摘要
为探明微灌与播前深松耕作对夏玉米根际土壤酶活性和产量的影响,以大田夏玉米为研究对象,设计微灌灌溉方式（地表滴灌、地下滴灌和微润灌）、灌水量（分别控制土壤含水量下限为田间持水率的50%、65%和80%）和深松深度（20、40、60 cm）3因素、3水平正交田间试验.结果表明：夏玉米全生育期内,土壤过氧化氢酶和脲酶活性均呈先增加后减小趋势,磷酸酶活性则呈先减小后增加趋势.地下滴灌0-80 cm生育期平均土壤含水率比地表滴灌和微润灌高6.3%和1.8%,且显著提高土壤脲酶活性、夏玉米根系体积和产量;随着灌水量的增加,土壤磷酸酶活性呈先减小后增加趋势,脲酶活性和产量均呈先增加后减小趋势,生育期平均土壤含水率与根系体积均呈增加趋势;深松40 cm比20 cm的产量和根系体积增加量大于深松60 cm比40 cm的增加量,深松40 cm土壤酶活性较高.从提高水资源、氮肥利用率及作物产量角度考虑,该地区夏玉米种植的最优组合应为地下滴灌、灌水下限为田间持水率的65%与播前深松40 cm.
In order to explore the influences of micro-irrigation and subsoiling before planting on enzyme activity in soil rhizosphere and summer maize yield,an orthogonal experiment was carried out with three factors of micro-irrigation method,irrigation depth,and subsoiling depth. The factor of irrigation method included surface drip irrigation,subsurface drip irrigation,and moistube-irrigation; three levels of irrigation depth were obtained by controlling the lower limit of soil water content to 50%,65%,and 80% of field holding capacity,respectively; and three depths of deep subsoiling were 20,40,and 60 cm. The results showed that the activities of catalase and urease increased first and then decreased,while the activity of phosphatase followed an opposite trend in the growth season of summer maize. Compared with surface drip irrigation and moistube-irrigation,subsurface drip irrigation increased the average soil moisture of 0-80 cm layer by 6.3% and 1.8% in the growth season,respectively. Subsurface drip irrigation could significantly increase soil urease activity,roots volume,and yield of summer maize. With the increase of irrigation level,soil phosphatase activity decreased first and then increased,while urease activity and yield increased first and then decreased. The average soil moisture and root volume all increased in the growth season of summer maize. The increments of yield and root volume from subsoiling of 40 to 20 cm were greater thanthose from 60 to 40 cm. The highest enzyme activity was obtained with the treatment of subsoiling of40 cm. In terms of improving water resource use efficiency,nitrogen use efficiency,and crop yield,the best management strategy of summer maize was the combination of subsurface drip irrigation,controlling the lower limit of soil water content to 65% of field holding capacity,and 40 cm subsoiling before planting.
出处
《应用生态学报》
CAS
CSCD
北大核心
2016年第6期1925-1934,共10页
Chinese Journal of Applied Ecology
基金
国家高技术研究发展计划项目(2011AA100507)资助~~
关键词
微灌
深松
夏玉米
土壤酶活性
产量
micro-irrigation
subsoiling
summer maize
soil enzyme activity
yield
