本研究主要探討在溫度、水分與鹽分逆境下，對土人參 (Talinum triangulareWilld.) 種子發芽之影響。試驗結果如下：可發芽之溫度範圍為25-45℃，最適發芽溫度為35℃/30℃(光照/黑暗)之變溫環境，當溫度於20℃/15℃或50℃/45℃時即無法發芽；恆溫下35℃為最適生長溫度，在20℃或50℃則無法發芽，但變溫下發芽之表現較恆溫佳。可發芽之水分潛勢為0 MPa 至-0.2 MPa 之間，最適水分潛勢為0 MPa。鹽分濃度0%至0.8%之間可發芽，高於0.8%則無法發芽，當適合溫度35/30℃時，在0.8%鹽分濃度下尚有56.7%之發芽率。故土人參種子適合於高溫環境下發芽，對於水分有相當的需求，但對鹽分變化有一定程度之耐受性。

The germination requirements of Talinum triangulare were studied under controlconditions in the laboratory. Treatments included 7 temperature regimes (fluctuatingday : night temperature regimes of 50℃ : 45℃, 45℃ : 40℃, 40℃ : 35℃, 35℃ : 30 ℃,30℃ : 25℃, 25℃ : 20℃ and 20℃ : 15℃), 6 water potential levels (0 MPa、-0.05MPa 、-0.1 MPa、-0.2 MPa、-0.3 MPa and -0.4 MPa),and 9 salinity concentrations(0%、0.05%、0.1%、0.2%、0.3%、0.4%、0.6%、0.8% and 1.0% NaCl), using a completelyrandomized design with 3 replications.The seeds germinated at temperatures between25 and 45℃ with the optimum. The best germinate temperatures was 35/30℃ ofalternate temperatures. If the alternate temperatures was 50/45℃ (light/dark) and 20/15℃, the seed can’t germinate. The best germinate temperatures was 35℃ of constanttemperatures. If the constant temperatures was 50℃ and 20℃, the seed can’t germinate.The seeds germinated at water potentials between 0 MPa and –0.2 MPa with theoptimum. The best water potentials was 0 MPa. The seeds germinated at salt stressbetween 0% and 0.8% with the optimum. If the salt stress higher with 0.8%, the seedwasn’t germinate. When the alternate temperatures were 25/20℃ and salt stress was0.6%, the seeds germination only was 0.7%. When the alternate temperatures were35/30℃ and salt stress was 0.8%, the seeds germination was 56.7%. When the alternatetemperatures were 40/35℃ and salt stress was 0.6%, the seeds germination was 42.7%.The optimum temperatures can enhance the Talinum triangulare Willd. ’s salt stresslevel.