摘要
在宁南旱区通过研究秸秆还田对土壤水分及作物生产力的影响,为该区土壤扩蓄增容及作物水分利用效率的提高提供理论依据。在3年秸秆还田定位试验中,设置了不同秸秆还田量处理(谷子秸秆按3000、6000、9000kg·hm-2粉碎还田;玉米秸秆按4500、9000、13500kg·hm-2粉碎还田,对照为秸秆不还田),对不同处理条件下的土壤含水量、作物水分利用效率和作物产量等指标进行了分析。结果表明,随秸秆还田量由高到低,在试验第3年(2009年)玉米播种期0～200cm土层的土壤贮水量分别较CK提高8.8%、9.9%和6.8%;成熟期0～200cm土层的土壤贮水量分别较CK提高14.8%、13.9%和12.8%;产量分别较CK显著提高30.7%、29.2%和12.5%(P<0.05);作物水分利用效率分别较CK显著提高41.1%、35.9%和21.3%(P<0.01)。在宁南半干旱区采用秸秆还田能较好地保蓄土壤水分,利于土壤水库的扩蓄增容,且对提高作物产量和作物水分利用效率有显著效果。
Research on effects of straw returning treatments on soil water and crop productivity was conducted in the semi-arid areas of Southern Ningxia for providing a theoretical basis of expanding soil water storage capacity and improving crop water use efficiency.The different straw returning treatments were 3 000,6 000,9 000 kg·hm-2 of millet straw and 4 500,9 000,13 500 kg·hm-2 of corn straw,the CK had no straw returning.The results of three years field experiment showed that in the third experiment year（2009）,follow the amount of straw returning from high to low,compared with CK,soil water storages（depth 0～200 cm） increased 8.8%,9.9% and 6.8% respectively at the sowing stage of corn;Soil water storages（depth 0～200 cm） increased 14.8%,13.9% and 12.8% respectively at the maturity stage of corn;Grain yield of corn increased 30.7%,29.2% and 12.5%（P0.05） respectively;The water use efficiency increased 41.1%,35.9% and 21.3%（P0.01）respectively.In the semi-arid areas of Southern Ningxia,the use of straw returning technology could play an active role in the preservation of soil moisture,expand soil water storage capacity,and increase crop yield and crop water use efficiency significantly.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2011年第1期93-99,共7页
Journal of Agro-Environment Science
基金
"十一五"国家科技支撑课题"农田集雨保水关键技术研究"(2006BAD29B03)
"节水共性技术研究"(2007BAD88B10)
关键词
秸秆还田
宁南旱区
土壤水分
作物生产力
straw returning
semi-arid areas of Southern Ningxia Province
soil water
crop productivity
