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Soil labile organic carbon impacts C:N:P stoichiometry in urban park green spaces depending on vegetation types and time after planting
Applied Soil Ecology ( IF 4.8 ) Pub Date : 2021-02-12 , DOI: 10.1016/j.apsoil.2021.103926
Rong Huang , Ting Lan , Xi Song , Juan Li , Jing Ling , Ouping Deng , Changquan Wang , Xuesong Gao , Qiquan Li , Xiaoyan Tang , Qi Tao , Min Zeng

Soil nutrient stoichiometry, expressed as the ratios of carbon (C), nitrogen (N), phosphorus (P) in soil, determines the biogeochemical processes of elements in terrestrial ecosystems. Soil labile organic carbon (LOC) is that active component of SOC characterized by rapid turnover times, which links soil organic carbon (SOC) sequestration to C emission. Surprisingly, however, the linkage between soil C:N:P stoichiometry and soil LOC components remains unknown, especially in urban park green spaces. To fill this gap, the soils of dominant vegetation (deciduous forest, evergreen forest and lawn) at three different time after planting (5, 10, and 15 years) in three urban parks of Chengdu megacity were collected, and their soil C:N:P ratios and LOC components were analyzed. Results showed that soil C:N:P ratios were significantly influenced by the elapsed time since vegetation planting. The contents of LOC components (dissolved organic carbon (DOC), microbial biomass carbon (MBC), readily oxidizable carbon (ROC)) all decreased with the more time after planting and they were higher in the soils of deciduous and evergreen forests than lawn vegetation. Soil C:N:P ratios were significantly correlated with LOC components instead of soil TOC, suggesting a sensitive response of soil C:N:P stoichiometry to the dynamics of soil LOC components. Overall, different vegetation types and the time of respective plant-soil interactions regulate the dynamics of soil LOC components, thereby promoting the heterogeneity of soil C:N:P stoichiometry.



中文翻译:

土壤挥发性有机碳对城市公园绿地中C:N:P化学计量的影响取决于植被类型和种植后的时间

土壤养分化学计量表示为土壤中碳(C),氮(N),磷(P)的比值,决定了陆地生态系统中元素的生物地球化学过程。土壤不稳定有机碳(LOC)是SOC的活性成分,具有快速周转时间的特征,它将土壤有机碳(SOC)的固存与碳排放联系在一起。然而,令人惊讶的是,土壤C:N:P化学计量与土壤LOC成分之间的联系仍然未知,尤其是在城市公园的绿色空间中。为了填补这一空白,在成都大城市的三个城市公园种植(5、10和15年)后的三个不同时间收集了主要植被(落叶林,常绿森林和草坪)的土壤,并确定了土壤C:N :P比率和LOC成分进行了分析。结果表明,土壤碳氮比:自种植植被以来,磷的比例受时间的影响很大。种植后的时间越长,LOC成分(可溶性有机碳(DOC),微生物生物量碳(MBC),易氧化碳(ROC))的含量均下降,并且在落叶和常绿森林土壤中的含量高于草坪植被。 。土壤C:N:P的比例与LOC组分而不是土壤TOC显着相关,表明土壤C:N:P的化学计量对土壤LOC组分的动力学具有敏感的响应。总体而言,不同的植被类型和各个植物-土壤相互作用的时间调节了土壤LOC组分的动力学,从而促进了土壤C:N:P化学计量的异质性。种植后的时间越长,微生物生物量碳(MBC),易氧化碳(ROC)均下降,并且在落叶林和常绿林中的土壤中的微生物生物量碳(MBC)高于草坪植被。土壤C:N:P的比例与LOC组分而不是土壤TOC显着相关,表明土壤C:N:P的化学计量对土壤LOC组分的动力学具有敏感的响应。总体而言,不同的植被类型和各个植物-土壤相互作用的时间调节了土壤LOC组分的动力学,从而促进了土壤C:N:P化学计量的异质性。种植后的时间越长,微生物生物量碳(MBC),易氧化碳(ROC)均下降,并且在落叶林和常绿林中的土壤中的微生物生物量碳(MBC)高于草坪植被。土壤C:N:P的比例与LOC组分而不是土壤TOC显着相关,表明土壤C:N:P的化学计量对土壤LOC组分的动力学具有敏感的响应。总体而言,不同的植被类型和各个植物-土壤相互作用的时间调节了土壤LOC组分的动力学,从而促进了土壤C:N:P化学计量的异质性。磷的比例与LOC组分而不是土壤TOC显着相关,表明土壤C:N:P化学计量对土壤LOC组分动力学的敏感响应。总体而言,不同的植被类型和植物与土壤相互作用的时间调节了土壤LOC组分的动力学,从而促进了土壤C:N:P化学计量的异质性。磷的比例与LOC组分而不是土壤TOC显着相关,表明土壤C:N:P化学计量对土壤LOC组分动力学的敏感响应。总体而言,不同的植被类型和各个植物-土壤相互作用的时间调节了土壤LOC组分的动力学,从而促进了土壤C:N:P化学计量的异质性。

更新日期:2021-02-15
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