不同种植模式对香榧生长及水土保持的影响

香榧是我国特有干果树种，常以香榧-中药材复合种植模式开展经营作业。通过测定香榧-艾蒿、香榧-黄精、香榧-前胡、香榧-掌叶覆盆子的林药复合种植模式的香榧生长变化指标及土壤含水量变化特征，探究香榧生长最佳、水土保持能力最优的香榧-中药材复合种植模式，为香榧复合种植不同中药材的合理性提供借鉴。研究结果表明：香榧-艾蒿、香榧-黄精是香榧树干基径增长率最高的2种模式。不同复合种植模式、不同坡位与不同的复合种植模式的中介效应可以联合解释83.4%的林下土壤含水量变化。香榧-艾蒿复合种植模式下的香榧生长情况较好、水土保持效果最佳，开展香榧经济林的林药模式复合经营时，可以考虑采用艾蒿作为药材植物。

Effects of Different Planting Modes on the Growth and Soil-water Conservation of Torreya grandis var. merrillii Hu

Torreya grandis var. merrillii Hu is a unique dry fruit tree species in China. It is usually grown together with Chinese traditional herbal plants in a compound planting mode. By measuring the growth change index of and the change characteristics of soil water content for Torreya grandis in the compound planting modes of Torreya grandis with traditional Chinese herbal plants, such as with Artemisia argyi, with Polygonatum sibiricum, with Peucedanum praeruptorum and with Rubus chingii, this study explores the compound planting mode of Torreya grandis and Chinese herbal plants with the best growth and soil-water conservation ability, so as to provide a reference for the rationality of the compound planting of Torreya grandis and different Chinese herbal plant. The study results show that Torreya grandis - Artemisia argyi and Torreya grandis - Polygonatum sibiricum are the two compound planting modes with the highest growth rate of base diameter of Torreya grandis. The intermediary effects of different compound planting modes, different slope positions and different compound planting modes can jointly explain 83.4% of the changes of soil water content under the forest. In the Torreya grandis - Artemisia argyi mode, Torreya grandis grows better and has the best soil water conservation capacity. Therefore, when conducting operation of compound planting Torreya grandis and a medicinal herbal plant, Artemisia argyi can be considered as a first choice from any medicinal herbal plants.