贵州白及土壤与植株间硒的相关性

Correlation of Se Between Soil and Plant of Bletilla striata in Guizhou

【目的】为白及富硒资源的合理开发及保护提供科学依据。【方法】对贵州省不同生长环境、不同种植年限白及生长土壤中全硒的含量、白及不同采收时期和不同部位植株中硒元素含量进行检测,探讨白及块茎中硒元素随采收时间的动态特征,分析白及块茎的富集特征,讨论白及生长土壤与植株间硒的相关关系。【结果】野生白及生长的土壤硒元素含量高于人工栽培的白及土壤硒含量,且野生白及土壤硒含量约是人工栽培的3倍;不同种植年限下白及土壤硒含量为3年>2年>1年,而不同种植年限下白及块茎硒含量为1年>3年>2年;白及叶中硒含量高于须根和白及块茎,白及块茎硒随种植时间延长变化不明显,须根和叶中硒含量随种植时间延长先降低后增加。【结论】白及叶中硒元素与土壤中硒元素呈显著正相关关系,白及须根中硒元素与土壤中硒元素呈显著负相关关系。

【Objective】The objective of the paper is to provide the scientific basis for rational exploitation and protection of Bletilla striata Se-enriched resources.【Method】The total Se content in soil for B.striata growth with different habitat and different cultivation years and Se content in B.striata harvested at different stages and different part of plants are determined,and the dynamic characteristics of Se in B.stri-ata tuber with harvesting time was discussed,then the enrichment characteristics of B.striata tuber was analyzed to discuss the correlation of Se between growing soil and plant of B.striata.【Result】The Se content in soil for wild B.striata growth was higher than that in soil for arti-ficial cultivation of B.striata,and Se content in soil for wild B.striata was three times higher than that in soil for artificial cultivation.The Se content in soil cultivated B.striata with different planting years was three years>two years>one year,while the Se content in B.striata tuber with different planting years was one year>three years>two years.The Se content in B.striata leaves was higher than that in fibrous root and tuber.The Se content in B.striata tuber did not vary significantly with harvesting time.The Se content in fibrous root and leaves of B.striata decreased first and then increased with harvesting time.【Conclusion】The Se content in B.striata leaves is positively related to Se content in soil significantly,while Se content in B.striata fibrous root is negatively related to Se content in soil significant-ly.