Effects of applying biogas slurry on the morphological characteristics of fine roots of poplar plantations

WANG Runsong, XU Hanmei, CAO Guohua, SHEN Caiqin, RUAN Honghua

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (5) : 119-124.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (5) : 119-124. DOI: 10.12302/j.issn.1000-2006.202006052

Effects of applying biogas slurry on the morphological characteristics of fine roots of poplar plantations

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Abstract

【Objective】 The aims of this research are to study the effect of biogas slurry on the morphological characteristics of the fine roots of poplar plantations, and to provide a theoretical basis for the scientific use of biogas slurry, optimization of fertilization techniques for poplar plantations, and promotion of sustainable management of poplar plantations.【Method】 In October 2018, four biogas slurry application levels (0, 125, 250 and 375 m3/hm2) of poplar plantations were used to drill core samples at different soil depths (0-20, ≥20-40 and ≥40-60 cm) by continuous soil drilling. In the laboratory, the living fine roots of poplar were sorted, cleaned, graded, scanned, dried and weighed, and the average diameter, average length and specific root length of 1-5 grade fine roots in different soil layers were compared under different treatments. 【Result】 With the increase of biogas slurry application amount, the average diameter and length of fine roots of poplar plantation at all levels showed a decreasing trend, while the specific root length showed an increasing trend. However, different root layers fine root morphological characteristics of different soil layers respond differently to the biogas: with the deepening of soil layer and the increase of fine root order, the variation amplitude of average diameter, average root length and specific root length of fine roots decreased.【Conclusion】 The long-term application of biogas slurry reduced the average diameter and length and increased the specific root length of fine roots in poplar plantations, especially in the topsoil and lower order of fine roots.

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biogas slurry / poplar plantation / fine root / morphological characteristics

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WANG Runsong , XU Hanmei , CAO Guohua , et al . Effects of applying biogas slurry on the morphological characteristics of fine roots of poplar plantations[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2021, 45(5): 119-124 https://doi.org/10.12302/j.issn.1000-2006.202006052

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Abstract
树木细根具有高度的结构和功能的异质性。近20年来, 人们逐渐认识到采用某一直径阈值来定义细根并开展研究的方法(即直径法)不能准确地描述相关的生理学和生态学过程。随着越来越多的研究证实根系功能与其分支等级密切相关, 根序划分的方法(即根序法)在根系研究中得到更多的应用。但是, 采用根序法测定相关功能属性需耗费大量的人力和时间。最近, 有研究者在结合直径法和根序法优点的基础上提出了功能划分的方法。该方法将传统的细根区分为吸收根和运输根, 在充分考虑根系结构和功能联系的同时, 又能兼顾研究工作的效率和结果间的可比性, 特别适用于根系生物量与周转的研究。采用功能划分方法来研究根系生物量(包括其他功能属性)是一个较新的观点, 研究结果的规律性和存在的主要问题仍有待总结。该文作者通过查阅近年来的相关研究报告发现吸收根与运输根生物量在树种间存在较大的差异, 目前对吸收根生物量在全球尺度上的变异格局并不清楚, 吸收根与运输根对细根生物量周转的相对贡献有待探究, 运输根在界定上存在着很大的挑战性。该文最后讨论了在根系研究中应用功能划分方法的优势与不足, 并提出了建议。
GU J C, WANG D N, XIA X X, et al. Applications of functional classification methods for tree fine root biomass estimation:Advancements and synjournal[J]. Chin J Plant Ecol, 2016, 40(12):1344-1351.
https://doi.org/10.17521/cjpe.2016.0167
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