GAO Jinfang,ZHOU Bo,MA Tao,et al.Soil Respiration Characteristics Under Different Land Use Patterns in Semi-arid Area[J].Research of Soil and Water Conservation,2017,24(02):89-93.
半干旱区不同土地利用方式下土壤呼吸特征
- Title:
- Soil Respiration Characteristics Under Different Land Use Patterns in Semi-arid Area
- Keywords:
- land use patterns; soil respiration; saline land; semi-arid area
- 分类号:
- S714.5
- 摘要:
- 采用动态密闭气室红外CO2分析法测定了盐碱地、撂荒地和苜蓿地三种土地利用方式下的土壤呼吸速率，并结合水热因子，对不同土地利用方式下土壤呼吸速率的差异性以及其和温度、含水量之间的关系进行了分析。结果表明：三种土地利用类型土壤呼吸速率日变化均呈现单峰型曲线，与气温变化趋势一致，一天中气温最高时的土壤呼吸速率均显著高于其他时间；不同土地利用方式土壤呼吸与水热因子均呈正相关，采用线性关系式来分析土壤呼吸速率与土壤水分含量的关系。不同土地利用方式下土壤呼吸速率与近地面气温、不同深度土壤温度的关系可以用指数方程得到较好的拟合（p < 0.05），撂荒地土壤呼吸的温度敏感性系数Q10值变化较大，从而对土壤温度的响应更为敏感，且不同深度土壤的Q10值存在较大差异，盐碱地和苜蓿地不同土层的Q10值均在2.0左右变化，与全球Q10的平均水平接近。盐碱地、撂荒地和苜蓿地土壤呼吸与土壤温度和湿度的双变量模型关系显著，比相应的单变量模型更好地解释了土壤呼吸变异。
- Abstract:
- Soil respiration rates under the saline land, abandoned land and Medicago sativa land were measured by the closed-IRGA infrared CO2 method, the differences in soil respiration in different land use patterns and the relationships between soil respiration, soil temperature and soil moisture were analyzed. The results showed that diurnal changes of soil respiration presented single peak curves and the changes of air temperature followed a similar trend, the soil respiration reached the maximum values when the soil temperature was close to the maxsimum; there were positive correlations between soil respiration and soil moisture, soil temperature under different land use patterns, the relationship between soil respiration and soil moisture content was linear. The exponential equation could present the relationship between soil respiration and near-surface air temperature, soil temperature at different depths better(p < 0.05), the significant variation of the Q10 of soil respiration of abandoned land was observed, illustrating that the soil respiration was more sensitive to soil temperature, the values of Q10 were significantly different in different soil depths; the values of Q10 in saline land and Medicago sativa land at different soil depths were around 2.0, which was closed to the global average value. A two-variable soil respiration model (soil temperature and soil moisture) could explain the variations of soil respiration much better than mono-variable model under saline land, abandoned land and Medicago sativa land.
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备注/Memo
收稿日期:2016-05-06;改回日期:2016-08-02。
基金项目:甘肃省水利重点科研计划项目（2013-293）；水利部“948”项目（201522）；甘肃省自然科学资助项目（1506RJZA176）；甘肃省青年科技资助项目（1506RJYA177）；甘肃省水利重点科研计划项目（2014-223-6）
作者简介:高金芳(1982-),女,甘肃靖远县人,硕士,工程师,主要从事水土保持研究。E-mail:317660806@qq.com