Soil Stoichiometry Characteristics of Artificial Caragana Korshinskii Shrubs with Different Density in Desert Steppe

YANG Yang; LIU Bing-ru; YANG Xin-guo; HAN Cong-cong

doi:10.13961/j.cnki.stbctb.2014.05.019

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Soil Stoichiometry Characteristics of Artificial Caragana Korshinskii Shrubs with Different Density in Desert Steppe

- Soil Stoichiometry Characteristics of Artificial Caragana Korshinskii Shrubs with Different Density in Desert Steppe
- Bulletin of Soiland Water Conservation Vol. 33, Issue 5, Pages: 67-73(2014)
- 作者机构：
  
  宁夏大学西北退化生态系统恢复与重建教育部重点实验室,宁夏,银川,750021
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.05.019
  CLC：
- Published：2014
- 稿件说明：
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YANG Yang, LIU Bing-ru, YANG Xin-guo, et al. Soil Stoichiometry Characteristics of Artificial Caragana Korshinskii Shrubs with Different Density in Desert Steppe[J]. Bulletin of Soiland Water Conservation, 2014, 33(5): 67-73.
DOI：

YANG Yang, LIU Bing-ru, YANG Xin-guo, et al. Soil Stoichiometry Characteristics of Artificial Caragana Korshinskii Shrubs with Different Density in Desert Steppe[J]. Bulletin of Soiland Water Conservation, 2014, 33(5): 67-73. DOI： 10.13961/j.cnki.stbctb.2014.05.019.

摘要

为了揭示人工灌草结合的生态系统土壤内部C

P平衡和循环过程

以荒漠草原为对照(CK)

研究了相同林龄不同密度(高密度HD、中密度MD、低密度LD)人工柠条灌丛土壤化学计量特征。结果表明

柠条灌丛0-100 cm土层平均有机碳(SOC)、全氮(TN)

全磷(TP)和氮磷比(N/P)随密度的增加呈上升趋势

碳氮比(C/N)

碳磷比(C/P)呈降低趋势

其中TP的空间变异性较高;垂直方向SOC

C/N和C/P随土层深度的增加呈单峰曲线

TP和N/P在0-40 cm土层呈锐减趋势

40 cm土层以下缓慢降低并趋于稳定;0-40 cm土层TN和TP含量占总含量的61.82%和55.56%

可作为密度变化对人工柠条灌丛土壤养分的敏感指标;相关分析结果发现

人工柠条灌丛土壤N和P含量呈极显著正相关(p<0.01)

二者均与C/N呈极显著的负相关(p<0.01)

说明柠条对土壤中N和P两种元素需求相一致。

Abstract

Taking the natural desert steppe as CK

soil stoichiometry characteristics of artificial Caragana korshinskii shrubs with different density(HD

LD) of the same forest age were investigated to reveal soil C

P balance and internal circulation in artificial shrub-grass ecological system. The results showed that with the increase of the density

soil organic carbon(SOC)

total nitrogen(TN)

total phosphorus(TP) and ratio of nitrogen to phosphorus(N/P) in 0-100 cm presented an increase trend

while the ratio of carbon to nitrogen(C/N) and carbon to phoshorus(C/P) presented a decrease trend

and the variation coefficient of TP was higher than other soil stoichiometry; Vertical direction SOC

C/N and C/P showed unimodal curve with the increase of soil depth

while TN

TP and N/P showed a sharply decrease trend in 0-40 cm soil layer with the increase of soil depth

but in 40-100 cm soil layer showed a slow decrease and tended to be stable. In 0-40 cm soil

TN and TP accounted for 61.82% and 55.56% of total content

and the content of TN and TP soil could be used as artificial C. microphylla shrubs sensitive index of soil nutrients; Correlation analysis showed that N content was positively linearly correlated with P content(p<0.01)

and both was significantly negative correlated with C/N(p<0.01)

and indicates consistent demand of N and P content in soil for C. microphylla shrubs.

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