Abstract: Ten major tourist attractions along the Jialing River in Sichuan Province were selected as the study objects. By using Delphi method, the niches of the tourist attractions were divided into “state” and “potential”, and the weights of the niche evaluation of the tourist attractions were obtained by applying AHP. Consequently, the niche evaluation index system of the tourist attractions was determined. Based on niche theory, the niche breadth and niche overlap values of the 10 major tourist attractions were investigated. The results showed that in Jiuzhaigou, the values of tourism resources, tourism market, tourism services, environmental quality, and comprehensive niche were 0.1470, 0.1855, 0.1480, 0.1477, and 0.1570, being the highest among the ten tourist attractions; while Nuoshui River had the lowest scores, with the minimum niche breadth of 0.0676. The niche overlap value of Jiuzhaigou and the Tangjiahe Reserve was the highest (0.6856); while that of Jiuzhaigou and the Daying Dead Sea was the lowest (0.3514). Further calculation showed that the degree of niche overlap greater than 0.5 reached 48% of the total, which meant that the comprehensive niche overlaps of the main tourist attractions in Jialing River Basin were locally high, but not totally high.

Key words: Rice, Methods of fertilization, N fertilizer, Dry matter production, Leaf area