摘要
[目的]揭示荒漠灌丛对生物土壤结皮下土壤养分的影响,为干旱沙区荒漠生态系统的修复与管理提供理论基础和科学依据。[方法]采集腾格里沙漠东南缘红卫天然植被区的无灌丛生物土壤结皮(对照地)和白滨藜、柠条、狭叶锦鸡儿、油蒿4种典型灌丛+生物土壤结皮下0—10 cm,10—20 cm和20—30 cm土样,分别测定土壤有机质(SOM)、含水量(SWC)、pH值、全氮(TN)、速效氮(AN)、全磷(TP)、速效磷(AP)、全钾(TK)、速效钾(AK)的含量,通过土壤养分变化表征灌丛与生物土壤结皮互作对荒漠区土壤质量的影响。[结果](1)相较于对照地,灌丛与生物土壤结皮互作影响土壤养分,提高土壤TN,TK,AK,AN,SOM,AP和藻-地衣结皮TP含量,降低藓类结皮TP含量。(2)土层深度变化、灌丛和结皮类型对土壤养分有显著影响,每二者交互都对TP影响不显著,三者间交互除AN和AP外,对其余养分指标都有显著影响(p<0.05)。(3)同土层灌丛+藓类结皮下土壤TN,TP,AK,SOM的含量高于灌丛+藻-地衣结皮。(4)4种灌丛+生物土壤结皮下土壤养分富集于0—10 cm土层,表聚效应明显,灌丛、生物土壤结皮和土层深度三者间互作对土壤养分的富集能力有差异性。[结论]灌丛与生物土壤结皮互作能增加土壤肥力,改良土壤质量,对维持稳定的荒漠生态系统有重要作用。
[Objective]The purposes of this study are to reveal the effect of desert shrubs on soil nutrients under biocrusts,and to provide theoretical basis and scientific basis for the restoration and management of desert ecosystem in arid sandy area.[Methods]Soil samples were collected from 0—10 cm,10—20 cm and 20—30 cm soil layers under non-shrubs biocrusts(control)and biocrusts of four typical shrubs(Atriplex canescens,Caragana korshinskii,Caragana stenophylla and Artemisia ordosica)in Hongwei natural vegetation sand-fixing area in the southeastern margin of Tengger Desert.The contents of soil organic matter(SOM),water content(SWC),pH value,total nitrogen(TN),available nitrogen(AN),total phosphorus(TP),available phosphorus(AP),total potassium(TK)and available potassium(AK)were measured respectively.The effect of interaction between shrubs and biocrusts on soil quality in desert area were characterized by soil nutrient change.[Results](1)Compared with the control plot,the interaction between shrubs and biocrusts affected soil nutrients,increased soil TN,TK,AK,AN,SOM,AP and cyanobacteria-lichen crust TP content,and reduced moss crust TP content.(2)Soil depth change,shrubs and biocrusts type had significant effects on soil nutrients,and the interaction between each two had no significant effect on TP.Except for AN and AP,the interaction between the three had significant effects on other nutrient indexes(p<0.05).(3)In the same soil layer,the contents of SOM,TN,TP and AK in the soil under the shrubs+moss crust were higher than those under the shrubs+cyanobacteria-lichen crust.(4)The soil nutrients under the four shrubs+biocrusts were enriched in the 0—10 cm soil layer,and the surface accumulation effect was obvious.The interaction between shrubs,biocrusts and soil depth had different enrichment ability for soil nutrients.[Conclusion]The interaction between shrubs and biocrusts can increase soil fertility,improve soil quality,and play an important role in maintaining a stable desert ecosystem.
作者
安乐
何静
刘艳梅
索凯
赵紫娟
王凯亮
An Le;He Jing;Liu Yanmei;Suo Kai;Zhao Zijuan;Wang Kailiang(College of Forestry,Gansu Agricultural University,Lanzhou 730000,China;Gansu Forestry Voctech University,Tianshui,Gansu 741020,China;Tianshui Normal University,Tianshui,Gansu 741000,China;Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《水土保持研究》
北大核心
2025年第2期83-90,共8页
Research of Soil and Water Conservation
基金
甘肃省自然科学基金(21JR7RE177)
甘肃省科技计划项目(23JRZE511)。
作者简介
第一作者:安乐(1979-),女,甘肃秦安人,硕士,教授,主要从事林业生态研究。E-mail:807984349@qq.com;通信作者:何静(1979-),女(满族),辽宁本溪人,博士,教授,主要从事经济林病害生物防治研究。E-mail:864798021@qq.com。
