摘要
A short-term exposure experiment of 19 native plant species was carried out from May 2006 to August 2008 at two sites with different stresses of acid rain pollution（HP:Guangzhou Petrochemical Factory in Huangpu represents a contaminated area;LXH:Liuxihe National Forest Park represents a relative clean area）.Total 76 soil samples,collected from rhizospheres of those tested plants and the nearby bulk soil,were analyzed to investigate chemical behaviors of rhizosphere soil under the different acid rain pollution.Meanwhile,soil samples of rhizosphere of Schima superba and the nearby bulk soil under a longer-term pollution were also collected and analyzed for further confirmation.The results showed:（1）Soil major ions（H+,Al 3+,Cl-,NO3-,SO4 2-,K+,NH4+）contents in the serious acid rain stress area were higher than that in the relative clean area and the serious acid rain stress induced an increase in leaching Ca 2+,however promoted Ca 2+ transfer from bulk soil to rhizosphere soil.（2）The nutrient content of rhizosphere soil was in general higher than that of bulk soil.（3）There were antagonistic actions and negative correlations between Ca 2+（as well as organic matter）and Al 3+ in rhizosphere soil.（4）Acid rain significantly caused Al release,the ratio of exchangeable Al and exchangeable Ca（Al/Ca）of the soil in serious acid rain pollution area was larger than that in the relative clean area.（5）There was a close correlation between Al 3+ and organic acid in the soil,which suggested that the plant roots would excrete more organic acid with the enhancing acid stress for complexing Al 3+ in the root sphere to lessen the toxicity of aluminum.
A short-term exposure experiment of 19 native plant species was carried out from May 2006 to August 2008 at two sites with different stresses of acid rain pollution（HP：Guangzhou Petrochemical Factory in Huangpu represents a contaminated area;LXH：Liuxihe National Forest Park represents a relative clean area）.Total 76 soil samples,collected from rhizospheres of those tested plants and the nearby bulk soil,were analyzed to investigate chemical behaviors of rhizosphere soil under the different acid rain pollution.Meanwhile,soil samples of rhizosphere of Schima superba and the nearby bulk soil under a longer-term pollution were also collected and analyzed for further confirmation.The results showed：（1）Soil major ions（H＋,Al 3＋,Cl-,NO_3-,SO_4 2-,K＋,NH_4＋）contents in the serious acid rain stress area were higher than that in the relative clean area and the serious acid rain stress induced an increase in leaching Ca 2＋,however promoted Ca 2＋ transfer from bulk soil to rhizosphere soil.（2）The nutrient content of rhizosphere soil was in general higher than that of bulk soil.（3）There were antagonistic actions and negative correlations between Ca 2＋（as well as organic matter）and Al 3＋ in rhizosphere soil.（4）Acid rain significantly caused Al release,the ratio of exchangeable Al and exchangeable Ca（Al/Ca）of the soil in serious acid rain pollution area was larger than that in the relative clean area.（5）There was a close correlation between Al 3＋ and organic acid in the soil,which suggested that the plant roots would excrete more organic acid with the enhancing acid stress for complexing Al 3＋ in the root sphere to lessen the toxicity of aluminum.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2009年第11期161-166,共6页
Scientia Silvae Sinicae
基金
国际合作项目(2007DFA31070)
广州市林业局项目(流溪河水源林生态水文功能与效益监测研究)
关键词
酸雨胁迫
根际土壤
化学行为
acid rain stress
rhizosphere soil
chemical behavior
Guangzhou
