{"title":"高寒泥炭地退化加剧土壤氮损失并改变植物氮吸收策略：来自氮同位素的证据","authors":"Xiaodong Zhang, Lijuan Cui, Xin Jia, Liang Yan, Yong Li, Zhongqing Yan, Kerou Zhang, Ao Yang, Yuechuan Niu, Enze Kang, Xiaoming Kang","doi":"10.1186/s40538-025-00835-6","DOIUrl":null,"url":null,"abstract":"<div><h3>Background</h3><p>Nitrogen plays a critical role in sustaining ecosystem functions in peatlands; however, the degradation of approximately 12% of global peatlands substantially alters nitrogen cycling. Although the abundance of stable nitrogen isotopes (δ<sup>15</sup>N) has been widely used to trace nitrogen processes, their patterns and implications across degradation gradients are not well understood. This study examined changes in δ<sup>15</sup>N and their relationships with nitrogen content and environmental factors along a degradation gradient in alpine peatlands, including flooded wetlands, wet meadows, moderately degraded meadows, and severely degraded meadows.</p><h3>Results</h3><p>Soil δ<sup>15</sup>N increased from flooded wetlands to wet meadows and moderately degraded meadows, likely due to increased nitrogen release as the peatlands dried. However, soil δ<sup>15</sup>N declined from moderately to severely degraded meadows, possibly reflecting reduced microbial activity and limited nitrogen transformation under extreme degradation. Across all sites, roots were depleted in <sup>15</sup>N relative to soil, with increasingly negative Δδ<sup>15</sup>N<sub>root–soil</sub> values in more degraded sites, likely driven by shifts in plant community composition and changes in nitrogen uptake strategies. Random forest analysis revealed that the soil water content, phosphorus, and nitrogen availability were the primary factors influencing the soil and plant δ<sup>15</sup>N values, as did <sup>15</sup>N fractionation during plant nitrogen uptake along the degradation gradient.</p><h3>Conclusions</h3><p>Peatland degradation leads to greater soil δ<sup>15</sup>N and increased <sup>15</sup>N depletion from soil to plants, indicating a shift toward more open ecosystem nitrogen dynamics and altered plant nitrogen uptake strategies associated with greater nitrogen losses. These findings provide new insights into the impact of peatland degradation on nitrogen dynamics and demonstrate the effectiveness of δ<sup>15</sup>N as a tool for monitoring changes in nitrogen cycling and availability across degradation levels.</p><h3>Graphical Abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":512,"journal":{"name":"Chemical and Biological Technologies in Agriculture","volume":"12 1","pages":""},"PeriodicalIF":5.2000,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://chembioagro.springeropen.com/counter/pdf/10.1186/s40538-025-00835-6","citationCount":"0","resultStr":"{\"title\":\"Alpine peatland degradation enhances soil nitrogen losses and alters plant nitrogen uptake strategies: evidence from nitrogen isotopes\",\"authors\":\"Xiaodong Zhang, Lijuan Cui, Xin Jia, Liang Yan, Yong Li, Zhongqing Yan, Kerou Zhang, Ao Yang, Yuechuan Niu, Enze Kang, Xiaoming Kang\",\"doi\":\"10.1186/s40538-025-00835-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Background</h3><p>Nitrogen plays a critical role in sustaining ecosystem functions in peatlands; however, the degradation of approximately 12% of global peatlands substantially alters nitrogen cycling. Although the abundance of stable nitrogen isotopes (δ<sup>15</sup>N) has been widely used to trace nitrogen processes, their patterns and implications across degradation gradients are not well understood. This study examined changes in δ<sup>15</sup>N and their relationships with nitrogen content and environmental factors along a degradation gradient in alpine peatlands, including flooded wetlands, wet meadows, moderately degraded meadows, and severely degraded meadows.</p><h3>Results</h3><p>Soil δ<sup>15</sup>N increased from flooded wetlands to wet meadows and moderately degraded meadows, likely due to increased nitrogen release as the peatlands dried. However, soil δ<sup>15</sup>N declined from moderately to severely degraded meadows, possibly reflecting reduced microbial activity and limited nitrogen transformation under extreme degradation. Across all sites, roots were depleted in <sup>15</sup>N relative to soil, with increasingly negative Δδ<sup>15</sup>N<sub>root–soil</sub> values in more degraded sites, likely driven by shifts in plant community composition and changes in nitrogen uptake strategies. Random forest analysis revealed that the soil water content, phosphorus, and nitrogen availability were the primary factors influencing the soil and plant δ<sup>15</sup>N values, as did <sup>15</sup>N fractionation during plant nitrogen uptake along the degradation gradient.</p><h3>Conclusions</h3><p>Peatland degradation leads to greater soil δ<sup>15</sup>N and increased <sup>15</sup>N depletion from soil to plants, indicating a shift toward more open ecosystem nitrogen dynamics and altered plant nitrogen uptake strategies associated with greater nitrogen losses. These findings provide new insights into the impact of peatland degradation on nitrogen dynamics and demonstrate the effectiveness of δ<sup>15</sup>N as a tool for monitoring changes in nitrogen cycling and availability across degradation levels.