Last week, I read news about school bullying with my parents, and it made me feel very sad. School bullying is a serious problem nowadays. It can happen in the classroom or even after school.
Stipagrostis ciliata(Desf.)De Winter is a pastoral C4 grass grown in arid regions.This research work focused on assessing the growth of S.ciliata accessions derived from two different climate regions(a wet arid region...Stipagrostis ciliata(Desf.)De Winter is a pastoral C4 grass grown in arid regions.This research work focused on assessing the growth of S.ciliata accessions derived from two different climate regions(a wet arid region in the Bou Hedma National Park in the central and southern part of Tunisia(coded as WA),and a dry arid region from the Matmata Mountain in the south of Tunisia(coded as DA))under water stress conditions.Specifically,the study aimed to investigate the phenological and physiological responses of potted S.ciliata seedlings under different water treatments:T_(1)(200 mm/a),T_(2)(150 mm/a),T_(3)(100 mm/a)and T_(4)(50 mm/a).Growth phenology,net photosynthesis(Pn),stomatal conductance(gs),midday leaf water potential(Ψmd),predawn leaf water potential(Ψpd),soil water content(SWC)and soil water potential(Ψs)were observed during the water stress cycle(from December 2016 to November 2017).The obtained results showed that the highest growth potential of the two accessions(WA and DA)was recorded under treatment T_(1).The two accessions responded differently and significantly to water stress.Photosynthetic parameters,such as Pn and gs,decreased sharply under treatments T_(2),T_(3)and T_(4)compared to treatment T_(1).The higher water stress increased the R/S ratio(the ratio of root dry biomass to shoot dry biomass),with values of 1.29 and 2.74 under treatment T_(4)for accessions WA and DA,respectively.Principal component analysis(PCA)was applied,and the separation of S.ciliata accessions on the first two axes of PCA(PC1 and PC2)suggested that accession DA was detected in the negative extremity of PC1 and PC2 under treatments T_(1)and T_(2).This accession was characterized by a high number of spikes.For treatments T_(3)and T_(4),both accessions were detected in the negative extremity of PC1 and PC2.They were characterized by a high root dry biomass.Therefore,S.ciliata accessions responded to water stress by displaying significant changes in their behaviours.Accession WA from the Bou Hedma National Park(wet arid region)showed higher drought tolerance than accession DA from the Matmata Mountain(dry arid region).S.ciliata exhibits a significant adaptation capacity for water limitation and may be an important species for ecosystem restoration.展开更多
Through two years of systematic investigation,it was found that Corythucha ciliata occurred in the main streets of Guangde City and spread rapidly to roads and streets of some villages and towns.The investigation foun...Through two years of systematic investigation,it was found that Corythucha ciliata occurred in the main streets of Guangde City and spread rapidly to roads and streets of some villages and towns.The investigation found that C.ciliata could harm indigenous tree species such as Broussonetia papyrifera,and could also quickly occupy the living space of thrips,the original leaf pest of local Platanus acerifolia.Literature review also suggested that the pest would also be a potential threat to indigenous tree species,such as Rhododendron simsii Planch,Prunus cerasifera Ehrhar,etc.Guangde City,located in the middle and lower reaches of the Yangtze River,was sunny,hot and dry in summer from 2021 to 2022.However,C.ciliata had no obvious diapause habits in summer,with strong adaptability.It was easy to control C.ciliata,but was difficult to eradicate the pest.According to the risk analysis index system of dangerous forest pests,the risk value of C.ciliata was determined as R=1.80,belonging to moderately dangerous pest in Guangde.Through quarantine,publicity,winter and summer management measures,the occurrence of C.ciliata was controlled to a certain extent,and the harm and transmission risk of the pest were reduced.展开更多
On the morning of 3 July,Zhou Hongwei,Party branch secretary of Huangnidun Village,visited Zhou Wenping’s home to hear the family’s suggestions regarding the village’s plan to install more street lamps and upgrade ...On the morning of 3 July,Zhou Hongwei,Party branch secretary of Huangnidun Village,visited Zhou Wenping’s home to hear the family’s suggestions regarding the village’s plan to install more street lamps and upgrade public water pipelines.After their meeting,Zhou immediately headed to another family for their opinions.展开更多
1初遇,然然是个12岁的女孩,是偌大的心脏重症监护室(cardiac intensive care unit,CICU)角落里一个孤独而特别的存在。当大厅里的小宝宝们因饥饿而哇哇大哭时,她总是乖巧地待在床位上,静静地玩手机或躺着。每个经过她身边的人,都会好奇...1初遇,然然是个12岁的女孩,是偌大的心脏重症监护室(cardiac intensive care unit,CICU)角落里一个孤独而特别的存在。当大厅里的小宝宝们因饥饿而哇哇大哭时,她总是乖巧地待在床位上,静静地玩手机或躺着。每个经过她身边的人,都会好奇地警上一眼,但是看过之后都会迅速收回目光,因为她的外形实在是让人既心疼又害怕。展开更多
Americans speak fast in their daily conversationsand it is sometimes difficult for ESL/EFL learnersto understand them.This is because they often speakin a“short cut”—a relaxed way evolved throughmany years.Sometime...Americans speak fast in their daily conversationsand it is sometimes difficult for ESL/EFL learnersto understand them.This is because they often speakin a“short cut”—a relaxed way evolved throughmany years.Sometimes they even write in a展开更多
A chimpanzee(大猩猩)in the zoo in Xi'an,Shaanxi Province has given up smoking after 16 years with the help of her keepers(饲养员).The zookeepers,wor- ried about her health,helped 27-year-old“Ai Ai”off tobacco(烟...A chimpanzee(大猩猩)in the zoo in Xi'an,Shaanxi Province has given up smoking after 16 years with the help of her keepers(饲养员).The zookeepers,wor- ried about her health,helped 27-year-old“Ai Ai”off tobacco(烟草)by treating her with entertainment(娱乐)and tasty diets.展开更多
文摘Last week, I read news about school bullying with my parents, and it made me feel very sad. School bullying is a serious problem nowadays. It can happen in the classroom or even after school.
