对海南岛海南龙血树(Dracaena cambodiana Pierre ex Gagnep)生境、人为破坏情况和自然更新能力进行了调查与分析,探讨了其濒危原因。结果表明,海南龙血树属典型的岩石伴生型植物,主要分布在高温少雨地区,常生长在陡峭且裸露的花岗岩或...对海南岛海南龙血树(Dracaena cambodiana Pierre ex Gagnep)生境、人为破坏情况和自然更新能力进行了调查与分析,探讨了其濒危原因。结果表明,海南龙血树属典型的岩石伴生型植物,主要分布在高温少雨地区,常生长在陡峭且裸露的花岗岩或石灰岩的石缝残积土中,或紧贴石壁生长于砂壤土中,其伴生树种以小乔木或灌木为主;由于无节制采挖和生境破坏,海南龙血树野生资源数量已十分有限。自然条件下海南龙血树的更新方式有种子更新、根蘖更新和桩蘖更新,但现有生境条件下无论何种更新方式均无法有效地实现种群的扩大和更新。可见,原生境破坏和无节制采挖是海南龙血树濒危的外因,"濒危生境"造成种子无法萌发或幼苗生长失败,导致种群无法实现自然更新是内因和主要原因。展开更多
In this study,we determined six“hotspots”for avian biodiversity conservation in China.We analyzed the distribution patterns of 183 threatened bird species in China in conjunction with geographical data to produce a ...In this study,we determined six“hotspots”for avian biodiversity conservation in China.We analyzed the distribution patterns of 183 threatened bird species in China in conjunction with geographical data to produce a distribution map that shows the concentrations of threatened species.The six biodiversity hotspots are:the western Tianshan Mountains;the Qilian and Hengduan mountains;southern Anhui,southern Jiangsu,and the Zhejiang Hills;the Songliao Plain and the northern region of the North China Plain;the island of Taiwan;and the island of Hainan.Based on our analysis of a species–habitat matrix,species were determined to be distributed mainly in broadleaved forest,grassland and meadows,urban and agricultural areas,wetlands,and bush.Most species were commonly found to have a range of three to five different habitat types.Apart from the six biodiversity hotspots,six ecological clusters were determined.Protection strategies indicating different levels of habitat priority among the biodiversity hotspots were also recommended.展开更多
文摘对海南岛海南龙血树(Dracaena cambodiana Pierre ex Gagnep)生境、人为破坏情况和自然更新能力进行了调查与分析,探讨了其濒危原因。结果表明,海南龙血树属典型的岩石伴生型植物,主要分布在高温少雨地区,常生长在陡峭且裸露的花岗岩或石灰岩的石缝残积土中,或紧贴石壁生长于砂壤土中,其伴生树种以小乔木或灌木为主;由于无节制采挖和生境破坏,海南龙血树野生资源数量已十分有限。自然条件下海南龙血树的更新方式有种子更新、根蘖更新和桩蘖更新,但现有生境条件下无论何种更新方式均无法有效地实现种群的扩大和更新。可见,原生境破坏和无节制采挖是海南龙血树濒危的外因,"濒危生境"造成种子无法萌发或幼苗生长失败,导致种群无法实现自然更新是内因和主要原因。
基金supported by the CAS President President Grant and IOZ Innovation Program and the National Natural Science Foundation of China 30670276.
文摘In this study,we determined six“hotspots”for avian biodiversity conservation in China.We analyzed the distribution patterns of 183 threatened bird species in China in conjunction with geographical data to produce a distribution map that shows the concentrations of threatened species.The six biodiversity hotspots are:the western Tianshan Mountains;the Qilian and Hengduan mountains;southern Anhui,southern Jiangsu,and the Zhejiang Hills;the Songliao Plain and the northern region of the North China Plain;the island of Taiwan;and the island of Hainan.Based on our analysis of a species–habitat matrix,species were determined to be distributed mainly in broadleaved forest,grassland and meadows,urban and agricultural areas,wetlands,and bush.Most species were commonly found to have a range of three to five different habitat types.Apart from the six biodiversity hotspots,six ecological clusters were determined.Protection strategies indicating different levels of habitat priority among the biodiversity hotspots were also recommended.
