| It is significant to exploit regenerative resource and bio-energy to alleviate the dependence of economy development on petroleum. However, in the process of bio-energy development, we should avoid the contradictions of competition for food with human and completion of farmland with crops. Therefore, the best choice of bio-energy plant is natural wild species, which can be cultivated in large-scale, and has strong ecological adaptability in harsh environment. According to above role, we mainly study the effect of water and fertilizer on the Jerusalem artichoke's potential energy in Xilin River Basin by some water and fertilizer experiments. Meanwhile, we also had done some investigation on biomass energy ability of some wild species and community level in different habitats combined local area conditions,aiming to provide some theoretical references for biomass plants cultivation and wild energy plant exploitation in Xilin River Basin, Inner Mongolia Autonomous Region. The results had showed as the following points.1. The average calorific value of main structured plant is between 17.12 and 19.09 MJ kg-1in different habitat conditions of Xilin River Basin. The highest of the average calorific value is grasses from rangeland, and the lowest of that is from wetland. So the sandy plant is in the middle level. The total energy order of plant community form high to low is grassland community, wetland community and sand community.2. Grassland enclosure can incrase the energy accumulation of grassland community, and the total energy of community increased at first and reduced as enclosing time prolong.3. The rank order of heat value among different plant life forms is shrubs> perennial grasses> forbs> annual herb. Among the plant organs, the root has minimum heat value. The order of heat value of three plant parts (stems, leaves and reproductive organs) showed variety with different species and habitats.4. The total energy of wetland, grassland plant community in growing season shows a single peak trend. The total energy peak of wetland plant is in July, and the peak of rangeland grasses is in August. Sandy plant's energy presents a growing trend, and the peak is in September. The aboveground biomass of plants from wetlands, sand and rangeland shows a single peak curve in growing season, and the highest value was in August.5. In Xilin River Basin, irrigation can improve the Jerusalem artichoke's plant height, aboveground biomass, below-ground biomass and tuber yield significantly. Irrigation can also increase the number of Jerusalem artichoke's tubers per plant significantly. Under irrigation conditions, the optimal nitrogen application of Jerusalem artichoke is 25-50 kg ha-1; while in no irrigation conditions, the optimal nitrogen application is 70kg ha-1.6. Appropriate harvest time deference can increase tubers production of Jerusalem artichoke significantly in Xilin River Watershed, while it has no significant effect on aboveground biomass.7. Delaying Jerusalem artichoke's harvest time can reduce the ash content of roots, stems, leaves and tubers, and increase the carbon content of each part. It can also enhance the energy accumulation of underground roots and tubers of Jerusalem artichoke, and decrease energy accumulation of above-ground parts (stems, leaves). Under irrigation condition, the accumulation of energy of Jerusalem artichoke gets the highest when the nitrogen application amount is 25-50 kg ha-1.8. There was similar correlation among the heat value and full carbon, nitrogen and other mineral elements of Jerusalem artichoke and wild plants. Calorific value and total carbon content shows positive correlation significantly (p <0.01). Calorific value and total nitrogen shows a significant positive correlation (p <0.05). Calorific value and ash shows a significant negative correlation (p <0.01). There is no obvious regulation between calorific value and mineral elements.
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