干旱区生态环境知识资源中心(Arid): 高寒沙化草地中先锋灌木根系水浸提液对4种高原牧草的化感效应分析

Arid

	高寒沙化草地中先锋灌木根系水浸提液对4种高原牧草的化感效应分析
其他题名	Allelopathy of the Root Aqueous Extracts of Pioneer Shrub Species on Alpine Forage Species in the Restoration Course of the Alpine Desertification Meadow
	曾凯 1; 刘琳 1; 蔡义民 2; 孙飞达 1; 陈有军 3; 陈冬明 4
来源期刊	西北植物学报
ISSN	1000-4025
出版年	2017
卷号	37 期号:7 页码:1312-1322
中文摘要	以川西北沙化地生态修复治理过程中2种先锋灌木植物高山红柳(Salix cupularis)和沙棘(Hippophae rhamnoides)为供体植物,中华羊茅(Festuca sinensis) 、燕麦(Avena sativa)、垂穗披碱草(Elymus nutans)和老芒麦(E. sibircus)等4种高原优质牧草为受体植物,比较2种先锋灌木的根系水浸提液,对受体植物种子发芽率、幼苗生长以及抗氧化保护酶活性的化感效应的差异,为先锋灌木选择适宜伴生的经济牧草植物提供理论依据。结果显示:2种灌木根系水浸提液对受试植物生长均具有显著的化感效应,且基本表现出低促高抑的规律。(1)燕麦、中华羊茅、垂穗披碱草和老芒麦种子发芽率在沙棘和高山红柳根系浸提液为10和20 g· L~(-1)时均得到显著提高,当浸提液浓度达80 g · L~(-1)后基本表现出抑制作用,但只有沙棘浸提液处理下燕麦和中华羊茅达到显著水平。(2)2种根系水浸提液处理下燕麦和中华羊茅幼苗根系生长被完全抑制,但垂穗披碱草只在浓度为80 g · L~(-1)时才出现抑制现象;当沙棘根系浸提液为20 g· L~(-1)时对燕麦和垂穗披碱草的叶长和鲜重均有显著的促进作用,而高山红柳仅对中华羊茅具有显著促进效应。(3)沙棘根系浸提液为20 g· L~(-1)时,对4种受体幼苗体内过氧化氢酶(CAT)和超氧化物歧化酶(SOD)活性均有显著或极显著的促进效应;浓度为20和40 g · L~(-1)的高山红柳根系浸提液,能极显著提高燕麦和老芒麦的CAT活性以及中华羊茅的SOD活性,但浓度为40 g · L~(-1)时对燕麦和垂穗披碱草SOD活性有显著的抑制作用;4种受体植物幼苗MDA含量变化趋势均基本与酶活性吻合,能较好地反映酶活性变化下其受到的氧化胁迫程度。(4)综合化感效应指数(SE)显示,垂穗披碱草对2种灌木根系水浸提液适应性最好,其抑制浓度均为80 g · L~(-1);各浓度根系浸提液处理中,高山红柳对燕麦和中华羊茅的促进效应均高于沙棘,但沙棘对垂穗披碱草和老芒麦则表现出更强的促进优势。
英文摘要	We selected the two shrubs Hippophae rhamnoides and Salix cupularis as the donator vegetation,which was pioneer species in the restoration process of desertification alpine meadow, meanwhile selected Festuca sinensis,Avena sativa, Elymus nutans,and E. sibiricus as the receptor vegetation. In order to find the suitable associated herb species which can co-occur with them, we compared the different effects of root aqueous extracts of the two shrubs on four different alpine forage species, including seed germination rate, seedling growth and antioxidant enzyme activities. The results showed that two kinds of root aqueous extracts of the pioneer species produced significant allelopathy effect on the four herbs and most of them indicated a tendency of inhibition under high concentration, but stimulation under low concentration. (1) Root aqueous extracts from the two shrubs facilitated significantly seed germination rate of each herb species under the 10 to 20 g · L_1 concentration(P<0.05),but subsequently it turned to inhibition with the concentration increasing. Except that seed germination of E. nutans was inhibited only under the concentration of 80 g · L~(-1),and the other herb species’ germination decreased significantly(P<0.05). (2) The roots of F. sinensis and A. sativa seedling were absolutely inhibited by two kind of root aqueous extracts, but E. nutans only was inhibited when concentration reached 80 g · L~(-1); the root aqueous extract of H. rhamnoides when concentration was 20 g · L~(-1) could significantly promoted the growth of A. sativa and E. nutans’ leaf and fresh weight (P<0.05),while S. cupularis only promoted F. sinensis. (3) When the concentrationof root aqueous extract of H. rhamnoides was 20 g · L~(-1), the activities of CAT and SOD in every kind of receptor vegetation were stimulated significantly(P<0.05); when the concentration of root aqueous extract of S. cupularis was 20 g · L~(-1) and 40 g · L~(-1), the activities of CAT in A. sativa and E. sibiricus and SOD in F. sinensis were improved significantly(P<0.05),but it inhibited the activity of SOD in A. sativa and E. nutans when concentration was 40 g · L~(-1) (P<0.05). Corresponding to changes in the activities of enzymes, the content of MDA reduced first and then increased. (4) According to the synthetical allelopathic index, E. nutans has best adaptation on root aqueous extracts of two shrub species,only inhibited under the concentration of 80 g · L~(-1). All in all, S. cupularis facilitated the germination rate, seedling growth and the activities of antioxidant enzymes of F. sinensis and A. sativa better than that of H. rhamnoides, and moreover H. rhamnoides was more suitable with E. nutans and E. sibiricus.
中文关键词	高寒沙化草地 ; 先锋灌木 ; 根系水浸提液 ; 化感作用 ; 发芽率 ; 抗氧化醇
英文关键词	alpine desertification meadow pioneer shrubs root aqueous extracts allelopathy germination rate antioxidant enzyme
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6042931
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236817
作者单位	1.四川农业大学动物科技学院, 成都, 四川 611130, 中国; 2.日本畜产草地研究所, 东京, 329-2793; 3.西南民族大学青藏高原研究院, 成都, 四川 610041, 中国; 4.四川省甘孜藏族自治州畜牧业科学研究所, 康定, 四川 626000, 中国
推荐引用方式 GB/T 7714	曾凯,刘琳,蔡义民,等. 高寒沙化草地中先锋灌木根系水浸提液对4种高原牧草的化感效应分析[J],2017,37(7):1312-1322.
APA	曾凯,刘琳,蔡义民,孙飞达,陈有军,&陈冬明.(2017).高寒沙化草地中先锋灌木根系水浸提液对4种高原牧草的化感效应分析.西北植物学报,37(7),1312-1322.
MLA	曾凯,et al."高寒沙化草地中先锋灌木根系水浸提液对4种高原牧草的化感效应分析".西北植物学报 37.7(2017):1312-1322.