Stoichiometric Characteristics of the Litter-Soil Continuum in Sand Fixation Forest of the Mu Us Sandy Land

YANG Jing; ZHANG Yanwen; LI Can; TUO Weiwei; WANG Yicong; DONG Wenxuan; TONG Xiaogang

doi:10.13870/j.cnki.stbcxb.2023.03.044

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Stoichiometric Characteristics of the Litter-Soil Continuum in Sand Fixation Forest of the Mu Us Sandy Land

更新时间：2025-03-12

- Stoichiometric Characteristics of the Litter-Soil Continuum in Sand Fixation Forest of the Mu Us Sandy Land
- Vol. 37, Issue 3, Pages: 345-352(2023)
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所, 陕西杨凌,712100
  2. 西北农林科技大学资源环境学院, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.03.044
  CLC： S791.25
- Published：2023
- 稿件说明：
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YANG Jing, ZHANG Yanwen, LI Can, et al. Stoichiometric Characteristics of the Litter-Soil Continuum in Sand Fixation Forest of the Mu Us Sandy Land[J]. 2023, 37(3): 345-352.
DOI：

YANG Jing, ZHANG Yanwen, LI Can, et al. Stoichiometric Characteristics of the Litter-Soil Continuum in Sand Fixation Forest of the Mu Us Sandy Land[J]. 2023, 37(3): 345-352. DOI： 10.13870/j.cnki.stbcxb.2023.03.044.

摘要

为揭示不同固沙林模式恢复过程中主要养分含量变化关系与差异特征。以榆林毛乌素沙区半固定沙地以及恢复25~56年的人工灌木和乔木林地为对象

测定和分析从枯落物层到腐殖质层

再到矿质土层碳(C)、氮(N)、磷(P)含量及其化学计量比随恢复年限和连续体剖面的动态变化特征及相关关系。结果表明:不同恢复年限2种林地C、N、P含量及其化学计量均表现为枯落物层＞腐殖质层＞矿质土层。但随林地恢复年限延长

2种林地枯落物、腐殖质及矿质土层C含量均显著增加

到恢复56年时

分别比半固定沙地平均增加1.76

35.70

6.45倍;P含量在腐殖质层和矿质土层中显著增加

平均增幅分别为1.67

2.11倍;N含量仅在矿质土层显著增加

平均增幅为4.16倍。2种林地化学计量变化则表现为

随恢复年限延长

腐殖质层C∶N呈显著增加趋势

到恢复56年时

比半固定沙地平均增长18.6倍;N∶P只在灌木连续体中显著增加

C∶P未显著变化。相关分析表明

2种林地连续体各层间C含量均达到极显著正相关

矿质土层C与N、P之间也呈极显著正相关

腐殖质层C∶N、C∶P与矿质土层C∶P均呈极显著正相关。综上

榆林毛乌素沙地植被恢复过程中

枯落物—土壤连续体C含量为协同增长

N、P含量仅在矿质土层中增长明显

C∶P是连续体中相对平衡稳定的化学计量特征。

Abstract

To reveal the evolution of C

and P contents and ecological stoichiometric ratios along the litter-soil continuum during the restoration of sand-fixing forests

artificial shrub and arbor stands with 25-56 years restoration in the Mu Us sandy land of Yulin were taken as the study object

we measured and analyzed the dynamics of carbon (C)

nitrogen (N)

phosphorus (P) contents

and their stoichiometric ratios along the restoration years and continuum profiles in semi-fixed sandy sites

from the litter layer to the humus layer and then to the mineral soil layer. The results showed that the C

and P contents and their stoichiometry in the two types of woodland at different restoration years were all in the litter layer > humus layer > mineral soil layer. However

the C content of the litter

humus and mineral soil layers increased significantly with the extension of the restoration period

with an average increase of 1.76

35.70

and 6.45 times compared with that of the semi-fixed sandy land at 56 years; the P content increased significantly in the humus and mineral soil layers

with an average increase of 1.67 and 2.11 times

respectively; the N content increased significantly only in the mineral soil layer

with an average increase of 4.16 times. The change in stoichiometry of the two woodlands showed a significant increase in C∶N in the humus layer with the increase of restoration years

with an average increase of 18.6 times compared with the semi-fixed sandy land at 56 years; N∶P increased significantly only in the shrub continuum; C∶P did not change significantly. Correlation analysis showed that the C content of all layers in the two woodland continuums reached a highly significant positive correlation

and the C of the mineral soil layer was also highly significantly positively correlated with N and P. The C∶N and C∶P of the humus layer were highly significantly positively correlated with the C∶P of the mineral soil layer. In conclusion

the C content of the litter-soil continuum increased synergistically during the vegetation restoration process in Yulin Mu Us sandy land

while the N and P contents increased significantly only in the mineral soil layer

and C∶P was a relatively balanced and stable stoichiometric feature in the continuum.

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Keywords

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