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Search Results: 1 - 10 of 124063 matches for " WANG Gen-Xuan "
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Wang Gen-Xuan,

生态学报 , 1993,
Abstract: The changes in air humidity, CO2 content, light availability, water and nitrogen (N) content in the soil around isolated plants were determined and anahzed in spring wheat, broad bean and apple plant. The coefficient (a) of ecological effect of each factor, which was defined as a rate of biomass increase per day due to the change in an ecological factor, was measured. The law of distribution of synthetical ecological effect in the spactial distance away from the plant studied was obtained as follows.It inhibited strongly to the plant of same ecological niche around the location, The effect was transformed from inhibition into mutual promotion at a relative spatial distance because the inhibition decreased quicker than the promotion.
Chlorella Induces Stomatal Closure via NADPH Oxidase-Dependent ROS Production and Its Effects on Instantaneous Water Use Efficiency in Vicia faba
Yan Li, Shan-Shan Xu, Jing Gao, Sha Pan, Gen-Xuan Wang
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0093290
Abstract: Reactive oxygen species (ROS) have been established to participate in stomatal closure induced by live microbes and microbe-associated molecular patterns (MAMPs). Chlorella as a beneficial microorganism can be expected to trigger stomatal closure via ROS production. Here, we reported that Chlorella induced stomatal closure in a dose-and time-dependent manner in epidermal peels of Vicia faba. Using pharmacological methods in this work, we found that the Chlorella-induced stomatal closure was almost completely abolished by a hydrogen peroxide (H2O2) scavenger, catalase (CAT), significantly suppressed by an NADPH oxidase inhibitor, diphenylene iodonium chloride (DPI), and slightly affected by a peroxidase inhibitor, salicylhydroxamic acid (SHAM), suggesting that ROS production involved in Chlorella-induced stomatal closure is mainly mediated by DPI-sensitive NADPH oxidase. Additionally, Exogenous application of optimal concentrations of Chlorella suspension improved instantaneous water use efficiency (WUEi) in Vicia faba via a reduction in leaf transpiration rate (E) without a parallel reduction in net photosynthetic rate (Pn) assessed by gas-exchange measurements. The chlorophyll fluorescence and content analysis further demonstrated that short-term use of Chlorella did not influence plant photosynthetic reactions center. These results preliminarily reveal that Chlorella can trigger stomatal closure via NADPH oxidase-dependent ROS production in epidermal strips and improve WUEi in leave levels.
Advances research in plant nitrogen,phosphorus and their stoichiometry in terrestrial ecosystems:a review

LIU Chao,WANG Yang,WANG Nan,WANG Gen-Xuan,

植物生态学报 , 2012,
Abstract: Nitrogen (N), phosphorus (P) and their stoichiometry play pivotal roles in plant structure and functions, development and ecological strategies in terrestrial ecosystems due to their coupling with each other and their irreplaceability. Plant N and P can be influenced by biotic and abiotic factors, such as individual traits, climate change and human disturbance, and it is those factors that determine the plant community composition and structure that finally affect the ecosystem processes. According to previous studies, there is an allometric relationship between N and P. Relationships between plant N and P depend on the soil nutrient condition and species plasticity in N and P. Understanding the relationships between plant N and P in major ecological gradients can further our knowledge about vegetation restoration, succession, biodiversity, ecosystem trophic structure and biogeochemical cycles. This information could help predict potential changes in terrestrial ecosystems in response to future climate change. We review recent advances in the influencing factors and mechanism of stoichiometry in order to improve understanding of plant responses to global change.
Progress in molecular and physiological mechanisms of water-saving by compensation for water deficit of crop and how they relate to crop production

