Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-26 Cooperative journals: 《广西植物》
Abstract： Thuidium kanedae is a kind of moss with wide distribution and high landscape value. However, we lack information about cultivation of Thuidium kanedae. To investigate an appropriate scheme of fertilization for the growth and development of Thuidium kanedae, pot culture experiments were conducted with no fertilization (CK) as control, using urea (N fertilizer), calcium superphosphate (P fertilizer) and potassium sulfate (K fertilizer) combination treatment, set three levels (1-3) fertilization schemes. We investigated the growth length, coverage and color ratio of Thuidium kanedae in various treatments, and we confirmed the fertilization scheme conducive to its growth. At the same time, the changes of related physiological indexes of plants in the optimal fertilization scheme were measured to explore the effects of fertilizer on the growth and physiological characteristics of Thuidium kanedae. The results were as follows: (1) The coverage of Thuidium kanedae under N1 and N2P2K2 treatments were the highest and significantly higher than that of CK. The plant length under N1 and N2K2 treatments was the highest and larger than CK. N3P3K3 and N2P2K2 treated plants had the best green degree maintenance. (2) N fertilizer and combined application of NK and NPK had the best promotion effect on the growth of Thuidium kanedae. Overall, the content of chlorophyll, carotenoid and soluble sugar in these treatments was higher than that of CK, while the content of soluble protein was lower than that of CK. (3) The correlation analysis showed that the green proportion was highly significantly and positively correlated with the coverage, the growth length was highly significantly and negatively correlated with the chlorophyll content of the plant. The results of this study illustrated that different treatments of fertilizer have different effects on the growth and color of Thuidium kanedae. N fertilizer should be the main fertilizer for Thuidium kanedae, and P and K combined application should be supplemented. N2P2K2 (N, P, K fertilization rates were 26, 14, 28 kg・hm-2・ a-1) treatment had the best effect on the growth status and green degree of Thuidium kanedae.
Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-13 Cooperative journals: 《广西植物》
Abstract： Ormosia hosiei is a rare and endangered plant that is narrowly distributed in South China, with important economic and humanistic values. In order to find out its survival status and the reasons that restrict its development, we investigated the natural populations of O. hosiei in four regions of Guizhou and Sichuan provinces, according to the distributive characteristics of different populations, we set up two 20 m ×20 m for each population by using the method of plot investigation and conducted a community survey in each plot. The structural characteristics of O. hosiei populations were analyzed by establishing static life tables and drawing populations survival curves. Four survival functions, number dynamic index, and time series analysis were used to describe survival status. The results were as follows：（1）The age-class structure of O. hosiei populations were in the shape of“J”at Hezhu Village and Ganerpan Village, in the shape of “Dumbbell”at Chenjiawan Village and Rongchun Village, the populations has strong natural renewal ability, but middle-aged individuals are easily missing;（2）The populations belonged to the increasing type, the survival curves of 4 populations are close to Deevey- Ⅱ type, the disappearance rate and mortality rate of O. hosiei populations showed a "Multimodal" pattern in Hezhu Village, Chenjiawan Village and Rongchun Village, indicating that the populations are susceptible to external disturbances in the early and middle period（; 3）All O. hosiei populations in different regions appeared to decrease in the early stage and keep dynamically stable in the medium-late stage, and the formation reasons were related to the topographic characteristics of mountainous areas and the seed dispersal characteristics of O. hosiei;（4）RDA analysis showed that altitude and slope were the dominant factors affecting the populations structure of young individuals, and interference intensity was the main factor affecting the number structure of older individuals. As a result, the structural characteristics of O. hosiei populations in different regions are restricted by the topographic characteristics, the reproductive characteristics and the environmental pressure. By controlling the density of young individuals and managing the growth space of middle-aged individuals, we can increase the survival rate of the seedlings and promote the healthy growth of middle-aged individuals, to maintain the stability of the natural populations of O. hosiei.
Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-13 Cooperative journals: 《广西植物》
Abstract： The purpose of this study is to explore the survival strategy of Phoebe bournei seedlings in natural communities under extremely low light environment. 2-year-old seedlings of P. bournei were used as experimental materials to study the effects of different treatments were measured by simulating different light environments (100%, 35% and 10% light transmittance) on leaf morphology, anatomical structure and photosynthetic physiological characteristics of P. bournei seedlings, and to explore the internal relationship between seedling morphology, physiological plasticity and light adaptation. The results were as follows: (1) The leaf length, leaf width, leaf area and specific leaf area (SLA) of seedlings increased with the decrease of light intensity; The leaf thickness, palisade tissue thickness, Thickness ratio of palisade tissue to sponge tissue of 10% light transmittance were the minimum. (2) The net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), light utilization efficiency (LUE), photochemical quenching coefficient (qp), non photochemical quenching coefficient (NPQ), effective photosynthetic quantum yield (Fv'/Fm') and potential photochemical efficiency (Fv/Fo) of 35% light transmittance were significantly higher than those of 100% and 10% light transmittance. (3) Chlorophyll a, Chlorophyll b, Carotenoids, total chlorophyll and Fv/Fm all increased with the decrease of light intensity, but chlorophyll a/b decreased with the decrease of light intensity. (4) The plasticity index of seedling structure and physiology showed that photosynthetic pigment content characteristics>morphological characteristics>photosynthetic characteristics>anatomical structure characteristics>chlorophyll fluorescence parameter characteristics, among which, the plasticity index of leaf area, SLA, Pn, Gs, LUE and photosynthetic pigment content ranged from 0.455 to 0.755. To sum up, P. bournei seedlings are not suitable to grow under full light, and perform well under about 35% light transmittance; under extremely low light with 10% light transmittance, P. bournei leaves can improve light energy capture by increasing leaf area, SLA, Pn and photosynthetic pigment content; the seedlings of P. bournei mainly adapt to the low light environment by adjusting the plasticity of photosynthetic pigment content and morphology, coordinating with the changes of anatomical structure, photosynthetic physiology and chlorophyll fluorescence parameter plasticity. This study can provide theoretical basis, management and selection of light environment of P. bournei for the future cultivation.
Subjects: Biology >> Botany >> Applied botany submitted time 2023-06-05 Cooperative journals: 《广西植物》
Abstract： In recent years, many studies have shown that extreme climate events occur more frequently. The extreme climate led to frequent drought and inundation events, which affected the growth of both exotic and native plants. In order to discuss the strategies of exotic and native plants in adapting to temporal heterogeneity in water conditions by investigating their responses to the sequence of drought and inundation events, four native and four exotic perennial herbaceous species in western Montana, USA were used as study objects. All plants were treated with moderate water (CK), initial inundation before drought (I-D) and initial drought before inundation (D-I) conditions, and variations in a series of morphological and biomass traits were measured. The results were as follows: (1) Compared with CK, both D-I and I-D treatments significantly reduced the total biomass of exotic species (P < 0.05). (2) D-I treatment significantly reduced the total biomass at the early stage, and late belowground biomass and root: shoot ratio of native species, but significantly improved their later relative growth (P < 0.05). (3) D-I treatment significantly reduced the scaling exponent of the allometric relationship between belowground and aboveground biomass for all plants, with a higher allometric exponent for exotic species than native species (P < 0.05). In conclusion, the sequence of extreme events (inundation and drought) could alter the allocation of biomass between exotic and native plants. Early drought was more likely to reduce the accumulation of plant biomass than late drought, but it could promote the growth of native species in late period. The total biomass of native species was not reduced under environmental stress, indicating that native species had a strong ability to maintain phenotypic stability. Distribution patterns of aboveground and belowground biomass relationships were different between native and exotic species under D-I treatment.
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