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Linking nutrient resorption stoichiometry with plant growth under long-term nitrogen addition

Forest Ecosystems 2024年第5期11卷 642-649页

作者： Aijun Xing Haihua Shen Longchao Xu Mengying Zhao Zhengbing Yan Jingyun Fang State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing100093China University of Chinese Academy of Sciences Beijing100049China Institute of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing100871China College of Ecology Taiyuan University of TechnologyShanxi030024China

Increased nitrogen(N)input can potentially lead to secondary phosphorus(P)limitation;however,it remains unclear whether differences in the plant's ability to cope with this P deficiency are related to their growth *** a long-term experiment of N addition in a boreal forest,we explored the potential role of plant nutrient resorption efficiency and its stoichiometry in mediating plant growth responses to increased N *** recorded the cover and measured the concentration and resorption efficiency of leaf N and P as well as the photosynthesis of a grass Deyeuxia angustifolia and a shrub Vaccinium *** cover of the grass *** increased with increasing N addition,while that of the shrub ***-idaea decreased with N addition rate and almost disappeared from the high-level N addition over time.P resorption efficiency(PRE)increased in *** but decreased in ***-idaea with increasing leaf N:P which was increased by N addition for both *** addition,photosynthesis increased linearly with N resorption efficiency(NRE)and PRE but was better explained by NRE:PRE,changing nonlinearly with the ratio in a hump-shaped ***,the variance(CV)of NRE:PRE for ***-idaea(123%)was considerably higher than that for ***(29%),indicating a more stable nutrient resorption stoichiometry of the *** together,these results highlight that efficient P acquisition and use strategy through nutrient resorption processes could be a pivotal underlying mechanism driving plant growth and community composition shifts under N enrichment.

关键词： Nitrogen deposition Understory layer Community shift Nutrient limitation Phosphorus resorption efficiency stoichiometric homeostasis

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High adaptability of Pinus sylvestris *** to drought-induced soil nutrient deficiency

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Ecological Processes 2022年第1期11卷 512-524页

作者： Jingling Zhang Guigang Lin Qiong Zhao De‑Hui Zeng CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Daqinggou Ecological Station Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China School of Resources and Environmental Engineering Anhui UniversityHefei 230601China

Background:Drought can exert a profound influence on soil nutrient availability,and understanding whether and how tree species adapt to this change is a critical priority for predicting the consequence of climate change on forest structure and *** objective of this study was to examine the adaptability of Mongolian pine(Pinus sylvestris ***)to drought‑induced changes in soil nutrient availability from the perspective of root ***:We conducted a 7‑year precipitation manipulation experiment with three levels of throughfall reduction(0%,30%,and 50%)to simulate different drought *** measured soil physicochemical properties and fineroot nutrient concentrations and biomass,and calculated the stoichiometric homeostatic regulation coefficient(1/H)of fine ***:Drought reduced soil organic carbon(C),nitrogen(N),phosphorous(P)and inorganic N concentrations,as well as ratios of total N to total P,and available N to available P in the 0–20 cm soil *** contrast,drought had no significant effect on fine‑root N and P concentrations,and fine‑root biomass in the 0–40 cm soil *** roots displayed high homeostatic regulation coefficients of N(with 1/H values of 0.19 and 0)and P(with 1/H values of 0.33 and 0)concentrations in 0–20 and 20–40 cm soil layers,***:Our results indicate that drought leads to soil nutrient deficiency and the decoupling between N and P cycling,and provide evidence that Mongolian pine has high adaptability to drought‑induced decrease in soil nutrient availability by maintaining great fine‑root biomass to ensure sufficient nutrient uptake.

关键词： C:N:P stoichiometry Fine‑root biomass stoichiometric homeostasis Throughfall reduction

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Is Moss Stoichiometry Influenced by Microtopography in a Boreal Peatland of Northeast China？

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Chinese Geographical Science 2018年第6期28卷 1038-1047页

作者： ZHANG Xinhou MAO Rong SONG Changchun LIU Yan REN Zhaojie Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130102 China Jiangxi Provincial Key Laboratory of Silviculture College of Forestry Jiangxi Agricultural University Nanchang 330045 China College of Life Sciences Chongqing Normal University Chongqing 401331 China Nature Department of Shandong Museum Jinan 250014 China

To examine the effects of microtopography on the stoichiometry of carbon(C), nitrogen(N) and phosphorus(P) in mosses along the hummock-hollow gradient in boreal peatlands, we investigated species-level C?N, C?P and N?P ratios of five mosses(Sphagnum magellanicum, S. perichaetiale, S. palustre, S. girgensohnii and Aulacomnium palustre) in the hummocks, hollows and their intermediate zones, and then assessed community-level spatial patterns in a boreal ombrotrophic peatland of north of the Great Xing'an Mountain, Northeast China. The results show that at the species level, C?N, C?P and N?P ratios of the selected Sphagnum mosses remained stable in the hummock-hollow complexes due to unchanged C, N and P concentrations, whereas the non-Sphagnum moss(A. palustre) in the hummocks and intermediate zones had lower P concentrations and thus greater C?P ratios than that in the hollows. At the community level, moss N concentration and C?N ratio remained constant along the hummock-hollow gradient, whereas hummocks and intermediate zones had higher community-level moss C?P and N?P ratios than hollows because of greater C and lower P concentrations. These findings imply that the effects of microtopography on moss C?N?P stoichiometry are scale-dependent and reveal spatial heterogeneity in C and nutrient dynamics. These results provide a more comprehensive understanding of biogeochemical cycles in boreal peatlands.

