【目的】明确荞麦Fagopyrum esculentum Moench的源库关系。【方法】以荞麦品种丰甜1号为材料，在开花后7 d进行减库处理(剪去未开花朵与花序)，以未处理的作对照，测定荞麦的主要农艺性状和代谢产物的含量，并使用Richards方程模拟种子的灌浆进程。【结果】灌浆中前期减库处理，荞麦叶片可溶性糖和叶绿素含量与对照差异不显著，成熟期株高、分枝数、主茎节数与对照差异不显著。减库处理有利于荞麦灌浆中前期籽粒碳水化合物的快速积累，但成熟期单株粒数和单株粒质量与对照差异不显著，且产量显著下降。减库处理和对照曲线方程的决定系数R2分别为0.996和0.992，拟合度较好。【结论】Richards生长曲线能较好拟合荞麦灌浆进程;源不足或光合产物分配不合理是限制荞麦产量提高的重要因素,调控光合产物合成及有效分配是提高甜荞产量的有效途径。
【Objective】To explore the source-sink relationship in buckwheat（Fagopyrum esculentum Moench). 【Method】The common buckwheat cultivar Fengtian 1 was selected as material. Treatment(cutting the unopened flowers and inflorescences) was conducted at the 7th day after flowering, and non-treatment was used as control. The major agronomic characteristics and metabolite contents were measured, and the grain filling process was evaluated with Richards mathematical equation. 【Result】There was no significant difference in the contents of soluble sugar and chlorophyll between sink-limiting treatment and control during the early-middle grain filling, as well as the plant height, branch number, node number at maturity. The carbohydrate accumulation was accelerated during the early-middle grain filling under sink-limiting treatment. However, there was no significant difference in the grain number per plant and grain weight per plant between sink-limiting treatment and control. Compared with control, the yield of treatment significantly decreased. The determination coefficients (R2)of treatment and control were 0.996 and 0.992 respectively, which showed that the Richards growth curve well reflected buckwheat grain filling process.【Conclusion】The Richards growth curve is suitable for estimating buckwheat grain filling process. The insufficient source or unreasonable distribution of photosynthate is an important limiting factor for buckwheat yield improvement. Adjusting photosynthate synthesis and allocation should be effective to increase buckwheat yield.