东平湖湖滨带农田土壤碳通量的动态变化  

Dynamic Changes of Soil Carbon Flux in Corpland of Dongping Lakeside Zone

作　　者：路亚坤[1] 刘加珍[1] 陈永金[1] 陈诗越[1] 

机构地区：[1]聊城大学环境与规划学院,山东聊城252059

出　　处：《贵州农业科学》2013年第5期104-108,共5页Guizhou Agricultural Sciences

基　　金：国家自然科学基金"东平湖湿地水文化学过程的生态效应研究"(40901276);国家自然科学基金"断流河道间歇性输水条件下地下水质变化及其生态效应研究"(40871239);国家自然科学基金"全新世以来东平湖变迁与黄河洪水关系及动力机制研究"(41072258);山东省优秀中青年科学家科研奖励"东平湖湿地植物功能型及其对人为干扰的响应研究"(2011BSB01256);中国博士后基金项目"塔里木河中游湿地水文过程变化的生态效应"(2012M512058)

摘　　要：为揭示东平湖湖滨带3种不同土地利用土壤碳通量特征及其与各影响因子的关系,利用LI-8100开路式土壤碳通量测量系统,研究了温度和水分对东平湖湖滨带农田土壤碳通量日变化的影响。结果表明:农田土壤碳通量的日变化基本呈单峰曲线;在日时间尺度上,棉田、萝卜田土壤碳通量与温度均无显著相关,而小麦地与温度均表现为显著指数相关;除棉田土壤碳通量与土壤湿度表现为显著二次相关外,小麦地、萝卜田与水分均无显著相关,棉田和小麦地温度和水分对土壤呼吸速率均有影响;由4个因子共同拟合出的模型能解释土壤碳通量62%以上的变化。温度和水分不是造成秋季东平湖农田土壤呼吸差异的主要原因,土壤呼吸差异可能受植被和人为活动的影响较大。The effect of tempreture and moisture on daily soil carbon flux variation of corplands of Dongping lakeside zone was studied by the LI-8100 automated soil CO2 flux system to reveal soil carbon flux characteristics of three different land utilization types and the relationship between different influence factors. The daily soil carbon flux variation of corplands presented a unimodal curve basically. There was no significant correlation between soil carbon flux and tempreture in cotton and turnip field based on the daily time scale, but there was a significant index correlation between soil carbon flux and tempreture in wheat field. There was no significant correlation between soil carbon flue and moisture in wheat and turnip field but there was a significant quadratic correlation between soil carbon flux and soil humidity in cotton field. Tempreture and moisture both had the effect on soil respiration rate of cotton and wheat fields. The model fitted from four factors could explain changes of over 62% soil carbon flux. Tempreture and moisturebwere not the main factor affecting soil respiration difference of different land utilization types and the soil respiration difference may be caused by vegetation and human activities mainly.

关 键 词：农田 土壤碳通量 温度 水分 

分 类 号：S158.2[农业科学—土壤学]