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Nutrients of green and senesced leaves of a Robinia pseudoacacia plantation along a latitudinal gradient on the Loess Plateau,China

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Journal of Forestry Research 2021年第6期32卷 2499-2506页

作者： Quanchao Zeng Yang Liu Jiajia Yang Yanan Chen Lusha Ma Shaoshan An College of Resources and Environment Huazhong Agricultural UniversityWuhan430070People’s Republic of China State Key Laboratory of Soil Erosion and Dryland Farming On the Loess Plateau Northwest A&F UniversityYangling712100ShaanxiPeople’s Republic of China

Plantations have been widely established to improve ecosystem services and *** locust,Robinia pseudoacacia *** a common,widely planted species to control soil erosion on the Loess *** studies have focused on economic values but the interactions between soil and plant carbon(C),nitrogen(N)and phosphorus(P)remain *** variations of soil,green and senesced leaf C,N and P levels in *** along a latitudinal gradient is useful to understanding its ecological *** results show that soil C,N and senesced leaf N and P significantly decreased with an increase in latitude,but there were no significant changes in the senesced leaf C and soil *** resorption efficiency of N was related with latitude and soil N levels,and the relation between green leaf N and soil N was *** relations suggest that soil N was the key in affecting green leaf N *** higher latitudes,senesced leaves had lower N levels associated with higher N resorption efficiency to maintain a stable N content in green *** a decrease of soil N,*** can enhance N resorption efficiency to meet the demand of ***,it is an important species for reforestation,especially in nutrient-poor environments.

关键词： Green leaves senesced leaves Resorption efficiency Robinia pseudoacacia Loess plateau Vegetation restoration

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Drought events influence nutrient canopy exchanges and green leaf partitioning during senescence in a deciduous forest

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Forest Ecosystems 2024年第1期11卷 110-119页

作者： J.Touche C.Calvaruso P.De Donato M.-P.Turpault INRAE BEFF-54000NancyFrance UMR 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events expected in the coming decades in Western Europe may disturb forest biogeochemical cycles and create nutrient deficiencies in *** possible origin of nutrient deficiency is the disturbance of the partitioning of the green leaf pool during the leaf senescence period between resorption,foliar leaching and senesced ***,the effects of drought events on this partitioning and the consequences for the maintenance of tree nutrition are poorly *** experiment in a beech forest in Meuse(France)was conducted to assess the effect of drought events on nutrient canopy exchanges and on the partitioning of the green leaf pool during the leaf senescence *** aim was to identify potential nutritional consequences of droughts for *** nutrient dynamics,including resorption,chemistry of green and senesced leaves,foliar absorption and leaching in mature beech stands from 2012 to 2019 allowed us to compare the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by almost a third of the potassium(K)partitioning to resorption(*** efficiency),thus reducing the K reserve in trees for the next growing *** result suggests that with the increased drought frequency and intensity expected for the coming decades,there will be a risk of potassium deficiency in trees,as already observed in a rainfall exclusion experiment on the same study *** foliar leaching and higher parititioning to the senesced leaves for K and phosphorus(P)were also *** addition,a slight increase in nitrogen(N)resorption efficiency occurred during dry years which is more likely to improve tree *** calcium(Ca)negative resorption decreased,with no apparent consequence in our study *** results show that nutrient exchanges in the canopy and the partitioning of the green leaf

关键词： Natural drought Beech forest Canopy Resorption Foliar leaching senesced leaves Nutrition

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Resorption efficiency of leaf nutrients in woody plants on Mt. Dongling of Beijing, North China

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Journal of Plant Ecology 2015年第5期8卷 530-538页

作者： Jianhua Zhang Zhiyao Tang Yongkai Luo Xiulian Chi Yahan Chen Jingyun Fang Haihua Shen State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesNo.20 NanxincunXiangshanBeijing 100093China University of Chinese Academy of Sciences No.19A Yuquan RoadShijingshan DistrictBeijing 100049China Department of Ecology College of Urban and Environmental Sciences and Key Laboratory for Earth Surface ProcessesPeking UniversityNo.5 Yiheyuan RoadHaidian DistrictBeijing 100871China

Aims To explore resorption efficiency of nitrogen(NrE)and phosphorus(PrE)of woody plants in relation to soil nutrient availability,climate and evolutionary history,in North *** We measured concentrations of nitrogen([N])and phosphorus([P])in both full expanded mature green and senescent leaves of the same individuals for 88 woody species from 10 sites of ***,beijing,*** built a phylogenetic tree for all these species and compared NrE and PrE among life forms(trees,shrubs and woody lianas)and between functional groups(N-fixers and non-N-fixers).We then explored patterns of NrE and PrE along gradients of mean annual temperature(MAT),soil inorganic N and available P,and phylogeny using a general linear *** Findingsmass-based NrE(NrEm)and PrE(PrEm)averaged 57.4 and 61.4%,respectively,with no significant difference among life forms or functional *** NrEm nor PrEm exhibited significant phylogenetic signals,indicating that NrEm and PrEm were not phylogenetically *** was not related to[N]in green leaves;PrEm was positively correlated with[P]in green leaves;however,this relationship disappeared for different *** decreased with[N]in senescent leaves,PrEm decreased with[P]in senescent leaves,for all species combined and for trees and *** decreased with soil inorganic N for all species and for shrubs;PrEm did not exhibit a significant trend with soil available P for all species or for different plant *** NrEm nor PrEm was significantly related to MAT for overall species and for species of different groups.

关键词： nitrogen concentration phosphorus concentration senesced leaves nitrogen resorption efficiency phosphorus resorption efficiency soil nutrient climate

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