In general the negative pressure potential of the xylem is equal to the water potential of the surrounding cells minus the osmotic potential that the solutes dissolved in the xylem sap creates.

• 一般来说木质部的负压潜力与周围的细胞的水潜力是相等的减在木质部树汁溶化的溶质创造的渗透的潜力的。