ZHU Zhizhuo,LI Long,ZHANG Peng,et al.Influence of Vegetation Pattern on Microtopography and Erosion Under Hydraulic Erosion in Feldspathic Sandstone Region[J].Research of Soil and Water Conservation,2023,30(03):10-18,26.[doi:10.13869/j.cnki.rswc.2023.03.040]
水力侵蚀下砒砂岩区植被格局对微地形和侵蚀的影响
- Title:
- Influence of Vegetation Pattern on Microtopography and Erosion Under Hydraulic Erosion in Feldspathic Sandstone Region
- 文章编号:
- 1005-3409(2023)03-0010-09
- Keywords:
- feldspathic sandstone; vegetation pattern; microtopography; runoff and sediment production
- 分类号:
- S157.1
- 文献标志码:
- A
- 摘要:
- [目的]研究植被格局下微地形与侵蚀的关系,可为砒砂岩地区坡面侵蚀规律研究和水土流失防治提供理论参考。[方法]以砒砂岩区鲍家沟流域内的3种植被格局(均匀分布、聚集分布、随机分布)坡面为研究对象,通过自然降雨条件下采用野外径流小区实测结合三维激光扫描技术,分析了植被格局对微地形和侵蚀的影响。[结果]降雨后不同植被格局坡面的产流量、产沙量依次为裸坡坡面>聚集分布坡面>随机分布坡面>均匀分布坡面,与裸坡相比,均匀分布坡面的产流量、产沙量分别减少了64%,75%,其径流泥沙的拟合函数为Y=0.3619x0.7309,R2=0.9866; 不同植被格局坡面侵蚀—沉积的空间分布存在一定差异,与其他坡面相比,均匀分布格局坡面的土壤侵蚀强度最弱,侵蚀区面积最小,为12.38 m2,沉积区面积最大,为3.44 m2。不同植被格局坡面地形因子均随降雨呈现增大的趋势,且与裸坡坡面相比,聚集分布坡面地表粗糙度、地表起伏度、地表切割度、微坡度增幅最小,分别为5%,2%,0.5%,9%。聚集分布坡面地表粗糙度与产流产沙的相关性最强(p<0.01),分别为0.632,0.619,相比较其他坡面,裸坡坡面地形因子与产流产沙拟合效果最好,产流拟合函数为X=0.993RA-1.07R+0.871,R2=0.996,产沙拟合函数为Y=1.586RA-0.62R+2.65,R2=0.964。[结论]均匀分布格局对水力侵蚀条件下砒砂岩坡面土壤侵蚀程度的抑制效果为最佳,但拟合效果最差,微地形因子与产流产沙的互动关系最为复杂。
- Abstract:
- [Objective]Studying the relationship between micro-topography and erosion under vegetation pattern can provide theoretical reference for the study of slope erosion law and soil and water loss control in feldspathic sandstone area. [Methods] Slopes with three planting patterns(uniform distribution, aggregation distribution, random distribution)in BaoJia watershed in feldspathic sandstone areas were selected as the research sites. Field measurements in runoff plots under the condition of natural rainfall and 3D laser scanning technology were jointly used, to analyze the influence of the vegetation pattern of microtopography and erosion. [Results] After rainfall, the order of discharge and sediment yield on different vegetation patterns was bare slope>aggregate slope>random slope>uniform slope. Compared with bare slope, discharge and sediment yield on uniform slope decreased by 64% and 75%, respectively. The fitting function of runoff and sediment is Y=0.3619x0.7309, R2=0.9866. There were some differences in the spatial distribution of erosion-deposition on slopes with different vegetation patterns. Compared with other slopes, the soil erosion intensity of homogeneous slope was the weakest, the erosion area was the smallest(12.38 m2), and the sediment area was the largest(3.44 m2). The slope topographic factors of different vegetation patterns showed the increasing trend with rainfall, and compared with bare slope, increments of the surface roughness, surface undulation, surface cleanness and micro-slope were the least, which were 5%, 2%, 0.5% and 9%, respectively. The correlations between surface roughness and runoff and sediment yield were 0.632 and 0.619, respectively. Compared with other slopes, the fitting effect of topographic factors on bare slope and sediment yield was the best. The fitting functions of runoff and sediment were expressed as X=0.993RA-1.07R+0.871,R2=0.996, Y=1.586RA-0.62R+2.65,R2=0.964, respectively. [Conclusion] The uniform distribution pattern has the best inhibition effect on soil erosion on feldspathic sandstone slope under hydraulic erosion condition, but the fitting effect is the worst. The interaction between microtopographic factors and sediment production and drainage is the most complex.
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备注/Memo
收稿日期:2022-03-08 修回日期:2022-03-31
资助项目:国家自然科学基金“砒砂岩坡面侵蚀时空变异与植被斑块格局演变互馈机制”(42267049); 高等教育改革发展项目—青年科技英才计划“西部之光项目—黄河多沙粗沙区坡面植被格局—土壤环境—产流产沙空间互馈机制研究”(NJYT22046); 内蒙古自治区科技计划项目“黄河十大孔兑流域生态修复空间精准识别与智慧水土保持技术”(2021GG0052)
第一作者:朱志卓(1998—),男,吉林白城人,在读硕士研究生,研究方向为水土保持与荒漠化防治。E-mail:1225801089@qq.com
通信作者:李龙(1989—),男,吉林桦甸人,博士,副教授,主要从事土壤侵蚀及水土保持相关研究。E-mail:lilongdhr@126.com