摘要
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。
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 certain area,but Sedum lineare Thunb and Festuca arundinacea were eliminated in the end.The Cu-resistant plants partially affected the properties of the soil used for pot culture during the period of growth： organic matter content and dehydrogenase activity of tested soil were improved significantly,pH value and total Kjeldahl Nitrogen content remained stable,while P,K and Cu concentrations decreased to some extent.It was concluded that the plants interacted asymmetrically with soil in the ecosystem.For instance,the soil affects obviously the growth of plant merely by one of its limiting factors,whereas the plant influences multiple variables of the soil in the growth process.
出处
《水土保持通报》
CSCD
北大核心
2011年第5期90-94,共5页
Bulletin of Soil and Water Conservation
基金
中央级公益性科研院所基本科研业务费专项"重金属矿区土壤质量因子与抗逆固氮植物的耦合响应"
"湿生木本植物对典型污染物的吸收
转运和累积机制研究"(RISF6924
RISF6803)
浙江省林业科研项目"浙江滨海盐碱地生态修复与高效利用技术研究"(08A02)
