香根草和水花生对垃圾污水中N、P、Cl的吸收效果

 香根草和水花生对垃圾污水中不同“污物”的吸收能力差别较大。二者对N的吸收量均超过了各自净化的总N量，对P的吸收率亦较高，但植株体内的P浓度却随介质P浓度的升高而下降。和净化量相比，植物对低浓度污水中Cl的吸收率较高，但对高浓度中的吸收率较低。和原液中的“污物”量相比时，根系对元素的吸收率都明显降低。这表明，植物净化系统中的去污方式除了根系的吸收外，还有其他方式，即根系是通过根际微生态系统的综合作用来达到净化目的。总的来说，香根草对“污物”的吸收能力不比水花生强，尽管他比水花生有更强的净化能力。

Uptake Efficiency of Vetiveria zizanioides and Althernanthera philoxeroides to N, P, Cl in Garbage Leachates

The two plant species, Vetiveria zizanioides and Althernanthera philoxeroides, presented different uptake capacities to different “pollutants” of garbage leachates. The amounts of N absorbed by plants were even more than the amounts purified by them. The plants also absorbed P very vigorously, and amounts absorbed accounted for 90% or so of those purified. However, the uptake ratios of Cl in 2 kinds of leachate assumed an enormous disparity: 2-3 times higher in low concentrated leachate than in highly concentrate leachate. Moreover, ratios of the amount of uptake to the amount of original leachate further lowered. This indicated that besides uptake of roots, other forms of pollutant removal occurred, suggesting the plant purification of waste water was in fact a comprehensive influence of the rhizospheric micro-ecosystem on pollutants. Overall, V. zizanioides did not show any stronger uptake ability than A. philoxeroides, in spite of the fact that the former had stronger purifying ability than the latter.