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黄土台塬不同土地利用方式下土壤呼吸季节性变化及影响因素

刘丽雯 刘梦云 吴健利 赵国庆 刘欢 张杰 张萌萌

刘丽雯, 刘梦云, 吴健利, 赵国庆, 刘欢, 张杰, 张萌萌. 黄土台塬不同土地利用方式下土壤呼吸季节性变化及影响因素[J]. 环境科学研究, 2016, 29(12): 1819-1828.
引用本文: 刘丽雯, 刘梦云, 吴健利, 赵国庆, 刘欢, 张杰, 张萌萌. 黄土台塬不同土地利用方式下土壤呼吸季节性变化及影响因素[J]. 环境科学研究, 2016, 29(12): 1819-1828.
LIU Liwen, LIU Mengyun, WU Jianli, ZHAO Guoqing, LIU Huan, ZHANG Jie, ZHANG Mengmeng. Seasonal Variation of Soil Respiration and Affecting Factors under Different Land Use Types in the Tablelands of the Loess Plateau[J]. Research of Environmental Sciences, 2016, 29(12): 1819-1828.
Citation: LIU Liwen, LIU Mengyun, WU Jianli, ZHAO Guoqing, LIU Huan, ZHANG Jie, ZHANG Mengmeng. Seasonal Variation of Soil Respiration and Affecting Factors under Different Land Use Types in the Tablelands of the Loess Plateau[J]. Research of Environmental Sciences, 2016, 29(12): 1819-1828.

黄土台塬不同土地利用方式下土壤呼吸季节性变化及影响因素

基金项目: 中国科学院重点部署项目(KFZD-SW-306);农业部农业环境重点实验室开放基金项目

Seasonal Variation of Soil Respiration and Affecting Factors under Different Land Use Types in the Tablelands of the Loess Plateau

  • 摘要: 为探讨土壤呼吸对植被类型及不同季节环境因素的响应机制,以黄土高原渭北台塬马莲滩林场为研究区,于2015年5月—2016年4月,采用静态箱-气象色谱法逐月测定不同土地利用方式下的土壤呼吸速率(Rs),分析其干、湿季差异及与土壤温度(T)、土壤含水量(W)之间的关系.结果表明:①不同土地利用方式下土壤呼吸速率的季节性变化趋势相一致,最大值出现在6—8月,最小值出现在12月—翌年2月,土壤呼吸速率年均值表现为天然草地>灌木林地>乔木林地>乔灌混交林地>耕地>果园.②不同土地利用方式下土壤呼吸速率与土壤温度均呈正相关,与土壤含水量的关系在湿季(5—10月)呈正相关,在干季(11月—翌年4月)呈负相关,土壤呼吸速率的单因素模型中以指数函数(Rs=aebx)的拟合效果更优.③与单因素模型相比,土壤温度、土壤含水量的双因素模型(Rs=aTbWc和Rs=aebTWc)能更好地解释除耕地外的其他5种土地利用方式下土壤呼吸速率的变化特征,对土壤呼吸速率的解释率在60.0%~82.3%之间,其中Rs=aTbWc对耕地、灌木林地、果园土壤呼吸速率与土壤温度、土壤含水量间关系的拟合效果较好,天然草地、乔木林地、乔灌混交林地则采用Rs=aebTWc的拟合效果较好.研究显示,研究区不同土地利用方式下土壤呼吸速率存在明显的季节性差异,耕地退耕还林后土壤有机碳及活性有机碳含量增加,温度敏感性(Q10)降低,土壤呼吸速率增大,评价退耕还林效益时应综合考虑区域地理气候特点,进一步量化碳的输入/输出过程.

     

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  • 收稿日期:  2016-07-01
  • 修回日期:  2016-09-26
  • 刊出日期:  2016-12-25

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