Effects of Understory Vegetation on Soil Phosphorus Morphological and Availability in

ZHU Zhengqing; MAN Xiuling

doi:10.13870/j.cnki.stbcxb.2024.02.031

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Effects of Understory Vegetation on Soil Phosphorus Morphological and Availability in

更新时间：2025-03-12

- Effects of Understory Vegetation on Soil Phosphorus Morphological and Availability in
- Vol. 38, Issue 2, Pages: 339-350(2024)
- 作者机构：
  
  东北林业大学林学院,哈尔滨,150040
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2024.02.031
  CLC： S714
- Published：2024
- 稿件说明：
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ZHU Zhengqing, MAN Xiuling. Effects of Understory Vegetation on Soil Phosphorus Morphological and Availability in[J]. 2024, 38(2): 339-350.
DOI：

ZHU Zhengqing, MAN Xiuling. Effects of Understory Vegetation on Soil Phosphorus Morphological and Availability in[J]. 2024, 38(2): 339-350. DOI： 10.13870/j.cnki.stbcxb.2024.02.031.

摘要

[目的] 由于大兴安岭寒温带兴安落叶松林下植被差异较大

其土壤理化性质也有较大差异

研究不同林下植被兴安落叶松林土壤磷形态变化特征及有效性

为科学评价寒温带森林土壤磷素供给水平及磷循环研究提供科学数据。[方法] 选取大兴安岭寒温带4种林下植被兴安落叶松林(兴安杜鹃—落叶松林、杜香—落叶松林、苔草—落叶松林和苔藓—落叶松林)为研究对象

于2022年6

10月采集0—5

5—10

10—20 cm土层土壤样品

采用Hedley磷分级法测定土壤不同形态磷含量。[结果] (1)观测期间4种林下植被兴安落叶松林土壤活性磷(H2O—Pi、NaHCO3—Pi、NaHCO3—Po)和中等活性磷(NaOH—Pi、NaOH—Po)在6—10月总体呈降低趋势

中等活性磷含量占全磷的30.08%~52.80%

且中等活性磷均表现出无机磷含量高于有机磷含量。兴安杜鹃—落叶松林和杜香—落叶松林0—20 cm土层活性磷、中等活性磷含量均高于苔草—落叶松林和苔藓—落叶松林。苔草—落叶松林土壤稳定性磷(HCl—Pi、HCl—Po、residual—P)均显著高于其他3种落叶松林

且稳定性磷占全磷的58.86%~65.81%。(2)4种林下植被落叶松林土壤全磷(TP)、有效磷(AP)和磷活化系数(PAC)在6—10月变化范围分别为391.81~1 081.02

7.34~83.90 mg/kg和1.62%~7.76%

兴安杜鹃—落叶松林和杜香—落叶松林土壤AP含量和PAC高于另外2种落叶松林

表现出较高的磷有效性;而苔草—落叶松林和苔藓—落叶松林在8

10月5—10

10—20 cm土层则出现供磷不足现象。(3)土壤含水率是兴安杜鹃—落叶松林和杜香—落叶松林土壤磷的主要影响因素

可溶性碳是苔草—落叶松林的主要影响因素

而铵态氮对苔藓—落叶松林影响较大。[结论] 林下植被对兴安落叶松林土壤磷形态及磷有效性有显著影响

兴安杜鹃—落叶松林和杜香—落叶松林土壤活性磷组分、中等活性磷组分及有效磷含量较高

磷活化系数均在2.00%以上;而苔草—落叶松林土壤稳定性磷组分含量较高

土壤磷有效性相对较低。研究结果对寒温带森林生态系统林下植被生态功能及土壤养分循环研究具有重要意义。

Abstract

[Objective] Due to the large differences in understorey vegetation and soil physicochemical properties of Larix gmelinii forest in the cold temperate zone of the Rreater Khingan Mountains

the characteristics and availability of soil phosphorus morphological changes of Larix gmelinii forest under different forests were studied

so as to provide scientific data for scientific evaluation of soil phosphorus supply level and phosphorus cycle in the cold temperate zone forest. [Methods] Four kinds of understory vegetation in the cold temperate zone of the Greater Khingan Mountains

namely

Larix gmelinii forest (Rhododendron simsii-Larix gmelinii forest

Rhododendron tomentosum-Larix gmelinii forest

Carex schmidtii-Larix gmelinii forest and Moss-Larix gmelinii forest) were selected as the research objects. Soil samples from the 0—5 cm

5—10 cm and 10—20 cm soil layer were collected from June

August and October 2022. Hedley phosphorus classification method was used to determine the phosphorus content of different forms in soil. [Results] (1) During the observation period

soil active phosphorus (H2O—Pi

NaHCO3—Pi

NaHCO3—Po) and medium active phosphorus (NaOH—Pi

NaOH—Po) of the four understorey vegetation Larix gmelinii forest showed a decrease trend from June to October

and the content of medium active phosphorus accounted for 30.08% to 52.80% of total phosphorus.The content of inorganic phosphorus was higher than that of organic phosphorus. The content of active phosphorus and medium active phosphorus in 0—20 cm soil layer of Rhododendron simsii-Larix gmelinii forest and Rhododendron tomentosum-Larix gmelinii forest were higher than those of the Carex schmidtii-Larix gmelinii forest and Moss-Larix gmelinii forest. The soil stability phosphorus (HCl—Pi

HCl—Po

and residual—P) in the Carex schmidtii-Larix gmelinii forest was significantly higher than that in the other three larix forests

and the stable state phosphorus accounted for 58.86%~65.81% of the total phosphorus. (2) Soil total phosphorus (TP)

available phosphorus (AP) and phosphorus activation coefficient (PAC) in Larix gmelinii forest were 391.81 to 1 081.02

7.34 to 83.90 mg/kg

and 1.62% to 7.76% from June to October

respectively. The content of AP and PAC in the soil of the Rhododendron simsii-Larix gmelinii forest and Rhododendron tomentosum-Larix gmelinii forest were higher than those of the other two larix forests

showing higher phosphorus availability. On the other hand

there was insufficient phosphorus supply in the soil layer of the Carex schmidtii -Larix gmelinii forest and Moss-Larix gmelinii forest from 5—10 cm and 10—20 cm in August and October. (3) Soil moisture contentwas the main influencing factor of soil phosphorus in the Rhododendron simsii-Larix gmelinii forest and the Rhododendron tomentosum-Larix gmelinii forest

soluble carbon was the main influencing factor of the Carex schmidtii-Larix gmelinii forest

and ammonium nitrogen had a greater influence on the Moss-Larix gmelinii forest. [Conclusion] Understory vegetation had a significant effect on soil phosphorus morphological form and phosphorus availability in Larix gmelinii forest. The content of active phosphorus

medium active phosphorus and available phosphorus in the soil of Rhododendron simsii-Larix gmelinii forest and Rhododendron tomentosum-Larix gmelinii forest was higher

and the activation coefficients of P were all above 2.00%; However

the content of stable phosphorus in soil of the Carex schmidtii-Larix gmelinii forest was higher

and the availability of soil phosphorus was lower. This results are of great significance for the study of ecological function of understory vegetation and soil nutrient cycle in the cold temperate forest ecosystem.

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Keywords

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