基金This research was supported by Tunisian Minister of Research and High Education in particular Laboratory of Ecosystems and Biodiversity in Arid Land of Tunisia(LEBIOMAT),University of Sfax.
文摘Stipagrostis ciliata(Desf.)De Winter is a pastoral C4 grass grown in arid regions.This research work focused on assessing the growth of S.ciliata accessions derived from two different climate regions(a wet arid region in the Bou Hedma National Park in the central and southern part of Tunisia(coded as WA),and a dry arid region from the Matmata Mountain in the south of Tunisia(coded as DA))under water stress conditions.Specifically,the study aimed to investigate the phenological and physiological responses of potted S.ciliata seedlings under different water treatments:T_(1)(200 mm/a),T_(2)(150 mm/a),T_(3)(100 mm/a)and T_(4)(50 mm/a).Growth phenology,net photosynthesis(Pn),stomatal conductance(gs),midday leaf water potential(Ψmd),predawn leaf water potential(Ψpd),soil water content(SWC)and soil water potential(Ψs)were observed during the water stress cycle(from December 2016 to November 2017).The obtained results showed that the highest growth potential of the two accessions(WA and DA)was recorded under treatment T_(1).The two accessions responded differently and significantly to water stress.Photosynthetic parameters,such as Pn and gs,decreased sharply under treatments T_(2),T_(3)and T_(4)compared to treatment T_(1).The higher water stress increased the R/S ratio(the ratio of root dry biomass to shoot dry biomass),with values of 1.29 and 2.74 under treatment T_(4)for accessions WA and DA,respectively.Principal component analysis(PCA)was applied,and the separation of S.ciliata accessions on the first two axes of PCA(PC1 and PC2)suggested that accession DA was detected in the negative extremity of PC1 and PC2 under treatments T_(1)and T_(2).This accession was characterized by a high number of spikes.For treatments T_(3)and T_(4),both accessions were detected in the negative extremity of PC1 and PC2.They were characterized by a high root dry biomass.Therefore,S.ciliata accessions responded to water stress by displaying significant changes in their behaviours.Accession WA from the Bou Hedma National Park(wet arid region)showed higher drought tolerance than accession DA from the Matmata Mountain(dry arid region).S.ciliata exhibits a significant adaptation capacity for water limitation and may be an important species for ecosystem restoration.
文摘Through two years of systematic investigation,it was found that Corythucha ciliata occurred in the main streets of Guangde City and spread rapidly to roads and streets of some villages and towns.The investigation found that C.ciliata could harm indigenous tree species such as Broussonetia papyrifera,and could also quickly occupy the living space of thrips,the original leaf pest of local Platanus acerifolia.Literature review also suggested that the pest would also be a potential threat to indigenous tree species,such as Rhododendron simsii Planch,Prunus cerasifera Ehrhar,etc.Guangde City,located in the middle and lower reaches of the Yangtze River,was sunny,hot and dry in summer from 2021 to 2022.However,C.ciliata had no obvious diapause habits in summer,with strong adaptability.It was easy to control C.ciliata,but was difficult to eradicate the pest.According to the risk analysis index system of dangerous forest pests,the risk value of C.ciliata was determined as R=1.80,belonging to moderately dangerous pest in Guangde.Through quarantine,publicity,winter and summer management measures,the occurrence of C.ciliata was controlled to a certain extent,and the harm and transmission risk of the pest were reduced.
文摘On the morning of 3 July,Zhou Hongwei,Party branch secretary of Huangnidun Village,visited Zhou Wenping’s home to hear the family’s suggestions regarding the village’s plan to install more street lamps and upgrade public water pipelines.After their meeting,Zhou immediately headed to another family for their opinions.
文摘1初遇,然然是个12岁的女孩,是偌大的心脏重症监护室(cardiac intensive care unit,CICU)角落里一个孤独而特别的存在。当大厅里的小宝宝们因饥饿而哇哇大哭时,她总是乖巧地待在床位上,静静地玩手机或躺着。每个经过她身边的人,都会好奇地警上一眼,但是看过之后都会迅速收回目光,因为她的外形实在是让人既心疼又害怕。
文摘Americans speak fast in their daily conversationsand it is sometimes difficult for ESL/EFL learnersto understand them.This is because they often speakin a“short cut”—a relaxed way evolved throughmany years.Sometimes they even write in a
文摘A chimpanzee(大猩猩)in the zoo in Xi'an,Shaanxi Province has given up smoking after 16 years with the help of her keepers(饲养员).The zookeepers,wor- ried about her health,helped 27-year-old“Ai Ai”off tobacco(烟草)by treating her with entertainment(娱乐)and tasty diets.
