Effect of Grazing Disturbance on Soil Microbial Biomass and Respiratory Quotient in Mountain Forest of Arid Valley Ecotone in Upper Reaches of Minjiang River

LIU Shan-shan; WANG Fen; ZHANG Xing-hua; GONG Yuan-bo; WANG Yan; YIN Yan-jie; LI Yuan; MA Jin-song; GUO Ting

doi:10.13961/j.cnki.stbctb.2014.02.014

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Effect of Grazing Disturbance on Soil Microbial Biomass and Respiratory Quotient in Mountain Forest of Arid Valley Ecotone in Upper Reaches of Minjiang River

- Effect of Grazing Disturbance on Soil Microbial Biomass and Respiratory Quotient in Mountain Forest of Arid Valley Ecotone in Upper Reaches of Minjiang River
- Bulletin of Soiland Water Conservation Vol. 33, Issue 2, Pages: 63-68(2014)
- 作者机构：
  
  四川农业大学长江上游林业生态工程四川省重点实验室,四川,雅安,625014
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.02.014
  CLC：
- Published：2014
- 稿件说明：
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LIU Shan-shan, WANG Fen, ZHANG Xing-hua, et al. Effect of Grazing Disturbance on Soil Microbial Biomass and Respiratory Quotient in Mountain Forest of Arid Valley Ecotone in Upper Reaches of Minjiang River[J]. Bulletin of Soiland Water Conservation, 2014, 33(2): 63-68.
DOI：

LIU Shan-shan, WANG Fen, ZHANG Xing-hua, et al. Effect of Grazing Disturbance on Soil Microbial Biomass and Respiratory Quotient in Mountain Forest of Arid Valley Ecotone in Upper Reaches of Minjiang River[J]. Bulletin of Soiland Water Conservation, 2014, 33(2): 63-68. DOI： 10.13961/j.cnki.stbctb.2014.02.014.

摘要

选择岷江上游理县山地森林/干旱河谷交错带地区人工刺槐林、人工杨柳林、草地和锥花小檗灌丛这4种植被类型为研究对象

对4种植被下的土壤微生物量及呼吸熵对放牧干扰的响应进行了研究。以距牧道距离远近的不同设置了3种放牧干扰强度处理

分别对各植被类型3种放牧干扰强度的土壤进行了分析。结果表明

在各植被类型下

土壤有机碳(SOC)和土壤微生物量碳(MBC)含量随放牧干扰强度的增加而降低。各植被类型下表层土壤呼吸熵值(q

)值随放牧压力的增加而增大(除灌丛中度干扰外)

增加幅度为15.14%~100.54%

说明放牧干扰使微生物体的周转率加快

对SOC的利用率降低

释放的CO

增多

土壤碳保存率降低。

Abstract

This study focused on the responses of microbial biomass and respiratory quotient of 4 vegetation types to grazing disturbance at the upper reaches of Minjiang River. These vegetations were Robinia pseudoacacia

Artificial Poplar

Grassland and Berberis shrub. Three grazing disturbance intensity were set with different distances from sample plots to grazing-path. Then analyzed soils under different treatments. The results showed that at different vegetation types

the values of soil organic carbon(SOC) and microbial biomass corbon(MBC) decreased with the increasing grazing intensity; the values of qCO2 of surface soil increased by 15.14%~100.54% with the increase of grazing pressure(except moderate disturbance in shrubs). These data illustrated that grazing disturbance accelerated the turnover rate of microorganisms

decreased the utilization rate of SOC

increased emission content of CO2 and decreased preserving rate of soil carbon.

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