沈阳浑河段硬质护岸生态复绿中的4种植物抗旱性比较

Drought Resistant Adaptability of Four Kinds of Plants for Ecologic Greening the Horniness Revetment in Hunhe River, Shenyang

为了选择出更加适宜植入沈阳浑河段生态复绿的植物材料,对卧茎景天、白三叶、小冠花和草地早熟禾4种植物的叶绿素含量、根冠比等生长指标进行测定。结果表明:随着土壤含水量(RWC)下降,卧茎景天和小冠花叶绿素含量先下降后增加;RWC为20%～30%时,卧茎景天的植株含水量最高,仅比对照下降8.47%;根冠比随RWC下降先下降后上升,4种植物中卧茎景天变化最显著;比叶重随RWC下降呈下降趋势;4种植物的游离脯氨酸含量变化情况不同。综上,4种植物的抗旱适应性顺序由强到弱依次为:卧茎景天>小冠花>白三叶>草地早熟禾。

In order to select an appropriate plant for Hunhe River in Shenyang for the implantation of ecological rehabilitation, 4 kinds of plants, Sedum sarmentosum Bunge, Trifolium repens, Coronilla varia, and Poa pratensis were studied in chlorophyll content, root and shoot growth and some other indexes. With the decline in soil moisture （RWC）, Sedum sarrnentosum Bunge and Coronilla varia first decreased and then increased chlorophyll content,when RWC was 20%-30%, the plant water content of Sedum sarmentosum Bunge was the highest with a decrease by 8.47% compared with the control. Root shoot ratio in RWC first decreased and then increased, Sedum sarmentosum Bunge had the largest change. Specific leaf weight decreased with decrease of RWC. Free proline content changed differently for the 4 species. Drought resistant adaptability of the four plants from strong to weak： Sedum sarmentosum Bunge〉 CoroniUa varia〉 Trifolium repens〉 Poa pratensis.