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p示踪
相关语句
  p tracer
    STUDY ON CHANGES IN FRACTIONS AND AVAILABILITY OF PHOSPHORUS IN CALCAREOUS SOIL BY  ̄(32)P TRACER METHOD
    用~(32)P示踪法研究石灰性土壤中磷素的形态及有效性变化
短句来源
  “32p示踪”译为未确定词的双语例句
    EFFECTS OF THE TOTALLY BASAL DRESSING TECHNIQUE TO WHOLE PLOUGH LAYER ON FERTILIZER UTILIZATION OF DOUBLE HARVEST RICE BY ~(15)N、~(32)P TRACERS
    应用~(15)N、~(32)P示踪法研究双季稻一次性全层施肥技术的肥料效应
短句来源
    Study on effects of phosphate activator on soybean absorbing fertilizer and soil phosphate utilization ratio using ~(32)P trace method
    利用~(32)P示踪技术研究土壤磷素活性剂对大豆吸收土壤和肥料磷素量的影响
短句来源
    Study of Circumstances of Hill Soil Erosion in Kunming by Used ~(32)P
    用~(32)P示踪法研究昆明市水土流失的规律
短句来源
    Exploring the P Utilization Efficiency of Different Application Methods in Tobacco Plants by Using ~(32)P Tracing Technique
    利用~(32)P示踪技术探讨不同施肥方法的烟株磷肥利用率
短句来源
    Effects of phosphate-dissolving fungi on transformation,fixation and efficiency of fertilizer 32 P.
    ~(32)P示踪法研究溶磷真菌对磷肥转化固定和有效性的影响
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  p tracer
The penetrating root hairs grew for 2 and 4 days in soil labelled with radioisotope phosphorus (P) tracer 32P (185 kBq g-1 dry soil) filled in another PVC tube.
      
A 32P tracer placed at a depth of 12.5, 37.5, 62.5 or 87.5 cm was employed to determine root system dynamics by sampling crop leaves at 0, 15, 30 and 45 cm lateral distance.
      
Using a 32P tracer, mosses removed from plots receiving PK in combination with NH4 maintained their affinity for increased phosphorus uptake.
      


Self-diffusion coefficients of phosphate in four soils of different texture at varying water content and temperature were measured by the methods of diffusion half-cells and diffusion tube using 32p-labelled KH2PO4 solution. The results showed that the apparent self-diffusion coefficient (Da)in the water unsaturated soils increased with increasing soil water content (W) or decreasing soil water suction (S). The relationship between Da and W or S could be described by the power equation of Da=aWb or Da=aS-b....

Self-diffusion coefficients of phosphate in four soils of different texture at varying water content and temperature were measured by the methods of diffusion half-cells and diffusion tube using 32p-labelled KH2PO4 solution. The results showed that the apparent self-diffusion coefficient (Da)in the water unsaturated soils increased with increasing soil water content (W) or decreasing soil water suction (S). The relationship between Da and W or S could be described by the power equation of Da=aWb or Da=aS-b. The effect of soil texture on Da value was closely related with moisture condition. Under the same water content, the lighter the soil texture the higher the Da value, and a significant positive correlation of Da value with clay content was observed. On the contrary, at equal water suction, a negative correlation between Da value and clay content was found normally. The porous self-diffusion coefficient (Dp) in water saturated soil was higher 102-103 fold than the Da value of the soil, but there were no differences between the soils. The Da or Dp value increased with the temperature, and every increase of temperature 10℃ within 5℃ to 45℃ caused the Da or Dp value to increase by about 10-50%, with an average of 30% or so.Moreover, nonlinear multiple regression analyses were used to investigate the relation between the interaction of soil moisture with temperature and the self-diffusion coefficient of phosphate in soil. The analytical results indicated that the interaction influenced the diffusion of phosphate clearly,and the influencing extent could be defined by the concepts of "water coefficient"and "temperature coefficient "advanced in this paper.