ZHOU Lei,GAN Yi,OU Xiao-Bin,WANG Gen-Xuan,

中国生态农业学报 , 2011,
Abstract: The theory and technology of water-saving through crop compensation for water deficit and how they relate to crop production are theoretically important and potentially promising in agriculture application. Molecular and physiological mechanisms, however, still constitute those issues that need further research. The molecular and physiological processes of water-saving of crop by compensation for moderate water deficit was systematically analyzed based on related research advances in recent years. The researches results showed that water deficit and re-watering could change growth of plant nutritional organs such as roots, stems and leaves. Osmo-regulation, transpiration, photosynthesis and other physiological processes were also altered by water deficit and re-watering. Protein activity and molecular metabolism of crops adapted to changes in water availability. A water deficit threshold controlled compensations in crop production. With appropriate degree and duration of water deficit, crop water use efficiency improved and even increased (instead of decreasing) crop yield. If widely adopted in agricultural production, water-saving technologies through compensation for water deficit could be vital for improving economic returns and food safety.

PAN Xiao-Yun,WANG Yong-Fang,WANG Gen-Xuan,CAO Qin-Dong,WANG Jing,

植物生态学报 , 2002,
Abstract: 增加有效分蘖数被认为是提高小麦(Triticum aestivum)产量的重要方法之一,但是小麦种群在生长进程中也会形成大量的无效分蘖,存在“生长冗余”。研究了覆膜栽培对两个春小玫种群中无效分蘖比率和收获指数的影响,并从植物个体大小不整齐性和生活史策略的种群生态学角度探讨其影响机制。与露地对照相比,覆膜栽培能显著提高春小麦产量(+38.5%);产量的提高源于地上部分生物量(+44.7%)的显著增加。但是,覆膜种群的繁殖分配(穗重/地上部分生物量,-5.2%)和收获指数(-4.5%)显著降低;在几个主要生育期里(拔节期、开花期和成熟期)覆膜种群中无效分蘖数及无效分蘖生物量比率均显著大于露地对照。说明覆膜种植加剧了春小麦种群的生长冗余。地膜覆盖与其对照的Gini系数动态有显著差异;其中在拔节期与开花期覆膜处理高于对照;在成熟期覆膜处理低于对照;并且,种群的繁殖分配和收获指数都与种群的平均Gini系数(4个生育期的均值)呈显著的负相关。我们认为覆膜种群中生长冗余的显著增加(繁殖分配的下降及无效分蘖生物量的增加),是由于覆膜处理促进分蘖的过度发生和生长、造成群体密度过高、个体大小不整齐性增加从而使种群内个体间竞争加剧的结果。由此表明,伴随着产量的显著提高,覆膜种植也加剧了春小麦种群的生长冗余。换句话说,覆膜种植并非总是高效的。
Trade-Offs between the Metabolic Rate and Population Density of Plants
Jian-Ming Deng, Tao Li, Gen-Xuan Wang, Jing Liu, Ze-Long Yu, Chang-Ming Zhao, Ming-Fei Ji, Qiang Zhang, Jian-quan Liu
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0001799
Abstract: The energetic equivalence rule, which is based on a combination of metabolic theory and the self-thinning rule, is one of the fundamental laws of nature. However, there is a progressively increasing body of evidence that scaling relationships of metabolic rate vs. body mass and population density vs. body mass are variable and deviate from their respective theoretical values of 3/4 and ?3/4 or ?2/3. These findings questioned the previous hypotheses of energetic equivalence rule in plants. Here we examined the allometric relationships between photosynthetic mass (Mp) or leaf mass (ML) vs. body mass (β); population density vs. body mass (δ); and leaf mass vs. population density, for desert shrubs, trees, and herbaceous plants, respectively. As expected, the allometric relationships for both photosynthetic mass (i.e. metabolic rate) and population density varied with the environmental conditions. However, the ratio between the two exponents was ?1 (i.e. β/δ = ?1) and followed the trade-off principle when local resources were limited. Our results demonstrate for the first time that the energetic equivalence rule of plants is based on trade-offs between the variable metabolic rate and population density rather than their constant allometric exponents.

