Applied Mechanics and Materials Vols. 675-677

Abstract: With the international economic and trade exchanges, biological invasion has become an important factor in the threat of biological diversity and ecological environment. In order to prevent and control exotic species invasion, using of GIS-based geospatial technology to the potential distribution of invasive species risk assessment can provide the basis for ecological management of invasive alien species better, thus reducing the economic losses due to invasive alien species caused to our country. To this point, the study had done a secondary development based on ArcGIS Engine component. It used niche model to analysis and study potential suitable distribution of alien pests in China, conduct a risk assessment to them. The receiver operating characteristic curve was applied to access the prediction accuracy Analyzed the impact of the distribution of invasive alien species` main environmental variables. It provided a theoretical basis for ecological management of invasive alien species.

Abstract: Southern Xinjiang is a ecological vulnerable area, It mainly reflects in tree aspects: desertification, serious drought, saline-alkali, srong wind and dusty. Jujube tree can resist on drought, wind and dusty, saline-alkali, so we should develop jujube industry vigorously. This thesis description the natural ecological environment of Southern Xinjiang from geography environment, solar-thermal resource, water and land resource, and advantage of the development of jujube industry in Southern Xinjiang ,analyses the existing problems during jujube industry development, puts forward solutions,so this thesis has a big guide meaning to healthy and sustainable development of jujube industry in Southern Xinjiang.

Abstract: Soil microorganism is a very important component part of soil ecosystem, this paper studied composition and diversity of the cultivable fungal communities in farmland soil in Tahe, Dailing, Maoershan three different latitude regions by means of soil dilution plate and soil particle plate and culture on standard media. The results indicated that the tendency of number of cultivable fungal in farmland soil in different regions: Tahe>Dailing>Maoershan. Scopulariopsis, Chaetomium, Neurospor, Cephalosporium, Aureobasidium and Penicillium occured in farmland soil of three samples, and they were common groups. The cultivable fungal diversities in farmland soil of three sampling regions were no significantly difference, and Dailing was the highest in four different diversity indexes.

Abstract: In this study, the ecosystem service function value of Lingang wetland park was calculated,such as hydrological regulation,water conservation and purification, biological habitat, erosion control, carbon sequestration and oxygen release port,with the market value method, carbon tax and forestation cost method, shadow engineering method, replacement cost method ,ecological value method and other methods. The results showed that the total ecosystem service function value of this wetland park is ¥1.03×10⁸•a^-1. The species habitat, carbon sequestration and oxygen release and hydrological adjusting function value is larger, which is 40.3%, 38.3% and 13.0% of the total value, so they are the main core function value of the Park. Therefore, the scientific and rational planning should be carried out in the development of the wetland park, avoiding influencing the ecosystem service function of this park.

Abstract: Recently Shiyang River Basin in China has been the area with greatest population density, highest utilization level of water resources, least per capita water resources, most striking conflict on water use and most serious ecological problems among inland river basins due to the overexploitation and out-of-order utilization of water resources with rapid social and economic development. The Key Control Plan of Shiyang River Basin was published in 2007, which raised the comprehensive control of Shiyang River Basin to the national level. On the basis of comparison analysis on the utilization of water resources and water ecological civilization construction since the key control of Shiyang River Basin, the strategic measures on the sustainable utilization of water resources are proposed.

Abstract: This research induced tetraploid watermelon through tissue culture. The cotyledons of a diploid mini-watermelon (A7) were treated with different concentrations of colchicine on medium for different time. The autotetraploid plants were identified basing on morphology, determination of the number of chloroplasts in stomatal guard cells and flow cytometry analysis. A stable autotetraploid material was observed. The results showed that tetraploid watermelons could be obtained under different treatments, and the highest tetraploid induction rate was up to 25 %. The most effective way was cutting the proximal cotyledons at the 7th day after sowing, then explants were cultivated on MS medium with 0.1 %(w/v) colchicine for 72 h, the adventitious shoot induction rate was 62.5 %, and multiplication coefficient was 3.6.

Abstract: Due to film-mulched cultivation and poor irrigation practices, low oxygen stress could be often caused in root zone in greenhouse, and has negative effects on crops growth. In this study, a barrel experiment was conducted to probe the effects of root zone aeration on tomato (Lycopersicon esculentum Mill) leaves, root systems and biomass accumulation, using calcium peroxide (CaO₂) as oxygen release agent. The results show that i) root zone aeration has little effect on the number of leaves and leave chlorophyll content, while reduces leaf areas of per leave and per plant, ii) root zone aeration could promote the growth and development of roots through increasing the volume, absorption area, specific surface area and total length of tomato roots and iii) root zone aeration raises the biomass of tomato plants, which mainly manifests in the increase of stems and leaves, especially in leaves.

Abstract: [Objective](1) to investigate the factors that influence microspore embryogenesis and plantlet regeneration;(2) to discuss some protocols for the induction culture of microspore-derived embryos and for rooting and transplantation of microspore-derived plantlets. [Proposed Methods] B. campestris ssp. pekinensis ‘Futian 50’ and B. campestris ssp. pekinensis ‘Changkuai’ were used as the experimental materials, then their microspores were cultured in NLN media. [Results] NAA and 2,4-D inhibits the formation of microspore-derived embryos. Low concentrations of cytokinins facilitate embryogenesis, while high concentrations inhibit embryogenesis.The combined effects of auxin and cytokinin are synergistic. However, AC inhibits embryo development. [Conclusion] The better the development of the embryos, the higher is the plantlet regeneration rate. The plant regeneration rate increased significantly on the MS culture medium supplemented with 200 mg·l^-1 AC. MS medium containing 0.1 mg·l^-1 NAA is the optimal medium for rooting of microspore-derived plantlets.

Abstract: Landscape plant is the foundation and guarantee for rural and urban greening, and it has characteristics of regional distribution and landscape territory. Research on investigation and evaluation, selection and cultivation and protective utilization of wildlife plants, original cultivated plants and introduced plant resources according to different area types can provide the basis and technical assistance for regional landscape plants selection.

Abstract: Regeneration of tartary buckwheat seedlings is a new cultural technology concerning One-year-two-harvest of tartary buckwheat. Buckwheat was planted 30-40 days ahead in a frost-free period of 120-130 days in main buckwheat-producing regions so that the soil can be made full use during dormant phase. Then, buckwheat can be harvested twice. Firstly, when the tartary buckwheat seedlings grow up, it could be harvested during bud period to the beginning of florescence as a green vegetable. And then the tartary buckwheat grains were harvested after autumn. The technology allows farmers increase production of buckwheat, extends the processing industry chain of agricultural product and promotes economic growth in rural origin. Through introducing and trial planting tartary buckwheat variaties of Heifeng1, Hunan7-2, Ding 98-1, 2518, Liner, Huating, Zhuanglang, Tongxin, Gewan. et.al were selected for seeding regeneration.