1. 山东师范大学地理与环境学院,济南,250358
2. 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,276005
[ "徐相忠(1992-),男,山东滕州人,在读硕士研究生,主要从事土壤侵蚀过程研究。E-mail:865893524@qq.com" ]
纸质出版:2020
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徐相忠, 刘前进, 张含玉. 降雨类型与坡度对棕壤垄沟系统产流产沙的影响[J]. 水土保持学报, 2020,34(4):56-62.
XU Xiangzhong, LIU Qianjin, ZHANG Hanyu. Effects of Rainfall Type and Slope on Runoff and Sediment Yield in Brown Soil Furrow System[J]. 2020, 34(4): 56-62.
徐相忠, 刘前进, 张含玉. 降雨类型与坡度对棕壤垄沟系统产流产沙的影响[J]. 水土保持学报, 2020,34(4):56-62. DOI: 10.13870/j.cnki.stbcxb.2020.04.009.
XU Xiangzhong, LIU Qianjin, ZHANG Hanyu. Effects of Rainfall Type and Slope on Runoff and Sediment Yield in Brown Soil Furrow System[J]. 2020, 34(4): 56-62. DOI: 10.13870/j.cnki.stbcxb.2020.04.009.
为深入理解棕壤垄作坡耕地的土壤侵蚀机理,利用1.60 m×0.53 m的试验土槽,设计2个降雨类型,即增强型(70~70~100~100 mm/h)和减弱型(100~100~70~70 mm/h),以及2个坡度(9°和18°)的人工模拟降雨试验。每个雨型分2个阶段(阶段I、阶段Ⅱ),每个阶段进行相同雨强的2个场次降雨,每个场次降雨历时20 min。结果表明:(1)雨强对径流量呈显著影响(P<0.05),100 mm/h雨强下的径流量>70 mm/h时的径流量。在减弱型雨型下,坡度对径流量影响显著(P<0.05),而增强型雨型下在不同阶段坡度对径流量的影响不同。(2)雨强对产沙量的影响显著(P<0.05),在阶段Ⅰ降雨中,100 mm/h雨强下9°和18°坡面的平均每分钟产沙量分别为70 mm/h雨强下的23.98,9.07倍。在70 mm/h雨强下,坡度对产沙量的影响显著(P<0.05),而100 mm/h雨强下不同阶段坡度对径流量的影响具有差异性。(3)100 mm/h雨强在不同雨型中出现的时序对产沙量影响不显著(P>0.05);在70 mm/h雨强下,产沙量整体较小,基本在15 g/min以下。同一雨强在不同雨型中的时序对径流量均存在显著影响(P<0.05)。(4)总径流量从大到小依次为:9°减弱型 > 18°减弱型 > 9°增强型 > 18°增强型;总产沙量从大到小依次为:18°增强型 > 18°减弱型 > 9°减弱型 > 9°增强型。不同雨型下,雨强发生改变后,累计径流量和累计产沙量增加速率和雨强的改变具有一致性。
In order to deeply understand the soil erosion mechanism of ridged farmland on brown soil
this paper used a 1.60 m×0.53 m test soil trough and designed two rainfall types
namely
intensive-type (70~70~100~100 mm/h) and reduced-type (100~100~70~70 mm/h)
and artificial simulated rainfall tests on 2 slopes (9° and 18°). Each rainfall type is divided into two phases (phase I
phase Ⅱ)
and two sessions of rainfall of the same raininess at each stage
and each session of rainfall lasts 20 minutes. The results show: (1) Raininess has a significant effect on runoff (P <0.05). Runoff at 100 mm/h rain intensity is greater than 70 mm/h. Under the reduced rainfall type
the slope has a significant effect on runoff (P<0.05)
while under the intensive rainfall type
the slope at different stages has different effects on runoff. (2) Raininess has a significant effect on sediment yield (P<0.05). During the rainfall of Phase I
the average sediment yield per minute at 9° and 18° slopes at 100 mm/h raininess was 23.98 times and 9.07 times of 70 mm/h raininess. Under 70 mm/h raininess
the slope has a significant effect on sediment yield (P<0.05)
while under 100 mm/h raininess
the slope at different stages has different effects on runoff. (3) The time sequences of 100 mm/h raininess in different rainfall types has no significant effect on sediment yield (P>0.05); under 70 mm/h raininess
the overall sediment yield is smaller
basically below 15 g/min.The time sequences of the same raininess in different rainfall types had significant effects on runoff (P<0.05). (4) The total runoff is as follows: 9° reduced-type > 18° reduced-type > 9° intensive-type > 18° intensive-type; the total sediment production is in descending order: 18° intensive-type > 18° reduced-type > 9° reduced-type > 9° intensive-type. Under different rainfall type
after the change of rain intensity
the cumulative runoff and cumulative sediment yield increase rate and the change of rain intensity are consistent.
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