The biomass and net primary production of Mongolian scotch pine (Pinus sylvestris L. var mongolica) plantations of west Kerqin sandy land were measured. According to average standard trees, the biomass, netprimary pro...The biomass and net primary production of Mongolian scotch pine (Pinus sylvestris L. var mongolica) plantations of west Kerqin sandy land were measured. According to average standard trees, the biomass, netprimary production and their distributions of trunk, bark, branch, leaf and root of 16-year-old stand were analyzed.The regressive equation for the estimation of each organ biomass was established through djmensional analysis.Preferable equation with higher precision was selected. The study results showed that the total biomass of theforest community was 62.023 t/hm2 and net primary production was 5.045 V(hm2. a). which indicates that thecommunity of plantation possesses high bio-productivity.展开更多
Impacts of afforestation on land use change at Xinglongzhao area were analyzed by using 3S techniques based on remote sense data in 1975,1985,1995,and 2005.The results showed that fixed sand dune area decreased by 39 ...Impacts of afforestation on land use change at Xinglongzhao area were analyzed by using 3S techniques based on remote sense data in 1975,1985,1995,and 2005.The results showed that fixed sand dune area decreased by 39 545.77 hm2(from 45 789.74 hm2 to 6 243.97 hm2)from 1975 to 2005,and the annual change rate of area ratio was-2.9%.Woodland and cropland increased obviously,and woodland alone increased by 30 025.56 hm2,with the annual rate 1 117.52%.Rest types of land use did not change obviously.The land use change was characterized by the shifts from the mobile dune to the semi-fixed dune or the fixed dune,from the semi-fixed dune to the fixed dune,and from the fixed dune to the woodland and cropland.Landscape indices such as Shannon diversity,Shannon evenness,and connectance indices decreased,while the patch density increased.This study indicated that the afforestation resulted in a decrease in the landscape heterogeneity and an increase in the landscape fragmentation.展开更多
文摘The biomass and net primary production of Mongolian scotch pine (Pinus sylvestris L. var mongolica) plantations of west Kerqin sandy land were measured. According to average standard trees, the biomass, netprimary production and their distributions of trunk, bark, branch, leaf and root of 16-year-old stand were analyzed.The regressive equation for the estimation of each organ biomass was established through djmensional analysis.Preferable equation with higher precision was selected. The study results showed that the total biomass of theforest community was 62.023 t/hm2 and net primary production was 5.045 V(hm2. a). which indicates that thecommunity of plantation possesses high bio-productivity.
文摘Impacts of afforestation on land use change at Xinglongzhao area were analyzed by using 3S techniques based on remote sense data in 1975,1985,1995,and 2005.The results showed that fixed sand dune area decreased by 39 545.77 hm2(from 45 789.74 hm2 to 6 243.97 hm2)from 1975 to 2005,and the annual change rate of area ratio was-2.9%.Woodland and cropland increased obviously,and woodland alone increased by 30 025.56 hm2,with the annual rate 1 117.52%.Rest types of land use did not change obviously.The land use change was characterized by the shifts from the mobile dune to the semi-fixed dune or the fixed dune,from the semi-fixed dune to the fixed dune,and from the fixed dune to the woodland and cropland.Landscape indices such as Shannon diversity,Shannon evenness,and connectance indices decreased,while the patch density increased.This study indicated that the afforestation resulted in a decrease in the landscape heterogeneity and an increase in the landscape fragmentation.
