英语翻译1.明确垂榆（Ulmus pumilavar pendula）叶片养分与土壤理化性质的变化规律,掌握树木营养与土

英语翻译
1.明确垂榆（Ulmus pumilavar pendula）叶片养分与土壤理化性质的变化规律,掌握树木营养与土壤养分的关系.得出土壤物理性质对植株生物量的影响大部分未达到显著水平.土壤营养水平速K,全N对垂榆生物量影响最大.
2.通过分析比较垂榆不同样地的高产组叶片矿质养分状况,得出植株叶片矿质养分与生态条件、栽培技术因子之间是相互影响的.在建立树种叶片营养诊断指标时,应充分考虑到采样地点对叶片营养元素含量的影响,在一定地区范围内,必须采用多点,多株的采样分析,才能反应出该品种营养状况.在此基础上提出的该品种叶片标准值范围,并应用于指导合理施肥.
3.提出了垂榆营养诊断的重要参数：垂榆的N/P、K/P和K/N.通过分析高产组垂榆叶片矿质养分状况,分别确定了秋季营养转化时期树种矿质养分含量的平衡参比值.DRIS诊断结果表明：垂榆叶片的最佳比为N/P=10.94、K/P=0.55、N/K=6.
4.确定了秋季营养转化时期,垂榆矿质养分含量的营养充足阈值：PLI诊断结果为:垂榆营养阈值为5.75.此诊断结果可以为施肥提供理论依据,旨在提高肥料配比和施用的合理性和有效性.

1.Hangs the siberian elm explicitly (Ulmus pumilavar pendula) the leaf blade nutrient and the soil physics and chemistry nature change rule,the grasping trees nutrition and the soil nutrient relations.Obtains the soil physical property confrontation adult plant biomass the influence majority of not to achieve the remarkable level.Soil nutritional level fast K,entire N to hangs the siberian elm biomass influence to be biggest.2.Hangs the siberian elm not same place through the analysis comparison the high production group leaf blade mineral substance nutrient condition,obtains the adult plant leaf blade mineral substance nutrient and the ecological condition,between the cultural technique factor is affects mutually.When establishment tree seed leaf blade nutrition diagnosis target,should consider fully the sampling place to the leaf blade nutritive elements content influence,in certain local scope,must use the multi-spots,many sampling analysis,can respond this variety nutrition condition.This variety leaf blade normal value scope proposed which in this foundation,and using applies fertilizer rationally in the instruction.3.Proposed hangs the siberian elm nutrition diagnosis the important parameter:Hangs the siberian elm N/P,K/P and K/N.Hangs the siberian elm leaf blade mineral substance nutrient condition through the analysis high production group,has separately determined the autumn nutrition transformation time tree seed mineral substance nutrient content balanced senate ratio.The DRIS diagnosis result indicated that,Hangs the siberian elm leaf blade the best ratio is N/P=10.94,K/P=0.55,N/K=6.4.Had determined the autumn nutrition transformation time,hangs the siberian elm mineral substance nutrient content the nutrition sufficient threshold value:The PLI diagnosis result is:Hangs the siberian elm nutrition threshold value is 5.75.This diagnosis result may for apply fertilizer provides the theory basis,is for the purpose of enhancing the fertilizer allocated proportion and the employment rationality and the validity.可以设最佳哦……