为了摸清杨树黄叶病害的发病原因,为杨树黄叶病害防治提供理论依据,在河南省杨树黄叶病典型发生区选择21个采样点进行叶片活性铁分析.结果表明,病叶活性铁平均含量为10.73mg/kg,显著低于健康叶片(24.99 mg/kg).通过叶面喷施、盆栽苗木根施、大树根施硫酸亚铁及病枝条在不同基质中培养等施肥诊断试验证明,补铁后能明显减轻杨树黄叶病症状或使植株恢复健康.从杨树叶片活性铁分析及施肥诊断2个方面证明,活性铁缺乏是造成杨树叶片失绿变黄的主要原因.%To clear the causes of poplar yellow leaf disease, the active iron of poplar leaves was analyzed, which were collected from 21 sampling spots in the epidemic areas of poplar yellow leaf disease. The results showed that the average content of active iron in diseased leaves was 10. 73 mg/kg, significantly lower than in healthy leaves, which was 24. 99 mg/kg. By applying both foliage spray and rhizosphere fertilization to potting seedlings and adult trees, the plant disease was either obviously mitigable or recoverable after supplying iron. Altogether, these findings proved that polar leaf chlorosis mainly resulted from the lack of active iron.
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