酸雨胁迫下乡土植物根际土壤的化学行为  

Chemical Behavior of Rhizosphere Soil of Native Plants to Different Acid Rain Stress

作　　者：周光益[1,2] 田大伦[1] 杨乐苏[2] 王旭[2] 邱治军[2] 刘敏[2] 

机构地区：[1]中南林业科技大学,长沙410004 [2]中国林业科学研究院热带林业研究所,广州510520

出　　处：《林业科学》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)

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.

关 键 词：酸雨胁迫 根际土壤 化学行为 

分 类 号：S714.2[农业科学—林学]