Characterization of alpine meadow surface crack and its correlation with root-soil properties

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Journal of Arid Land Pub Date : 2024-07-29 DOI:10.1007/s40333-024-0100-5
Yuechen Wu, Haili Zhu, Yu Zhang, Hailong Zhang, Guosong Liu, Yabin Liu, Guorong Li, Xiasong Hu
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Abstract

Quantifying surface cracks in alpine meadows is a prerequisite and a key aspect in the study of grassland crack development. Crack characterization indices are crucial for the quantitative characterization of complex cracks, serving as vital factors in assessing the degree of cracking and the development morphology. So far, research on evaluating the degree of grassland degradation through crack characterization indices is rare, especially the quantitative analysis of the development of surface cracks in alpine meadows is relatively scarce. Therefore, based on the phenomenon of surface cracking during the degradation of alpine meadows in some regions of the Qinghai-Tibet Plateau, we selected the alpine meadow in the Huangcheng Mongolian Township, Menyuan Hui Autonomous County, Qinghai Province, China as the study area, used unmanned aerial vehicle (UAV) sensing technology to acquire low-altitude images of alpine meadow surface cracks at different degrees of degradation (light, medium, and heavy degradation), and analyzed the representative metrics characterizing the degree of crack development by interpreting the crack length, length density, branch angle, and burrow (rat hole) distribution density and combining them with in situ crack width and depth measurements. Finally, the correlations between the crack characterization indices and the soil and root parameters of sample plots at different degrees of degradation in the study area were analyzed using the grey relation analysis. The results revealed that with the increase of degradation, the physical and chemical properties of soil and the mechanical properties of root-soil composite changed significantly, the vegetation coverage reduced, and the root system aggregated in the surface layer of alpine meadow. As the degree of degradation increased, the fracture morphology developed from “linear” to “dendritic”, and eventually to a complex and irregular “polygonal” pattern. The crack length, width, depth, and length density were identified as the crack characterization indices via analysis of variance. The results of grey relation analysis also revealed that the crack length, width, depth, and length density were all highly correlated with root length density, and as the degradation of alpine meadows intensified, the underground biomass increased dramatically, forming a dense layer of grass felt, which has a significant impact on the formation and expansion of cracks.

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高山草甸表面裂缝的特征及其与根土特性的相关性
量化高山草甸的表面裂缝是研究草原裂缝发展的前提和关键环节。裂缝表征指数对复杂裂缝的定量表征至关重要,是评估裂缝程度和发展形态的重要因素。迄今为止,通过裂缝表征指数评价草原退化程度的研究还很少见,尤其是对高寒草甸表面裂缝发育的定量分析更是少之又少。因此,基于青藏高原部分地区高寒草甸退化过程中的表面裂缝现象,我们选择了中国青海省门源回族自治县煌城蒙古族乡的高寒草甸作为研究区域,利用无人机传感技术获取了不同退化程度(轻度、中度和重度)的高寒草甸表面裂缝的低空图像、通过解读裂缝长度、长度密度、分支角度和洞穴(鼠洞)分布密度,并结合现场裂缝宽度和深度测量结果,分析表征裂缝发展程度的代表性指标。最后,利用灰色关系分析法分析了裂缝特征指数与研究区不同退化程度样地的土壤和根系参数之间的相关性。结果表明,随着退化程度的加剧,土壤的理化性质和根土复合体的力学性质发生了显著变化,植被覆盖率降低,根系在高寒草甸表层聚集。随着降解程度的加剧,裂缝形态由 "线状 "发展为 "树枝状",最终形成复杂而不规则的 "多边形"。通过方差分析,确定了裂缝长度、宽度、深度和长度密度作为裂缝特征指数。灰色关系分析结果还显示,裂缝长度、宽度、深度和长度密度均与根长密度高度相关,随着高山草甸退化的加剧,地下生物量急剧增加,形成了致密的草毡层,对裂缝的形成和扩展有重要影响。
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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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