Plant invasion is one of the most serious threats to ecosystems worldwide.When invasive plants with the ability of clonal growth invading or colonizing in new habitat,their interconnected ramets may suffer from hetero...Plant invasion is one of the most serious threats to ecosystems worldwide.When invasive plants with the ability of clonal growth invading or colonizing in new habitat,their interconnected ramets may suffer from heterogeneous light.Effects of clonal integration on allelopathy of invasive plants are poorly understood under heterogeneous light conditions.To investigate the effects of clonal integration on allelopathy of invasive plant Wedelia trilobata under heterogeneous light conditions,a pot experiment was conducted by using its clonal fragments with two successive ramets.The older ramets were exposed to full light,whereas the younger ones were subjected to 20%full light.The younger ramets of each clonal fragment were adjacently grown with a target plant(one tomato seedling)in a pot.Stolon between two successive ramets was either severed or retained intact.In addition,two tomato seedlings(one as target plant)were adjacently grown in a pot as contrast.Compared with severing stolon,biomass accumulation,foliar chlorophyll and nitrogen contents,chlorophyll fluorescence parameters and net photosynthetic rates of the target plants as well as their root length and activity,were significantly decreased when stolon between interconnected ramets of W.trilobata retained intact.Under heterogeneous light conditions,transportation or sharing of carbohydrate between two successive ramets enhanced allelopathy of the young ramets subjected to 20%full light treatment.It is suggested that clonal integration may be important for invasion or colonization of invasive plants with ability of clonal growth under heterogeneous light conditions.展开更多
Aims Biomass allocation to different organs is a fundamental plant ecophysiological process to better respond to changing environments;yet,it remains poorly understood how patterns of biomass allocation respond to nit...Aims Biomass allocation to different organs is a fundamental plant ecophysiological process to better respond to changing environments;yet,it remains poorly understood how patterns of biomass allocation respond to nitrogen(N)additions across terrestrial ecosystems worldwide.Methods We conducted a meta-analysis using 5474 pairwise observations from 333 articles to assess how N addition affected plant biomass and biomass allocation among different organs.We also tested the'ratio-based optimal partitioning'vs.the'isometric allocation,hypotheses to explain potential N addition effects on biomass allocation.Important Findings We found that(i)N addition significantly increased whole plant biomass and the biomass of different organs,but decreased rootrshoot ratio(RS)and root mass fraction(RMF)while no effects of N addition on leaf mass fraction and stem mass fraction at the global scale;(ii)the effects of N addition on ratio-based biomass allocation were mediated by individual or interactive effects of moderator variables such as experimental conditions,plant functional types,latitudes and rates of N addition and(iii)N addition did not affect allometric relationships among different organs,suggesting that decreases in RS and RMF may result from isometric allocation patterns following increases in whole plant biomass.Despite alteration of ratio-based biomass allocation between root and shoot by N addition,the unaffected allometric scaling relationships among different organs(including root vs.shoot)suggest that plant biomass allocation patterns are more appropriately explained by the isometric allocation hypothesis rather than the optimal partitioning hypothesis.Our findings contribute to better understand N-induced effects on allometric relationships of terrestrial plants,and suggest that these ecophysiological responses should be incorporated into models that aim to predict how terrestrial ecosystems may respond to enhanced N deposition under future global change scenarios.展开更多
Resource sharing among connected ramets(i.e.clonal integration)is one of the distinct traits of clonal plants.Clonal integration confers Moso bamboo(Phyllostachys pubescens)a strong adaptability to different environme...Resource sharing among connected ramets(i.e.clonal integration)is one of the distinct traits of clonal plants.Clonal integration confers Moso bamboo(Phyllostachys pubescens)a strong adaptability to different environmental conditions.But the mechanisms of how clonal integration makes Moso bamboo has better performance are still poorly understood.In this study,acropetal and basipetal translocation of photosynthates between Moso bamboo ramets were analyzed separately to investigate how clonal fragments obtain higher benefits under heterogeneous N conditions.Clonal fragments of Moso bamboo consisting of two interconnected mother–daughter ramets were used,each of the ramets was subjected to either with or without N addition.The acropetal and basipetal translocation of ^(13)C-photosynthates was separated via single-ramet ^(13)C-CO_(2)-labeling.Mother ramets translocated more ^(13)C-photosynthates to daughter ramets with N addition,and the translocation of ^(13)C-photosynthates to mother ramets was more pronounced when daughter ramets were treated with N addition.The ^(13)C-photosynthates that were translocated from mother ramets without and with N addition were mainly invested in the leaves and roots of daughter ramets with N addition,from daughter ramets with N addition were mainly invested in the leaves and roots of mother ramets with and without N addition,respectively.These results suggest that mother ramets preferentially invest more resources in nutrient-rich daughter ramets,and that daughter ramets serve as efficient resource acquisition sites to specialize in acquiring abundant resources based on the resource conditions of mother ramets.Clonal plants can improve their resource acquisition efficiency and maximize the overall performance in this way.展开更多
基金supported by the Key Research and Development Program of Sichuan Province(19ZDYF).
