Subjects: Biology >> Botany >> Applied botany submitted time 2023-12-24 Cooperative journals: 《广西植物》
Abstract： The purpose of this study is to investigate the species diversity of Malmidea in China and further identify its species composition and distribution. Three new records of Malmidea are reported from China, M. indica (D. D. Awasthi & M. R. Agarwal) Hafellner & T. Sprib, M. reunionis Kalb and M. hechicerae Kalb. The specimens were collected from Yunnan Province. Detailed descriptions and illustrations were provided for each species. A key to all known Chinese Malmidea species was also provided. This study enrich the diversity of Malmidea in China, and has some significance for the conservation and study of lichen diversity of China.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-07-20 Cooperative journals: 《广西植物》
Abstract： The mutually beneficial symbiosis system formed between arbuscular mycorrhizal fungi (AMF) and host plants is one of the representative types of symbiosis systems widely distributed in various ecosystems. In addition to promoting the growth and development of host plant, AMF can also have various effects on the reproduction process of host plants. Studying the changes of reproduction strategies of host plants infected by AMF has important theoretical significance for in-depth understanding of changes in plant reproduction fitness. In this article, we review the related researches on the effects of AMF on the reproduction of host plant, including the effects of AMF infection on reproductive allocation, floral characteristics, insect-pollination and anthesis of host plants. Although current studies have found that AMF can promote the increase of host plant reproduction input, increase the size and number of flowers, increase the number of pollen and nectar secretion, affect the behavior of flower visitors, and cause early flowering and prolonged flowering, the specific mechanism of AMF affecting reproduction of flowering plant is still unclear, and there is currently no unified conclusion due to differences between host plants. However, due to the ubiquity of AMF symbiosis with plant, its important role in the process of plant reproduction cannot be ignored. In the future, more researches should be conducted to investigate the influence mechanism of AMF on the reproductive traits of host plants, the resource allocation of male and female functions in the process of plant sexual reproduction, asexual reproduction and offspring fitness in addition to conducting more in-depth studies in the above-mentioned aspects.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-06-02 Cooperative journals: 《广西植物》
Abstract： In order to reveal the effects of different vegetation restoration modes on soil microbial communities in karst areas, this study took pure Dalbergia odorifera plantation (PDOP), pure Acrocarpus fraxinifolius plantation (PAFP) and their mixed plantation (MADP) as research subjects. The soil microbial biomass and microbial community structure of different plantations were analyzed by chloroform fumigation extraction method and phospholipids fatty acid (PLFA) method. The results were as follows: The soil microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) contents of PDOP were significantly higher than those of PAFP and MADP, and that of PAFP was significantly higher than that of the MADP. The contents of soil fungi, arbuscular mycorrhizal fungi (AMF) and total PLFA were not significantly different among the three plantations, but the contents of soil bacteria, actinomycetes, AMF and total PLFA in PDOP were higher than those in PAFP and MADP, and those in the PAFP were higher than those in MADP. The PLFA contents of bacteria, gram-positive bacteria, gram-negative bacteria and actinomycetes in PDOP were significantly higher than those in MADP. The ratio of fungi to bacteria in MADP was significantly higher than that in PDOP, but there were no significant differences between MADP and PAFP. Redundancy analysis showed that soil cation exchange capacity, pH, and C∶N were the most important factors affecting the functional group composition of soil microbial community. From the perspective of soil microbial biomass and microbial community structure of the three plantations, MADP in karst area did not show the advantage of mixed forest in acid soil region to improve soil microbial community structure. However, the ratio of fungi to bacteria in the mixed plantation is the highest, which is more conducive to improving the stability of soil ecosystem.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-29 Cooperative journals: 《广西植物》
Abstract： The impact of Eucalyptus plantations on the ecological environment has been a hot topic of controversy worldwide. The ecological and environmental effects of a mixture of Eucalyptus and precious native tree species have attracted much attention. In order to explore the effects of management measures in mixed plantations on soil nutrients and understory plant functional groups, we assessed the understory plant communities and environmental factors using pure Eucalyptus plantations (PE), mixed Eucalyptus and Castanopsis hystrix plantations (MEC), and pure C. hystrix plantations (PCH). We found significant differences in the physicochemical properties of soil in the different stands. The soil pH, available nitrogen (AN) content, and available phosphorus (AP) content were significantly higher in MEC than in PE and PCH. However, we noted no significant advantages in terms of the soil moisture content (SMC), soil organic carbon (SOC) content, total nitrogen (TN) content, C:N ratio, and C:P ratio in MEC, with a trend of PE < MEC < PCH. On the other hand, the soil bulk density (SBD) and total phosphorus (TP) content showed a trend of PE > MEC > PCH. MEC significantly increased the species richness of the understory woody functional group (WFG), while PCH significantly increased the species richness of the ferns functional group (FeFG). The importance value of WFG and the Gramineae functional group (GFG) was significantly higher in MCH than in PCH, while the importance value of FeFG was significantly higher in PCH than in MCH. Principal coordinate analysis revealed no significant difference in the composition of understory plant functional groups between MEC and PE but revealed a significant difference between MEC and PCH. Moreover, redundancy analysis revealed that AN and AP were the main factors influencing the dominance of WFG. SMC, TN content, and SOC content were the main factors influencing the dominance of FeFG, while SBD was the main factor influencing the dominance of GFG. Thus, the mixture of Eucalyptus and C. hystrix could improve the availability of soil nutrients and the diversity of understory plant communities to some extent in subtropical China.
Subjects: Biology >> Bioengineering submitted time 2018-03-14
Abstract： Infrared physiotherapy is a new method with the application of infrared light to human body parts, whose effect has been widely reported in the treatment of various diseases. Nowadays,the effectiveness of the infrared physiotherapy wasgenerally assessed by the experience of the medical staffqualitatively. As the parameters of blood flow is the key of physiotherapy evaluation, using a noninvasive, safe, and real time monitoring way onblood flow during therapy will benefit guiding the physiotherapy arrangement to enhance the therapy effect.This paper proposes a method based on bioimpedance technology for infrared physiotherapy evaluation in human arm.Firstly, we choose the BIOPAC physiological information recorder as the core of measure system, withdouble-probe method to measure ECG signal, and four-probe way to synchronously measure the bioimpedance change of human armbefore, during and after the infrared irradiation. Then removing baseline drift and extracting feature points by using wavelet transform, applying simple Bayesian model to ensure the stability of the feature points.The experimental results show that (1)The arm bioimpedance signal characteristic frequency matches the heart rate with an average difference 0.09%-1.60%. (2)After the infrared irradiation, the ratio between secondary and the main wave peaks of arm bioimpedance rises 3.91%-13.05%, namely, bioimpedance can represent the change in arm blood flow, and sensitive enough to make an evaluation of infrared physiotherapy.
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Awaiting Review
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