Effects of long-term nitrogen addition on fine root dynamics in a temperate natural secondary forest

IF 1.8 3区农林科学 Q2 FORESTRY

Scandinavian Journal of Forest Research Pub Date : 2023-04-03 DOI:10.1080/02827581.2023.2213900

Y. Xing, Guancheng Liu, Lu Liang, G. Yan, Binbin Huang, Qinggui Wang

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Abstract

ABSTRACT In order to study the response of fine root production (FRP), mortality (FRM) and turnover (FRT) to nitrogen (N) addition, we have conducted 12 years of continuous N addition experiments in the natural secondary forest in Northeast China. According to the local N deposition, three N treatments were set up. The response of FRP, FRM and FRT to N addition during the growing season was studied. The results showed that N addition would lead to phosphorus (P) limitation, and fine roots could increase the absorption of N and P by increasing their diameter. The increase in the diameter of fine roots led to a decrease in the FRT, and the soil layer also affected the FRT. Nitrogen addition increased the FRP and FRM in all soil layers. Nitrogen addition did not change the seasonal variation of FRP and FRM. The highest value of FRP occurred in May, and the lowest value of FRM occurred in August. Nitrogen addition increased the total number (TNLR) and surface area (TSALR) of live fine root in all soil layers. The TNLR and TSALR decreased with the deepening of soil layer. Collectively, fine roots may respond to environmental stress through self-regulation and changing growth strategies.

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长期施氮对温带天然次生林细根动态的影响

摘要为了研究细根产量（FRP）、死亡率（FRM）和周转率（FRT）对施氮的响应，我们在东北天然次生林中进行了12年的连续施氮试验。根据氮的局部沉积，设置了三个氮处理。研究了生长季节FRP、FRM和FRT对氮添加的响应。结果表明，氮的添加会导致磷的限制，细根可以通过增加直径来增加对氮和磷的吸收。细根直径的增加导致FRT降低，土层也影响了FRT。氮的添加增加了各土层的FRP和FRM。氮的添加并没有改变FRP和FRM的季节变化。FRP的最高值出现在5月，FRM的最低值出现在8月。施氮增加了各土层活细根的总根数（TNLR）和表面积（TSALR）。TNLR和TSALR随着土层的加深而降低。总的来说，细根可以通过自我调节和改变生长策略来应对环境压力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scandinavian Journal of Forest Research 农林科学-林学

CiteScore

3.00

自引率

5.60%

发文量

审稿时长

3.3 months

期刊介绍： The Scandinavian Journal of Forest Research is a leading international research journal with a focus on forests and forestry in boreal and temperate regions worldwide.