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采用室内模拟试验研究了沉积物扰动下上覆水中可被生物利用颗粒态磷(BAPP)的变化规律,并分析了BAPP与悬浮物中内源磷间的内在联系.试验用沉积物分别于春季和夏季采自太湖梅梁湾和月亮湾.结果表明,沉积物扰动降低了上覆水中生物有效磷(BAP)含量,降至初始状态的40%左右.BAPP也明显降低,其占BAP的百分比稳定在50%左右,梅梁湾春季除外.扰动状态下颗粒态磷(PP)生物有效性显著降低,第12h时,BAPP占PP的百分比仅为10%左右;这与悬浮物中NH4Cl-P和Fe/Al-P的降低明显相关,但其与(AAP+NH4Cl-P)占Tot-P的百分比相关性更好[r=0.565(n=48)].这暗示,沉积物扰动可能延缓了水体富营养化发展进程.
The indoor simulated experiment was conducted to study the variation of bioavailable PAP (phosphorus (BAPP)) in the overlying water under sediment disturbance and to analyze the intrinsic relationship between BAPP and endogenous phosphorus in suspended sediment. And summer were collected from Meiliang Bay and Moon Bay in Taihu Lake.The results showed that the disturbance of sediment reduced the content of bioavailable phosphorus (BAP) in the overlying water to about 40% of the initial state, and the BAPP also decreased obviously, the percentage of BAP Stable at around 50% except for Meiliang Bay in spring, the bioavailability of particulate phosphorus (PP) under disturbance was significantly reduced, and the percentage of BAPP to PP was only about 10% at the 12th hour. This is consistent with the fact that NH4Cl-P Was significantly correlated with the decrease in Fe / Al-P, but it was more correlated with the percentage of (AAP + NH4Cl-P) in the Tot-P [r = 0.565 (n = 48)]. This suggests that sediment disturbance may be delayed The eutrophication of the water development process.