2015/12/16 11:39:43 DENG XianLan1， WU Yang1， LAI MiYuan2，XU Bin2， LONG WanWan1 14true 2015/12/16 11:39:43 CHEN Ting1， MA JiangMing1，2*， LIANG ShiChu1，2 13true 2015/12/16 11:39:43 CHENG ShengHui1， YANY YuMing1， ZHAO YiHe2*， LI HaoMin1 12true 2015/12/16 11:39:43 ZHANG WeiWei1，2， LIU Nan1， WANG Jun1， REN Hai1， ZHANG LiMin1，2， JIAN ShuGuang1* 11true 2015/12/16 11:39:43 PAN Wen1， LI YuanYue2*， CHEN Pan3， ZHOU HanTao3， LIN Peng3 10true 2015/12/16 11:39:43 HU XingHua1，2， CHEN XiaoYong1 9true 2015/12/16 11:39:43 GU DaXing1，2， HUANG YuQing2， CHEN ShuangLin1* 8true Pinus and Quercus forests in Baxianshan Nature Reserve and to clarify their relationships, three types of natural secondary forests, Pinus tabuliformis forest, Quercus mongolica forest and mixed Pinus tabuliformis and Quercus variabilis forest were selected in Baxianshan Nature Reserve. The structure and renewal potential of constructive species were investigated, the diversities of different levels in communities were calculated and the M.Godron index was determined. The principal component analysis was used to develop an evaluation model. The results were as follows:(1)The DBH class structure of Pinus tabuliformis population distributed normally in the mature stage but with little seedlings. Few seedlings of P. tabuliformis were observed. The numerous seedlings and young individuals of Quercus variabilis, Q. mongolica and broad-leaved weed trees presented greater regeneration potential.(2)The diversity in arbor layer of mixed Pinus tabuliformis-Quercus variabilis forest was higher than other communities, while that in shrub layer was the lowest. The diversity in herb layer of Pinus tabuliformis forest was lowest. The overall species richness in the mixed Pinus tabuliformis-Quercus variabilis forest is the lowest with the highest evenness.(3)The M. Godron stability indicated that Q. mongolica forest was close to the stable point, while Pinus tabuliformis forest was far away.(4)The PCA biplot showed that M.Godron stability was positively correlated with population regeneration potential and Alatalo evenness index. The comprehensive characteristics of communities was ordered as mixed P. tabuliformis-Quercus variabilis forest, Q. mongolica forest and Pinus tabuliformis forest. It is concluded that the population regeneration potential of constructive species and species evenness take great influence on community stability, and the seedlings and young individuals of Quercus should be protected during the forest management.]]> 2021/8/31 16:11:24 1, YANG Jingyi², GAO Yunchang³, LONG Hong^1*, YU Weiwei¹]]> MA Chuang¹, YANG Jingyi², GAO Yunchang³, LONG Hong^1*, YU Weiwei¹ 7true Clematis patens is a wild plant resource with excellent ornamental and medicinal values. In order to make clear the flowering process and pollination rules of C. patens, and to explore effects of introduction environment on flowering process of C. patens, the flowering phenology and pollination characteristics of C. patens on individual and population levels were observed and studied for two consecutive years(2017—2018)by the method of location observation. The results were as follows:(1)The flowering period of the population of C. patens was from mid-May to mid-June. The initial flowering period and the final flowering period were shorter, while the flowering period was longer, about 20 d; the flowering period of a single plant was 5-7 d, and the flowering period of the population was more than 30 d. The flowering proportion showed a trend of increasing first and then decreasing. The cumulative flowering ratio reached 100% one week after flowering. The two-year flowering synchronization index(S_i)was 0.76 and 0.74, respectively, indicating that the difference in flowering characteristics of C. patens in the two years was little.(2)There were 6 species, 13 families and 18 species of flower-visiting insects for C. patens. They have certain differences in the flower-visiting frequency, the flower-visiting behavior, and the retention time on a single flower. There were mainly eight kinds of pollinating insects, which belong to three orders and four families. Apis cerana, Eristalis arbustorum and Betasyrphus serarius had high flower-visiting frequency and long stays on single flowers. It could be preliminarily determined that they played an important role in the pollen transmission of C. patens. The observation of the flowering characteristics of C. patens and the flower-visiting insects as well as the study of the behaviors of the stealing insects, provide the reference for the introduction, cultivation and off-the-spot conservation of C. patens.]]