作 者：
张瑞红;蔡文涛;来利明;姜联合;王永吉;郑元润
关键词：
草地灌丛化;本氏针茅;油蒿;土壤质地;根系分布;群落演替;生态恢复
摘 要：
土壤理化性质的变化对植物群落的演替起着决定作用,探讨灌丛化过程中不同阶段土壤理化性质的变化规律,可为草地生态系统的恢复提供理论依据。以鄂尔多斯高原天然分布的本氏针茅(Stipa bungeana)与油蒿(Artemisia ordosica)过渡区的不同植物群落为研究对象,通过野外调查,选择本氏针茅向油蒿群落过渡过程中不同演替阶段的代表性植物群落,采用环刀法采集土壤样品,分析6个不同群落0-50cm土层土壤理化性质的变化规律。结果表明,在本氏针茅向油蒿群落过渡的过程中,1)0-50cm土层土壤质地发生显著变化(P<0.05),由砂质壤土变为砂土,土壤砂粒含量由阶段Ⅰ的77.5%上升到阶段Ⅵ的89.2%,土壤黏粒、粉粒含量分别由阶段Ⅰ的0.59%和21.9%下降到阶段Ⅵ的0.21%和10.6%;表层土壤含水量由阶段Ⅰ的6%下降到阶段Ⅵ的4%,土壤容重由阶段Ⅰ的1.58g·m~(-3)上升到阶段Ⅵ的1.77g·m~(-3);2)土壤全氮、全碳、全磷总体上呈下降趋势,0-5cm表层土壤的全氮、全碳、全磷分别从阶段I的0.08%、0.77%、0.41%下降到阶段Ⅳ的0.03%、0.25%、0.23%,土壤全钾整体上波动较大。3)土壤表层肥力下降,质量降低,水分含量降低,限制了浅根系草本植物的生长,有利于深根系的半灌木植物油蒿的入侵。在鄂尔多斯高原灌丛化草地生态系统恢复中,应注重提高表层土壤质量,促进灌丛化草地的恢复。
译 名：
Dynamics of soil physicochemical properties in shrub and grass communities in Ordos Plateau
作 者：
Zhang Rui-hong;Cai Wen-tao;Lai Li-ming;Jiang Lian-he;Wang Yong-ji;Zheng Yuan-run;College of Life Science Shanxi Normal University;Institute of Botany Chinese Academy of Sciences;
单 位：
Zhang Rui-hong%Cai Wen-tao%Lai Li-ming%Jiang Lian-he%Wang Yong-ji%Zheng Yuan-run%College of Life Science Shanxi Normal University%Institute of Botany Chinese Academy of Sciences
关键词：
shrub encroachment;;Stipa bungeana;;Artemisia ordosica;;soil texture;;root distribution;;community succession;;ecological restoration
摘 要：
Changes in soil physicochemical properties can affect plant community succession.Studies on changes in soil physicochemical properties at different stages of shrub encroachment could help restore degraded grasslands.Based on recorded data about different plant communities in the transition zone fromStipa bungeanato Artemisia ordosica,the physical and chemical properties of soil layers at 0-50 cm at six different stages were analyzed.The results showed that in the 0-50 cm soil layer from the S.bungeanato A.ordosica community:1)soil texture changed significantly from sandy loam to sandy soil(P<0.05);sand in soil gradually increased from 77.5%in stageⅠto 89.2%in stageⅥ,and clay and silt in soil decreased from 0.59%and 21.9%in stageⅠ to 0.21% and 10.6%in stageⅥ,respectively.Surface soil moisture decreased from 6%in stageⅠto 4%in stage Ⅵ,and soil bulk density increased from 1.58 g·m~(-3) in stageⅠto 1.77 g·m~(-3) in stageⅥ;2)soil levels of total nitrogen,total carbon,and total phosphorus decreased generally;levels of total nitrogen,total carbon,and total phosphorus in the 0-5 cm soil layer decreased from 0.08%,0.77%,and 0.41%in stageⅠto 0.03%,0.25%,and 0.23%in stageⅥ,respectively;soil total potassium content changed considerably;3)during the process of shrub encroachment,soil fertility,quality,and soil moisture decreased;these changes limited grass growth,and provided favorable conditions for shrub development with deep root systems.Therefore,in vegetation restoration,the quality of the surface soil layer should be improved to recover shrub-encroached grasslands.
