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《Acta Botanica Boreali-occidentalia Sinica》 2003-01
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The effect of water-fertilizer conditions on crop's niche-fitness and yield in semi-arid regions of the Loess Plateau

LI Zizhen1,2,LI Wenlong1Department of Mathematics,Lanzhou University,Lanzhou 730000,China)  
Introducing the niche theory into the research of crop growth system,this paper discusses the meaning of nichefitness,constructs its mathematical model,and also analyzes the values of crops nichefitness quantitatively under the different habitat conditions.Results show that the optimum niche values tend to increase following the increase of soilwater 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 crops nichefitness 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.
【Fund】: 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
【CateGory Index】: S181
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