5种阔叶树穴盘苗分级标准研究

The Journal of Hebei Forestry Science and Technology(2019)

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Abstract
为探讨阔叶树穴盘苗质量分级标准.以4个月苗龄的五角枫、杜梨、黄菠萝、水曲柳、皂荚穴盘苗为试验材料,选择苗高和地径作为苗木分级指标,采用逐步聚类分析方法对其分级标准进行初步探讨.经过分析计算,将各树种穴盘苗分为3级,初步得出各苗木等级的划分标准.分别为五角枫Ⅰ级苗H≥41.0、D≥0.47,Ⅱ级苗32.7≤H<41.0、0.44≤D<0.47,Ⅲ级苗H<32.7、D<0.44;杜梨Ⅰ级苗H≥41.1、D≥0.57,Ⅱ级苗35.3≤H<41.1、0.51≤D<0.57,Ⅲ级苗H<35.3、D<0.51;黄菠萝Ⅰ级苗H≥22.7、D≥0.44,Ⅱ级苗14.3≤H<22.7、0.37≤D<0.44,Ⅲ级苗H<14.3、D<0.37;水曲柳Ⅰ级苗H≥27.2、D≥0.51,Ⅱ级苗21.9≤H<27.2、0.43≤D<0.51,Ⅲ级苗H<21.9、D<0.43;皂荚Ⅰ级苗H≥26.5、D≥0.48,Ⅱ级苗22.8≤H<26.5、0.42≤D<0.48,Ⅲ级苗H<22.8、D<0.42.
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