摘要
【目的】为旱区不同降水年型冬小麦蓄墒增产耕作方式的选择提供科学依据。【方法】于2007—2018年在陕西黄土旱塬实施免耕与深松轮耕长期定位试验,设置免耕/免耕/深松(NNS)、免耕/深松(NS)和连续免耕(N)3种耕作处理,分析不同降水年型轮耕模式下冬小麦休闲期和生育期蓄墒效果及ET、WUE、产量和经济效益。【结果】降水年型对冬小麦休闲期及生育期土壤蓄墒、ET、WUE、产量和经济效益影响显著。丰水年型较干旱和平水年型分别提高冬小麦休闲期(23.9%和31.9%)和生育期(6.5%和16.6%)0—200 cm土层土壤蓄墒量,并在冬小麦水分急剧消耗的拔节期至灌浆期,分别增加耗水量1倍和3倍以上,且较干旱和平水年型WUE分别提高21.1%和16.3%,增产70.0%和25.8%,增效2倍和1/2倍以上。干旱、丰水和平水年型分别以免耕/深松(NS)(106.1 mm)、连续免耕(N)(192.0 mm)和连续免耕(N)(91.5 mm)处理休闲期0—200 cm土壤蓄墒量最高;生育期0—100 cm土壤蓄墒效果受降雨和冬小麦生长发育影响波动较大,但120—200 cm深层土壤蓄水量基本呈'先增后减'的稳定变化趋势,并以免耕和深松轮耕措施蓄墒效果较好;免耕/免耕/深松(NNS)处理在干旱和丰水年型WUE及增产增效优势显著,在平水年型,连续免耕(N)处理产量和经济效益最高,分别为4 297 kg·hm-2和4 773元/hm2。受深松作业及其频次影响,免耕/免耕/深松(NNS)和免耕/深松(NS)轮耕处理分别增加生产成本172和227元/hm2,但生产投入的高低并非是影响经济效益的关键因素。较免耕/深松(NS)处理,免耕/免耕/深松(NNS)能以较少的深松频次节省生产成本,以较高的籽粒产量实现经济效益的最大化,具有减耗节水、提高冬小麦WUE和节本增效的优势,并在多数试验年份下保持节水减耗、经济高效的生产正效应,更具生产普适性。【结论】从可持续农业生产及绿色低耗高效的发展目标综合分�
【Objective】The aims of this study were to provide scientific basis for the selection of tillage method of soil moisture accumulation and yield increase in different precipitation types of winter wheat in the arid region of China.【Method】Long-term no-tillage and subsoiling rotational tillage experiments were carried out in the Loess Plateau dryland,Shaanxi province from 2007 to 2018.Three tillage treatments,including no-tillage/no-tillage/subsoiling(NNS),no-tillage/subsoiling(NS)and continuous no-tillage(N),were set up to compare and analyze the effects of different precipitation patterns and tillage treatments on soil water storage,ET,WUE,yield and economic profits of winter wheat during its summer-fallow and growth period.【Result】Different precipitation patterns had significant impact on soil water storage,ET,WUE,yield and economic profits during the fallow and growth period of winter wheat.Compared with dry and normal year,the soil water storage of 0-200 cm soil layer in fallow period(23.9%and 31.9%)and growth period(6.5%and 16.6%)of winter wheat could be increased in humid precipitation pattern,and the water consumption in elongation and grain-filling period of winter wheat with rapid water consumption increased by more than 1 and 3 times,respectively;Whilst,the WUE increased by 21.1%and 16.3%,yield increased by 70.0%and 25.8%,and economic profits increased by more than 2 and 1/2 times,respectively.The soil water storage of 0-200 cm in fallow period was better treated by dry,humid and normal year under no-tillage/subsoiling(NS)(106.1 mm),continuous no-tillage(N)(192.0 mm)and continuous no-tillage(N)(91.5 mm),respectively.The soil water accumulation of 0-100 cm in the growth period fluctuates greatly under the influence of precipitation and the growth of winter wheat.However,the soil water storage in 120-200 cm soil depth showed a stable change trend of'first increase,then decrease',and the water storage effect of no-tillage and subsoiling rotational system was better.No-tillage/no-tillage/subsoilin
作者
于琦
李军
周栋
王淑兰
王浩
李敖
张元红
宁芳
王小利
王瑞
YU Qi;LI Jun;ZHOU Dong;WANG ShuLan;WANG Hao;LI Ao;ZHANG YuanHong;NING Fang;WANG XiaoLi;WANG Rui(College of Agronomy,Northwest A&F University,Yangling 712100,Shaanxi)
出处
《中国农业科学》
CAS
CSCD
北大核心
2019年第11期1870-1882,共13页
Scientia Agricultura Sinica
基金
国家科技支撑计划(2015BAD22B02)
国家自然科学基金(31571620,31671641)
国家公益性行业(农业)科研专项(201503116)
关键词
黄土旱塬
冬小麦
免耕与深松轮耕
蓄水保墒
产量
经济效益
Loess Plateau
winter wheat
no-tillage and subsoiling rotational system
soil water storage conservation
yield
economic profit