WEI Xiao-Ping,ZHAO Chang-Ming,WANG Gen-Xuan,CHEN Bao-Ming,CHENG Dong-Liang,

植物生态学报 , 2005,
Abstract: Most desert soil management decisions are based on quantitative measurements of the biomass of thedominant plant species. The biomass of the dominant plant species in a typical oasis-desert ecotone (ODE) ofMinqin was measured in 82 plots ( 10 m × 10 m). The results showed that the distribution and total cover wasapproximately 16.12%. Above- and below-ground biomass of five dominant desert species (Nitraria tanguto-rum, Calligonuum mongolicum, Haloxylon ammodendron, Agriophyllum squarrosum and Halogeton arach-noideu) was measured by excavation. Linear regressions were used to analyze the relationships among all thebiomass components for each plant (fresh and dry weight of above- and below-ground biomass) and the basaldiameter, total height and canopy cover. Best fit models were constructed for each species using 80% of thedata. Our results showed that basal diameter (excluding N. tangutorum) and canopy cover were the best pre-dictors of biomass for all five desert plant species. A validation test using the other 20% of the data not usedfor estimating the regression equations indicated that these equations made accurate predictions of desert plantspecies biomass.
Impacts of different concentrations of main pollutants from the synthetic leather industry on the physiology and ecology of Pinus taiwanensis

CHEN Mao-Quan,WANG Gen-Xuan,LIU Shu-Xin,BAI Yan-Yuan,YING Jun-Hui,CHEN Bing-Hong,WANG Dong-Ming,

植物生态学报 , 2011,
Abstract: Aims Vegetation in developed areas of China has been polluted by dimethylformamide (DMF) and toluene (TOL),solvents used in the synthetic leather industry;however,little research has been done on the impact of these pollutants on the physiology and ecology of trees.Methods In this paper,we studied the pollution effects of DMF and TOL on the physiological and ecological characteristics of Pinus taiwanensis.Important findings DMF began to induce an increase in total soluble sugars and glutathione (GSH) in the...
Weighted swarm intelligence cross-layer resource allocation algorithm with proportional fairness

HOU Hu,LI Gen-xuan,

计算机应用研究 , 2012,
Abstract: 针对多用户OFDM系统,提出两种适用于混合业务的加权比例公平跨层资源分配方案。该方案假设系统用户拥有多个队列,每个队列分别承载不同类型的业务。在MAC层,所提的两种方案都实施加权比例公平调度。该调度先为用户队列中不同分组授予不同的权重,再通过该权重值计算用户权重,并对每个用户的分组进行排序,最后根据系统中各用户待传数据量之比设置用户间速率成比例约束条件。在物理层,这两种方案不仅都将用户间速率成比例约束条件下系统权重容量和的最大化作为优化目标,而且都在该目标下将群智能算法引入其资源分配。但有所不同的是,方案1将人工鱼群算法引入其子载波分配,用新推导的功率分配方式进行功率分配;方案2将云自适应粒子群算法引入其子载波分配,用人口迁移算法进行功率分配。在此基础上,两种方案都依据由加权比例公平调度提供的各用户分组排序结果传送分组。数值仿真与性能分析显示,这两种方案能在满足用户业务流时延需求和保证用户公平性的基础上,有效提高系统总速率。
Application of 3-D Parallel Electrical Technology Detecting the Water-Rich Areas  [PDF]
Xuan Wang, Liquan Guo
Open Journal of Geology (OJG) , 2014, DOI: 10.4236/ojg.2014.410038
Abstract: Coal working face is damaged more and more seriously by water below the coal face floor. Therefore, floor water detection is a must in the process of extraction. This article aims to introducing application and principle of the two-gateways parallel 3-D electrical technology and the arrangement of the observation system. The authors use this method to detect the water under the floor of a mine in north of Anhui. The results show that the two-gateways parallel 3-D electrical technology can accurately locate the water-rich areas, providing the basis for drilling drainage and grouting construction.
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