摘要
目的通过对海河低平原贫水区的杨农复合种植模式土壤水分消耗规律及生产力进行研究,从水分角度为该模式在该地的可持续性提供论据。方法用中子仪测定土壤水分,对作物及杨树进行产量测定。结果(1)5年林龄杨农复合种植模式耗水量高于常规冬小麦-夏玉米的种植模式达24%;0～4m土壤贮水总量年平均下降32.1mm,相当于总贮水量的3.3%;2～4m土壤层次因无水分回补出现持续下降趋势;(2)土壤水亏缺及杨树遮荫等其它原因造成复合系统农作物减产趋于严重,其中林龄3年的杨农复合系统的小麦玉米产量减产平均达到35%。结论海河低平原区大面积推广的杨农复合种植模式威胁着水资源安全和粮食安全。
[Objective] An experiment was carried out to study the rule of soil water consumption in poplar agroforestry system in water-lacking plain area in order to provide the arguments for the sustainability of poplar agroforestry from the viewpoint of water. [Method] Soil water content was measured by neutron machine and production of crops and poplar was measured. [Result] Results indicated that in 2-5 years tree system： （1） the water consumption of poplar ageoforestry system is higher than the mode of sole wheat-corn by 24%; The pondage decreased by 32.1 mm in 0-4 m depth, which equaled 3.3% of the total pondage; It trended that soil from 2 to 4 m depth was becoming dry because no water supplement. （2） The production of crops in agroforestry decreased seriously because of lacking of soil water and illumination and so on, production of wheat and corn in 3 years agroforestry system decreased by 35%. [ Conclusion ] Poplar agroforestry system popularized in Haihe low plain threatens the security of water and food production.
出处
《中国农业科学》
CAS
CSCD
北大核心
2006年第4期758-763,共6页
Scientia Agricultura Sinica
基金
河北省"十五"攻关项目(03220169D)
国家"863"计划项目(002AA2Z4021-1)
国家自然科学基金项目(30471010)资助
关键词
杨农复合系统
土壤水分含量
水分消耗
生产力
Poplar-agroforestry system
Soil water content
Water consume
Productivity
