摘要
将生态位理论引进作物生长系统研究中,探讨了作物生态位适宜度的内涵,建立了其数学模型;并依据大田水肥控制实验,对作物生态位适宜度值进行了定量分析。结果表明:在水分梯度上随着土壤水分含量的增加,作物生态位适宜度值呈上升趋势;适量施肥和播种后地膜覆盖均有增加叶面积指数,提高适宜度值和增加产量的效果。其中平水条件下施低肥、中肥和高肥,比不施肥样区的叶面积指数最大值分别增加了43.5%、80.7%和88.8%;适宜度值分别提高了6.4%、17.9%和23.0%;籽粒产量分别增加了25.0%、69.9%和90.9%。地膜覆盖30d和50d,作物适宜度值上升了13.9%和17.7%,作物产量增加了55.3%和70.3%。作物产量与其适宜度值之间呈现显著的线性相关关系。
Introducing the niche theory into the research of crop growth system,this paper discusses the meaning of nichefitness,constructs its mathematical model,and also analyzes the values of crops nichefitness quantitatively under the different habitat conditions.Results show that the optimum niche values tend to increase following the increase of soilwater contents on the water gradient.Both moderate fertilizing and plastic film covering after sowing have the effect of increasing fitness and yields.The values of leaf area index are increased by 43.5%,80.7% and 88.8% respectively,and their fitness by 6.4%,17.9% and 23% respectively,and their yields by 25%,69.9% and 90.9% after trifle,moderate and glut fertilizing under moderate water condition.After 20 d and 40 d plastic film covering,the values of crops nichefitness degree are increased by 13.9% and 17.7% respectively,and their yields by 55.3% and 70.3% respectively.The grain yield of the Spring wheat is remarkable linear interrelated with the fitness values.
出处
《西北植物学报》
CAS
CSCD
2003年第1期28-33,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家重点基础研究发展规划项目(G2000018603)
国家自然科学基金(39970135
30070139)资助
