生态学报
生態學報
생태학보
ACTA ECOLOGICA SINICA
2009年
7期
3759-3767
,共9页
任伟%周志宇%詹媛媛%薛梓瑜
任偉%週誌宇%詹媛媛%薛梓瑜
임위%주지우%첨원원%설재유
旱生灌木%根际效应%中量元素%微量元素
旱生灌木%根際效應%中量元素%微量元素
한생관목%근제효응%중량원소%미량원소
desert shrub%rhizosphere effect%medium elements%trace elements
探讨了阿拉善干旱荒漠区霸王、白刺、红砂、沙冬青、沙木蓼、梭梭和驼绒藜7种旱生灌木根际与非根际土壤Ca、Mg、Fe、Mn、Zn、Cu的含量特征.结果表明:(1)除梭梭根际pH值高于非根际之外,其余6种灌木根际土壤均表现出不同程度的酸化作用.(2)7种灌木根际全钙和交换性钙的含量均低于非根际.除沙木蓼和驼绒藜外,其余5种灌木根际全镁含量均高于非根际,白刺的富集率最高,为43.04%;除沙木蓼外,其余灌木根际交换性镁的含量均有所富集,梭梭的富集率最高,为26.52%.(3)7种灌木根际全铁、全锰、全锌含量总体上小于非根际,但是根际有效铁、有效锰、有效锌含量均大于非根际,表现出明显的富集效应,沙木蓼根际有效铁、有效锰、有效锌的富集率最高,分别为:29.76%、20.92%、86.99%.(4)沙木蓼根际全铜和有效铜含量略高于非根际.梭梭根际全铜含量低于非根际,但梭梭根际有效铜含量却有富集的趋势.其余五种灌木根际全铜和有效铜含量均低于非根际.(5)根际及非根际土壤各养分性状之间,存在复杂的相关性.
探討瞭阿拉善榦旱荒漠區霸王、白刺、紅砂、沙鼕青、沙木蓼、梭梭和駝絨藜7種旱生灌木根際與非根際土壤Ca、Mg、Fe、Mn、Zn、Cu的含量特徵.結果錶明:(1)除梭梭根際pH值高于非根際之外,其餘6種灌木根際土壤均錶現齣不同程度的痠化作用.(2)7種灌木根際全鈣和交換性鈣的含量均低于非根際.除沙木蓼和駝絨藜外,其餘5種灌木根際全鎂含量均高于非根際,白刺的富集率最高,為43.04%;除沙木蓼外,其餘灌木根際交換性鎂的含量均有所富集,梭梭的富集率最高,為26.52%.(3)7種灌木根際全鐵、全錳、全鋅含量總體上小于非根際,但是根際有效鐵、有效錳、有效鋅含量均大于非根際,錶現齣明顯的富集效應,沙木蓼根際有效鐵、有效錳、有效鋅的富集率最高,分彆為:29.76%、20.92%、86.99%.(4)沙木蓼根際全銅和有效銅含量略高于非根際.梭梭根際全銅含量低于非根際,但梭梭根際有效銅含量卻有富集的趨勢.其餘五種灌木根際全銅和有效銅含量均低于非根際.(5)根際及非根際土壤各養分性狀之間,存在複雜的相關性.
탐토료아랍선간한황막구패왕、백자、홍사、사동청、사목료、사사화타융려7충한생관목근제여비근제토양Ca、Mg、Fe、Mn、Zn、Cu적함량특정.결과표명:(1)제사사근제pH치고우비근제지외,기여6충관목근제토양균표현출불동정도적산화작용.(2)7충관목근제전개화교환성개적함량균저우비근제.제사목료화타융려외,기여5충관목근제전미함량균고우비근제,백자적부집솔최고,위43.04%;제사목료외,기여관목근제교환성미적함량균유소부집,사사적부집솔최고,위26.52%.(3)7충관목근제전철、전맹、전자함량총체상소우비근제,단시근제유효철、유효맹、유효자함량균대우비근제,표현출명현적부집효응,사목료근제유효철、유효맹、유효자적부집솔최고,분별위:29.76%、20.92%、86.99%.(4)사목료근제전동화유효동함량략고우비근제.사사근제전동함량저우비근제,단사사근제유효동함량각유부집적추세.기여오충관목근제전동화유효동함량균저우비근제.(5)근제급비근제토양각양분성상지간,존재복잡적상관성.
The characteristics of Ca、Mg、Fe、Mn、Zn and Cu concentrations in the rhizosphere and the rhizosphere-surrounded bulk soil of the 7 desert shrubs (i.e. Zygophyllum xanthoxylum, Nitraria tangutorum, Reaumuria soongorica, Ammopiptanthus mongolicu, Atraphaxia bracteata, Haloxylon ammodendron, Ceratoides lateens) in Alxa were investigated. The results revealed as follows. (1) Although pH value in the Haloxylon ammodendron rhizosphere was higher than that of the bulk soil, the other six shrubs showed varying degrees of acidification in the rhizosphere soil. (2) Contents of the total Ca and exchangeable Ca in the rhizosphere of all the seven shrubs were lower than those of the bulk soils. The total Mg content was higher in the rhizosphere than in the bulk soil for all shrubs except Atraphaxia bracteata and Ceratoides lateens, and the highest enrichment rate occurred in Nitraria tangutorum (43.1%).The exchangeable Mg content was significantly accumulated in the rhizosphere except for Atraphaxia bracteata, with Haloxylon ammodendron having the highest enrichment rate of 26.5%. (3) Overall, the contents of total Fe、Mn and Zn in the rhizosphere were lower than those of the bulk soil, but there was a significant rhizosphere effect on the contents of available Fe、Mn and Zn whose enrichment rates in the rhizosphere of Atraphaxia bracteata were 29.8%、20.9% and 86.9%, respectively. (4) Contents of the total Cu and available Cu in the Atraphaxia bracteata rhizosphere were slightly higher than in the bulk soil. The content of total Cu in the Haloxylon ammodendron rhizosphere decreased, but the content of available Cu in its rhizosphere increased. Contents of the total Cu and available Cu in the rhizosphere for the other shrubs were lower than those in the bulk soil. (5)There was a complicated correlation between soil nutrients in the rhizosphere and the bulk soil.