市面上的%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF种类比较繁多，缺少购买经验的消费者很容易就会买到残次品，有些商家都会以紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF来冒充铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF，让人难以分辨。那么，铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF和紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF问什么难以分辨呢?

铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF和紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF难以分辨的原因

就功用上，铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF与紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF很相近，但在有效成分种类、含量和质量上，铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF远优于紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF，因此铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF的营养价值是紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF的4到5倍。铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF价格远远高于紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF，而紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF则相对便宜很多，一般仅为铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF的1/5-1/4。其原因除了铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF拥有超高利用价值外，更苛刻的种植环境和生长周期及产量也是主要因素。

铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF与紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF的生长环境区别不大，但紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF比铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF更能适应环境，成活率更高，生长更快，地生长周期也就较短，原料获取也更方便容易，生产成本就相应地降低。在苗期，铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF与紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF的外观上几乎没有什么区别，而且长成后的铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF和紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF相似度也很高，最大的区别还在于枝条长度和粗细上，特别是纯种软脚铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF，分节比较多，节短而粗壮，呈两头细中间粗的形态，枝条一般不超过750mm;而紫皮枝条一般长于1000mm，外皮也如其名多带紫红色。

铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF与紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF制成干品后，在外观上就更难区分，食用上也相对较难，但在鲜品时的食用口感差别也是比较明显的。紫皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF咀嚼时会有些涩口，渣多且会塞牙;而铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF入口有清香味，口感很糯，咀嚼后只会有少量残渣，而极品铁皮%E6%BE%B3%E9%97%A8%E5%A4%AA%E9%98%B3%E9%9B%86%E5%9B%A2%E8%91%A3%E4%BA%8B%E9%95%BF则几乎没有残渣。

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