摘要
鉴于巨柏目前的濒危状况,通过对巨柏天然分布的3个居群(雅鲁藏布江朗县段、米林县、林芝县)进行野外观察和测量以及TTC法种子活力测定,研究了巨柏结实状况、种子形态特征、种实受害和种子活力、出芽率等与濒危的关系,结果表明:巨柏成熟个体有70%～80%不结实或结实极少,健康球果平均含种子58粒;树体大多受樵采危害,种实受病虫、鸟鼠危害严重,是导致巨柏濒危的主要外因;种子活力最高只有39.8%,平均只达到34.6%,远远低于红松、杉木等的种子活力;种子发芽率较低,平均只达到32.67%,是导致巨柏濒危的主要内因;种子品质和其所处生境的温湿条件不利于巨柏个体繁殖和种群扩散。
On account of the Cupressus gigantea is in severe danger,The relationship between the endangered conditions and the conditions of bearing fruit, morphological characters, vigor, damaged conditions, germination rate are studied through field investigation and TTC measurement of seed vigor in three groups（ Lang County section in Brahmaputra , Milin and Linzhi County） of C. gigantea in natural conditions. The result shows： 70% - 80% of the mature trees are fruitless or less fruit, and a health cone contains 58 seeds on average; Most trees are harmfully logged, and the seeds are severely injured by diseases, birds and mice. All of these are the exterior factors that induce C. gigantea to be in severe danger. Whereas, the seed vigor is an important internal factor,but the maximum of which is 39.8% and the average is only up to 34.6%, which is far lower than that of Pinus koraiensis and Cunninghamia lanceolata. The low germination is another important internal factor, the average of which is only 32.6%. The seed quality and the habitat conditions of temperature and humidity are bad for the individual reproducing and population dispersion of C. gigantea.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2005年第4期37-41,共5页
Scientia Silvae Sinicae
基金
国家自然科学基金项目(30260020)资助
关键词
巨柏
种子活力
濒危
Cupressus gigantea
seed vigor
being endangered
