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For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Effect of Species-mixing on the Growth, Structure and Productivity of Cunninghamia lanceolata and Elaeocarpus sylvestris Mixed Forests Haoran ZHOU, Honggang SUN, Peng ZHANG, Yuanyuan HAN, Wenhua LI Bulletin of Botanical Research    2024, 44 (2): 307-320.   DOI: 10.7525/j.issn.1673-5102.2024.02.016 Abstract （44）   HTML （5）    PDF（pc） （1621KB）（53）       Knowledge map    Save To explore the mixing effect of Cunninghamia lanceolata and Elaeocarpus sylvestris， 20-year-old pure and mixed C. lanceolata and E. sylvestris plantations in Fengshushan Forestry Farm in Jingdezhen were selected as test objects， and three slope positions（up slope position， middle slope position and down slope position） were set for each stand type， and the effect of mixed tree species on the plantation growth was analyzed， and the responses of the mixed effects on site condition and on environmental factors was investigated， respectively. The results showed that the volume of the mixed forests ircreased by 5% compared with the expected volume， showing a slightl increase. Compared with pure stands， the diameter distributions of the two species showed opposite trends to the mixed， the peak of diameter distribution of C. lanceolata in mixed stands moved towards higher order， however， the peak of diameter distribution of E. sylvestris in mixed stands moved towards lower order. The allometric analysis of coarse root diameter-stem diameter of pure and mixed plantations showed that C. lanceolata allometry in mixed forests was focused on stem growth， while E. sylvestris allometry in mixed forests was focused on root growth， regardless of forest type and tree species， tree growth would focus on stem growth from slope position to bottom. There was a significant negative correlation between the mixed effect of C. lanceolata and E. sylvestris and the site index， the soil available phosphorus was the main limiting factor for the growth of the mixed forests. The mixed forest of C. lanceolata and E. sylvestris might improve stand growth， and the mixed stands had better adaptability to poor site conditions. Table and Figures | Reference | Related Articles | Metrics Select Effects of Eucalyptus Introduction on Species Composition and Diversity of Understory Plant Functional Groups Yuanyuan TANG, Fuying DENG, Xiaoqing ZHAO, Pei HUANG, Junyi TAO, Shijie ZHOU, Bocheng CHU Bulletin of Botanical Research    2023, 43 (6): 943-952.   DOI: 10.7525/j.issn.1673-5102.2023.06.016 Abstract （63）   HTML （6）    PDF（pc） （806KB）（99）       Knowledge map    Save In order to answer the controversial question of the effects of Eucalyptus introduction on plant diversity， the Eucalyptus forest in Lancang County， a large-scale introduction area of Eucalyptus in Yunnan Province， was taken as the research object， and the secondary evergreen broad-leaved forest and artificial Pinus kesiya forest were used as reference forests， and six groups of comparative plots were set up， and the plants were divided into different functional groups. The species composition characteristics and species diversity index of each functional group under Eucalyptus forest and reference forest were compared and analyzed， and the effects of Eucalyptus introduction on the species composition and diversity of understory plant functional groups were examined. The results showed that： （1）the replacement of the secondary evergreen broad-leaved forest by Eucalyptus plantation would increase the number of species in the warm-sun-medium functional group and decrease the number of species in the warm-shade-wet functional group. The replacement of artificial Simao pine forest by Eucalyptus forest would increase the number of species in warm-shade-wet functional group and reduce the number of species in warm-sun-medium functional group. （2）the species composition and important value of understory plants changed after Eucalyptus forest replaced the two reference forests， Eupatorium adenophorum occupied the absolute dominant position of warm-sun-medium functional group， and Arthraxon hispidus occupied the absolute dominant position of warm-shade-wet functional group. （3）after Eucalyptus forest replaced the two reference forests， the Shannon-Wiener diversity index and Pielou uniformity index of the warm-sun-medium functional group under the forest were significantly decreased（P<0.05）， but there was no significant effect on the species diversity index of the warm-shade-wet functional group（P>0.05）. In conclusion， Eucalyptus introduction changed the species composition of understory plant functional groups， and had different effects on the species diversity of different plant functional groups. Table and Figures | Reference | Related Articles | Metrics Select Competition Pattern of Standing Trees in Secondary Pinus Forest in the Ziwuling Mountains, China Shuzhen ZOU, Caijia YIN, Qian YANG, Long MA, Di KANG Bulletin of Botanical Research    2023, 43 (1): 140-149.   DOI: 10.7525/j.issn.1673-5102.2023.01.015 Abstract （11524）   HTML （39）    PDF（pc） （3338KB）（2076）       Knowledge map    Save In order to reveal the driving mechanism of competition dynamics and pattern formation in the process of arid forest restoration and succession， the competition and spatial distribution pattern of standing trees in arid forest China were studied， and a typical secondary Pinus tabuliformis forests was investigated in the Ziwuling Mountains， China， and four larger sample sites（0.25 hm2 each） in different developmental stages were selected， according to the method using space instead of time， and some details of population， size， inter-tree competitions and spatial pattern of four sample sites were acquired respectively. The results showed that， in the four communities at different stages of succession， population densities of P. tabulaeformis were 1 476， 996， 800 and 648 per ha2 respectively； population densities of Betula platyphylla were 48， 32， 44 and 16 per ha2 respectively； and population densities of Populus davidiana were 64， 28， 24 and 12 per ha2 respectively. Competition index of main tree specials decreased with succession， and showed P. tabulaeformis>B. platyphylla>P. davidiana. Quantity of small individuals（diameter at breast height from 2-15 cm） decreased obviously； but quantity of large individuals（diameter at breast height larger than 30 cm） increased. In all succession stages， the competitive intensity of P. tabulaeformis decreased with the increase of diameter. The horizontal spatial competition pattern of P. tabulaeformis showed a patchiness distribution. P. tabulaeformis clumped at the scales 0-5 m， and negative correlated with other tress specials at the scales 5-15 m. Quantity of small size Pinus individuals decreased obvious in later developmental stage. Inter-tree competition of P. tabulaeformis was stronger than other tree species， and inter-tree competition decreased in the later developmental stage. The conclusions are as follows： the size of trees are negatively correlated with the competition index； the competition index of P. tabulaeformis is higher than other species； the competition at community scales decline as development， and the quantity and range of the patches with an intense competition decline， but do not disappear yet. Competition and spatial relations are observed within the scales of 5-15 m which are larger than the average crown size of Pinus. The conditions suggest that the range of inter-tree influence could expand indirectly beyond their crown range through unknown methods， which should be further investigated. Table and Figures | Reference | Related Articles | Metrics