摘要
对深圳福田红树林土壤的调查显示各种土壤化学特征指标沿横向断面(大致平行于海岸线)的变异很大,而沿纵向断面(自岸向海方向)的变异则相对较小。总的来说,由于受污水的影响,福田红树林土壤中多种重金属和磷素的含量增高。福田红树林土壤中黄铁矿的累积状况似乎与土壤所含有机质的丰度无关,表明有机质并不是该区土壤中黄铁矿累积的制约因子。虽然从EC和HCl可提取铁与无机还原态S的弱相关关系可推断出土壤水溶性硫酸根和可反应铁的增加有利于黄铁矿的累积,但两者对黄铁矿在土壤中累积方面单独所起的调控作用实际上有一定限度。
The results from the investigations on the mangrove soils in the Futian Nature Reserve, Shenzhen show that the chemical characteristics of the soils vary widely along the transect approximately parallel to the coastline, while the variations in soil chemical parameters along the transect approximately perpendicular to the coastline are relatively insignificant. As a result of contamination by wastewaters discharging into the mangrove wetland from the surrounding urbanized areas, the bio-available concentrations of many heavy metals are much higher, compared to those in the mangrove soils occurring in the front part of the Pearl River Delta. Concentrations of total and available P were higher in the soils affected by wastewater than those not directly affected by wastewater. It appears that the accumulation of pyrite in the mangrove soils in Futian is not related the abundance of organic matter, indicating that organic matter has not been a limiting factor for pyrite accumulation in this site. Inorganic reduced S is somewhat related to EC and the HCl-extractable Fe, suggesting that increases in soluble sulfate and reactive iron may favor the accumulation of pyrite in the soils. However, because the correlation coefficients are not sufficiently great (R2 <0.2), the controls of soluble sulfate and reactive iron on pyrite accumulation may be limited.
出处
《生态科学》
CSCD
2004年第2期118-123,共6页
Ecological Science
