中国亚热带地区沟壑侵蚀决定因素的空间变化

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE
Zheng Liu , Shu Zhang , Yujie Wei , Yong Zhang , Tingting Cui , Haodan Huang , Hao Lu , Liqi Jiao , Lei Xiao , Chongfa Cai
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引用次数: 0

摘要

沟壑侵蚀是土壤固有特性和外部地质环境因素综合作用的结果,对全球经济发展和生态安全构成巨大威胁。以往对沟壑成因的研究主要针对特定的地点、案例或区域,对其空间变化的系统调查十分有限。本研究以中国南方七省的沟壑清查为基础,利用频比模型研究了 15 个潜在致灾因子阈值的空间变化,并利用 Boruta 算法分析了这些因子对沟壑侵蚀的贡献。结果表明,冲沟密度总体上由北向南递增,在特定范围内呈集群分布,但各潜在因子的阈值略有差异。特别是,沟谷的形成主要受多年平均降雨侵蚀率、多年平均降雨量和人口密度的影响。然而,这些因素对沟壑侵蚀的相对重要性表现出明显的空间异质性。从北到南,降雨侵蚀率(8.25 %-13.56 %)、降雨量(8.62 %-12.01 %)和坡度(0.35 %-1.22 %)的相对重要性增加,而坡度(2.93 %-6.24 %)、温度(5.23 %-8.89 %)、归一化差异植被指数(NDVI)(5.25 %-7.80 %)和植被覆盖率(FVC)(4.11 %-7.23 %)的相对重要性降低。总体而言,气候因素对沟谷侵蚀的影响自北向南呈上升趋势,而地形和植被覆盖度对沟谷侵蚀的影响在同一梯度上呈下降趋势。这些发现将有助于更好地控制中国南方的沟蚀。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatial variation of gully erosion determinants across subtropical regions of China

Gully erosion, with an enormous threat to global economic development and ecological security, results from the comprehensive effect of soil inherent properties and external geo-environmental factors. Previous studies on gully causative factors were mainly conducted on a specific site, case, or region, and limited systematic investigation has been performed on their spatial variation. Based on gully inventory in the seven provinces of southern China, this study investigated the spatial variation of thresholds for fifteen potential causative factors by the frequency ratio model, and analyzed the contribution of these factors to gully erosion by the Boruta algorithm. The results showed that gully density generally increased from north to south, characterized by a clustered distribution within a specific range, but the threshold of each potential factor exhibited a slight difference. Particularly, gully formation was predominantly influenced by multi-year average rainfall erosivity, multi-year average rainfall, and population density. However, the relative importance of these factors to gully erosion showed significant spatial heterogeneity. The relative importance increased from north to south for the factors of rainfall erosivity (8.25 %-13.56 %), rainfall (8.62 %-12.01 %), and slope aspect (0.35 %-1.22 %), but decreased for the factors of slope gradient (2.93 %-6.24 %), temperature (5.23 %-8.89 %), normalized difference vegetation index (NDVI) (5.25 %-7.80 %), and fraction vegetation coverage (FVC) (4.11 %-7.23 %). Overall, climatic factors exhibited an increasing contribution to gully erosion from north to south, whereas the influence of topography and vegetation coverage decreased along the same gradient. These findings will facilitate a better gully erosion control in southern China.

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来源期刊
Soil & Tillage Research
Soil & Tillage Research 农林科学-土壤科学
CiteScore
13.00
自引率
6.20%
发文量
266
审稿时长
5 months
期刊介绍: Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.
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