> 2021/8/31 16:11:24 1, ZHANG Yongsheng², SHANG Yühan³, LI Haiwei¹, JI Liqiong¹, HAN Jinxiu¹, WANG Fei^1*]]> WEN Xin¹, ZHANG Yongsheng², SHANG Yühan³, LI Haiwei¹, JI Liqiong¹, HAN Jinxiu¹, WANG Fei^1* 6true Delphinium trichophorum(Ranunculaceae), a typical alpine plant of Qinghai-Tibet Plateau was investigated. Observation of pollinator movements, artificial flower-removal experiment, and hand-supplemental pollination were also used to investigate the effects of resource competition and mating environment on allocation of reproductive resource in the inflorescence. The results were as follows:(1)From bottom to upper positions of inflorescence, stamen number, stamen fresh mass/pistil fresh mass, pollen number and pollen/ovule ratio all increased significantly, while pistil fresh mass and ovule number declined gradually, which showed upper flowers performed male-biased function. Seed set ratio of upper flowers were significantly lower than those of bottom and intermediate flowers. The number and mass of mature seed per fruit decreased significantly with the increase of flower position, indicating greater female reproductive success of bottom flowers.(2)The flower-removal experiment improved single seed mass of the remaining fruits, but did not increase the number of mature seeds per fruit. There were no differences of seed set ratio among positions after hand-supplemental pollination of upper flowers, which suggested that the position-dependent pattern of seed reproduction within inflorescences was attributed to pollen limitation rather than resource competition.(3)The protandry of D. trichophorum and the directional visiting behaviors(from bottom to upper)of pollinator Bombus sushikini led to variations of mating environment within inflorescences. All the above results indicate that intra-inflorescence variation in floral sex allocation and reproductive success of D. trichophorum are results of adaptation to mating environment, and this strategy is of great importance to optimize the male and female fitness for the species.]]> 2021/8/31 16:11:24 1, AN Yumeng¹, SHI Changli¹, MI Zhaorong², ZHANG Chan^1*]]> ZHANG Xin¹, AN Yumeng¹, SHI Changli¹, MI Zhaorong², ZHANG Chan^1* 5true Litsea pungens and L. elongata )in large sample plot of 15 hm² in Mulinzi National Nature Reserve of Hubei Province were taken as the study object. The spatial distribution pattern, intraspecies and interspecific spatial correlations of the two species were analyzed by pairwise correlation function and different zero models(complete spatial randomness, heterogeneous Poisson and antecedent condition), and the construction mechanism of the community was discussed from the point of view of the spatial distribution pattern of the same congeneric species. The results were as follows:(1)In the study of population spatial distribution pattern, the spatial distribution pattern of the two species was generally aggregation distribution. The aggregation scales on the basis of the CSR zero model, the L. pungens and the different diameter stages(sapling, small tree, medium tree, adult tree)were 0-114 m, 0-103 m, 0-56 m, 0-34 m, and 0-16 m, respectively, and the aggregation scales of the L. elongata and the different diameter stages were 0-150 m, 0-150 m and 0-59 m, 0-56 m and 0-14 m; On the basis of the HP-zero model, the spatial distribution pattern of the whole L. pungens was 0-23 m, where in all of the sapling, small and medium trees were 0-22 m, and the aggregation distribution of adult trees was only on the scale of 0-3 m. The aggregation scale of the whole spatial distribution pattern of L. elongata was 0-36 m and 140-150 m, and the aggregation scale of each diameter grade was 0-35 m, 0-35 m, 0-12 m and 0-6 m.(2)In the study of intraspecific correlation, the intraspecies correlation of different diameter individuals showed positive correlation on a small scale, and became weakly unrelated or negative with the increase of scale.