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Energy is the important resources of modern human existence and development depends, has an important role in promoting social and economic development, with the world's rapid economic development and population growth, the energy problem has become one of the main factors restricting the sustainable development of human society. Large-scale exploitation of fossil energy consumption, resulting in a significant reduction in resources, causing severe environmental pollution, therefore, the development of renewable energy is necessary and urgent task. Forest biomass energy sources with renewable biomass, small environmental pollution, has received the attention of more and more countries in the development and utilization of biomass energy in China is still in its infancy. Characteristics in the development of short rotation poplar (Populus L.) and willow (Salix L.) for its adaptability, fast growth initiation ability, easy to update yield biomass forest has great potential. The the foreign breeding of poplar and willow short rotation energy forest seed, planting density and rotation period, high-yield cultivation techniques, pest control has done a lot of research work, while domestic willow short rotation energy forests suitable for planting density and rotation The ROTATION research still in its infancy and has yet to see the relevant reports. This study is the first time in the country the initial screening of five poplar clones and four willow clones as test material to carry out energy-planting density and rotation period test system in Jiaozuo, Henan, and to analyze the combustion characteristics of the willow tree intended for energy forest clonal selection and high-quality, high-yielding cultivation provides some theoretical and technical basis. The study made the following findings: (1) the ability to carry out observations sprouted willow energy forest clones: 1 year planting sprouting a very small number (usually only 1 to 3), stubble after Promotion first 2 years, the increase in the number of sprouting, and significantly higher biomass. (2) a comparative study of three kinds of planting density (10000,15000,30000 plants / hm2) and rotation period (1 year, 2 years), biomass of four willow energy forest clones found: shrub willow Salix integra and three arbor willow clones Su 795, SU 799, SU 172 are suitable for 2-year rotation period, the planting density of 15,000 / hm2, and its average annual biomass per unit area for 11.27t / (hm2 · a), 8.43 t / (hm2 · a), 6.10t / (hm2 · a), 6.17t / (hm2 · a). (3) of the five poplar Energy forest planting density of 10,000 / hm2, rotation periods were 1 year and 2 Nianxia biomass comparative study found that 50 Yeung 110,313,239,2001 The average annual biomass per unit area in the rotation period of 1 year to 13.72t / (hm2 · a), 15.27t / (hm2 · a), 13.93t / (hm2 · a), 14.73t / (hm2 · a) 12.96t / (hm2 · a), the differences between the clones are not significant; 16.15t / (hm2 · a) in the rotation period of 2 years, 13.92t / (hm2 · a), 13.52t / (hm2 · a) , 13.06t / (hm2 · a), 12.95t / (hm2 · a), and the differences between the clones are not significant; 50 Yang average annual biomass per unit area in the rotation period two years than the rotation period of 1 year increase, while the other clones of the average annual per unit area biomass to reduce, but not much, In addition, the rotation period of 1 year, 2 rotation biological significantly less than 1, and wheel little difference between the biomass of cutting a period of 1 year and 2 years, and it can be initially determined the rotation period of two years is more appropriate than one year. (4) poplar and willow asexual Department of 1 year born and two years students plant's ash content and dry quality calorific value determination analysis found: Willow asexual Department two years students plant's ash content lower than 1 year old, while the calorific values ??higher than 1 year old ; willow clones 1 year born and 2 years of raw plant's ash content, respectively, to 3.30% to 6.43% and 2.93% to 3.73%, calorific values, respectively, to 18.63 ~ 19.28 MJ / kg and 19.11 ~ 19.44 MJ / kg; poplar clonal Department Health and ash content of 2-year-old plants were 3.93% to 5.10% and 2.31% to 3.38%, calorific values ??were 18.00 ~ 18.46 MJ / kg and 18.83 to 19.15 MJ / kg. (5) on the same Young poplar and willow 1 year old plants different components of the ash content, calorific value determination analysis found: poplar and willow clones different compositional ash content change consistent are phloem gt; whole plant gt; cadres; tree clones calorific values ??between the phloem, the whole plant, cadres little difference; willow different components calorific value size order of cadres gt; whole plant gt; leather. (6) willow energy forest planting density and rotation period of a pilot study initially identified a suitable rotation and planting density, and found this planting mode, poplar clones large biomass willow clones, while willow clones calorific values ??are generally higher than the poplar clones. Willow short rotation energy forest planting density and rotation period test carried out in the first system, and carry out a rotation period of 1 year and 2 years willow combustion characteristics analysis, to fill the corresponding field blank, and trying to establish willow energy forest the efficient cultivation technology system, and provide technical and theoretical guidance for our future willow energy forest development. This study will further carry out the rotation period of three years of trials and the related growth of biomass, ash content and calorific value traits such as determination, combined with the rotation period of 1 year and 2 years of test results, and research in different site conditions to carry out the same test to save willow energy forest in China? ultimately determine the appropriate rotation periods.
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