Silicon accumulation by Phragmites australis positively responds to rise in groundwater depth in the desert oasis areas of the HeXi Corridor, China
文献类型： 外文期刊
作者： Kang, Jianjun 1 ; Zhao, Wen Zhi 1 ; Zhang, Cai Xia 1 ; Wang, Zhiwei 2 ; Li, Hong 3 ;
作者机构： 1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basins, Linze Inland River Basin Res Stn,Chinese Ecosyst, Lanzhou 730000, Gansu, Peoples R China
2.Guizhou Acad Agr Sci, Guizhou Inst Prataculture, Guiyang, Peoples R China
3.Lanzhou Vocat Tech Coll, Lanzhou, Peoples R China
关键词： desert oasis; different landscape habitats; ecological restoration; Gramineae; Si-rich characteristic
期刊名称：LAND DEGRADATION & DEVELOPMENT （ 影响因子：4.977； 五年影响因子：5.291 ）
ISSN： 1085-3278
年卷期： 2021 年 32 卷 15 期
页码：
收录情况： SCI
摘要： Our study investigated the characteristics of Phragmites australis (Gramineae) silicon (Si) accumulation, and the response relationship between P. australis Si accumulation and groundwater depth changes. Plants were dug out and taken back to the laboratory for Si accumulation analysis, and a supplementary survey of P. australis Si accumulation was conducted among different groundwater depths. Result showed that Si absorbed and accumulated by P. australis mainly came from the soil and the Si accumulation differed significantly in tissues and growth stages, and the total Si accumulations (withering stage) of P. australis in sand dune (SD), desert steppe (DT), interdune lowland (IL), saline meadow (SM), and wetland (W) habitats were 7.09%, 6.77%, 5.72%, 7.73%, and 8.12%, respectively. More importantly, P. australis Si accumulation was almost equal to the total accumulation of nitrogen, phosphorus, and potassium, and even higher than of the total accumulation of calcium, magnesium, and sulfur. P. australis Si accumulation (withering stage) reduced first from SD to DT habitat, and then increased remarkably from DT to W habitat with a significant increase of -23.95% and 41.96%, respectively. P. australis Si accumulation positively responds to the groundwater depths, and the relationship was an increasing linear function of one variable. Our findings suggested that accumulating Si might be one of the effective strategies for P. australis to adapt to adverse habitats, and the Si-rich characteristic of P. australis was likely to lay a solid theoretical foundation for exploring effective measures to restore and reconstruct the degraded ecosystems in desert oasis areas.
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