|本期目录/Table of Contents|

[1]白卓青,张化永,邹恒超,等.冀西北山地森林白桦分枝微量元素相对重要性研究[J].江苏农业科学,2023,51(21):146-154.
　Bai Zhuoqing,et al.Study on relative importance of trace elements in forest branches of Betula platyphylla in mountains area of northwestern Hebei[J].Jiangsu Agricultural Sciences,2023,51(21):146-154.
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冀西北山地森林白桦分枝微量元素相对重要性研究(PDF)
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《江苏农业科学》[ISSN:1002-1302/CN:32-1214/S]

卷:
第51卷
期数:
2023年第21期
页码:
146-154
栏目:
园艺与林学
出版日期:
2023-11-05

文章信息/Info

Title:
Study on relative importance of trace elements in forest branches of Betula platyphylla in mountains area of northwestern Hebei
作者:
白卓青; 张化永; 邹恒超; 黄头生; 郑玉; 甄欣欣
华北电力大学工程生态学与非线性科学研究中心，北京102206
Author(s):
Bai Zhuoqing; et al
关键词:
白桦; 微量元素; 分枝长度; 分枝直径; 分枝生物量; 相对重要性
Keywords:
-
分类号:
S792.153；S718.5
DOI:
-
文献标志码:
A
摘要:
微量元素对植物各部分结构的生长发育都具有重要的调控作用，在森林生态学中一直受到广泛关注。然而，微量元素对分枝生长的影响程度尚不明确。以10株冀北山地优势树种白桦为研究对象，对其分枝长度、直径、生物量及分枝中7种微量元素(Mn、B、Fe、Zn、Ni、Mo和Cu)含量进行测量和分析。采用相关性热图，分析微量元素之间、微量元素与分枝性状之间的相互影响。使用3种机器学习模型(随机森林、BP神经网络和KNN模型)来量化7种微量元素对枝长、枝径和枝生物量的相对重要性。结果表明，微量元素与枝长、枝径和枝生物量相关性较强，均为极显著正相关(P<0.001)。随机森林模型对枝长(r2=0.765、P<0.01)、枝径(r2=0.846、P<001)和枝生物量(r2=0949、P<0.01)的预测精度相对更高，是量化微量元素对树冠生长影响程度的最佳模型。随机森林特征值排序结果显示，影响3种分枝特征最重要的微量元素各不相同，其中，Mn对枝长影响的重要性程度最高(0.338)，Zn对枝生物量影响的重要性程度最高(0.316)，而Ni对枝径影响的重要性程度最高(0.257)。该研究为评估白桦的生长模式提供了一种有效的方法，并提高了对微量元素如何调节树枝性状和营养分配的认识。
Abstract:
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备注/Memo

备注/Memo:
收稿日期：2023-02-06
基金项目：国家“十三五”水体污染控制与治理科技重大专项(编号：2017ZX07101002)。
作者简介：白卓青(1997—)，女，河北张家口人，硕士研究生，主要从事生态学研究。E-mail：120202209079@ncepu.edu.cn。
通信作者：张化永，博士，教授，主要从事生态工程学、恢复生态学等研究。E-mail：rceens@ncepu.edu.cn。
更新日期/Last Update: 2023-11-05