Effect of nitrate supply on the facilitation between two salt-marsh plants (Suaeda salsaaanddScirpus planiculmis)

在被漂洗过的土壤中种植盐地碱蓬和扁秆藨草的幼株，实验中设置三种处理：种间相互作用处理（混合培养或者单独培养）、三个盐度水平处理（1、50和100 mmol L-1）以及三个硝酸盐水平处理（0.5、5和10 mmol L-1）。结果表明，过量施用硝酸盐会在盐度梯度中改变胁迫梯度假说的预测，从而导致在盐沼中这两个物种共存的崩溃。

Young seedlings of Suaeda salsa and Scirpus planiculmis were planted in leached soil. Three experimental treatments were established: interspecific interaction treatment (mixed cultivation or monoculture), three salinity levels (1, 50, and 100 mmol L⁻¹), and three nitrate levels (0.5, 5, and 10 mmol L⁻¹). The results showed that excessive nitrate application would alter the predictions of the stress gradient hypothesis along the salinity gradient, thereby leading to the collapse of coexistence between the two species in salt marshes.