深圳福田红树林无瓣海桑与海桑群落的重金属累积和循环

研究了深圳福田红树林无瓣海桑与海桑群落对重金属Cu、Pb、Zn、Cr、Ni元素的吸收、累积、分布和循环.结果表明,该林地表层土壤(0～30cm)Cu、Pb、Zn、Cr、Ni元素的储量关系为Zn＞Pb＞Ni＞Cr＞Cu;群落中3种植物对土壤中5种重金属元素富集能力的大小依次为海桑＞无瓣海桑＞秋茄.该群落Cu、Pb、Zn、Cr、Ni的现存累积量分别为:23019.61、23429.65、117870.41、6835.79、12995.08μg/m²;年吸收量分别为:6592.20、266

Accumulation and Cycle of Heavy Metal in Sonneratia apetala and S.caseolaris Mangrove Community at Futian of Shenzhen,China

The absorption, accumulation, distribution and cycle of Cu, Pb, Zn, Cr and Ni in S. apetala and S. caseolaris Mangrove Community at Futian Mangrove Nature Reserve of Shenzhen were studied. The results showed that the Cu, Pb, Zn, Cr and Ni contents in forest soil were increased from bottom to surface layer, and the storage of the five heavy metals in the surface layer(depth 0-30 cm) was Zn > Pb > Ni > Cr > Cu. The concentration ability was S. caseolaris > S. apetala > K. candel. The existing accumulation of Cu, Pb, Zn, Cr and Ni in the community were respectively 23,019.61 micrograms/m2, 23,429.65 micrograms/m2, 117,870.41 micrograms/m2, 6835.79 micrograms/m2, 12,995.08 micrograms/m2. The annual absorption were 6592.20 micrograms/m2, 2664.77 micrograms/m2, 24,123.56 micrograms/m2, 853.25 micrograms/m2, 1990.86 micrograms/m2, respectively. The annual return were 3179.50 micrograms/m2, 1300.64 micrograms/m2, 8401.31 micrograms/m2, 398.99 micrograms/m2, 646.20 micrograms/m2, respectively. The annual net retention accumulation of Cu, Pb, Zn, Cr and Ni in the community were 3413.07 micrograms/m2, 1364.13 micrograms/m2, 15,722.25 micrograms/m2, 454.25 micrograms/m2, 1344.66 micrograms/m2. The turn over period of Cu, Pb, Zn, Cr and Ni were 8, 19, 15, 18 and 21 years.