</p><h3>Graphical Abstract</h3>\\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>\",\"PeriodicalId\":512,\"journal\":{\"name\":\"Chemical and Biological Technologies in Agriculture\",\"volume\":\"12 1\",\"pages\":\"\"},\"PeriodicalIF\":5.2000,\"publicationDate\":\"2025-08-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://chembioagro.springeropen.com/counter/pdf/10.1186/s40538-025-00835-6\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chemical and Biological Technologies in Agriculture\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://link.springer.com/article/10.1186/s40538-025-00835-6\",\"RegionNum\":2,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"AGRICULTURE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical and Biological Technologies in Agriculture","FirstCategoryId":"97","ListUrlMain":"https://link.springer.com/article/10.1186/s40538-025-00835-6","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURE, MULTIDISCIPLINARY","Score":null,"Total":0}
Alpine peatland degradation enhances soil nitrogen losses and alters plant nitrogen uptake strategies: evidence from nitrogen isotopes
Background
Nitrogen plays a critical role in sustaining ecosystem functions in peatlands; however, the degradation of approximately 12% of global peatlands substantially alters nitrogen cycling. Although the abundance of stable nitrogen isotopes (δ15N) has been widely used to trace nitrogen processes, their patterns and implications across degradation gradients are not well understood. This study examined changes in δ15N and their relationships with nitrogen content and environmental factors along a degradation gradient in alpine peatlands, including flooded wetlands, wet meadows, moderately degraded meadows, and severely degraded meadows.
Results
Soil δ15N increased from flooded wetlands to wet meadows and moderately degraded meadows, likely due to increased nitrogen release as the peatlands dried. However, soil δ15N declined from moderately to severely degraded meadows, possibly reflecting reduced microbial activity and limited nitrogen transformation under extreme degradation. Across all sites, roots were depleted in 15N relative to soil, with increasingly negative Δδ15Nroot–soil values in more degraded sites, likely driven by shifts in plant community composition and changes in nitrogen uptake strategies. Random forest analysis revealed that the soil water content, phosphorus, and nitrogen availability were the primary factors influencing the soil and plant δ15N values, as did 15N fractionation during plant nitrogen uptake along the degradation gradient.
Conclusions
Peatland degradation leads to greater soil δ15N and increased 15N depletion from soil to plants, indicating a shift toward more open ecosystem nitrogen dynamics and altered plant nitrogen uptake strategies associated with greater nitrogen losses. These findings provide new insights into the impact of peatland degradation on nitrogen dynamics and demonstrate the effectiveness of δ15N as a tool for monitoring changes in nitrogen cycling and availability across degradation levels.
期刊介绍：
Chemical and Biological Technologies in Agriculture is an international, interdisciplinary, peer-reviewed forum for the advancement and application to all fields of agriculture of modern chemical, biochemical and molecular technologies. The scope of this journal includes chemical and biochemical processes aimed to increase sustainable agricultural and food production, the evaluation of quality and origin of raw primary products and their transformation into foods and chemicals, as well as environmental monitoring and remediation. Of special interest are the effects of chemical and biochemical technologies, also at the nano and supramolecular scale, on the relationships between soil, plants, microorganisms and their environment, with the help of modern bioinformatics. Another special focus is the use of modern bioorganic and biological chemistry to develop new technologies for plant nutrition and bio-stimulation, advancement of biorefineries from biomasses, safe and traceable food products, carbon storage in soil and plants and restoration of contaminated soils to agriculture.
This journal presents the first opportunity to bring together researchers from a wide number of disciplines within the agricultural chemical and biological sciences, from both industry and academia. The principle aim of Chemical and Biological Technologies in Agriculture is to allow the exchange of the most advanced chemical and biochemical knowledge to develop technologies which address one of the most pressing challenges of our times - sustaining a growing world population.
Chemical and Biological Technologies in Agriculture publishes original research articles, short letters and invited reviews. Articles from scientists in industry, academia as well as private research institutes, non-governmental and environmental organizations are encouraged.
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