[Objective] The aim was to find out the distribution of Fe, Mn and Cu contents in cashew leaves. [Method] Using the cashew orchard with stable yield in Hainan as the objects, the sampling sites were arranged systemati...[Objective] The aim was to find out the distribution of Fe, Mn and Cu contents in cashew leaves. [Method] Using the cashew orchard with stable yield in Hainan as the objects, the sampling sites were arranged systematically, and all leaf samples were collected during the annual growth period, so as to analyze the con- tents of trace elements of Fe, Mn and Cu in cashew leaves, as well as to clarify the distribution rules of Fe, Mn and Cu contents in cashew leaves. [Result] The contents of Fe, Mn and Cu in cashew leaves were related with the annual growing period that in October, when the growth of cashew tree became active to accumu- late nutrients for the following bud differentiation and fruit growth, the contents of trace elements in the leaves increased gradually, while in March of the next year, when the fruit-setting consumed a large amount of nutrients, the contents of trace elements in the leaves decreased gradually. [Conclusion] This study provided ideas for the management of nutrients in cashew.展开更多
The paper aims to study the impacts and countermeasures of climate change on animal husbandry in Qinghai plateau and its surrounding area,and evaluate the effect of countermeasures.Results showed that：First,the annua...The paper aims to study the impacts and countermeasures of climate change on animal husbandry in Qinghai plateau and its surrounding area,and evaluate the effect of countermeasures.Results showed that：First,the annual mean temperature,annual mean maximum temperature and annual mean minimum temperature showed an increasing trend in Qinghai plateau during the time from 1961 to 2008; the annual precipitation had not obvious change,but the obvious feature of seasonal change; wind speed and sunshine hours showed a decreasing trend during the time from 1961 to 2008.Secondly,under the current climate condition,grassland productivity showed a decreasing trend,and the grassland theoretical capacity affected by grassland productivity decreased too; warm winter was in favor of livestock overwintering safely,which resulted in a high level of the survival rate of young stock; temperature increasing and precipitation decreasing were beneficial to the fatness of livestock,but the meat yield of livestock was affected by some negative factors such as grassland degradation; livestock diseases had a close relationship with weather condition,and adverse weather condition may arose many diseases of livestock.Thirdly,in view of the current problems of livestock production,we took a series of countermeasures including grass industry construction,livestock improvement,developing new modes of animal husbandry,control and prevention of stockbreeding diseases and insect pests and recovery of meteorological disasters,which played a important role in promoting grassland productivity,solving the problem of the imbalances between livestock and forage,protecting the ecological environment and improving livestock performance.展开更多
基金Supported by the National Nonprofit Institute Research Grant of CATAS-TCGR(16300320150331630032014032)+1 种基金the Ministry of Agriculture Tropical Crop Germplasm Resources Protection(16RZZY-101)the National Natural Science Foundation of China(31301672)~~
文摘[Objective] The aim was to find out the distribution of Fe, Mn and Cu contents in cashew leaves. [Method] Using the cashew orchard with stable yield in Hainan as the objects, the sampling sites were arranged systematically, and all leaf samples were collected during the annual growth period, so as to analyze the con- tents of trace elements of Fe, Mn and Cu in cashew leaves, as well as to clarify the distribution rules of Fe, Mn and Cu contents in cashew leaves. [Result] The contents of Fe, Mn and Cu in cashew leaves were related with the annual growing period that in October, when the growth of cashew tree became active to accumu- late nutrients for the following bud differentiation and fruit growth, the contents of trace elements in the leaves increased gradually, while in March of the next year, when the fruit-setting consumed a large amount of nutrients, the contents of trace elements in the leaves decreased gradually. [Conclusion] This study provided ideas for the management of nutrients in cashew.
文摘The paper aims to study the impacts and countermeasures of climate change on animal husbandry in Qinghai plateau and its surrounding area,and evaluate the effect of countermeasures.Results showed that：First,the annual mean temperature,annual mean maximum temperature and annual mean minimum temperature showed an increasing trend in Qinghai plateau during the time from 1961 to 2008; the annual precipitation had not obvious change,but the obvious feature of seasonal change; wind speed and sunshine hours showed a decreasing trend during the time from 1961 to 2008.Secondly,under the current climate condition,grassland productivity showed a decreasing trend,and the grassland theoretical capacity affected by grassland productivity decreased too; warm winter was in favor of livestock overwintering safely,which resulted in a high level of the survival rate of young stock; temperature increasing and precipitation decreasing were beneficial to the fatness of livestock,but the meat yield of livestock was affected by some negative factors such as grassland degradation; livestock diseases had a close relationship with weather condition,and adverse weather condition may arose many diseases of livestock.Thirdly,in view of the current problems of livestock production,we took a series of countermeasures including grass industry construction,livestock improvement,developing new modes of animal husbandry,control and prevention of stockbreeding diseases and insect pests and recovery of meteorological disasters,which played a important role in promoting grassland productivity,solving the problem of the imbalances between livestock and forage,protecting the ecological environment and improving livestock performance.
