Conservation Research On Wild Plant Species With Extremely Small Population In Hubei Province Based On Hegyi Competition Index

Wild plant species with extremely small population refers to the plant species with minimum survival rate and embody the features of narrow or intermittent distribution,long term disturbed living environment which caused by external factors,extremely small and degenerated population,decreasing species number and individuals,and lower survival rate even than the stable survival limit.It is of great practical significance for conservation of wild plant species with extremely small population.In this study,we investigated the habitat and protection status of wild plant species with extremely small population in Hubei Province,and used the hegyi competition index to evaluate their survival status.Based on hegyi competition index,protection measures for each plant species with extremely small population in Hubei Province were puts forward.The main research results are as follows:(1)All the Pinus fenzeliana var.dabeshanensis are distributed in the nature reserve,but there are 2 newfound plants don’t have any additional protection measures,and the ability of its natural regeneration is extremely poor.Metasequoia glyptostroboides are all distributed in the nature reserve and forest farm,but the seeds are still in a certain high collection rate and stolen situation,the natural regeneration status is in good.Michelia wilsonii are all distributed in the nature reserve,but have no extra protection measures,the ability of its natural regeneration is extremely poor.Magnolia pilocarpa are scattered,some are in the nature reserve,both without extra protection measures,the natural regeneration status is good.Safflower magnolia is distributed in the inconvenient traffic,there is no protection measure,there is the phenomenon of stealing and digging.Magnolia wufengensis are distributed in places where transportation is not convenient with no extra protection measure,and there have a stolen situation.Fraxinus hupehensis are distributed in the forest farm,but the protection measure is insufficient,the natural regeneration status is good.Berchemiella wilsonii are living in a nature reserve,but have no additional protection measures,and the natural regeneration status is poor.The Changiostyrax dolichocarpa are distributed in the tourist area within the nature reserve,the protection measures and interference coexist,and the natural regeneration status is poor;the Sinojackia huangmeiensis are in an independent protection zone.The natural regeneration status is in good condition.The Acer miaotaiense are in the Shennongjia nature Reserve,which is susceptible to human disturbance,the natural regeneration ability is poor.Armeniaca hongpingensist is in the Shennongjia nature reserve without additional protection measures,and it is vulnerable to human disturbance,the natural regeneration status is poor.(2)The results of surveyed community showed that there are 68 species of plants in surveyed 4 P.fenzeliana var.dabeshanensis communities,which belonging to58 genera of 38 families,the important values of them are 0.21,0.13,0.32,and 0.08.There are 41 species of plants in the 10 investigated M.glyptostroboides communities,which belonging to 40 genera of 27 families,the important values of them of six communities are 1,and the other important values are 0.29,0.29,0.67,and 0.20.There are 52 species of plants in the 5 surveyed M.wilsonii communities,which belonging to 42 genera of 42 families,the important values of them are 0.10,0.21,0.18,0.26,and 0.14.There are 87 species of plants in the 10 investigated M.pilocarpa communities,which belonging to 57 genera of 45 families,the important values of them are 0.13,0.11,0.24,0.20,0.18,0.12,0.15,0.12,0.11 and 0.17.There are 123 species of plants in the survey of 12 M.wufengensis communities,which belonging to 87 genera of 112 families,the important values of them are 0.35,0.21,0.48,0.40,0.32,0.08,0.24,0.26,0.12,0.23,0.19,and 0.14.There are 44 species of plants in 10 surveyed F.hupehensis communities,which belonging to 42 genera of 33 families,important values of them are 0.53,0.68,0.24,0.61,1.00,1.00,0.88,0.81,0.88,and 0.37.There are 30 species of plants in 2 surveyed B.wilsonii communities,which belonging to 27 genera of 20 families,important values of them are 0.35 and 0.41.There are 18 species of plants in the 1 surveyed C.dolichocarpa community,which belonging to 18 genera of 16 families,the important value of it is0.63.There are 25 species of plants in the 10 surveyed S.huangmeiensis communities,which belonging to 23 genera of 22 families,the important values of them are 0.34,1.00,0.56,0.33,0.63,0.62,1.00,0.11,0.41,and 0.76.There are 24 species of plants in the 1surveyed A.miaotaiense community,which belonging to 22 genera 18 families,the important value of it is 0.08.There are 91 species of plants in the 4 surveyed A.hongpingensis communities,which belonging to 82 genera of 45 families,the important values of them are 0.28,0.40,0.31 and 0.35.(3)The results of community competition research indicated that the mainly competition pressure of P.fenzeliana var.dabeshanensis is interspecific competition,which primarily comes from P.taiwanensis.The mainly competition pressure of M.glyptostroboides is intraspecific competition,other species have less competition pressure on it.The mainly competition pressure of Michelia wilsonii is interspecific competition,which mainly comes from Acer palmatum、Rhododendron stamineum.The mainly competition pressure of M.pilocarpa is interspecific competition,which most comes from Diospyros nitida,Phyllostachys heterocycla;the mainly competition pressure of M.wufengensis is interspecific competition,which primarily comes from Castanea mollissima.The mainly competition pressure of Fraxinus hupehensis is intraspecific competition,other species have less competition pressure on it.The mainly competition pressure of B.wilsonii is interspecific competition,which mainly comes from Ulmus parvifolia,and Carpinus turczaninowii.The mainly competition pressure of C.dolichocarpa is intraspecific competition,other species have less competition pressure on it.The competition pressure of S.huangmeiensis both interspecific and intraspecific competition,which mainly comes from Quercus acutissima and Ilex cornuta.The mainly competition pressure of A.miaotaiense is interspecific competition,which primarily comes from Pterocarya stenoptera.The mainly competition pressure of A.hongpingensis is interspecific competition,which primarily comes from Juglans regia.(4)Accroding to aforementioned resluts,the protect measures for each wild plant species with extremely small population are as follows: For P.fenzeliana var.dabeshanensis,it need strengthen in situ conservation,control pests and diseases,cutdown the surrounding Pinus taiwanensis properly.For M.glyptostroboides,the management measures need strengthen,control the collection rate strictly.For M.wilsonii,implement in situ conservation,and cut the surrounding Acer palmatum properly.For M.pilocarpa,need in situ conservation,or ex situ conservation for the plants that hard to implement in situ conservation,the Diospyros nitida can be properly cut dow.For M.wufengensis,it can establish a protected area to protect,and the surrounding Castanea mollissima need be properly cut.For F.hupehensis,it fits to establish a protected area.For B.wilsonii,need in situ conservation,cut down the surrounding Cercis glabra,and properly prune tree layer.For C.dolichocarpa need near in situ conservation,similar in situ conservation and ex situ conservation.For S.huangmeiensis,need near in situ field conservation,and expand the distribution scope on the basis of in situ protection.For A.miaotaiense,need in situ conservation and a further investigation of its distribution.For A.hongpingensis,need to carry out in-situ protection together with surrounding residents.