This paper dealed with the differences between albino and normal seedlings of Calamus nambarensis var.xishuangbanensis in terms of growth and photosynthesis.Thirteen families among 22 families were found to have one t...This paper dealed with the differences between albino and normal seedlings of Calamus nambarensis var.xishuangbanensis in terms of growth and photosynthesis.Thirteen families among 22 families were found to have one to three albinos,the percent of which varying from 0.4 to 2.2 percents,while the percent of albinos among all 22 families was about 0.7 percent.The number of albino leaves and the length of longest leaves were 1.9±0.3 and 22.32±3.49 cm respectively, which were less than that of 2.0±0.0 and 26.09±3.26 cm of normal seedlings,accounting for 95% and 85% of normal seedlings.The albinos hadn’t chlorophyll a,but some chlorophyll b.The total content of chlorophyll was 0.02 mg·g-1FW, much less than that of 8.15 mg·g-1FW of normal seedlings, accounting for 0.2 percent.Whether photosynthesis active radiation（PAR） was 800 μmol·m-2·s-1 or （1 600） μmol·m-2·s-1,the photosynthetic rate of albinos was less than that of normal seedlings,accounting for about 20 percents.The data of net photosynthetic rate of albino evaluatde by the authors were also展开更多
Hainan Island is the biggest supplier of domestic rattan canes in China and is considered the best area to develop rattan plantation in large-scale. This paper discusses the rattan production in Hainan Island on the b...Hainan Island is the biggest supplier of domestic rattan canes in China and is considered the best area to develop rattan plantation in large-scale. This paper discusses the rattan production in Hainan Island on the basis of comprehensively collected information on rattan through interviewing with farmers, middle man, manufacture and official, on-site observation and literatures. The stock of available rattan is more than 25×106kg, but the real production annually is 4×105 kg. The area of rattan plantation established during 2000-2005 was about 10000 hm2, however, they don not produce yet. Four indigenous rattan species （C. Simplicifolius, C. Faberii, C. Tetradactylus, D. margaritae ） and three kinds of exotic canes are mainly utilized in Hainan island. Large quality of canes is treated as timber regulated by government, tax should be paid and a license should be applied from the government if canes are transport out of Hainan Island. The production-to-consumption flow of rattan in Hainan Island was drawn out based on the investigation. Constraints and advantages of the rattan sector in Hainan are identified and recommendations are proposed finally.展开更多
The importance of water on rattan is described in the paper. Up to date, some researches have witnessed that rain determines the distribution and the number of species of rattan in wild, and is helpful to dispersal of...The importance of water on rattan is described in the paper. Up to date, some researches have witnessed that rain determines the distribution and the number of species of rattan in wild, and is helpful to dispersal of rattan seeds with slope. Rattan plays a role in intercepting the splash effect of rain and improves the water holding capacity of soil. The viability of rattan seed decreases quickly with the decrease of water content of seeds, hence to reduce the germination rate of seeds. With enough water, rattan grows more quickly in terms of leaf, leaf area, and stem. Water stress improves the ratio of root to shoot of rattan, and humidity plays a role in the distribution and growth of rattan.展开更多
文摘This paper dealed with the differences between albino and normal seedlings of Calamus nambarensis var.xishuangbanensis in terms of growth and photosynthesis.Thirteen families among 22 families were found to have one to three albinos,the percent of which varying from 0.4 to 2.2 percents,while the percent of albinos among all 22 families was about 0.7 percent.The number of albino leaves and the length of longest leaves were 1.9±0.3 and 22.32±3.49 cm respectively, which were less than that of 2.0±0.0 and 26.09±3.26 cm of normal seedlings,accounting for 95% and 85% of normal seedlings.The albinos hadn’t chlorophyll a,but some chlorophyll b.The total content of chlorophyll was 0.02 mg·g-1FW, much less than that of 8.15 mg·g-1FW of normal seedlings, accounting for 0.2 percent.Whether photosynthesis active radiation（PAR） was 800 μmol·m-2·s-1 or （1 600） μmol·m-2·s-1,the photosynthetic rate of albinos was less than that of normal seedlings,accounting for about 20 percents.The data of net photosynthetic rate of albino evaluatde by the authors were also
基金This study is supported jointly by the 15th National Science and Technology Supporting Project Study and Demonstration of Key Technology to Utilize and Cultivate Rattan Resource Effectively (No.2006BAD19B09)the Science and Technology Project of Guangdong, Selection and Propagation of High-yielding Rattan Family (No. 2006B20201026).
文摘Hainan Island is the biggest supplier of domestic rattan canes in China and is considered the best area to develop rattan plantation in large-scale. This paper discusses the rattan production in Hainan Island on the basis of comprehensively collected information on rattan through interviewing with farmers, middle man, manufacture and official, on-site observation and literatures. The stock of available rattan is more than 25×106kg, but the real production annually is 4×105 kg. The area of rattan plantation established during 2000-2005 was about 10000 hm2, however, they don not produce yet. Four indigenous rattan species （C. Simplicifolius, C. Faberii, C. Tetradactylus, D. margaritae ） and three kinds of exotic canes are mainly utilized in Hainan island. Large quality of canes is treated as timber regulated by government, tax should be paid and a license should be applied from the government if canes are transport out of Hainan Island. The production-to-consumption flow of rattan in Hainan Island was drawn out based on the investigation. Constraints and advantages of the rattan sector in Hainan are identified and recommendations are proposed finally.
文摘The importance of water on rattan is described in the paper. Up to date, some researches have witnessed that rain determines the distribution and the number of species of rattan in wild, and is helpful to dispersal of rattan seeds with slope. Rattan plays a role in intercepting the splash effect of rain and improves the water holding capacity of soil. The viability of rattan seed decreases quickly with the decrease of water content of seeds, hence to reduce the germination rate of seeds. With enough water, rattan grows more quickly in terms of leaf, leaf area, and stem. Water stress improves the ratio of root to shoot of rattan, and humidity plays a role in the distribution and growth of rattan.
