Landscape and Soil Erosion Changes Along Different Types of Road Over the Past 30 Years in the Largest Loess Tableland of China

IF 3.6 2区农林科学 Q2 ENVIRONMENTAL SCIENCES

Land Degradation & Development Pub Date : 2024-10-01 DOI:10.1002/ldr.5315

Siqi Yang, Zhao Jin, Mingkui Hao, Chengcheng Jiang, Hao Han, Zhisheng An, Paolo Tarolli

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引用次数: 0

Abstract

Road construction, as a product of modern civilization, can alter landscape patterns and accelerate erosion, especially in the loess tableland area of China with fragile eco‐environment. Different types of road could change land surface and increased soil erosion in different ways, while knowledge about this topic is limited. In this study, our objective is to evaluate the landscape and soil erosion changes along different types of road in the largest loess tableland of China. Results showed that: (1) The land use type became more diverse along the three types of road in 1990–2020, leading to increased landscape fragmentation and spatial heterogeneity. (2) Different types of road had different proportions of soil erosion values. In the expressway and provincial road, the proportion of low soil erosion values (below 100 t ha−1 yr−1) was > 70% in 1990–2020; in the national road, the proportion of low erosion values (below 100 t ha−1 yr−1) was > 50%. (3) In 1990–2020, soil erosion increased with the increase of road‐induced landscape fragmentation along the three types of road. For the expressway, soil erosion value increased from 91.5 to 98.5 t ha−1 yr−1 between 1990 and 2020; for the national road, soil erosion value increased from 174.5 to 184.8 t ha−1 yr−1; and for the provincial road, soil erosion value increased from 93.7 to 97.1 t ha−1 yr−1. (4) Effective soil and water conservation programs could mitigate erosion. Compared with the simulated soil erosion value, the actual soil erosion value decreased along the expressway, national road, and provincial road by 1.21, 3.67, and 2.96 t ha−1 yr−1, respectively, between 2005 and 2020. This study emphasizes the importance of road in aggravating erosion and the effectiveness of soil and water conservation programs in mitigating soil erosion within the loess area.

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过去 30 年中国最大黄土高原不同类型道路沿线的地貌和土壤侵蚀变化

道路建设作为现代文明的产物，会改变地貌形态，加速水土流失，尤其是在生态环境脆弱的中国黄土高原地区。不同类型的道路会以不同的方式改变地表形态并加剧水土流失，但目前对这方面的了解还很有限。本研究旨在评估中国最大的黄土台地上不同类型道路沿线的地貌和水土流失变化。结果表明(1) 1990-2020 年，三种类型道路沿线的土地利用类型变得更加多样化，导致景观破碎化和空间异质性增加。(2）不同类型道路的水土流失值比例不同。在高速公路和省道中，1990-2020 年低水土流失值（低于 100 吨/公顷-年-1）的比例为 70%；在国道中，低水土流失值（低于 100 吨/公顷-年-1）的比例为 50%。(3）1990-2020 年，三类公路沿线的土壤侵蚀随着公路引起的景观破碎化程度的增加而增加。1990-2020年，高速公路水土流失量从91.5吨/公顷-年增加到98.5吨/公顷-年；国道水土流失量从174.5吨/公顷-年增加到184.8吨/公顷-年；省道水土流失量从93.7吨/公顷-年增加到97.1吨/公顷-年。(4）有效的水土保持方案可减轻水土流失。与模拟土壤侵蚀值相比，2005 年至 2020 年高速公路、国道和省道的实际土壤侵蚀值分别减少了 1.21、3.67 和 2.96 t ha-1 yr-1。这项研究强调了道路在加剧水土流失方面的重要性，以及水土保持项目在减轻黄土地区水土流失方面的有效性。

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来源期刊

Land Degradation & Development 农林科学-环境科学

CiteScore

7.70

自引率

8.50%

发文量

379

审稿时长

5.5 months

期刊介绍： Land Degradation & Development is an international journal which seeks to promote rational study of the recognition, monitoring, control and rehabilitation of degradation in terrestrial environments. The journal focuses on: - what land degradation is; - what causes land degradation; - the impacts of land degradation - the scale of land degradation; - the history, current status or future trends of land degradation; - avoidance, mitigation and control of land degradation; - remedial actions to rehabilitate or restore degraded land; - sustainable land management.