The association between the growth and water-use efficiency in three populations of C. odorata in Veracruz Mexico （La Antigua, Misantla and Catemaco） from two agroforestry system sites was studied, one in associatio...The association between the growth and water-use efficiency in three populations of C. odorata in Veracruz Mexico （La Antigua, Misantla and Catemaco） from two agroforestry system sites was studied, one in association with corn and another with pipiain. TRP （transpiration）, gs （stomatal conductivity）, CO2A （CO2 assimilation）, WUE （water use efficiency）, height, coverage and stem diameter were measured. The populafon of La Antigua associated with pipian presented the highest WUE （7.13 μmol CO2 m2-sl/mmol H20 m2.sl）, while the population of Catemaco reached high values （10 μmol CO2 m2 sl/mmol H20 m2-s1） in the site associated with corn, the populations established with corn presented a great growth in height and stem diameter. Based on the physiological responses and growth of the studied populations, the towns of La Antigua and Catemaco may be recommended for the establishment of commercial plantations.展开更多
The paper explores the contribution of different factors affecting water use efficiency(WUE) of each sector and explores ways to improve WUE.A new Multi-Sector and Multi-Factors Logarithmic Mean Divisia Index(MLMDI) d...The paper explores the contribution of different factors affecting water use efficiency(WUE) of each sector and explores ways to improve WUE.A new Multi-Sector and Multi-Factors Logarithmic Mean Divisia Index(MLMDI) decomposition method was developed that enabled the identification of WUE by sector into 11 factors in terms of their order of importance.An application to Beijing at the 19 sector level was made for the period between 2002–2007.The water conservation effects of six measures proposed during the 12th-Five-Year-Plan of Beijing were assessed.It was found that,to decrease the transferred out and export of agriculture products and increasing water prices would be the top two most effective measures to promote water conservation.While the adjustment of direct water use structure would contribute in less significant way,the adjustment of industrial structure would have a negative effect.展开更多
文摘The association between the growth and water-use efficiency in three populations of C. odorata in Veracruz Mexico （La Antigua, Misantla and Catemaco） from two agroforestry system sites was studied, one in association with corn and another with pipiain. TRP （transpiration）, gs （stomatal conductivity）, CO2A （CO2 assimilation）, WUE （water use efficiency）, height, coverage and stem diameter were measured. The populafon of La Antigua associated with pipian presented the highest WUE （7.13 μmol CO2 m2-sl/mmol H20 m2.sl）, while the population of Catemaco reached high values （10 μmol CO2 m2 sl/mmol H20 m2-s1） in the site associated with corn, the populations established with corn presented a great growth in height and stem diameter. Based on the physiological responses and growth of the studied populations, the towns of La Antigua and Catemaco may be recommended for the establishment of commercial plantations.
基金supported by the National Natural Science Foundation of China under Grant Nos.71173210,71473244,and 61273208
文摘The paper explores the contribution of different factors affecting water use efficiency(WUE) of each sector and explores ways to improve WUE.A new Multi-Sector and Multi-Factors Logarithmic Mean Divisia Index(MLMDI) decomposition method was developed that enabled the identification of WUE by sector into 11 factors in terms of their order of importance.An application to Beijing at the 19 sector level was made for the period between 2002–2007.The water conservation effects of six measures proposed during the 12th-Five-Year-Plan of Beijing were assessed.It was found that,to decrease the transferred out and export of agriculture products and increasing water prices would be the top two most effective measures to promote water conservation.While the adjustment of direct water use structure would contribute in less significant way,the adjustment of industrial structure would have a negative effect.
