Variation of Stoichiometric Characteristics of Soil Nutrients in Collapse Mound of Eroded Red Soil Region

JIANG Chao1; 2; CHEN Zhibiao1; 2; 3; CHEN Zhiqiang1; 2; 3; CHEN Haibin1

doi:10.13870/j.cnki.stbcxb.2016.06.033

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Variation of Stoichiometric Characteristics of Soil Nutrients in Collapse Mound of Eroded Red Soil Region

更新时间：2025-03-12

- Variation of Stoichiometric Characteristics of Soil Nutrients in Collapse Mound of Eroded Red Soil Region
- Vol. 30, Issue 6, Pages: 193-200(2016)
- 作者机构：
  
  1. 湿润亚热带山地生态国家重点实验室培育基地,福州,350007
  2. 福建师范大学地理科学学院,福州,350007
  3. 福建师范大学地理研究所,福州,350007
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2016.06.033
  CLC： S157.1
- Published：2016
- 稿件说明：
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JIANG Chao1, 2, CHEN Zhibiao1, et al. Variation of Stoichiometric Characteristics of Soil Nutrients in Collapse Mound of Eroded Red Soil Region[J]. 2016, 30(6): 193-200.
DOI：

JIANG Chao1, 2, CHEN Zhibiao1, et al. Variation of Stoichiometric Characteristics of Soil Nutrients in Collapse Mound of Eroded Red Soil Region[J]. 2016, 30(6): 193-200. DOI： 10.13870/j.cnki.stbcxb.2016.06.033.

摘要

以福建省西南部长汀县濯田镇黄泥坑崩岗群内植被盖度分别为2%，20%和95%的3处相邻崩岗为研究对象，对各崩岗内集水坡面、崩壁（顶部、中部及底部）、崩积体（上部和下部）和沟道出口7个典型部位0—10，10—20，20—30 cm土壤基本理化性质进行测定，分析了各植被盖度崩岗不同深度及部位土壤化学计量比的空间分异规律。结果表明：随着植被盖度的升高，土壤养分含量及化学计量比显著增加（除全磷含量和P/K以外）；随着土壤深度的增加，有机碳、全氮和全钾含量以及C/N、C/P、C/K和N/P总体上呈减少趋势，全磷含量以及N/K和P/K基本维持稳定；沿集水坡面→崩壁→崩积体→沟道出口，有机碳、全氮和全钾含量以及C/N、C/P、C/K、N/P和N/K基本表现为先减少再增加最后亦降低的变化趋势，全磷含量和N/P无明显差异；土壤化学计量特征与土壤养分含量、粉粒含量、容重、含水量和pH具有较强的相关关系。崩岗系统土壤物理结构较差，养分含量普遍较低，其中有机碳、全氮和全磷含量存在不同程度的限制。

Abstract

3 adjacent typical collapse mounds (Ⅰ

Ⅱ and Ⅲ) were selected in Huangniken collapse mound group in Zhuotian Town

Changting County of southwestern Fujian Province

in which vegetation coverage of each collapse mound was 2%

20% and 95%

respectively; seven plots including upper catchment

collapsing wall (top

middle and bottom part)

colluvial deposit (upper and lower part) and channel outlet for each collapse mound were sampled

and the main physical and chemical properties including particle composition

bulk density

water content

pH value

soil organic carbon (SOC)

total nitrogen (TN)

total phosphorus (TP) and total potassium (TK) in 3 depths (0—10 cm

10—20 cm and 20—30 cm) of each plot were measured. Meanwhile

spatial variation of the contents of SOC

TK and their stoichiometric characteristics in each collapse mound with different depth and position were analyzed in this paper. The results indicated that with improvement of vegetation coverage (fromⅠto Ⅲ)

the contents of SOC

TK and their stoichiometric ratios increased significantly with the exception of TP content and P/K

and the order of increasing range of soil nutrients was SOC＞TN＞TK＞TP

while that of soil stoichiometric ratios was C/P＞C/K＞C/N＞N/K＞N/P＞P/K. Under different depth (from 0—10 cm to 20—30 cm)

the contents of SOC

TK and the ratios of C/N

C/P

C/K and N/P generally decreased

while the content of TP and the ratios of N/K and P/K basically remained stable. Variation of soil nutrient contents and their stoichiometric ratios for different position were greatly obvious in each collapsing hill: the contents of SOC

C/N and C/P

C/K

N/P and N/K showed a down-up-down variation tendency along the runoff routes from upper catchment to channel outlet via collapsing wall and colluvial deposit

while TP content and P/K ratio kept relatively consistent. Besides

soil stoichiometry was closely related to nutrient content

silt content

bulk density

water content and pH value by stepwise regression analysis. In summary

the contents of C

N and P were at very low level

especially P content in the severely eroded context of collapse mound.

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