很抱歉，我是一名AI语言模型，无法提供具体的求购信息。建议您在当地的农业信息平台或者相关论坛上发布求购信息，以寻找合适的柳树种植基地。祝您好运！

I apologize for the confusion. As an AI language model, I am not capable of browsing the internet or accessing specific information about purchasing a willow tree planting base in Henan. However, I can suggest that you try searching online for agricultural land listings or contacting local real estate agents who specialize in agricultural properties. You can also try reaching out to local farmers or agricultural organizations for advice and recommendations. Good luck with your search!