岩溶区不同恢复阶段檵木根际土壤生态化学计量学特征

梁月明; 李强; 潘复静

doi:10.13961/j.cnki.stbctb.2017.05.021

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岩溶区不同恢复阶段檵木根际土壤生态化学计量学特征

试验研究

- 岩溶区不同恢复阶段檵木根际土壤生态化学计量学特征
- Ecological Stoichiometric Characteristics of Loropetalum Chinense Rhizosphere Soils at Different Vegetation Restoration Stage in Karst Region
- 水土保持通报 2017年37卷第5期页码：123-127
- 作者机构：
  
  1. 中国地质科学院岩溶地质研究所, 国土资源部、广西壮族自治区岩溶动力学重点实验室,广西,桂林,541000
  2. 桂林理工大学环境科学与工程学院,广西,桂林,541000
- 作者简介：
- 基金信息：
  
  广西自然科学青年基金项目“广西喀斯特地区不同石灰土中细菌群落特征解析”（2016GXNSFBA380179）;岩溶地质研究所基本科研业务费项目（2016004）;中国地质大调查项目（DD20160305）
- DOI：10.13961/j.cnki.stbctb.2017.05.021
  中图分类号：
- 纸质出版：2017
- 稿件说明：
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梁月明, 李强, 潘复静. 岩溶区不同恢复阶段檵木根际土壤生态化学计量学特征[J]. 水土保持通报, 2017,37(5):123-127.

LIANG Yueming, LI Qiang, PAN Fujing. Ecological Stoichiometric Characteristics of Loropetalum Chinense Rhizosphere Soils at Different Vegetation Restoration Stage in Karst Region[J]. Bulletin of Soiland Water Conservation, 2017, 37(5): 123-127.
梁月明, 李强, 潘复静. 岩溶区不同恢复阶段檵木根际土壤生态化学计量学特征[J]. 水土保持通报, 2017,37(5):123-127. DOI： 10.13961/j.cnki.stbctb.2017.05.021.

LIANG Yueming, LI Qiang, PAN Fujing. Ecological Stoichiometric Characteristics of Loropetalum Chinense Rhizosphere Soils at Different Vegetation Restoration Stage in Karst Region[J]. Bulletin of Soiland Water Conservation, 2017, 37(5): 123-127. DOI： 10.13961/j.cnki.stbctb.2017.05.021.

摘要

[目的] 探讨不同植被恢复阶段中檵木（Loropetalum chinense）根际土壤生态化学计量学特征，揭示岩溶石漠化区不同恢复阶段下檵木养分利用规律及限制因子，为岩溶区植被恢复与重建提供科学依据。[方法] 利用生态化学计量学方法，分析桂西北岩溶区不同植被恢复阶段（灌木林、原生林）檵木根际土壤生态化学计量学特征。[结果] 檵木根际土壤C、N、P含量表现为灌木林阶段高于原生林阶段，而C：N，C：P，N：P比值则刚好相反；同一植被恢复阶段，不同坡位间檵木根际土壤C：P与N：P比值存在显著差异；相关性分析表明，土壤C含量与土壤N：P含量存在显著正相关关系，土壤N，P均与C：N，C：P，N：P存在显著正相关关系，土壤C：P与C：N，N：P存在显著正相关关系。[结论] 檵木根际养分供应状况与其生境密切相关，在植被恢复前期（灌木林）檵木生长容易受N素限制，到植被恢复后期檵木生长易受P素限制。

Abstract

[Objective] To explore the ecological stoichiometric characteristics of Loropetalum chinense rhizosphere soils and to find out its nutrient use regularity and limiting factors at different vegetation restoration stages of karst region. These works were expected to provide scientific basis for decision making of vegetation restoration and reconstruction in the karst region of Northwest Guangxi Zhuang Autonomous Region.[Methods] Based on the ecological stoichiometry theory

we tested the C:N:P ratios of L. chinense rhizosphere soils sampled at two typical vegetation restoration stages (shrubland and primary forest).[Results] Soil total carbon

nitrogen and phosphorus concentrations of L. chinense rhizosphere soils in shrubland were higher than those of primary forest; while the patterns of C:N

C:P and N:P ratios were on the contrary. The C:P and N:P ratios of L. chinense rhizosphere soils were significantly different among the lower

middle

and upper slopes at the same vegetation restoration stage. In addition

the rhizosphere soil organic carbon was positively correlated with soil N:P ratio (p<0.05); Both of the soil total nitrogen and phosphorus were positively correlated with soil C:N

C:P

N:P ratios (p<0.05); and the soil C:P ratio was positively correlated with C:N and N:P ratios (p<0.05).[Conclusion] The nutrient providing status of L. chinense rhizosphere soil was mainly limited by soil N in the earlier vegetation restoration stage (shrubland)

while was mainly limited by soil P in latter vegetation restoration stage (primary forest).

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