{"title":"地表花粉组合作为西南土地利用和人为植被变化的指示物:对古生态重建的启示","authors":"Jian Ni , Shixiong Yang , Yumei Li , Yun Zhang","doi":"10.1016/j.catena.2025.109307","DOIUrl":null,"url":null,"abstract":"<div><div>The influence of human activities on vegetation has been extensively documented in sedimentary pollen records, highlighting the importance of understanding the relationship between modern human activities and land use when reconstructing historical vegetation changes using pollen data. How can modern surface pollen from human disturbed vegetation indicate potential vegetation or land use type, however, still need to pay more attention. This research analyzes pollen assemblages derived from 117 surface soil samples collected in Southwest China. It elucidates the characteristics of these pollen assemblages and their source ranges across various land use types, as well as the indicative significance of predominant pollen types in relation to vegetation composition. The findings reveal that regional pollen assemblages are predominantly comprised of <em>Pinus</em>, <em>Tsuga</em>, deciduous <em>Quercus</em>, evergreen <em>Quercus</em>, and <em>Betula</em>, which collectively dominate the assemblages. Notably, there are marked differences in the characteristics of pollen assemblages associated with distinct land use types. Specifically, cultivated lands and plantation forests are mainly dominated by artificially selected plants, while secondary forests are mainly dominated by naturally distributed vegetation. Within a radius of 0–200 m from the sampling locations, significant variability in vegetation composition is observed among different sites, reflecting local vegetation characteristics. Conversely, at distances ranging from 0.2 to 20 km, as the spatial separation between sampling points increases, the disparities in vegetation composition and the proportional representation of various land use types diminish, leading to a more homogeneous landscape. At this spatial scale, the correlation between pollen assemblages and vegetation is significantly strengthened, with vegetation accounting for over 90 % of the pollen composition. Thus, the pollen dominantly reflects the regional vegetation characteristics. These results underscore the importance of thoroughly considering the relationship between the contribution rate of pollen assemblages and the composition of regional vegetation when reconstructing regional vegetation patterns through pollen analysis.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"258 ","pages":"Article 109307"},"PeriodicalIF":5.7000,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Surface pollen assemblages as indicators of land-use and human-induced vegetation changes in Southwest China: implications for palaeoecological reconstructions\",\"authors\":\"Jian Ni , Shixiong Yang , Yumei Li , Yun Zhang\",\"doi\":\"10.1016/j.catena.2025.109307\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The influence of human activities on vegetation has been extensively documented in sedimentary pollen records, highlighting the importance of understanding the relationship between modern human activities and land use when reconstructing historical vegetation changes using pollen data. How can modern surface pollen from human disturbed vegetation indicate potential vegetation or land use type, however, still need to pay more attention. This research analyzes pollen assemblages derived from 117 surface soil samples collected in Southwest China. It elucidates the characteristics of these pollen assemblages and their source ranges across various land use types, as well as the indicative significance of predominant pollen types in relation to vegetation composition. The findings reveal that regional pollen assemblages are predominantly comprised of <em>Pinus</em>, <em>Tsuga</em>, deciduous <em>Quercus</em>, evergreen <em>Quercus</em>, and <em>Betula</em>, which collectively dominate the assemblages. Notably, there are marked differences in the characteristics of pollen assemblages associated with distinct land use types. Specifically, cultivated lands and plantation forests are mainly dominated by artificially selected plants, while secondary forests are mainly dominated by naturally distributed vegetation. Within a radius of 0–200 m from the sampling locations, significant variability in vegetation composition is observed among different sites, reflecting local vegetation characteristics. Conversely, at distances ranging from 0.2 to 20 km, as the spatial separation between sampling points increases, the disparities in vegetation composition and the proportional representation of various land use types diminish, leading to a more homogeneous landscape. At this spatial scale, the correlation between pollen assemblages and vegetation is significantly strengthened, with vegetation accounting for over 90 % of the pollen composition. Thus, the pollen dominantly reflects the regional vegetation characteristics. These results underscore the importance of thoroughly considering the relationship between the contribution rate of pollen assemblages and the composition of regional vegetation when reconstructing regional vegetation patterns through pollen analysis.</div></div>\",\"PeriodicalId\":9801,\"journal\":{\"name\":\"Catena\",\"volume\":\"258 \",\"pages\":\"Article 109307\"},\"PeriodicalIF\":5.7000,\"publicationDate\":\"2025-07-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Catena\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0341816225006095\",\"RegionNum\":1,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catena","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0341816225006095","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Surface pollen assemblages as indicators of land-use and human-induced vegetation changes in Southwest China: implications for palaeoecological reconstructions
The influence of human activities on vegetation has been extensively documented in sedimentary pollen records, highlighting the importance of understanding the relationship between modern human activities and land use when reconstructing historical vegetation changes using pollen data. How can modern surface pollen from human disturbed vegetation indicate potential vegetation or land use type, however, still need to pay more attention. This research analyzes pollen assemblages derived from 117 surface soil samples collected in Southwest China. It elucidates the characteristics of these pollen assemblages and their source ranges across various land use types, as well as the indicative significance of predominant pollen types in relation to vegetation composition. The findings reveal that regional pollen assemblages are predominantly comprised of Pinus, Tsuga, deciduous Quercus, evergreen Quercus, and Betula, which collectively dominate the assemblages. Notably, there are marked differences in the characteristics of pollen assemblages associated with distinct land use types. Specifically, cultivated lands and plantation forests are mainly dominated by artificially selected plants, while secondary forests are mainly dominated by naturally distributed vegetation. Within a radius of 0–200 m from the sampling locations, significant variability in vegetation composition is observed among different sites, reflecting local vegetation characteristics. Conversely, at distances ranging from 0.2 to 20 km, as the spatial separation between sampling points increases, the disparities in vegetation composition and the proportional representation of various land use types diminish, leading to a more homogeneous landscape. At this spatial scale, the correlation between pollen assemblages and vegetation is significantly strengthened, with vegetation accounting for over 90 % of the pollen composition. Thus, the pollen dominantly reflects the regional vegetation characteristics. These results underscore the importance of thoroughly considering the relationship between the contribution rate of pollen assemblages and the composition of regional vegetation when reconstructing regional vegetation patterns through pollen analysis.
期刊介绍:
Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment.
Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.