Spring frost involves low temperatures in spring.Research shows cold snaps can alter herbaceous plants'biomass allocation,impacting grassland ecosystems.However,the exact effects of frost timing and severity remai...Spring frost involves low temperatures in spring.Research shows cold snaps can alter herbaceous plants'biomass allocation,impacting grassland ecosystems.However,the exact effects of frost timing and severity remain unclear.This study simulated spring frost based on characteristics of spring frost on the northern slope of the Tianshan Mountains to examine how alfalfa(Medicago sativa)and ryegrass(Lolium spp.)adjust biomass allocation under varying frost intensities and timings,including interspecific differences in these responses.The findings revealed that(1)compared to the control group(which did not undergo low-temperature treatment),alfalfa was more sensitive to high-intensity spring frost,exhibiting a significant decrease of 13.6%in the root weight ratio and increases of 8.65%and 4.96%in the stem and leaf weight ratios,respectively.In contrast,ryegrass displayed an inverse trend,although the changes were not significant.(2)Early stage spring frost(immediately after thinning)significantly affected alfalfa biomass allocation,leading to an 11.28%decrease in the root weight ratio,whereas it also significant increases of 3.78%the stem weight ratio by 7.51%and leaf weight ratio.In contrast,late stage spring frost(applied on the 17rd day after thinning)had a relatively greater effect on ryegrass,with the root weight ratio increasing by 4.13%and the stem weight ratio decreasing by 4.18%.These findings reveal plants'distinct adaptations to cryogenic stresses,improving our understanding of herbaceous growth responses to extreme weather in arid zones and offering data to support grassland ecosystem services in Xinjiang.展开更多
Understanding the phenology and productivity of Populus species is crucial for effective management and conservation strategies amid climate change.We investigated leaf budbreak timing,susceptibility to cold damage,le...Understanding the phenology and productivity of Populus species is crucial for effective management and conservation strategies amid climate change.We investigated leaf budbreak timing,susceptibility to cold damage,leaf dynamics,and biomass production of 168 Populus genotypes with diverse provenances in the southeastern United States.Our study revealed significant variation in budbreak timing across different taxa and years,with genotypes inheriting traits adapted to their parents’local climates.Temperature emerged as a key factor triggering budbreak,while leaf development depended on other environmental cues such as photoperiod.Notably,budbreak occurred approximately 20 days earlier in 2023 compared to 2022 due to higher accumulated degree days(ADDs).Short-rotation-coppice(SRC)management delayed budbreak by five to ten days.Cold damage was significant in 2023,particularly for genotypes from northern provenances and those with P.maximowiczii parentage.Severe damage was also observed in eastern cottonwood(Populus deltoides×Populus deltoides(D×D))genotypes,despite most having southeastern US parentages.Leaf dynamics,including leaf duration and leaf area index(LAI),varied across taxa and sites,with earlier budbreak correlating with extended growing seasons and increased LAI.Biomass production was intricately linked to phenological events,with earlier budbreak leading to increased biomass production and greater susceptibility to cold damage.Our findings highlight the importance of genetics,environment,and coppicing management in understanding and managing Populus phenology and biomass production.These insights provide valuable guidance for developing effective breeding,conservation,and management strategies for Populus species in the context of climate change.展开更多
基金funded by the Natural Science Foundation of Xinjiang Uygur Autonomous Region(2022D01B234,2023E01006)the Xinjiang Uygur Autonomous Region Young Scientific and Technological Innovation Talents(Top-notch Young Talents)Program.
文摘Spring frost involves low temperatures in spring.Research shows cold snaps can alter herbaceous plants'biomass allocation,impacting grassland ecosystems.However,the exact effects of frost timing and severity remain unclear.This study simulated spring frost based on characteristics of spring frost on the northern slope of the Tianshan Mountains to examine how alfalfa(Medicago sativa)and ryegrass(Lolium spp.)adjust biomass allocation under varying frost intensities and timings,including interspecific differences in these responses.The findings revealed that(1)compared to the control group(which did not undergo low-temperature treatment),alfalfa was more sensitive to high-intensity spring frost,exhibiting a significant decrease of 13.6%in the root weight ratio and increases of 8.65%and 4.96%in the stem and leaf weight ratios,respectively.In contrast,ryegrass displayed an inverse trend,although the changes were not significant.(2)Early stage spring frost(immediately after thinning)significantly affected alfalfa biomass allocation,leading to an 11.28%decrease in the root weight ratio,whereas it also significant increases of 3.78%the stem weight ratio by 7.51%and leaf weight ratio.In contrast,late stage spring frost(applied on the 17rd day after thinning)had a relatively greater effect on ryegrass,with the root weight ratio increasing by 4.13%and the stem weight ratio decreasing by 4.18%.These findings reveal plants'distinct adaptations to cryogenic stresses,improving our understanding of herbaceous growth responses to extreme weather in arid zones and offering data to support grassland ecosystem services in Xinjiang.
基金funded by the USDA National Institute of Food and Agriculture(USDA-NIFA)through the APPS grant(Advancing Populus Pathways in the Southeast,2018-68005-27636)United States Department of Energy(DOE)through the PoSIES(Populus in the Southeast for Integrated Ecosystem Services,DE-EE0009280)USDA-NIFA McIntire Stennis grant(MISZ-067050).
文摘Understanding the phenology and productivity of Populus species is crucial for effective management and conservation strategies amid climate change.We investigated leaf budbreak timing,susceptibility to cold damage,leaf dynamics,and biomass production of 168 Populus genotypes with diverse provenances in the southeastern United States.Our study revealed significant variation in budbreak timing across different taxa and years,with genotypes inheriting traits adapted to their parents’local climates.Temperature emerged as a key factor triggering budbreak,while leaf development depended on other environmental cues such as photoperiod.Notably,budbreak occurred approximately 20 days earlier in 2023 compared to 2022 due to higher accumulated degree days(ADDs).Short-rotation-coppice(SRC)management delayed budbreak by five to ten days.Cold damage was significant in 2023,particularly for genotypes from northern provenances and those with P.maximowiczii parentage.Severe damage was also observed in eastern cottonwood(Populus deltoides×Populus deltoides(D×D))genotypes,despite most having southeastern US parentages.Leaf dynamics,including leaf duration and leaf area index(LAI),varied across taxa and sites,with earlier budbreak correlating with extended growing seasons and increased LAI.Biomass production was intricately linked to phenological events,with earlier budbreak leading to increased biomass production and greater susceptibility to cold damage.Our findings highlight the importance of genetics,environment,and coppicing management in understanding and managing Populus phenology and biomass production.These insights provide valuable guidance for developing effective breeding,conservation,and management strategies for Populus species in the context of climate change.
