics of Soil Aggregates in Cultivated Layer of Yimeng Mountain Area Under Different Rainfall Conditions |
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| WANG Yueyue,WU Yuanzhi,FAN Wenhua,DING Wenxue,WEI Wei.Characteristics of Soil Aggregates in Cultivated Layer of Yimeng Mountain Area Under Different Rainfall Conditions[J].Research of Soil and Water Conservation,2022,29(1):92-99. |
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| Authors: | WANG Yueyue WU Yuanzhi FAN Wenhua DING Wenxue WEI Wei |
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| Affiliation: | (Shandong Provincial Key Laboratory of Soil and Water Conservation and Environmental Protection, School of Resources and Environment, Linyi University, Linyi, Shandong 276000, China) |
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| Abstract: | Rainfall intensity and rainfall duration are important factors affecting soil aggregates.However,less information is available for the effect of rainfall intensity and duration on soil aggregates characteristics in cultivated layer of Yimeng Mountain area.Soil aggregates in a cultivated layer in the Yimeng Mountain area were studied before and after various intensities(16 mm/h,43 mm/h,71 mm/h)and durations(10 min,30 min,60 min)of artificially simulated rainfall.The results showed that the rainfall with intensity of 16 mm/h and duration of 10 min caused a rapid decrease of the>5 mm aggregate content in the 0—5 cm soil layer;rainfall with intensities of 43 and 71 mm/h caused the microaggregate content of the 0—5 cm soil layer to initially increase and then to decrease;compared to the original soil condition,the>5 mm aggregate content decreased by 93%in the 0—5 cm soil layer,and the<0.25 mm aggregate content increased by 42%under the rainfall intensity of 71 mm/h for a duration of 60 min;the mean weight diameter(MWD)of soil aggregates declined as rainfall intensity and duration increased,and the MWD values of three soil layers(0—5 cm,5—10 cm and 10—20 cm)tended to be similar under the rainfall intensity of 71 mm/h for 60 min.The above results indicate that the decomposition of soil macroaggregates was enhanced with the increase of rainfall intensity and rainfall duration,leading to gradual decrease in macroaggregate content and gradual increase in microaggregate content,and the soil stability first decreased and then tended to be stable. |
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| Keywords: | Yimeng Mountain area cultivated layer soil rainfall duration rainfall intensity soil aggregate |
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