万绿河源,山清水秀

绿水青山,是河源最亮丽的名片;生态优良,是河源最突出的优势。行走在河源,映入眼帘的是那漫山的郁郁葱葱,处处绿意盎然。山绕着水,水映着山,碧波荡漾中,几只小木船悠闲的在水面上飘荡,别有一番风情。稻田里,金黄色的稻浪随风起伏,送来缕缕清香;山坡上,累累硕果挂满果树枝头,引得人们食指大动;养殖场内,场区干净整洁,肥肥的猪满圈满     

Effects of litter removal on plant species diversity: a case study in tropical Eucalyptus forest ecosystems in South China

The removal of litterfall in the Eucalyptus plantations in South China affected the plant biodiversity in these ecosystems was found based on the field observation and lab analysis.The protection times of species diversity of three Eucalyptus communities were different (Community Ⅰ with no protection,Community Ⅱ with 7-year-protection,Community Ⅲ with 35-year-protection).The total numbers of species in these communities(from Community Ⅰ to Ⅱ to Ⅲ)are 1,6,and 17,respectively.The tesults showed that the protection of litterfall from being taken out of the ecosystem is important and can increase plant species diversity.This study ombined biomass data,the chemical and physical properties of the soil,and the diversity of microbes in the communities.It is concluded that the mechanism of the effects of litter removal on biodiversity includes three factors:removing the suitable habitat of microbe and animal,decreasing the soil mutrient, and changing the special habitat for the germination and growth of invading plants.These results should have important implications for managing these Eucalyptus forest ecosystems in South China.