Effects of Shrub Encroachment on Potential Vegetation Interception and Soil Water-Holding Capacity of Grasslands on Loess Plateau

Qiao Wenying; An Qiqi; Chang Xiaofeng; Zheng Jiyong; Li Weijun

doi:10.13961/j.cnki.stbctb.2022.01.010

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Effects of Shrub Encroachment on Potential Vegetation Interception and Soil Water-Holding Capacity of Grasslands on Loess Plateau

- Effects of Shrub Encroachment on Potential Vegetation Interception and Soil Water-Holding Capacity of Grasslands on Loess Plateau
- Bulletin of Soiland Water Conservation Vol. 42, Issue 1, Pages: 69-76(2022)
- 作者机构：
  
  1. 西北农林科技大学水土保持研究所, 陕西杨陵,712100
  2. 西北农林科技大学林学院, 陕西杨陵,712100
  3. 宁夏云雾山国家级自然保护区管理局,宁夏,固原,756000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.01.010
  CLC： S714.7
- Published：2022
- 稿件说明：
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Qiao Wenying, An Qiqi, Chang Xiaofeng, et al. Effects of Shrub Encroachment on Potential Vegetation Interception and Soil Water-Holding Capacity of Grasslands on Loess Plateau[J]. Bulletin of Soiland Water Conservation, 2022, 42(1): 69-76.
DOI：

Qiao Wenying, An Qiqi, Chang Xiaofeng, et al. Effects of Shrub Encroachment on Potential Vegetation Interception and Soil Water-Holding Capacity of Grasslands on Loess Plateau[J]. Bulletin of Soiland Water Conservation, 2022, 42(1): 69-76. DOI： 10.13961/j.cnki.stbctb.2022.01.010.

摘要

[目的] 分析灌丛化后草地生态系统植被截留和土壤蓄水特征，为系统评价灌丛化后草地生态系统的水土保持能力提供参考。[方法] 以黄土高原未灌丛化草地和灌丛化草地(包括禾草斑块、半灌木斑块、灌木斑块)为研究对象，系统研究了植被(包括冠层与枯落物)截留量与土壤饱和蓄水量的变化特征。[结果] ①灌丛化通过增加草地地上生物量使植被冠层截留量增加了0.3 mm，通过减少枯落物量使枯落物截留量减少了0.5 mm；②草地灌丛化过程中，只有灌木斑块显著增加了0—40 cm土壤饱和蓄水量。而且，灌木斑块与半灌木斑块土壤饱和蓄水能力显著不同，灌木斑块较半灌木斑块土壤饱和蓄水量增加12.8 mm，主要发生在0—20 cm土层。[结论] 灌丛化没有降低草地生态系统土壤饱和蓄水能力，但若灌木继续扩张，可能会削弱草地生态系统植被截留能力。

Abstract

[Objective] Vegetation interception and soil water-holding capacity were analyzed in order to provied a scientific basis for systematically evaluating the soil and water conservation functions of semi-arid shrub-encroached grasslands. [Methods] Characteristics of vegetation interception (including canopy and litter layer)

soil water-holding capacity of the primary grassland and shrub-encroached grassland (including grass patch

sub-shrub patch

and shrub patch) were measured on the Loess Plateau. [Results] ① The capacity of canopy interception in shrub patches was increased by 0.3 mm with the increasing of aboveground biomass

while the capacity of litter interception was decreased by 0.5 mm through reduction in the litter biomass. ② During shrub encroachment

only shrub patches significantly improved soil water-holding capacity. Moreover

there were significant differences in soil water-holding capacity between sub-shrub and shrub patches. Compared with sub-shrub patches

the capacity of shrub patches was enhanced by 12.8 mm

and the increase mainly occurred in the surface soil (0—20 cm). [Conclusion] Shrub encroachment did not reduce the potential soil water-holding capacity. However

if shrubs continue to expand in area coverage

the interception ability of grassland ecosystem by canopy and litter layer might be weaken.

关键词

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references

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