陕北水蚀风蚀交错区不同植被下生物结皮的发育特征研究
本文关键词:陕北水蚀风蚀交错区不同植被下生物结皮的发育特征研究,由笔耕文化传播整理发布。
西北林学院学报201l,26(4):41~46
JournalofNorthwestForestryUniversity
陕北水蚀风蚀交错区不同植被下生物结皮的发育特征研究
孟
杰1,卜崇峰1’弘,张兴昌1’2,孙占锋3
(1.西北农林科技大学资源与环境学院,陕西杨陵712100;2.中国科学院水利部水土保持研究所,陕西杨陵712100;
3.《中国水土保持》杂志社,河南郑州450003)
摘要:研究了黄土高原典型流域内不同植被下生物结皮的厚度、容重和抗剪强度等变化特征。结
果表明:不同植被下黄土生物结皮的发育程度差异较大,表现在结皮的厚度、抗剪强度和容重几个指标上,总体发育程度顺序为:乔灌下结皮>多年生草本下结皮>一年生草本下结皮。随着生物结皮的发育和演替,结皮厚度增加,但增加幅度相对缓慢;结皮容重呈降低趋势,土壤孔隙结构得以改善;结皮抗剪强度不断增大,表明其控蚀效果相应增强。生物结皮的覆盖度和厚度均明显表现为:阴坡>阳坡,而容重变化则相反,即阴坡<阳坡;抗剪强度表现为阳坡略大于阴坡。说明坡向对生物结皮的发育具有显著影响。不同植被和坡向下生物结皮的发育特征出现差异,其水文生态功能理应有所不同,这在今后的研究中应予以重视。
关键词:生物结皮;发育特征;植被类型;坡向;水蚀风蚀交错区
中图分类号:S157
文献标志码:A
文章编号:1001—7461(2011)04—0041—06
DevelopmentalCharacteristicsofBiologicalSoilCrustunderDifferentVegetationTypes
in
Wind-water
ErosionCrisscrossRegion,NorthernShaanxiProvince,China
MENGJiel,BUChong-fen91,孙,ZHANGXing-chan91一,SUNZhan-fen93
(1.CollegeofResourcesandEnvironment,NorthzvestA&F
2.Institute
University,Yangling,Shaanxi712100,China;Sciencesand
ofSoil
andWater
Conservation,ChineseAcademyof
MinistryofWater
Resources,Yangling
Shaanxi712100,China;3.Soiland
Water
ConservationinChina
Press,Zhengzhou,Henan,450003)
Abstract:Biologicalsollcrusts(BSC)arecommonfeatures
on
sollsurfaceinaridandsemiaridregions,and
to
playsignificantbiologicalrolesintheseecosystems.Inorderdeterminethedevelopmentalcharacteris—
on
ticsofBSCinLiudaogouwatershedinthewind—watererosioncrisscrossregion
theLoessPlateauof
China,thethickness,shearstrength,andthebulkdensityoftheBSCunderdifferentvegetationtypesandindifferentslopeaspectsweremeasuredandtakenindicatedthat:there
as
evaluationindicesof
crust's
development.Theresults
weregreatdifferencesamongthesepropertiesofBSCunderdifferentvegetation
types,andthedevelopmentdegreesofBSCgenerallyfollowedtheorderofthearborandshrubvegetation
>perennialherbaceousplants>annualherbaceousplantsinresearcharea.Withthedevelopmentand
cessionofBSC,thecrusfsthicknessincreasedgradually,buttheincreasing
extent
SUC—
wasveryslow.Mean—
while,thebulkdensityofBSCnotablydecreasedwiththeincreaseofcrusfsthickness,whiletheporosityand
structure
ofsoilwasimproved.TheshearstrengthandthicknessofBSCshowedobviouslypositive
收穑日期:2010—07-20修回日期:2010—09-13
基金项目:国家自然科学基金项目(40701096)l中国科学院西部之光(B28013200);陕西省自然科学基金项目(SJ08SD07)作者简介:孟杰,男,,在读硕士,主要从事水土保持与环境生物资源利用方面的研究。*通讯作者:^崇峰。男,博士,副研究员。主要从事水土保持与土壤侵蚀研究。
本文关键词:陕北水蚀风蚀交错区不同植被下生物结皮的发育特征研究,由笔耕文化传播整理发布。
本文编号:68358
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