Studies on Surveying Yield of Trollius chinensis and Relationship between Yield and Environmental Factors

Trollius chinensis is an important non-wood wild medicinal plant resource.Surveying on yield and relationship with environmental factors are significant to its rational utilization and protection.Taking Taoshan Forest Farm as research target,resource map and distribution of T.chinensis within the farm were obtained by GPS and GIS.Yield per unit area and total yield were surveyed by two-stage sampling stratified by first class unit.Light and soil factors which affect the yield were determined.The results showed that the area and average yield of per unit area were different among the populations growing in different habitats,from which the area of marsh meadow type was the highest,48.185 hm2,forest waste land was the lowest,1.952 hm2.Average yield of per unit area of forest waste land was the highest,7.502 kg·hm-2,forest land was the lowest,1.518 kg·hm-2.The general yield per unit area was 5.530 kg·hm-2,and the total yield was 434.543 kg.The main environmental factors were DSF(direct site factor),soil water content and bulk density,and shallow soil(0-10 cm) exhibited more significant impacts than deep soil(10-20 cm).