(3)In the study of interspecific correlation, the spatial relationship between the two species was about the same. On the whole, the two species showed positive correlation with another species within 30 m scale and negative correlation within 40-68 m scale, and there was no correlation between different diameter grades, and there was positive or negative correlation between the two species. It is considered that the spatial distribution pattern of the population is basically aggregation distribution, which is mainly affected by habitat heterogeneity and diffusion. The spatial distribution patterns of L. pungens and L. elongata in large sample plot are similar, and different habitat preferences may be the cause of the coexistence of the two species.]]> 2021/8/31 16:11:24 1, YAO Lan^1*, AI Xunru¹, ZHU Jiang¹, ZHU Qiang¹, WANG Jin¹, WU Manling¹, LIU Songbo²]]> HUANG Xiao¹, YAO Lan^1*, AI Xunru¹, ZHU Jiang¹, ZHU Qiang¹, WANG Jin¹, WU Manling¹, LIU Songbo² 4true Lamiophlomis rotata, random quadrat investigation and sample collection were conducted under three grassland types and three altitude gradients in Maqu, and the growth and reproduction traits were measured. The results were as follows:(1)The traits of aboveground parts were alpine swamp meadow > alpine hillside meadow > alpine shrub meadow, and the traits of the underground parts were alpine swamp meadow > alpine shrub meadow > alpine hillside meadow;(2)The traits were decreased with the increase of altitude;(3)In different grassland types and altitudes, there was a significant positive correlation between the sexual reproduction structure and plant size, but there was no correlation between the asexual reproduction and plant size;(4)In different grassland types and altitudes, there was no correlation between the two reproduction modes. All the above results indicate that the resource allocation method is affected by grassland types, which is the result of long-term adaptation to the environment; The occurrence of sexual reproduction requires a certain amount of vegetative growth accumulation, while the asexual reproduction may be the inherent characteristics of plants, independent of plant size; The asexual propagation of rhizome bud may occur after the destruction of the aboveground rather than the active behavior. Whether the uncorrelation between the two propagation modes would be affected by other factors needs further study.]]> 2021/8/31 16:11:24 *, CUI Zhijia, ZHANG Jianxu, ZHANG Wenguang]]> XIE Tianpeng^*, CUI Zhijia, ZHANG Jianxu, ZHANG Wenguang 3true Lycopersicon esculentum planted in situ was adjacent to the same species of L. esculentum, Sphagneticola trilobata and S. calendulacea, and 15%, 25%, 50% and 75% Hoagland solution were simulated different nutrient availabilities in greenhouse control experiments, in order to investigate the allelopathic effects of the invasive plant S. trilobata and its native congener S. calendulacea on leaf chlorophyll fluorescence parameters and biomass of the native plant Lycopersicon esculentum under different nutrient availabilities. The results were as follows:(1)The chlorophyll fluorescence parameters and biomass of L. esculentum at 75% Hoagland solution were significantly higher than those of the other three nutrient availabilities.(2)As the nutrient availabilities decreased, PS Ⅱ maximum photochemical efficiency(F_v/F_m), effective PS Ⅱ quantum yield [Y(Ⅱ)], photochemical quenching coefficient(q_p)of L. esculentum leaves and the total biomass of L. esculentum plants were remarkably reduced, while non-photochemical quenching coefficient(NPQ)and the biomass allocation to roots were increased.(3)Under 25% Hoagland solution, F_v/F_m, Y(Ⅱ), q_p and total biomass of L. esculentum planted with Sphagneticola trilobata were remarkably lower than those of Lycopersicon esculentum planted with Sphagneticola calendulacea, NPQ and the biomass allocation to roots were remarkably higher than those of Lycopersicon esculentum planted with Sphagneticola calendulacea. The above results demonstrate that S. trilobata and S. calendulacea may inhibit the growth of Lycopersicon esculentum through the secretion of allelochemicals in roots, and the allelopathic effects of Sphagneticola trilobata is stronger than S. calendulacea. Therefore, increasing nutrient availabilities in cultivation substrate can dramatically reduce the allelopathic effects of S. trilobata and S. calendulacea on Lycopersicon esculentum.]]> 2021/8/31 16:11:24 1, PU Lei¹, LI Junya², ZHAO Ping³, LEI Ningfei^1*]]> GU Rui¹, PU Lei¹, LI Junya², ZHAO Ping³, LEI Ningfei^1* 2true 2021/8/31 16:11:24 *]]> SHEN Yao, WANG Hanxuan, HOU Haixian, WU Zhiming, ZHOU Hougao^* 1true