While most of the present medical implants are nonbiodegradable,biodegradable materials are thought to replace many nonbiodegradable ones in the future,which is dependent on development of the corresponding core techn...While most of the present medical implants are nonbiodegradable,biodegradable materials are thought to replace many nonbiodegradable ones in the future,which is dependent on development of the corresponding core techniques of biomaterials[1-4].Much progress has been made in the field of biodegradable materials during the last decade[5-7].展开更多
以江西井冈山国家级自然保护区内的罗浮栲为研究对象,利用典型样地选择、每木检尺及树干解析等方法,对罗浮栲的生长过程及各器官生物量分配情况进行了初步研究。结果表明:罗浮栲胸径连年生长量为0~10、30~40 a,胸径生长迅速,连...以江西井冈山国家级自然保护区内的罗浮栲为研究对象,利用典型样地选择、每木检尺及树干解析等方法,对罗浮栲的生长过程及各器官生物量分配情况进行了初步研究。结果表明:罗浮栲胸径连年生长量为0~10、30~40 a,胸径生长迅速,连年生长量高峰达0.585 cm,60 a 胸径达到27.2 cm;罗浮栲高生长量在30 a 达到9.80 m,成为优势木;罗浮栲材积生长量在0~20 a 生长缓慢,20~60 a 一直处于快速生长阶段,连年生长量60 a 达到0.0226 m3;罗浮栲平均生长量与连年生长量曲线没有相交,说明罗浮栲到60 a 还未达到数量成熟龄。罗浮栲的生长发育分3个时期,0~20 a 为幼龄期,20~50 a 为速生期,50~60 a 为壮龄期。展开更多
文摘While most of the present medical implants are nonbiodegradable,biodegradable materials are thought to replace many nonbiodegradable ones in the future,which is dependent on development of the corresponding core techniques of biomaterials[1-4].Much progress has been made in the field of biodegradable materials during the last decade[5-7].
文摘以江西井冈山国家级自然保护区内的罗浮栲为研究对象,利用典型样地选择、每木检尺及树干解析等方法,对罗浮栲的生长过程及各器官生物量分配情况进行了初步研究。结果表明:罗浮栲胸径连年生长量为0~10、30~40 a,胸径生长迅速,连年生长量高峰达0.585 cm,60 a 胸径达到27.2 cm;罗浮栲高生长量在30 a 达到9.80 m,成为优势木;罗浮栲材积生长量在0~20 a 生长缓慢,20~60 a 一直处于快速生长阶段,连年生长量60 a 达到0.0226 m3;罗浮栲平均生长量与连年生长量曲线没有相交,说明罗浮栲到60 a 还未达到数量成熟龄。罗浮栲的生长发育分3个时期,0~20 a 为幼龄期,20~50 a 为速生期,50~60 a 为壮龄期。