Responses of Soil Respiration Rates of Four Plant Communities to Grazing Prohibition in Deserted Grassland

CHEN Lin; LI Xue-bin; XU Kun; WANG Lei

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Responses of Soil Respiration Rates of Four Plant Communities to Grazing Prohibition in Deserted Grassland

- Responses of Soil Respiration Rates of Four Plant Communities to Grazing Prohibition in Deserted Grassland
- Bulletin of Soiland Water Conservation Vol. 31, Issue 5, Pages: 156-160(2012)
- 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, 西北土地退化与生态恢复省部共建国家重点实验室培育基地, 西部生态与生物资源开发联合研究中心,宁夏,银川,750021
- 作者简介：
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- Published：2012
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CHEN Lin, LI Xue-bin, XU Kun, et al. Responses of Soil Respiration Rates of Four Plant Communities to Grazing Prohibition in Deserted Grassland[J]. Bulletin of Soiland Water Conservation, 2012, 31(5): 156-160.
DOI：

CHEN Lin, LI Xue-bin, XU Kun, et al. Responses of Soil Respiration Rates of Four Plant Communities to Grazing Prohibition in Deserted Grassland[J]. Bulletin of Soiland Water Conservation, 2012, 31(5): 156-160. DOI：

摘要

采用动态密闭气室分析法

分别研究了放牧与围封条件下赖草群落、沙蒿群落、甘草群落、冰草群落4种典型荒漠草原植物群落土壤呼吸及其与温度因子的关系

揭示了4种典型荒漠草原植物群落土壤呼吸对封育禁牧的响应过程。结果表明

放牧与围封样地的土壤呼吸速率日动态均呈现出不对称的单峰型曲线

高峰值一般出现在14:00-16:00。围封样地土壤呼吸速率值大于放牧样地

但各监测时刻差异显著性不尽相同。放牧与围封样地各植物群落中较深层土温(10

15cm)和土壤呼吸速率的相关性普遍高于浅层土温(5cm)、深层土温(20cm)和气温

其中15cm土层温度与土壤呼吸速率相关性最高。除沙蒿群落外

其他3种植物群落放牧样地Q

值均显著低于围封样地

值大小依次均为:沙蒿群落>赖草群落>甘草群落>冰草群落

其中沙蒿群落Q

值远高于其他3个群落。

Abstract

Dynamic closed chamber IRGA method is used to study the relationship between soil respiration and temperature of four deserted grassland communities

i.e.

Artemisia desertorum

Leymus secalinus

Glycyrrhiza uralensis and Agropyron crisatum

in grazing and enclosed plots

and reveal their effects on soil respiration in enclosed plots.The main results are as follows:The diurnal patterns of soil respiration rate in grazing and enclosed plots manifest a single-peak asymmetric curve

and the maximum soil respiration rate occurs at 14:00-16:00. Soil respiration rates in enclosed plots are higher than those in grazing plots

but the significant differences are distinct in the communities of the grazing and the enclosed plots at certain time. The correlation between soil temperature and soil respiration rates at 10 and 15cm depths are higher than that at 5and 20cm depths.At 15cm depth

air temperature is well correlated with soil respiration rate. Be-sides the Artemisia desertorumcommunity

the Q10 values of other plant communities in grazing plots are re-markably lower than those in enclosed plots. The Q10 values are in the order of Artemisia desertorum>Ley-mus secalinus>Glycyrrhiza uralensis> Agropyron crisatum.The Q10 value of Artemisia desertorumcom-munity is greatly above other communities.

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