Residual of Exogenous Selenium in Forest Soils and Its Effect on Some Wild-Vegetable Plants

作者 Sang Ying; Hao Jingmei; Li Guojiang; Cui Xiaoyang

期刊 Journal of North-East Forestry University , 2007,7:35

摘要 A series of selenium application experiments were conducted to cultivate selenium-enriched forest vegetables in the mountainous regions of northeast China. Selenium fertilizer (Na_2SeO_3) was added to the top 0 ~ 15 cm soil layer with a dosage gradient of 0.066, 0.222, 0.666, 2.222 and 6.666g/m~2. Results show that typical dark brown forest soil has a high capacity of reserving selenium in the chemical form of Na_2SeO_3, judging from the fact that 70% ~ 97% of the applied selenium was still retained in the top 15 cm soil layer 5 months after application. All the five experimental wild-vegetable plants, Mat-teuccia struthiopterls, Athyrium multidentatum, Aegopodium alpestre, Taraxacum mongolicum, Allium macrostemon, are capable of accumulating selenium excessively under the condition of strengthened soil selenium supply, with plant selenium concentrations 10 ~100 times higher than that of the control (CK). The reasonable application rate of selenium is less than 2.222 g/m~2 for most plants, and less than 0. 666 g/m~2 for Matteuccia struthiopterls. It is concluded that exogenous selenium application to typical dark brown forest soil is an effective way to cultivate selenium-enriched forest vegetables.

涉及物种 蒲公英 Taraxacum mongolicum 薤白 Allium macrostemon 东北蹄盖蕨 Athyrium brevifrons 东北羊角芹 Aegopodium alpestre