{"id":564,"date":"2009-04-10T08:42:07","date_gmt":"2009-04-10T08:42:07","guid":{"rendered":"http:\/\/envafs.dungnq.local\/2009\/04\/10\/conservation-prospects-for-threatened-vietnamese-tree-species-results-from-a-demographic-study\/"},"modified":"2019-09-26T10:16:35","modified_gmt":"2019-09-26T03:16:35","slug":"conservation-prospects-for-threatened-vietnamese-tree-species-results-from-a-demographic-study","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/en\/2009\/04\/conservation-prospects-for-threatened-vietnamese-tree-species-results-from-a-demographic-study\/","title":{"rendered":"Conservation prospects for threatened Vietnamese tree species results from a demographic study"},"content":{"rendered":"<p>\nConservation prospects for threatened Vietnamese tree species results from a demographic study\n<\/p>\n<p>\nPham Duc Chien, Pieter A.Zidema, Nguyen Hoang Nghia\n<\/p>\n<p align=\"left\">\nGiven that changes in population size are slow, information on future prospects of long-lived tree species is necessarily obtained from demographic models. We studied six threatened tree species in four Vietnamese protected areas: the broad-leaved Annamocarya sinensis, Manglietia fordiana and Parashorea chinensis, and the coniferous Calocedrus macrolepis, Dacrydium elatum and Pinus kwangtungensis. With data from a 2-year field study on recruitment, growth and survival, we constructed matrix models for each species. All species showed continuous regeneration, as indicated by annual seedling recruitment and inverse J-shaped population structures. To evaluate the future prospects of our study species, we calculated three parameters: (1) asymptotic growth rates (k) from matrix models indicated significant population declines of 2&ndash;3%\/year for two species; (2) population trajectories for 50&ndash;100 years showed slight population declines (0&ndash;3%\/year) for five species; and (3) the reproductive period required for an adult tree to replace itself was excessive for three of the six species, suggesting that these species presently have insufficient recruitment.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\nGiven that changes in population size are slow, information on future prospects of long-lived tree species is necessarily obtained from demographic models. We studied six threatened tree species in four Vietnamese protected areas: the broad-leaved Annamocarya sinensis, Manglietia fordiana and Parashorea chinensis, and the coniferous Calocedrus macrolepis, Dacrydium elatum and Pinus kwangtungensis.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/564"}],"collection":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/comments?post=564"}],"version-history":[{"count":1,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/564\/revisions"}],"predecessor-version":[{"id":1640,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/posts\/564\/revisions\/1640"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/media?parent=564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/categories?post=564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/en\/wp-json\/wp\/v2\/tags?post=564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}