文摘Plant invasion is one of the most serious threats to ecosystems worldwide.When invasive plants with the ability of clonal growth invading or colonizing in new habitat,their interconnected ramets may suffer from heterogeneous light.Effects of clonal integration on allelopathy of invasive plants are poorly understood under heterogeneous light conditions.To investigate the effects of clonal integration on allelopathy of invasive plant Wedelia trilobata under heterogeneous light conditions,a pot experiment was conducted by using its clonal fragments with two successive ramets.The older ramets were exposed to full light,whereas the younger ones were subjected to 20%full light.The younger ramets of each clonal fragment were adjacently grown with a target plant(one tomato seedling)in a pot.Stolon between two successive ramets was either severed or retained intact.In addition,two tomato seedlings(one as target plant)were adjacently grown in a pot as contrast.Compared with severing stolon,biomass accumulation,foliar chlorophyll and nitrogen contents,chlorophyll fluorescence parameters and net photosynthetic rates of the target plants as well as their root length and activity,were significantly decreased when stolon between interconnected ramets of W.trilobata retained intact.Under heterogeneous light conditions,transportation or sharing of carbohydrate between two successive ramets enhanced allelopathy of the young ramets subjected to 20%full light treatment.It is suggested that clonal integration may be important for invasion or colonization of invasive plants with ability of clonal growth under heterogeneous light conditions.
基金This research was financially supported by the National Natural Science Foundation of China(31922052,31800373,32022056 and 31800521).
文摘Aims Biomass allocation to different organs is a fundamental plant ecophysiological process to better respond to changing environments;yet,it remains poorly understood how patterns of biomass allocation respond to nitrogen(N)additions across terrestrial ecosystems worldwide.Methods We conducted a meta-analysis using 5474 pairwise observations from 333 articles to assess how N addition affected plant biomass and biomass allocation among different organs.We also tested the'ratio-based optimal partitioning'vs.the'isometric allocation,hypotheses to explain potential N addition effects on biomass allocation.Important Findings We found that(i)N addition significantly increased whole plant biomass and the biomass of different organs,but decreased rootrshoot ratio(RS)and root mass fraction(RMF)while no effects of N addition on leaf mass fraction and stem mass fraction at the global scale;(ii)the effects of N addition on ratio-based biomass allocation were mediated by individual or interactive effects of moderator variables such as experimental conditions,plant functional types,latitudes and rates of N addition and(iii)N addition did not affect allometric relationships among different organs,suggesting that decreases in RS and RMF may result from isometric allocation patterns following increases in whole plant biomass.Despite alteration of ratio-based biomass allocation between root and shoot by N addition,the unaffected allometric scaling relationships among different organs(including root vs.shoot)suggest that plant biomass allocation patterns are more appropriately explained by the isometric allocation hypothesis rather than the optimal partitioning hypothesis.Our findings contribute to better understand N-induced effects on allometric relationships of terrestrial plants,and suggest that these ecophysiological responses should be incorporated into models that aim to predict how terrestrial ecosystems may respond to enhanced N deposition under future global change scenarios.
基金funded by the Fundamental Research Funds for ICBR(1632019006,1632018004)the National Natural Science Foundation of China(31930078,31971461,31670450)the National Key R&D Program of China(2018YFD060010402,2018YFC0507301).
文摘Resource sharing among connected ramets(i.e.clonal integration)is one of the distinct traits of clonal plants.Clonal integration confers Moso bamboo(Phyllostachys pubescens)a strong adaptability to different environmental conditions.But the mechanisms of how clonal integration makes Moso bamboo has better performance are still poorly understood.In this study,acropetal and basipetal translocation of photosynthates between Moso bamboo ramets were analyzed separately to investigate how clonal fragments obtain higher benefits under heterogeneous N conditions.Clonal fragments of Moso bamboo consisting of two interconnected mother–daughter ramets were used,each of the ramets was subjected to either with or without N addition.The acropetal and basipetal translocation of ^(13)C-photosynthates was separated via single-ramet ^(13)C-CO_(2)-labeling.Mother ramets translocated more ^(13)C-photosynthates to daughter ramets with N addition,and the translocation of ^(13)C-photosynthates to mother ramets was more pronounced when daughter ramets were treated with N addition.The ^(13)C-photosynthates that were translocated from mother ramets without and with N addition were mainly invested in the leaves and roots of daughter ramets with N addition,from daughter ramets with N addition were mainly invested in the leaves and roots of mother ramets with and without N addition,respectively.These results suggest that mother ramets preferentially invest more resources in nutrient-rich daughter ramets,and that daughter ramets serve as efficient resource acquisition sites to specialize in acquiring abundant resources based on the resource conditions of mother ramets.Clonal plants can improve their resource acquisition efficiency and maximize the overall performance in this way.