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在东北黑土区中心-中国科学院海伦实验站进行盆栽试验,研究不同施肥处理对大豆光合产物分配的影响。设5个肥料处理,分别为无肥(CK)、氮磷(NP)、氮钾(NK),氮磷钾(NPK)和化肥有机肥配施(NPK+OM),同时进行相应肥料的无作物处理。结果发现:光合产物的分配趋势表现出分配到地上部的比例逐渐增加,由35%增加到66%,同时地下部所占有的比例相应减少,由65%降低到34%。其中分配到根中的光合产物有4% ～20%通过根系呼吸而消耗。碳同化产物的分配受施肥的影响(P<0.05)。随着大豆的生长,土壤呼吸速率逐渐增加,在培养后的第77天,CK、NP、NK、NPK和NPKOM处理土壤呼吸速率达到最大值,分别为113、164、143、222、274 mg C.cm-2.h-1,然后逐渐降低,到生育末期达到最小值。不同施肥处理土壤呼吸速率存在差异,大小顺序为NPK +OM>NPK>NP >NK>CK,在整个生长季的变化范围分别为29 ～302,25 ～238,25 ～185,24 ～160 and 20 ～129 mg C.m-2.h-1。
Pot experiments were conducted at Helen Experimental Station, Chinese Academy of Sciences, in the center of black soil area in Northeast China to study the effects of different fertilization treatments on the distribution of photosynthate of soybean. A total of five fertilizers were set up, including no fertilizer (CK), NP, NK, NPK and NPK + OM, respectively, with no fertilizers Crop processing. The results showed that the distribution of photosynthetic products showed a gradual increase in the distribution of aboveground parts from 35% to 66%, while the proportion of underground parts decreased from 65% to 34%. Among them, 4% ~ 20% of the photosynthate distributed to the root is consumed by root respiration. The distribution of carbon assimilation products was affected by fertilization (P <0.05). With the growth of soybean, the soil respiration rate increased gradually. After 77 days, the soil respiration rates of CK, NP, NK, NPK and NPKOM reached the maximum, which were 113, 164, 143, 222 and 274 mg C .cm-2.h-1, and then gradually reduced to reach the minimum end of the growth period. The respiration rate of different fertilization treatments varied with the order of NPK + OM> NPK> NP> NK> CK, with the range of 29 ~ 302, 25 ~ 238, 25 ~ 185, 24 ~ 160 and 20 ~ 129 mg Cm-2.h-1.