干旱区生态环境知识资源中心(Arid): 荒漠盐生植物根际系统盐分分布特征

Arid

	荒漠盐生植物根际系统盐分分布特征
其他题名	Salt distribution patterns in rhizosphere system of desert halophytes
	弋良朋 1; 马健 2; 李彦2
ISSN	1000-4890
出版年	2009
卷号	28 期号:5 页码:827-832
中文摘要	利用盐土和棉田土,采用水平根垫法对4种不同类型的荒漠盐生植物进行栽培实验,应用冰冻薄层切片法对距根表不同距离的土壤进行分层取样,并测定不同层次土壤中pH、总盐、Cl~-、SO_4~(2-)、Na~+、K~+、Ca~(2+)和Mg~(2+)的含量.结果表明: 在盐土中,距根表不同距离的土壤中,pH值呈有规律的梯度分布,即根际微区pH值较土体下降,且距根表越近,pH值越低;而在棉田土中却没有显著变化;总盐在根际出现较大的亏缺区,最大亏缺率位于距根表0～4 mm处;在盐土中,除芦苇外,其余3种盐生植物的根际土中Cl~-、SO_4~(2-)、Na~+、K~+、和Mg~(2+)的含量在根际有明显的富集;在棉田土中,除K+外,这些离子在根际也有富集,但富集程度比盐土低,K+表现亏缺,而Ca~(2+)却是富集的;4种植物尤其是稀盐盐生植物和泌盐盐生植物,地上部分的主要盐离子(如Cl~-、Na~+、Ca~(2+)和K~+)含量比地下部分高,在根际富集程度最高的Cl~-和Na~+,在植株的地上部分也增加的最多.
英文摘要	With saline soil and non-saline soil (cotton soil) as test soils, four types of desert hal-ophytes were planted in pots by using horizontal root-mat method. Stratified soil samples at differ-ent distance from rhizoplane were collected by slicing the frozen thin soil layer, and their pH val-ue and the contents of total salt, Cl~- , SO_4~(2-), Na~+ , K~+ , Ca~(2+) and Mg~(2+) were determined. The results indicated that in saline soils, the pH value at different distance from rhizoplane presented a regular gradient distribution, i. e. , the nearer the distance from the rhizoplane, the lower the pH was; while in cotton soil, the pH had no significant variation. There was a relatively great salt-deficit area in rhizosphere, with the highest deficit rate appeared at 0-4 mm from rhizoplane. In saline soil, an enrichment of Cl~-, SO_4~(2-) , Na~+ , K~+ and Mg~(2+) was observed in the rhizo-sphere of all test plants except Phragmites communis; and in cotton soil, the ions except K~+ also showed a high concentration in rhizosphere, but lower than that in saline soil. Additionally, in cotton soil, K~+ was in deficit, while Ca~(2+) was rich. All test plants, especially succulent halo-phytes and salt-secreting halophytes, had higher contents of Cl~- , Na~ + , Ca~(2+) and K~+ in their aboveground part than in their underground part. Cl~- and Na~+ had the highest content in rhizo-sphere , and showed the largest accumulation in aboveground part of plants.
中文关键词	根际 ; 盐生植物 ; 荒漠 ; 盐分
英文关键词	rhizosphere halophyte desert salt
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:3624700
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/224098
作者单位	1.天津师范大学城市与环境科学学院, 天津 300387, 中国; 2.中国科学院新疆生态与地理研究所, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	弋良朋,马健,李彦. 荒漠盐生植物根际系统盐分分布特征[J]. 中国科学院新疆生态与地理研究所,2009,28(5):827-832.
APA	弋良朋,马健,&李彦.(2009).荒漠盐生植物根际系统盐分分布特征.,28(5),827-832.
MLA	弋良朋,et al."荒漠盐生植物根际系统盐分分布特征".28.5(2009):827-832.