用32P示踪扩散池和扩散管法测定了4种不同质地土壤在不同含水量和温度下的磷自扩散系数。结果表明,非饱和土壤磷扩散系数(Da)随土壤水分含量(W)增加或土壤水吸力(S)减小而增大,符合幂函数Da=aWb或Da=aS-b关系;质地对磷扩散的影响与土壤水分条件密切相关,在同一含水量下,轻质土壤Da值大于粘质土,Da与粘粒含量呈显著负相关,而同吸力下与此恰好相反。饱和土壤磷扩散系数(Dp)比Da值通常大2—3个数量级,但不同土壤之间差异不大。5——45℃范围内,每升温10℃磷扩散系数增加量为10%一50%,平均为30%左右。多元回归分析表明,水温相互作用对磷扩散有显著影响,其影响程度可用本文提出的磷扩散率水分系数和温度系数来表征。

Five synthetic phosphates: dicalcium phosphate. octocalcium phosphate, apatite. Iron phosphate and aluminium phosphate were applied to calcareous soil to simulate Ca_2-P,Ca_8-P, Ca_10-P. Fe-P and Al-P type phosphates in the calcareous soill. ~32P was also used in testing the influence of VA mycorrhizal fungi on P uptake of corn plant from these Synthetic phosphates, fertilizer labelled with ~32P and soil phosphorus pool. Results showed that P uptake by corn plant from soil and ~32P-labelled fertjlizer was significantly...

Five synthetic phosphates: dicalcium phosphate. octocalcium phosphate, apatite. Iron phosphate and aluminium phosphate were applied to calcareous soil to simulate Ca_2-P,Ca_8-P, Ca_10-P. Fe-P and Al-P type phosphates in the calcareous soill. ~32P was also used in testing the influence of VA mycorrhizal fungi on P uptake of corn plant from these Synthetic phosphates, fertilizer labelled with ~32P and soil phosphorus pool. Results showed that P uptake by corn plant from soil and ~32P-labelled fertjlizer was significantly increased by inoculating Glomus mosseae. Except apatite, all other four synthetic phosphates could be used by both mycorrhizal and non-mycorrhizal corn plant, however VA mycorrhizal fungi infection increased the absorbtion. Although the highest benefit of inoculating VA mycorrhizal fungi was obtained under condition of applying apatite, neither mycorrhizal nor non-mycorrhizl plant could used P in apatite.It is concluded that both mycorrhizal and non-mycorrhizal plant absorbing P from the same sources or phosphate forms-available P and slow- exchangable P in the calcareous soil. inoculating VA mycorrhizal fungi can increase their bioavailability.

用32P示踪法研究了VA菌根真菌对石灰性土壤不同形态磷酸盐有效性的影响。结果表明,VA菌很真菌显著增加了玉米吸收肥料和土壤的磷量。菌根植物和非菌根植物都可不同程度地吸收利用土壤中的Ca_2-P、Ca_8-P、Fe-P和Al-P,VA菌根真菌增加了玉米对它们的吸收。试验结果还表明,施Ca_(10)-P时接种VA菌很真菌对玉米生长的促进作用比施用其它磷酸盐明显,但Ca(10)-P不能直接被玉米植株所利用。说明VA菌根真菌能提高土壤中的有效性磷(Ca_2-P和Al-P)和缓效性磷(Ca_8-P和Fe-P)的有效性。

The phosphorus transport character in 3 states (wind dry soil,wind dry soil after CaCO3 elimination and natural soil) of 4 kinds of soils (loessial soil,black Lu soil,Lou soil and yellow cinnamon soil) in Shaanxi Province was studied by using isotopic tracer (32P).The results showed that the phosphorus transport parametres calculated by two kinds of method equibrium and CXTFIT program methods were able to describe the process of phosphorus transport.The CXTFIT program method was superior to the equibrium...

The phosphorus transport character in 3 states (wind dry soil,wind dry soil after CaCO3 elimination and natural soil) of 4 kinds of soils (loessial soil,black Lu soil,Lou soil and yellow cinnamon soil) in Shaanxi Province was studied by using isotopic tracer (32P).The results showed that the phosphorus transport parametres calculated by two kinds of method equibrium and CXTFIT program methods were able to describe the process of phosphorus transport.The CXTFIT program method was superior to the equibrium method because the former could be directly applied to breakthrough curve and to determining the phosphorus transport parametres.

应用同位素(32P)示踪法研究了陕西省4种土壤(黄绵土、黑垆土、土娄土和黄褐土)的3种处理状态(风干、去CaCO3风干和原状)磷素运移特征。结果表明,平衡方法和CXTFIT程序拟合法求出的土壤磷素运移参数,都可以较好地描述磷素运移过程的特征;由于CXTFIT程序拟合法直接应用穿透曲线拟合,还可应用于原状土壤中磷运移参数的推求,所以,与平衡法相比CXTFIT程序拟合法更优。

 
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