Effects of Nitrogen Addition on Leaf Stoichiometry and Nutrients Reabsorption Efficiency of

LI Suxin; ZHANG Yunxiang; GUO Jinping

doi:10.13870/j.cnki.stbcxb.2021.05.034

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Effects of Nitrogen Addition on Leaf Stoichiometry and Nutrients Reabsorption Efficiency of

更新时间：2025-03-12

- Effects of Nitrogen Addition on Leaf Stoichiometry and Nutrients Reabsorption Efficiency of
- Vol. 35, Issue 5, Pages: 249-254(2021)
- 作者机构：
  
  1. 山西农业大学林学院, 山西太谷,030801
  2. 功能油料树种培育与利用山西省重点实验室, 山西太谷,030801
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.05.034
  CLC： S714
- Published：2021
- 稿件说明：
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LI Suxin, ZHANG Yunxiang, GUO Jinping. Effects of Nitrogen Addition on Leaf Stoichiometry and Nutrients Reabsorption Efficiency of[J]. 2021, 35(5): 249-254.
DOI：

LI Suxin, ZHANG Yunxiang, GUO Jinping. Effects of Nitrogen Addition on Leaf Stoichiometry and Nutrients Reabsorption Efficiency of[J]. 2021, 35(5): 249-254. DOI： 10.13870/j.cnki.stbcxb.2021.05.034.

摘要

为了解华北落叶松林叶片化学计量特征和养分重吸收效率与N素供应的关系，以24年生华北落叶松人工林为研究对象，设置3个水平（0，8，15 g/（m2·a））连续6年的野外氮添加控制试验，测定氮添加后华北落叶松成熟叶片、凋落叶片和林分土壤养分含量的变化。结果表明：成熟叶片C含量在年际间差异显著（P<0.05），氮添加显著增加成熟叶2016—2018年的C、N含量，降低2018年的P含量，导致2018年N/P在轻度氮添加下比对照增加20.20%，重度氮添加下增加34.43%，2018年N/P在重度氮添加下出现峰值20.50，表明氮添加在一定程度上驱动该林分生长的P养分限制；凋落叶中的C、N、P含量及化学计量在年际间和氮添加处理下均呈显著差异（P<0.05），氮添加显著增加凋落叶2016—2018年的C含量、C/P和N/P，显著降低2016—2018年的P含量；2016—2018年，轻度氮添加下NRE （氮重吸收效率）和NRE/PRE （氮重吸收效率/磷重吸收效率）显著降低，氮添加下PRE （磷重吸收效率）显著增加；相关分析表明，NRE与凋落叶N含量，PRE与凋落叶P含量呈显著负相关，相关系数分别为-0.860和-0.772；氮添加显著增加土壤有效氮的含量，降低土壤pH （除2016年）和速效磷含量。氮添加导致华北山地针叶林树木生长受不同程度的P养分限制，推测氮添加驱动的林分受P限制可能与该区土壤养分初始状况有关，为全球气候变化下森林的养分管理提供参考依据。

Abstract

Our objective was to understand the relationship between leaf stoichiometric characteristics

nutrients reabsorption efficiency and nitrogen (N) supply of Larix principis-rupprechtii. We selected 24-year-old Larix principis-rupprechtii plantation as study object

and set up a 3-level (0

8 and 15 g/(m2·a)) field experiment of N addition for 6 years to explore the change of mature leaves

leaves litter and soil nutrients contents. The results showed that the content of C in mature leaves was significantly different among years. The N addition significantly increased the C and N contents of mature leaves in 2016-2018

and decreased the P content in 2018

resulting in an increase of 20.20% in N/P ratio under light nitrogen addition and 34.43% under heavy nitrogen addition in 2018

and a peak of 20.50 in N/P ratio under heavy N addition in 2018

which indicated that N addition could drive the P nutrient limitation of the stand growth to a certain extent. The contents and stoichiometry of C

N and P in leaves litter were significantly different between years and different N addition. The N addition significantly increased the C content

C/P and N/P of leaves litter in 2016-2018

and significantly decreased the P content in 2016-2018. NRE and NRE/PRE decreased significantly under light N addition

while PRE increased significantly under N addition in 2016-2018. Correlation analysis showed that there were significant negative correlations between NRE and leaf N contents

and between PRE and leaf P contents

with the correlation coefficients of -0.860 and -0.772 respectively. The N addition significantly increased the content of soil available N

decreased soil pH (except 2016) and available P content. The results indicated that the growth of coniferous forests in North China was limited by P in different degrees due to N addition. It was speculated that the P nutrient limitation of the forests driven by N addition might be related to the initial soil nutrient status in this region

which provided reference for forest nutrient management under global climate change.

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