Seedling germination technique of Carex brunnescens and its application in restoration of Maqu degraded alpine grasslands in northwestern China

JianJun Kang; WenZhi Zhao; CaiXia Zhang; Chan Liu; ZhiWei Wang; HaiJun Wang

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Seedling germination technique of Carex brunnescens and its application in restoration of Maqu degraded alpine grasslands in northwestern China

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Carex brunnescens(Pers.)Poir.is considered to be the only clonal herb found to date that can develop and form fixed dunes in Maqu alpine degraded grasslands of northwestern China.However,due to strong dormant characteristics of C.brunnescens seeds,the sand-fixing effect of the plant is severely limited.This study explores a technique that can rapidly promote the seed germination of C.brunnescens,and also investigates the adaptation and sand-fixing effect by cultivating C.brunnescens seedlings to establish living sand barriers in the sand ridges of moving sand dunes.Results show that the seed germination rate obtained a maximum of 63.7%or 65.1%when seeds were treated with 150 mg/L gibberellic acid(GA3)for 24 h followed by soaking in sulfuric acid(98%H2SO4)for 2.5 min or sodium hydroxide(10%NaOH)for 3.5 h,and then germinated(25°C in daytime and 5°C at nighttime)in darkness for 10 d.After breaking seed dormancy of C.brunnescens,the living sand barrier of C.brunnescens(plant spacing 15−20 cm;sand barrier spacing 10−20 m)was established in the perpendicular direction to the main wind in the middle and lower parts of the sand ridges on both sides of the moving sand dunes.When the sand ridges were leveled by wind erosion,the living sand barrier(plant spacing 15−20 cm;sand barrier spacing 0.5−1.0 m)of C.brunnescens was reestablished on the wind-eroded flat ground.Finally,a stable sand-fixing surface can be formed after connecting the living sand barriers on both sides,thus achieving a good sand-fixing effect.These findings suggest that rapid seed germination technology combined with the sand−fixing method of C.brunnescens can shorten the seed germination period and make the seedling establishment become much easier which may be an effective strategy to restore and reconstruct Maqu degraded grasslands.

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《寒旱区科学：英文版》 |2020年第5期|P.295-305|共11页
作者
JianJun Kang; WenZhi Zhao; CaiXia Zhang; Chan Liu; ZhiWei Wang; HaiJun Wang;
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作者单位

Linze Inland River Basin Research Station Key Laboratory of Inland River Basin Ecohydrology Northwest Institute of Eco-Environment and Resources Chinese Academy of Science Lanzhou Gansu 730000 China;

Linze Inland River Basin Research Station Key Laboratory of Inland River Basin Ecohydrology Northwest Institute of Eco-Environment and Resources Chinese Academy of Science Lanzhou Gansu 730000 China;

Linze Inland River Basin Research Station Key Laboratory of Inland River Basin Ecohydrology Northwest Institute of Eco-Environment and Resources Chinese Academy of Science Lanzhou Gansu 730000 China;

Linze Inland River Basin Research Station Key Laboratory of Inland River Basin Ecohydrology Northwest Institute of Eco-Environment and Resources Chinese Academy of Science Lanzhou Gansu 730000 China;

Guizhou Institute of Prataculture Guizhou Academy of Agricultural Sciences Guiyang Guizhou 550006 China;

Zhangye Academy of Agricultural Sciences Zhangye Gansu 734000 China;

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原文格式 PDF
正文语种 chi
中图分类植物学;
关键词
Carex brunnescens; living sand barrier; Maqu degraded grasslands; moving sand ridge; sand-fixing method; seed germination technique;

机译：Carex Brunnescens;生活沙障;Maqu退化草原;移动砂脊;砂固定方法;种子萌发技术;

Seedling germination technique of Carex brunnescens and its application in restoration of Maqu degraded alpine grasslands in northwestern China

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