This paper studied the characteristics of the natural understory vegetation in the artificial masson pine forest replanted after Chinese fir cut for 13 years.The results indicated that there were 100 species of unders...This paper studied the characteristics of the natural understory vegetation in the artificial masson pine forest replanted after Chinese fir cut for 13 years.The results indicated that there were 100 species of understory vegetation,including 74 species of shrub or small arbor,accounting for 74.0% of the total species,belonging to 41 faculties and 63 categories,and 26 herbs belonging to 14 faculties and 23 categories.The tropical and subtropical elements were dominant in the vegetation,while the temperate ones were scare.The species diversity and richness were decreased after masson pine regenerated from Chinese fir.The analysis of important value showed that the main species of shrub or small arbor were Tinomiscium tonkinensis,Mycetia longiflora,Evodia lepta,Paederia scandens,Mussaenda pubuscens,Actinodaphne pilosa and Quercus glauca,and those of herb were Cyrtococcum patens,Blechnum orientale,Dicranopteris dichotoma,Adiantum flabellulatum,Adiantum edgeworthii and Pteris semipinnata.The biomass of the vegetation in different slope positions was decreased in order of upside>downside>middle part.There was a significantly positive correlation between the niche breath and the important value of main woody population.The important values of woody populations were higher than those of the others,and their niche breadths were also larger,which meant that they were more adaptable to the habitat.The niche overlaps of six population counterparts Tinomiscium tonkinensis-Mycetia longiflora,Tinomiscium tonkinensis-Evodia lepta,Mussaenda pubuscens-Maesa japonica,Quercus glauca-Aphananthe aspera,Actinodaphne pilosa-Saraca chinensis and Evodia lepta-Quercus glaucathese were very large,which could offer information for the restoration and reconstruction in selecting natural vegetation.The large niche overlaps of major woody population counterparts suggested their similar utilization of natural resources.展开更多
Carbon accumulation and distribution were studied in three plots of a 13 years old Chinese fir （Cunninghamia lanceolata） forest in Daqingshan,Guangxi. The results showed that the average carbon concentration in all ...Carbon accumulation and distribution were studied in three plots of a 13 years old Chinese fir （Cunninghamia lanceolata） forest in Daqingshan,Guangxi. The results showed that the average carbon concentration in all organs was in the following order: leaf （510.5）>bark （501.8）>wood （485.1）>root （476.5）>branch（462.1） （g·kg -1 ）. The carbon concentration of soil （to 60 cm depth） ranged from 11.4 to 21.1 （g·kg -1 ）,with an average of 16.6 （g·kg -1 ）. Carbon concentration of surface soil （to 20 cm） was higher than the other layer. The average carbon concentrations （g·kg -1 ） in different layers were in the order as: trees （497）> shrub （437.5） >standing litters （437.5）>herb （407.8）. The carbon storage of the forest ecosystem was in order of soil layer>vegetation >standing litter. Of total average carbon,23.87% was in vegetation component,74.27% in soil （60 cm depth）,and only 1.86% in standing ground litter layer. The tree layer occupied 22.93% of total carbon storage in the ecosystem and 96.07% of carbon storage in the vegetation layer. The carbon storage in different organs was positively related to the biomass of corresponding organs. Trunk accumulated the highest carbon storage,comprising 58.40% of carbon storage in tree layer. Secondly,root made up 20.09% of total tree carbon. The annual net productivity of Chinese fir plantation was 10.10 t·hm -2 a -1 ,stored carbon up to 4.67 t·hm -2 a -1 ,equal to 17.13 t·hm -2 a -1 of CO2. Chinese fir plantation was an important sink of atmospheric CO2. But its capacity of C sequestration decreased gradually in this region.展开更多
文摘This paper studied the characteristics of the natural understory vegetation in the artificial masson pine forest replanted after Chinese fir cut for 13 years.The results indicated that there were 100 species of understory vegetation,including 74 species of shrub or small arbor,accounting for 74.0% of the total species,belonging to 41 faculties and 63 categories,and 26 herbs belonging to 14 faculties and 23 categories.The tropical and subtropical elements were dominant in the vegetation,while the temperate ones were scare.The species diversity and richness were decreased after masson pine regenerated from Chinese fir.The analysis of important value showed that the main species of shrub or small arbor were Tinomiscium tonkinensis,Mycetia longiflora,Evodia lepta,Paederia scandens,Mussaenda pubuscens,Actinodaphne pilosa and Quercus glauca,and those of herb were Cyrtococcum patens,Blechnum orientale,Dicranopteris dichotoma,Adiantum flabellulatum,Adiantum edgeworthii and Pteris semipinnata.The biomass of the vegetation in different slope positions was decreased in order of upside>downside>middle part.There was a significantly positive correlation between the niche breath and the important value of main woody population.The important values of woody populations were higher than those of the others,and their niche breadths were also larger,which meant that they were more adaptable to the habitat.The niche overlaps of six population counterparts Tinomiscium tonkinensis-Mycetia longiflora,Tinomiscium tonkinensis-Evodia lepta,Mussaenda pubuscens-Maesa japonica,Quercus glauca-Aphananthe aspera,Actinodaphne pilosa-Saraca chinensis and Evodia lepta-Quercus glaucathese were very large,which could offer information for the restoration and reconstruction in selecting natural vegetation.The large niche overlaps of major woody population counterparts suggested their similar utilization of natural resources.
文摘Carbon accumulation and distribution were studied in three plots of a 13 years old Chinese fir （Cunninghamia lanceolata） forest in Daqingshan,Guangxi. The results showed that the average carbon concentration in all organs was in the following order: leaf （510.5）>bark （501.8）>wood （485.1）>root （476.5）>branch（462.1） （g·kg -1 ）. The carbon concentration of soil （to 60 cm depth） ranged from 11.4 to 21.1 （g·kg -1 ）,with an average of 16.6 （g·kg -1 ）. Carbon concentration of surface soil （to 20 cm） was higher than the other layer. The average carbon concentrations （g·kg -1 ） in different layers were in the order as: trees （497）> shrub （437.5） >standing litters （437.5）>herb （407.8）. The carbon storage of the forest ecosystem was in order of soil layer>vegetation >standing litter. Of total average carbon,23.87% was in vegetation component,74.27% in soil （60 cm depth）,and only 1.86% in standing ground litter layer. The tree layer occupied 22.93% of total carbon storage in the ecosystem and 96.07% of carbon storage in the vegetation layer. The carbon storage in different organs was positively related to the biomass of corresponding organs. Trunk accumulated the highest carbon storage,comprising 58.40% of carbon storage in tree layer. Secondly,root made up 20.09% of total tree carbon. The annual net productivity of Chinese fir plantation was 10.10 t·hm -2 a -1 ,stored carbon up to 4.67 t·hm -2 a -1 ,equal to 17.13 t·hm -2 a -1 of CO2. Chinese fir plantation was an important sink of atmospheric CO2. But its capacity of C sequestration decreased gradually in this region.
