铜胁迫下植物与土壤的耦合响应研究

用室内盆栽法,研究了铜胁迫退化土壤对其适生植物的选择过程和驱动力,以及适生植物对铜胁迫退化土壤的改良作用。结果显示,铜元素是铜富集退化土壤中影响植物生长的关键因子;在铜元素的胁迫下,紫穗槐（Amorpha fruticosa L.）和葛藤（Pueraria lobata）将成为这类退化土壤的适生优势植物,楸树（Catalpa bungei）、麻栎（Quercus acutissima）和梓树（Catalpa ovata G.Don）的生长受到抑制,呈局部散生,而佛甲草（Sedum lineare Thunb）和高羊茅（Festuca arundinacea）将被逐步淘汰;适生植物生长初期对铜胁迫退化土壤的pH值无明显改良作用,对全氮含量无显著影响,能解析土壤固定态磷和钾并较快地吸收磷和钾元素,促进土壤有机质含量和脱氢酶活性的提高,有效降低土壤中铜元素含量。植物与土壤的耦合响应表现出高度不对称性,即土壤往往通过自身某一极端因子就可以直接影响植物的生长,而植物对土壤多因子可同时产生影响。

Coupling Responses Between Plants and Soil Under Cu Stres

To probe the features of the ecosystem in degraded lands,the research was implemented with pot culture method to understand the coupling responses between the plants and degraded soil under Cu stress.The results show that Cu affected substantially the growth of the tested plants in soils rich in Cu.Under Cu stress,Amorpha fruticosa L.and Pueraria lobata evolved into the dominant species,and the growth of Catalpa bungei,Quercus acutissima Carruth.and Catalpa ovata G.Don were restricted and limited to a certa...