黄土区梯田不同覆膜条件下土壤的呼吸特征  

Soil Respiration Characteristics Under Different Film Mulching Conditions in Terraced Land in Loess Area

作　　者：陈爱华 马涛 董彦丽 李泽霞 吕文强 Chen Aihua;Ma Tao;Dong Yanli;Li Zexia;Lü Wenqiang(Institute of Soil and Water Conservation of Gansu Province, Lanzhou, Gansu 730020, China)

机构地区：[1]甘肃省水土保持科学研究所,甘肃兰州730020

出　　处：《水土保持通报》2021年第2期194-200,共7页Bulletin of Soil and Water Conservation

基　　金：甘肃省水利重点科研计划项目“黄土区梯田不同覆膜情况下碳循环研究”(甘水科外[2018]70号)。

摘　　要：[目的]研究黄土区梯田不同覆膜条件下的土壤呼吸特征,为探寻土壤碳循环的合理农业覆膜措施提供科学依据。[方法]设置裸地、白膜地和黑膜地3个处理进行试验。[结果]①不同覆膜方式玉米地的土壤呼吸速率日变化都呈单峰曲线变化趋势,日均值表现为:黑膜地>白膜地>裸地,且不同覆膜条件的土壤呼吸速率差异显著。②白膜地和黑膜地不同月份土壤呼吸速率变化表现为:7月>5月>3月>9月>11月,裸地不同月份土壤呼吸速率变化表现为:7月>3月>9月>5月>11月,夏季土壤呼吸活动最剧烈,且不同覆膜条件不同月份土壤呼吸速率两两之间差异显著。③不同覆膜条件的土壤CO 2年排放量表现为:黑膜地>白膜地>裸地,且夏季和秋季的土壤CO 2年排放量均高于春季和冬季。④不同覆膜条件玉米地土壤呼吸速率与地表温度、5 cm土壤温度具有很好的相关性,且都表现出极显著相关,覆膜玉米地5 cm土壤温度对土壤呼吸速率的影响高于地表温度,裸地则反之,白膜玉米地土壤呼吸速率对温度的敏感性高于其他覆膜情况。[结论]不同覆膜条件下,土壤含水率自表层至深层呈现S形变化规律,裸地在0—60 cm土层的含水率明显低于两种覆膜地。梯田在不同覆膜条件下土壤呼吸速率和土壤呼吸CO 2释放量均增大,可有效改善黄土区梯田土壤碳循环环境。[Objective]The soil respiration characteristics in terraced fields under different film mulching conditions in the loess area were studied,in order to provide scientific basis for exploring reasonable agricultural plastic film mulching measures of soil carbon cycle.[Methods]The study set up three treatments for experiments:bare land,white film land and black film land.[Results]①The daily variation of soil respiration rate of corn fields with different film mulching conditions showed a single-peak curve trend,and the daily average value was as follows:black film land>white film land>bare land,and the soil respiration rate of different mulching treatments was significantly different.②The change of soil respiration rate of the white film land and the black film land in different months was as follows:July>May>March>September>November.The change of soil respiration rate of the bare land in different months was as follows:July>March>September>May>November.The soil respiration activity in summer was very intense,and the soil respiration rate in different months of different film mulching conditions was significantly different.③The annual soil CO_(2) emissions from the soil of different mulching films were as follows:black film land>white film land>bare land,and the annual CO_(2) emissions from soil in summer and autumn were higher than those in spring and winter.④The soil respiration rate of different film-mulched corn fields had a good correlation with the surface temperature and 5 cm soil temperature,and both showed extremely significant correlations.The 5 cm soil temperature of the film-mulched corn field had a higher impact on the soil respiration rate than the surface temperature,and vice versa in bare land.[Conclusion]Under different mulching conditions,the soil moisture content from the surface to the deep layer changes in an S-shaped curve.The soil moisture in 0—60 cm soil layer was significantly lower in bare land than in the other two film-mulched land.Soil respiration rate and CO_(2) release of soi

关 键 词：土壤呼吸速率 地膜覆盖 梯田 黄土区 

分 类 号：S158.5[农业科学—土壤学]