不同刈割间隔对羊草草甸草原割草地土壤呼吸的影响

Effect of cutting treatment on soil respiration rate of Leymus chinensis grassland

研究不同刈割方式对呼伦贝尔草甸草原土壤呼吸特性的影响,以及土壤呼吸速率与局域气候因子的关系。结果表明:不同刈割年限土壤含水量总体变化趋势为1年刈割区>2年刈割区>3年刈割区>对照区,其数值分别为10.12%,9.82%,9.60%,8.73%;天然割草地土壤呼吸速率的日最高值出现在12:00～14:00,不同刈割年限草地土壤呼吸速率,总体变化趋势对照区>1年刈割区>2年刈割区>3年刈割区;近地面的相对湿度、CO2浓度、大气温度均对土壤呼吸速率具有明显影响,而大气压对其没有影响。

The effect of cutting treatment on the soil respiration characteristics and the relationship between soil respiration rate and near-surface atmospheric conditions of grassland in Hulunbeir were studied.The results showed that the variation trend of soil water content under different cutting treatments was two cutting yearsone cutting yearthree cutting yearsfour enclosed years,and its value were 10.12%,9.82 %,9.60% and 8.73%,respectively.The maximum value of soil respiration rate occurred between 12：00 to 14：00.For the soil respiration rate under different cutting treatments,it was four enclosed yearstwo cutting yearsone cutting yearthree cutting years.The effect of near surface air relative humanity,CO2 concentration,air temperature on soil respiration rate was significantly positive but not for air pressure.