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《Acta Zoologica Sinica》 1984-04
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Niu Wenyuan (Institute of Geography, Chinese Academy oj Sciences)  
As an important aspect of ecological researches, the spatial distribution of vavious ecosystems have been studied during the last twenty years.One particularly useful application of spatial patterns analysis is to monitor the dynamic of ecosystems succession. On the other hand, it can be considered as a significant method to classify ecosystems existing in certain geographical regions. By this approach, the stability of ecosystems can be evaluated, and the primary productivity of the ecosystems can be also estimated.Considering the distribution of points in a plane,the E-index(Executive Index) has been designed with the application of the nearest neighboring analysis, the gravity theory,and probability theory.In this study,the calculation of the E-index spectrum has been listed. The author has adopted the distance between two nearest neighboring quadrats containing points rather than that between two points as a conventional method to make the E-index.Some spatial adjustments and managements of ecosystems in more accurate and efficient ways can be suggested by the threshold of E-index.Applications and verification of the E-index were elucidated by some examples in this paper.
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【Secondary References】
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1 SHU Qing-tai1 LIAO Sheng-xi2 (1 Faculty of Resource, Southwest Forestry College, Kunming 650224, Yunnan, China; 2Institute of Forest Resource insects , Chinese Academy of Forestry, Kunming 650224, Yunnan, China);Studies on Classifation and Succession of Pinus yunnanensis Natural Forest Landscape Based on Data of Class Ⅱ investigation to forest resources[A];[C];2009
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