摘要
海河低平原存在着严重的水资源危机,对该区大面积推广的杨树||(小麦-玉米)复合种植模式进行土壤水分消耗规律的研究十分必要。定位实验研究表明:杨树||(小麦-玉米)复合种植模式耗水量高于常规冬小麦-夏玉米的种植模式7.9%(2年林龄)～24.5%(5年林龄);0～4m土壤贮水总量每年平均下降51.1mm,相当于总贮水量的4.1%;耕层杨树根系与小麦的土壤水分竞争加剧;深层土壤水分消耗加快,2～4m土壤层次因无水分回补出现干燥化趋势;土壤水亏缺及光照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%。对经济、生态效益的综合分析表明该模式在低平原贫水区的持续性发展不容乐观。
Agroforestry is popular in HaiHe low plain where water resource is very lack,So it＇s necessary to research soil-water consuming regular in poplarⅡ（wheat-corn）.The results indicated that water-consumption in poplarⅡ（wheat-corn）is 7.9%（2 year）～24.5%（5 year）higher than that of sole wheat—corn.The pondage decreased 51.1mm in 0～4 meters deep soil,which equaled 4.1% of the total pondage;growth of roots of poplar increased total root in surface soil observably,which caused soil water competition,velocity of soil-water consumption was increased.The soil layer from 2 to 4 meters deep was becoming dry because the soil water was consumed and no water was supplied.The production of crops in agroforestry was decreased seriously because of lacking of soil water and illumination and so on,production of wheat and corn in 3 years agroforestry system decreased 35%.The pattern of agroforestry will be unsustainable if the optimizing compound pattern was not found in this region.
出处
《中国农学通报》
CSCD
2007年第10期66-71,共6页
Chinese Agricultural Science Bulletin
基金
河北省"十一五"攻关项目"黑龙港低平原区农林复合生产技术研究与示范"(06220115D)
国家"十一五"科技支撑计划课题"粮食主产区农田生态健康管理关键技术研究与示范"(2006BAD02A15)
