Seasonal Variation of Plant Organ-Litter-Soil Stoichiometry in

WANG Yajuan; CHEN Yunming; SUN Yarong; ZHAO Min; XUE Wenyan; LIU Le

doi:10.13870/j.cnki.stbcxb.2022.04.043

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Seasonal Variation of Plant Organ-Litter-Soil Stoichiometry in

更新时间：2025-03-12

- Seasonal Variation of Plant Organ-Litter-Soil Stoichiometry in
- Vol. 36, Issue 4, Pages: 350-356(2022)
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨陵,712100
  2. 中国科学院水利部水土保持研究所, 陕西杨陵,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.04.043
  CLC： S791.254
- Published：2022
- 稿件说明：
移动端阅览
WANG Yajuan, CHEN Yunming, SUN Yarong, et al. Seasonal Variation of Plant Organ-Litter-Soil Stoichiometry in[J]. 2022, 36(4): 350-356.
DOI：

WANG Yajuan, CHEN Yunming, SUN Yarong, et al. Seasonal Variation of Plant Organ-Litter-Soil Stoichiometry in[J]. 2022, 36(4): 350-356. DOI： 10.13870/j.cnki.stbcxb.2022.04.043.

摘要

为了解黄土丘陵区油松人工林植物器官—凋落物—土壤的化学计量特征随季节的变化规律，通过时空替代法、野外调查取样与室内试验的手段，以陕西省延安市安塞区纸坊沟流域中林龄油松（Pinus tabuliformis）人工林为对象，分析了4—10月油松不同器官—凋落物—土壤的碳（C）、氮（N）、磷（P）生态化学计量学特征。结果表明：（1）从4—10月，叶片C、P含量逐渐上升，在10月最高，叶片的N含量和N：P及枝的N、P含量均先减小后增大，且均在8月最低，而枝的C：N及C：P和细根的C：P、N：P均先增大后减小，且均在8月最高。土壤C、N含量、C：P、N：P先增大后减小，在8月最高。凋落物N含量、C：P和N：P均呈先降后升的趋势，在6月最低，P含量变化不显著；（2）除叶片4—6月、细根4—8月N：P>14外，其他各器官4—10月均N：P<14，该区域油松生长主要受N限制；（3）叶片与凋落物的C、N含量及C：N之间均呈显著正相关，C：N、C：P与N：P之间均呈显著正相关（p<0.05）。叶片N：P与土壤C：N呈极显著负相关（p<0.01），其他化学计量特征之间均无显著相关性。凋落物C含量与土壤P含量呈显著正相关（p<0.05）。研究结果使人工林生态化学计量学的研究更加系统性，为黄土丘陵区植被良好生长提供参考依据。

Abstract

To understand the seasonal variation of plant organs-litter-soil stoichiometry in Pinus tabulaeformis plantation in Loess Hilly region

the field investigation and laboratory experiments were used by means of spatio-temporal substitution method in Zhifanggou Watershed

Ansai District

Yan'an City

Shaanxi Province

China. The ecological stoichiometry characteristics of carbon (C)

nitrogen (N) and phosphorus (P) in different organs-litter-soil of Pinus tabulaeformis from April to October were analyzed. The results showed that:(1) From April to October

the contents of C and P in leaves increased gradually

and reached the highest in October. The contents of N and N:P in leaves and branches decreased first and then increased

and reached the lowest in August. While the contents ofC:N and C:P in branches and C:P and N:P in fine roots increased first and then decreased

and reached the highest in August. Soil C and N contents

C:P and N:P increased first and then decreased

and reached the highest value in August. Litter N content

C:P and N:P all showed a trend of decreasing first and then increasing

and reached the lowest in June

while P content had no significant change. (2) Except for N:P>14 in leaves from April to June and fine roots from April to August

N:P<14 in other organs from April to October

the growth of Pinus tabulaeflorus in this region was mainly restricted by N. (3) There were significant positive correlations between C and N contents and C:N of leaf and litter

and there were significant positive correlations between C:N

C:P and N:P (p<0.05). There was a significant negative correlation between leaf N:P and soil C:N (p<0.01)

but no significant correlation between other stoichiometric characteristics. There was a significant positive correlation between litter C content and soil P content (p<0.05). The results make the study of ecological stoichiometry of plantation more systematic and provide reference for vegetation growth in loess hilly region.

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