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作 者:饶志国 赵明华 郭文康 石福习 李云霞 刘利丹 赵琳 张赐成[1] 肖雄[1] RAO Zhiguo;ZHAO Minghua;GUO Wenkang;SHI Fuxi;LI Yunxia;LIU Lidan;ZHAO Lin;ZHANG Cicheng;XIAO Xiong(Hunan Provincial Key Laboratory for Eco-Environmental Changes and Carbon Sequestration of the Dongting Lake Basin,College of Geographic Science,Hunan Normal University,Changsha 410081,China;School of Management,Xi'an University of Finance and Economics,Xi’an 710100,China;College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China)
机构地区:[1]湖南师范大学地理科学学院洞庭湖流域生态环境变化与固碳增汇湖南省重点实验室,长沙410081 [2]西安财经大学管理学院,西安710100 [3]江西农业大学林学院,南昌330045
出 处:《地理学报》2024年第9期2324-2340,共17页Acta Geographica Sinica
基 金:国家自然科学基金项目(42171156,42001080)。
摘 要:表层土壤中总有机碳(TOC)与相应上覆植物/植被之间的正/负δ^(13)C偏移量已被广泛报道,并被认为可能是由多种因素(如大气、气候和土壤因素)变化引起的。开展更大空间尺度的研究,可以更好地揭示其主导因素。本文对中国内陆空间跨度数千公里的107个样点的表土和食草动物粪便样品进行了采集,对表土TOC、表土中分离出来的植物残体全样(PL)、食草动物粪便全样(HF)、表土植物残体和食草动物粪便中提取的α纤维素(α-cellulose)开展了δ^(13)C分析测试。数据分析显示,表土TOC与表土中植物残体全样之间的δ^(13)C偏移量(Δ^(13)C_(TOC-PL))和食草动物粪便全样与表土中植物残体全样之间的δ^(13)C偏移量(Δ^(13)C_(HF-PL))均与δ^(13)C_(PL)呈负相关关系。同样,食草动物粪便α纤维素与表土中植物残体α纤维素之间的δ^(13)偏移量(Δ^(13)C_(HF-PL-cell))也与δ^(13)C_(PL-cell)呈负相关关系。对这些负相关关系最合理的解释是,在表土中的分解过程和食草动物体内的消化过程中,C_(4)植物的分解/消化速度比C_(3)植物更快。研究结果表明,基于现代表土、沉积物和动物残骸δ^(13)C数据估算的C_(4)植物相对丰度,可能被普遍低估,在以后的相关研究当中应当予以适当考虑和评估。The positive or negativeδ^(13)C shifts between total organic carbon(TOC)in surface soils and the corresponding overlying plants/vegetation have been widely reported and are thought to result from various factors,such as atmospheric,climatic,and soil changes.Conducting studies on a larger spatial scale can better reveal the dominant factors.In this study,107 surface soil and herbivore fecal samples were collected across several thousand kilometers of inland China.δ^(13)C analyses were performed on surface soil TOC,bulk plant litter separated from surface soil(PL),bulk herbivore feces(HF),andα-cellulose extracted from both surface soil plant litter and herbivore feces.Data analysis showed that theδ^(13)C shift between surface soil TOC and bulk plant litter(Δ^(13)C_(TOC-PL))and theδ^(13)C shift between bulk herbivore feces and bulk plant litter in surface soils(Δ^(13)C_(HF-PL))both exhibited a negative correlation withδ^(13)C_(PL).Similarly,theδ^(13)C shift between herbivore fecesα-cellulose and surface soil plantα-cellulose(Δ^(13)C_(HF-PL-cell))also showed a negative correlation withδ^(13)C_(PL-cell).The most reasonable explanation for these negative correlations is that during decomposition in surface soils and digestion within herbivores,C_(4) plants decompose/digest faster than C_(3) plants.The findings suggest that the relative abundance of C_(4) plants,estimated based on modern surface soils,sediments,and animal remainsδ^(13)C data,may have been commonly underestimated,and this should be appropriately considered and evaluated in future studies.
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