Abstract: Sinowilsonia henryi var. glabrescens is a variety of S. henryi, a Chinese endemic and monotypic species, and one of the national secondclass protective plants in China, only distributing in the Lishan Mountain Nature Reserve in Shanxi. To better understand the quantitative dynamics of S. henryi var. glabrescens population and to facilitate its sustainable and steady development, the methods of plot survey and quadrat investigation were adopted to study the population structure of S. henryi var. glabrescens in the Reserve. The static life table of the population was compiled, and its age structure, survival curve, mortality curve, disappearance rate curve, survival function curve, cumulative morality function curve, hazard rate function curve, and death density function curve were drawn. In this population, young and infant plants were in larger quantity, while aged ones were fewer, indicating that this population was overall a growing population. Its morality was higher at early stage than at late stage, and peaked between the Ⅱ and Ⅳ age stages. The survival curve was more of Deevey-Ⅱ type, and the survival function curve decreased monotonically while the cumulative morality function curve was in monotonic increase, the decreasing or increasing range being higher at early stage that at late stage. The death density function curve was relatively stable, with a higher rate during the Ⅲ age class. The hazard rate function curve was increasing with the growth of age class.

Key words: Plant volatiles, Insect behavior, Lure, Repellent