The floristic elements and the geographical distribution are analyzed in thispaper based on statistics of elements of rare and endangered plants in Tibet. The results have beengained as following: (1) According to ...The floristic elements and the geographical distribution are analyzed in thispaper based on statistics of elements of rare and endangered plants in Tibet. The results have beengained as following: (1) According to 'the National Important Wild Conservative Plants List (List1)' and 'the National Important Wild Conservative Plants List (List 1)', there are a total of 54plant species (48 genera and 33 families); (2) The geographical elements are very complicated inTibet with 12 of 15 distribution patterns of genera classified by academician Wu; (3) There areobvious temperate genera with 28 genera accounting for 60. 4% of the total genera; (4) There areabundant endemic species accounting for 18. 52% of total species but poor endemic genera; (5) Thegeographical distribution is uneven and a great of species distribute in the areas between 1 000 mand 3 500 m above sea level; (6) To protect the rare and endangered plants efficiently, sixconservation measures are proposed, and 35 species are suggested for the conservative plants of theautonomous conservation level.展开更多
In-situ study on eleven commercially important species viz; Adiantum capillus-veneris L, Bergenia ciliata (Haw) Sternb, Colchicum luteum Baker, Polygonum amplexicaule D.Den, Cuminum cyminum L, Dioscorea deltoidea Wall...In-situ study on eleven commercially important species viz; Adiantum capillus-veneris L, Bergenia ciliata (Haw) Sternb, Colchicum luteum Baker, Polygonum amplexicaule D.Den, Cuminum cyminum L, Dioscorea deltoidea Wall Kunth,L Morchella esculenta L, Paeonia emodi Wall ex H Kf, Podophyllum hexandrum (Royle) Chatt & Mukh, Valeriana wallichii DC and Viola serpens Wall ex Roxb was conducted in four locations viz; Malam (1 400 to 2 000?m),Bargin (1 700 to 2 300?m),Biakand (1 500 to 2 100?m) and Shinko (2 100 to 2 700?m).The data was recorded from both protected and unprotected sites of each site.Each site had 3 altitudinal sampling point.The density, herbage coverage and fresh biomass were determined in each locations for every species.All the investigated parameters generally showed an increase of 3 to 6 times over unprotected sites in each locations. Morchella esculenta,Dioscorea deltoidea,Colchicum luteum and Podophyllum hexandrum were absent in all unprotected sites while other species had low values in these sites.The investigated parameters of Colchicum luteum,Bergenia ciliata,Paeonioa emodi,Dioscorea deltoidea and Podophyllum hexandrum generally increased with the increasing elevation.Soil analysis,soil and air temperatures were recorded for each site.The air and soil temperature were slightly higher in open areas than in the protected site and showed decrease with increasing elevation.While the soil fertility was relatively high in protected sites as compared to unprotected area.The study shows that protection promotes the growth, distribution and occurrence of medicinal plants.It is possible with the participation of local communities to conserve these resources.展开更多
Agricultural application of rare earth (RE) has been generalized for several decades, and it is involved in crops, vegetables and stock raising in China. However, all the researches on RE mainly focus on the fields su...Agricultural application of rare earth (RE) has been generalized for several decades, and it is involved in crops, vegetables and stock raising in China. However, all the researches on RE mainly focus on the fields such as plant physiological activity, physiological and biochemical mechanism, sanitation toxicology and environmental security. Plant protection by using RE and the induced resistance of plant against diseases were summarized. The mechanism of rare earth against plant disease is highlighted, which includes following two aspects. First, RE elements can control some phytopathogen directly and reduce its virulence to host plant. Another possibility is that RE elements can affect host plant and induce the plant to produce some resistance to disease.展开更多
基于2×2列联表,采用方差比率法(R_(v))、x^(2)检验、Pearson相关系数检验和Spearman秩相关系数检验等方法,对福建君子峰国家级自然保护区江南油杉(Keteleeria fortunei var. cyclolepis)群落乔木层主要树种进行种间关联性分析,并...基于2×2列联表,采用方差比率法(R_(v))、x^(2)检验、Pearson相关系数检验和Spearman秩相关系数检验等方法,对福建君子峰国家级自然保护区江南油杉(Keteleeria fortunei var. cyclolepis)群落乔木层主要树种进行种间关联性分析,并通过主成分分析(PCA)划分生态种组。结果表明,21种主要树种总体表现为不显著负关联,且江南油杉与其他物种多呈不显著相关。210个种对中,正相关的有110对,负相关的有81对,不相关的有19对,正负比1.36。绝大多数种对间呈不显著相关,显著率仅为0.48%,物种间相互独立。Pearson相关系数和Spearman秩相关系数检验结果具有一致性,负相关种对数大于正相关种对数,绝大多数种对不显著,显著率分别为6.19%和7.14%。与x^(2)检验相比,Pearson相关系数和Spearman秩相关系数检验方式更加灵敏。运用PCA二维排序可将主要树种划分为4个生态种组,同一生态种组内物种的生态习性和资源需求相似,多呈正相关,种对间相互依赖共存;不同生态种组间物种多呈负相关,种对间相互竞争。江南油杉群落乔木层主要树种的种间关联性较为松散,大多数物种为独立分布,幼苗存在更新障碍,且幼树个体竞争压力较大,种群规模呈逐渐缩小的趋势。为促进江南油杉种群正常生长与更新,应对江南油杉幼苗进行重点保护。展开更多
文摘The floristic elements and the geographical distribution are analyzed in thispaper based on statistics of elements of rare and endangered plants in Tibet. The results have beengained as following: (1) According to 'the National Important Wild Conservative Plants List (List1)' and 'the National Important Wild Conservative Plants List (List 1)', there are a total of 54plant species (48 genera and 33 families); (2) The geographical elements are very complicated inTibet with 12 of 15 distribution patterns of genera classified by academician Wu; (3) There areobvious temperate genera with 28 genera accounting for 60. 4% of the total genera; (4) There areabundant endemic species accounting for 18. 52% of total species but poor endemic genera; (5) Thegeographical distribution is uneven and a great of species distribute in the areas between 1 000 mand 3 500 m above sea level; (6) To protect the rare and endangered plants efficiently, sixconservation measures are proposed, and 35 species are suggested for the conservative plants of theautonomous conservation level.
