| 摘要: |
| 【目的】研究南方红壤丘陵区马尾松人工林地浅沟形态特征，为浅沟侵蚀的防治提供理论依据。【方法】基于RTK-GPS测量技术与ArcGIS空间分析方法，通过建立研究区典型坡面马尾松林地DEM，提取浅沟形态参数，定量分析红壤丘陵区马尾松林地浅沟的形态特征，初步建立基于该研究区的浅沟临界地形模型。【结果】（1）研究区浅沟汇流面积均值为21.62 m2，沟长均值为16.46 m，浅沟坡度均值为19.72°，沟宽均值为2.26 m，沟深均值为0.52 m，断面面积均值为0.58 m2。其中浅沟汇流面积属强变异，其余形态参数均为中等变异。与黄土丘陵沟壑区及东北黑土区坡耕地浅沟相比，南方红壤丘陵区马尾松人工林地的浅沟相对较短、较浅。（2）浅沟形态参数间存在极显著的相关关系，其中汇流面积与沟长、平均沟宽、平均沟深和平均断面面积极显著正相关（P<0.01），与浅沟坡度极显著负相关（P<0.01）；浅沟坡度与沟长、平均沟宽极显著负相关（P<0.01）。（3）南方红壤丘陵区马尾松人工林地浅沟发生的临界地形条件可以用汇流面积A与浅沟坡度Se的关系式“tan Se=0.49A-0.06”来判断。【结论】南方红壤丘陵区马尾松人工林地浅沟形态参数间存在极显著相关关系，地形因素（坡面坡长、坡度）显著影响该区域浅沟的形态特征。 |
| 关键词: 浅沟形态特征 临界地形 马尾松林地 红壤丘陵区 |
| DOI： |
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| 基金项目:江西省高等学校科技落地计划项目（KJLD14095） |
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| Morphological characteristics of ephemeral gullies of Pinus massoniana plantations in the Red Soil Hilly Region of southern China |
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YANG Wenli,ZHU Pingzong,ZHAO Jianmin,et al
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| Abstract: |
| 【Objective】This study explored the morphological characteristics of ephemeral gullies under Pinus massoniana plantations in the Red Soil Hilly Region of southern China for preventing severe soil and water loss.【Method】The real-time kinematic global positioning system (RTK-GPS) was used to monitor the morphological characteristics of ephemeral gullies under a P. massoniana plantation near Ji’an,Jiangxi.A digital elevation model (DEM) with 0.2 m×0.2 m grids was established and topographic parameters (length,slope gradient,width,depth,the upstream drainage area,and the cross-sectional area) of ephemeral gullies were extracted and analyzed.【Result】 The mean upstream drainage area,length,slope gradient,width,depth,and cross sectional area of ephemeral gullies in the studied plantation were 21.62 m2,16.46 m,19.72°,2.26 m,0.52 m,and 0.58 m2,respectively.Significant correlations were found between the topographic parameters.The upstream drainage area was extremely positively correlated with other parameters except slope (P<0.01),while slope was extremely negatively correlated with upstream drainage area,length and width (P<0.01).The topographic threshold relationship for the ephemeral gully emerging in the P. massoniana plantation can be expressed as tan Se=0.49A-0.06,where Se and A stand for the slope and the upstream drainage area,respectively.【Conclusion】There were significant correlations between morphological parameters of P. massoniana plantation in the Red Soil Hilly Region,and topography factors (steepness and length of slopes) significantly affected the morphological characteristics of ephemeral gullies. |
| Key words: morphological characteristics of ephemeral gullies topographic threshold Pine massoniana plantation Red Soil Hilly Region |
