China is one of the largest kenaf production countries in the world, and kenaf is an important fiber crop in our country. With the recognition and finance support from Chinese government, we have got the great achieve...China is one of the largest kenaf production countries in the world, and kenaf is an important fiber crop in our country. With the recognition and finance support from Chinese government, we have got the great achievements in the fields of conservation, evaluation, and utilization of kenaf germplasm. China has got much attention in the word because of having the largest kenaf germplasm gene bank. The germplasm resources of kenaf have played an important role in promoting breeding and development of production in the past years. This paper reviewed the status of kenaf production, collection and conservation, utilization of kenaf germplasm, in the study and utilization of put forward strategies of utilization .This will provide kenaf industry. evaluation, innovation and we also discussed the problems genetic diversity of kenaf, and sustained development and available experiences for the展开更多
Aims With the increase of land-use change,habitat fragmentation has become a major factor affecting plant diversity.Generally,when the adult density is high,the survival rate of conspecific saplings may decline and pr...Aims With the increase of land-use change,habitat fragmentation has become a major factor affecting plant diversity.Generally,when the adult density is high,the survival rate of conspecific saplings may decline and provide more resources and space for other species to maintain a high local species diversity.Therefore,the spatial relationship of conspecific saplings and adults(SRCSA)can regulate plant diversity.However,very few studies have assessed SRCSA within fragmented forests,and we still largely unknown the relationship between SRCSA and species diversity in fragmented landscapes.Methods We calculated the mean strength of SRCSA using the spatial distribution data of saplings and adults with a log-transformed hierarchical offset-power model on 27 islands in a land-bridge island system.The higher strength of SRCSA reflects a more negative relationship between the density of conspecific saplings and adults on an island(i.e.the looser pattern of SRCSA).We tested the relationships among island attributes(i.e.island area,the distance to the mainland—MD,and the distance to the nearest island—ND),SRCSA and species diversity.Important Findings The strength of SRCSA increased with ND.Meanwhile,the species diversity significantly increased with the strength of SRCSA,and island area and the strength of SRCSA independently explained 26%and 6%of variation of species diversity,respectively,and their interactions explained 8%.Shade-intolerant and low-abundant species showed looser patterns of SRCSA.Our study suggests that SRCSA may have the effect of excluding species with a relatively low abundance in isolated island forests,which illustrates the importance of biotic interactions in maintaining plant diversity in fragmented forests.Our results also emphasize that we should consider forest connectivity when testing the conspecific negative density dependence.展开更多
文摘China is one of the largest kenaf production countries in the world, and kenaf is an important fiber crop in our country. With the recognition and finance support from Chinese government, we have got the great achievements in the fields of conservation, evaluation, and utilization of kenaf germplasm. China has got much attention in the word because of having the largest kenaf germplasm gene bank. The germplasm resources of kenaf have played an important role in promoting breeding and development of production in the past years. This paper reviewed the status of kenaf production, collection and conservation, utilization of kenaf germplasm, in the study and utilization of put forward strategies of utilization .This will provide kenaf industry. evaluation, innovation and we also discussed the problems genetic diversity of kenaf, and sustained development and available experiences for the
基金supported by the Key Research and Development Program of Zhejiang Province(No.2017C02028)the National Natural Science Foundation of China(No.31930073,31870401 and 31901104)+1 种基金the National Key Research and Development Project(2018YFE0112800)the Fundamental Research Funds for the Central Universities(2019QNA6002).
文摘Aims With the increase of land-use change,habitat fragmentation has become a major factor affecting plant diversity.Generally,when the adult density is high,the survival rate of conspecific saplings may decline and provide more resources and space for other species to maintain a high local species diversity.Therefore,the spatial relationship of conspecific saplings and adults(SRCSA)can regulate plant diversity.However,very few studies have assessed SRCSA within fragmented forests,and we still largely unknown the relationship between SRCSA and species diversity in fragmented landscapes.Methods We calculated the mean strength of SRCSA using the spatial distribution data of saplings and adults with a log-transformed hierarchical offset-power model on 27 islands in a land-bridge island system.The higher strength of SRCSA reflects a more negative relationship between the density of conspecific saplings and adults on an island(i.e.the looser pattern of SRCSA).We tested the relationships among island attributes(i.e.island area,the distance to the mainland—MD,and the distance to the nearest island—ND),SRCSA and species diversity.Important Findings The strength of SRCSA increased with ND.Meanwhile,the species diversity significantly increased with the strength of SRCSA,and island area and the strength of SRCSA independently explained 26%and 6%of variation of species diversity,respectively,and their interactions explained 8%.Shade-intolerant and low-abundant species showed looser patterns of SRCSA.Our study suggests that SRCSA may have the effect of excluding species with a relatively low abundance in isolated island forests,which illustrates the importance of biotic interactions in maintaining plant diversity in fragmented forests.Our results also emphasize that we should consider forest connectivity when testing the conspecific negative density dependence.