文摘In-situ study on eleven commercially important species viz; Adiantum capillus-veneris L, Bergenia ciliata (Haw) Sternb, Colchicum luteum Baker, Polygonum amplexicaule D.Den, Cuminum cyminum L, Dioscorea deltoidea Wall Kunth,L Morchella esculenta L, Paeonia emodi Wall ex H Kf, Podophyllum hexandrum (Royle) Chatt & Mukh, Valeriana wallichii DC and Viola serpens Wall ex Roxb was conducted in four locations viz; Malam (1 400 to 2 000?m),Bargin (1 700 to 2 300?m),Biakand (1 500 to 2 100?m) and Shinko (2 100 to 2 700?m).The data was recorded from both protected and unprotected sites of each site.Each site had 3 altitudinal sampling point.The density, herbage coverage and fresh biomass were determined in each locations for every species.All the investigated parameters generally showed an increase of 3 to 6 times over unprotected sites in each locations. Morchella esculenta,Dioscorea deltoidea,Colchicum luteum and Podophyllum hexandrum were absent in all unprotected sites while other species had low values in these sites.The investigated parameters of Colchicum luteum,Bergenia ciliata,Paeonioa emodi,Dioscorea deltoidea and Podophyllum hexandrum generally increased with the increasing elevation.Soil analysis,soil and air temperatures were recorded for each site.The air and soil temperature were slightly higher in open areas than in the protected site and showed decrease with increasing elevation.While the soil fertility was relatively high in protected sites as compared to unprotected area.The study shows that protection promotes the growth, distribution and occurrence of medicinal plants.It is possible with the participation of local communities to conserve these resources.
文摘Agricultural application of rare earth (RE) has been generalized for several decades, and it is involved in crops, vegetables and stock raising in China. However, all the researches on RE mainly focus on the fields such as plant physiological activity, physiological and biochemical mechanism, sanitation toxicology and environmental security. Plant protection by using RE and the induced resistance of plant against diseases were summarized. The mechanism of rare earth against plant disease is highlighted, which includes following two aspects. First, RE elements can control some phytopathogen directly and reduce its virulence to host plant. Another possibility is that RE elements can affect host plant and induce the plant to produce some resistance to disease.
文摘基于2×2列联表,采用方差比率法(R_(v))、x^(2)检验、Pearson相关系数检验和Spearman秩相关系数检验等方法,对福建君子峰国家级自然保护区江南油杉(Keteleeria fortunei var. cyclolepis)群落乔木层主要树种进行种间关联性分析,并通过主成分分析(PCA)划分生态种组。结果表明,21种主要树种总体表现为不显著负关联,且江南油杉与其他物种多呈不显著相关。210个种对中,正相关的有110对,负相关的有81对,不相关的有19对,正负比1.36。绝大多数种对间呈不显著相关,显著率仅为0.48%,物种间相互独立。Pearson相关系数和Spearman秩相关系数检验结果具有一致性,负相关种对数大于正相关种对数,绝大多数种对不显著,显著率分别为6.19%和7.14%。与x^(2)检验相比,Pearson相关系数和Spearman秩相关系数检验方式更加灵敏。运用PCA二维排序可将主要树种划分为4个生态种组,同一生态种组内物种的生态习性和资源需求相似,多呈正相关,种对间相互依赖共存;不同生态种组间物种多呈负相关,种对间相互竞争。江南油杉群落乔木层主要树种的种间关联性较为松散,大多数物种为独立分布,幼苗存在更新障碍,且幼树个体竞争压力较大,种群规模呈逐渐缩小的趋势。为促进江南油杉种群正常生长与更新,应对江南油杉幼苗进行重点保护。
