干旱区生态环境知识资源中心(Arid): 蒿类荒漠草地土壤种子库特征及其萌发植物多样性对降水增加的响应

Arid

	蒿类荒漠草地土壤种子库特征及其萌发植物多样性对降水增加的响应
其他题名	Response to increasing precipitation in Artemisia desert grassland of soil seed bank composition and species diversity of germinating plants
	田梦 1; 孙宗玖 2; 李莹 1; 李培英 2; 谢开云 2
来源期刊	草业学报
ISSN	1004-5759
出版年	2019
卷号	28 期号:12 页码:17-28
中文摘要	为揭示土壤种子库种子萌发对降水增加的适应规律,采用人工模拟降水方法,对不同降水量[对照(CK)、增加5% (W_5)、增加10% (W_(10))、增加15% (W_(15))、增加20% (W_(20))、增加25% (W_(25))]下中度退化伊犁绢蒿荒漠土壤可萌发种子库种子萌发数量及其多样性进行了调测。结果表明:0~5 cm土层土壤种子库萌发物种数及其萌发总密度随降水量增加呈上升趋势,且W_(20)、W_(25)下萌发密度显著高于其他处理(P<0.05),萌发物种数较对照(7种)依次增加2.6、2.0倍;5~10 cm土层也呈现相同的变化趋势。无论降水增加与否,0~10 cm土层伊犁绢蒿、木地肤、毛梗顶冰花均有萌发,且降水增加显著促进伊犁绢蒿、木地肤、串珠老鹳草、毛梗顶冰花的萌发。随降水量增加,0~5 cm土层伊犁绢蒿可萌发土壤种子库与地上植被Sorensen相似性总体呈先增后降趋势,且降水增加≥20%处理相似性高于降水增加≤15%处理。降水增加后伊犁绢蒿荒漠土壤种子萌发物种的Shannon-Wiener指数、Pielou指数、Patrick指数总体呈增加趋势,且0~5 cm土层较5~10 cm土层增加明显。土壤种子库可萌发种子密度具明显的空间异质性,且受空间取样位置及降水的交互影响。综上所述,降水增加促进了伊犁绢蒿荒漠草地土壤种子库可萌发植物种数、种子萌发密度、植物多样性指数的增加,导致其与地上植被的相似性增加,有利于退化蒿类荒漠草地的恢复。
英文摘要	In this study,plots of six different precipitation regimes[natural conditions,CK;and artificially simulated precipitation increases of 5% (W_5),10% (W_(10)),15% (W_(15)),20% (W_(20))and 25% (W_(25))]were established in moderately degraded Seriphidium transiliense desert grassland in order to study the effects of increasing precipitation on the seed density in the soil seed bank and on numbers of plant species represented.It was found that the number of species with germinated seedlings,and the seed numbers in the soil seed bank in the 0-5 cm soil layer increased gradually with increasing precipitation,with the germinated-seedling density of W_(20) and W_(25) being significantly(P<0.05)higher than other treatments,and the number of species with germinated seeds increased by 2.6 times and 2.0 times respectively as compared with the CK treatment(7 species). The same pattern was also seen in the seed bank of the 5-10 cm soil layer.For all six precipitation regimes,S. transiliense,Kochia prostrata and Gagea albertii all germinated in soil from the 0-10 cm soil layer,and precipitation increase significantly promoted the seed numbers germinated of S.transiliense,K.prostrata,Geranium transversale and Geranium albertii.With increasing precipitation,the Sorensen similarity between species germinating from the soil seed bank in the 0-5 cm soil layer and aboveground vegetation increased first and then decreased in S.transiliense desert grassland,and the Sorensen similarity of species composition of aboveground vegetation under W_(20) and W_(25) treatment was higher than other treatments.The Shannon-Wiener index,Pielou index and Patrick index of the number of species represented in the seedbank in S.transiliense desert grassland showed an increasing trend after precipitation enhancement,and the increase in the 0-5 cm soil layer was more obvious than that in the 5-10 cm soil layer.The germinated seed density in soil seed bank had obvious spatial heterogeneity,and was affected by the interaction of spatial sampling locations and precipitation. In summary,precipitation enhancement increased the number of germinating plant species,the density of seeds germinating,and the plant diversity index in the soil seed bank of the S.transiliense desert grassland studied.This in turn increased the similarity in species composition between the aboveground vegetation and the seedbank and was beneficial to the restoration of degraded sagebrush desert grassland.
中文关键词	降水增加 ; 蒿类荒漠草地 ; 土壤种子库 ; 植物多样性 ; 群落相似性
英文关键词	increasing precipitation Artemisia desert grassland soil seed bank plant diversity community similarity
语种	中文
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6633258
来源机构	新疆农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315955
作者单位	1.新疆农业大学草业与环境科学学院, 乌鲁木齐, 新疆 830052, 中国; 2.新疆农业大学草业与环境科学学院;;西部干旱荒漠区草地资源与生态教育部重点实验室;;新疆草地资源与生态重点实验室, ;;西部干旱荒漠区草地资源与生态教育部重点实验室;;新疆草地资源与生态重点实验室, 乌鲁木齐;;乌鲁木齐;;乌鲁木齐, 新疆;;新疆;;新疆 830052;;830052;;830052, 中国
推荐引用方式 GB/T 7714	田梦,孙宗玖,李莹,等. 蒿类荒漠草地土壤种子库特征及其萌发植物多样性对降水增加的响应[J]. 新疆农业大学,2019,28(12):17-28.
APA	田梦,孙宗玖,李莹,李培英,&谢开云.(2019).蒿类荒漠草地土壤种子库特征及其萌发植物多样性对降水增加的响应.草业学报,28(12),17-28.
MLA	田梦,et al."蒿类荒漠草地土壤种子库特征及其萌发植物多样性对降水增加的响应".草业学报 28.12(2019):17-28.