关键词： hummock-hollow complex microtopography scale-dependent Sphagnum stoichiometric homeostasis

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Soil microbial respiration is regulated by stoichiometric imbalances: Evidence from a humidity gradient case

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Pedosphere 2023年第6期33卷 905-915页

作者： Jiwei LI Jiangbo XIE Jianzhao WU Yongxing CUI Lingbo DONG Yulin LIU Xuying HAI Yan LI Zhouping SHANGGUAN Kaibo WANG Changhui PENG Lei DENG State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau College of Soil and Water Conservation Science and Engineering(Institute of Soil and Water Conservation)Northwest A&F UniversityYangling 712100China Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water ResourcesYangling 712100China State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityLin'an 311300China Sino-French Institute for Earth System Science College of Urban and Environmental SciencesPeking UniversityBeijing 100871China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China Center of CEF/ESCER Department of Biological ScienceUniversity of Quebec at MontrealMontreal H3C 3P8Canada

Humidity not only affects soil microbial respiration(SMR) directly, but, indirectly by regulating the availability of soil water and nutrients. However,the patterns of direct and indirect effects of humidity on SMR over large precipitation gradients remain unclear, limiting our understanding of the effects of precipitation changes on soil C cycle. Here, we investigated the relationships among humidity, soil nutrients, and SMR by identifying stoichiometric imbalances, microbial elemental homeostasis, and microbial C use efficiency along a precipitation gradient at a continental scale. The relationship between SMR and humidity index(HI) corresponded to a Richard’s curve with an inflection point threshold value of approximately 0.7. Soil microbial respiration increased with increasing humidity in drier areas(HI 0.7). Soil microbial communities regulated their enzyme production to maintain a strong stoichiometric homeostasis in drier areas;enzyme production, microbial biomass, and threshold elemental ratios were non-homeostatic under P limitation in wetter areas, which further contributed to the increase in SMR. Our results identified a moisture constraint on SMR in drier areas and highlighted the importance of nutrient(especially for P) limitations induced by humidity in regulating SMR in wetter areas. Understanding the modulation of SMR via soil enzyme activity may improve the prediction of soil C budget under future global climate change.

关键词： carbon use efficiency ecological stoichiometry microorganisms nutrient limitations precipitation soil enzyme activities stoichiometric homeostasis

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Effects of nitrogen addition on plant-soil-microbe stoichio-metry characteristics of different functional group species in Bothriochloa ischemum community

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Soil Ecology Letters 2022年第4期4卷 362-375页

作者： ZiWen Zhao YanLi Qin Yang Wu WenJing Chen Sha Xue GuoBin Liu State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest A&F UniversityYangling 712100China Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water ResourcesYangling 712100China Key Laboratory of National Forestry and Grassland Administration on Ecological Hydrology and Disaster Prevention in Arid Regions Xi'an University of TechnologyXi'an 710048China

Nitrogen(N)deposition,the source of N input into terrestrial ecosystems,is exhibiting an increasingly serious impact on the biogeochemical cycle and functional stability of *** are an important component of terrestrial ecosystems and play a key role in maintaining terrestrial ecosystem ***,it is critical to understand the effects of nitrogen addition on grassland *** conducted gradientN addition experiments(0,3,6,and 9 g N m^(-2)2 y^(-1))for threeyears ingrassland communities with similar site *** utilized four typical herbaceous plants,including the dominant species Bothriochloa ischemum(***)and companion species Stipa bungeana(***),Artemisia gmelinii(***),and Cleistogenes squarrosa(***),to explore how different plant-soil-microbe systems respond to N *** homeostasis analysis demonstrated that both plants and microbes were strictly ***,the companion species were found to be more susceptible to P dominant ***,aggravated overlap in stoichiometric niches between plant species were observed at the N6 and N9 *** analysis indicated that the vector angle was>45°regardlessof plant species and N levels,suggesting that there was a strong Plimitation in the rhizosphere microbial *** partitioning analysis revealed that the Composite roots exhibited a greater effect(explaining 34.7% of the variation)on the rhizosphere microbes than on the Gramineae,indicating that there may be more intense nutrient competition in its ***,the effects of N addition on species were different a cross functional groups,with a significant positive effect on the Gramineae(***,***,and ***)and a significant negative effecton the Compositae(***),which should be fully considered in the future ecological management and restoration.

关键词： N addition Ecological stoichiometry stoichiometric homeostasis Nutrient limitation stoichiometric niche Plant-soil-microbe system

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