栽培模式对夏玉米田土壤呼吸速率的影响

摘要

A field experiment was conducted to study the effects of two cultivation patterns(ridge culture and conventional tillage) on soil respiration rate of summer maize,so as to explore the soil respiration status of summer maize under different cultivation pattern.Results:1) Diurnal variation of soil respiration rate reached the highest at 14:00,the soil respiration rate was ordered as ridge surface＞ conventional tillage＞ridge furrow,with the growth and development proceeding,the soil respiration rate of ridge cultivation and conventional cultivation all increased first and then decreased,and reached the maximum in silking period.2) During the growth period of summer maize,the soil respiration rate of ridge surface,ridge furrow and conventional tillage was 4.42 mol/(m2 · s),2.61 μmol/(m2 · s) and 3.56 μmol/(m2 · s) respectively.3) After irrigation the soil respiration rate of ridge cultivation and conventional tillage all decreased,but ridge surface recovered rapidly.%为了探明不同栽培模式下夏玉米田的土壤呼吸状况,采取田间试验研究了垄作和平作两种栽培模式对夏玉米农田土壤呼吸速率的影响.结果表明:1)栽培夏玉米的土壤呼吸速率日变化在14:00最大,各生育期的土壤呼吸速率均为垄作垄面＞平作＞垄作垄沟,并随着生育进程的推进,垄作和平作的土壤呼吸速率均表现为先升高后降低的趋势,且在吐丝期达到最大.2)在夏玉米生育期内,垄作垄面、垄作的垄沟和平作地面的土壤呼吸速率分别为4.42 μmol/(m2·s)、2.61 μmol/(m2·s)和3.56 μmol/(m2·s).3)灌水后垄作和平作的土壤呼吸速率均下降,但垄面的土壤呼吸速率恢复较快.