线性及机理模型的种子风传扩散距离预测

Prediction of wind dispersal distance of seeds based on linear and mechanistic models

以入侵植物加拿大一枝黄花为研究对象,通过室内风洞试验构建的线性模型,与基于沉降速度的机理模型,预测了加拿大一枝黄花种子的扩散距离.预测结果表明,加拿大一枝黄花种子的扩散距离随着风速和种子释放高度的增加显著变远,机理模型预测的种子扩散距离普遍远于线性模型.在风速14 km.h-1和种子释放高度200 cm时,线性模型和机理模型预测的种子最远扩散距离分别为205 m和757 m,分别有0.2%和6.6%的种子扩散超过了200 m.该结果表明,加拿大一枝黄花种子具有远距离风传扩散的潜在能力.

A linear seed wind dispersal model based on the wind-tunnel experiments and a settlement-velocity-based mechanistic model were built to predict the dispersal distance of Solidago canadensis seed.Results demonstrated the seed dispersal distance significantly increased with the increasing wind speed and seed release height.Results also suggested that the mechanistic model generally predicted a greater dispersal distance than the linear model.The maximum seeds dispersal distance from the linear model and the mechanistic model were 205 m and 705 m,respectively,at wind speeds of 14 km·h-1 and release heights of 200 cm.The probability of seeds which could dispersed over 200 m were 0.2% and 6.6%,respectively.These results demonstrated that Solidago canadensis seeds can be dispersed long distance by wind.