川黄柏一年生实生苗质量的分级标准

LIU Nianyuan,ZHONG Qingshan,XIANG Zuheng,PENG Xianfeng,ZENG Huijie,XIANG Hua,XIANG Ming,XIANG Caihai,HUANG Zhengming

Journal of Jishou University(Natural Science Edition)（2021）

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Abstract

为有利于指导生产实践,推动川黄柏实生苗培育规范化、标准化,以湖南省龙山县大安乡2020年培育的川黄柏1年生实生苗为研究对象,以72个1m×1m样方2564株样苗为研究样本,以地径、苗高为苗木质量分级指标,采用K-均值聚类法及标准差法,划分质量分级值.经综合评定,确定川黄柏1年生实生苗质量分级标准为Ⅰ级苗地径D≥1 cm,苗高H≥100 cm;Ⅱ级苗地径D0.6～＜1 cm,苗高H 60～＜100 cm;Ⅲ级苗地径D＜0.6 cm,苗高H＜60 cm.在该标准下,本次研究样本Ⅰ、Ⅱ级苗占比64.8％.

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