陜北水蝕風(fēng)蝕交錯(cuò)區(qū)不同植被下生物結(jié)皮的發(fā)育特征研究
本文關(guān)鍵詞:陜北水蝕風(fēng)蝕交錯(cuò)區(qū)不同植被下生物結(jié)皮的發(fā)育特征研究,由筆耕文化傳播整理發(fā)布。
西北林學(xué)院學(xué)報(bào)201l,26(4):41~46
JournalofNorthwestForestryUniversity
陜北水蝕風(fēng)蝕交錯(cuò)區(qū)不同植被下生物結(jié)皮的發(fā)育特征研究
孟
杰1,卜崇峰1’弘,張興昌1’2,孫占鋒3
(1.西北農(nóng)林科技大學(xué)資源與環(huán)境學(xué)院,陜西楊陵712100;2.中國(guó)科學(xué)院水利部水土保持研究所,陜西楊陵712100;
3.《中國(guó)水土保持》雜志社,河南鄭州450003)
摘要:研究了黃土高原典型流域內(nèi)不同植被下生物結(jié)皮的厚度、容重和抗剪強(qiáng)度等變化特征。結(jié)
果表明:不同植被下黃土生物結(jié)皮的發(fā)育程度差異較大,表現(xiàn)在結(jié)皮的厚度、抗剪強(qiáng)度和容重幾個(gè)指標(biāo)上,總體發(fā)育程度順序?yàn)椋簡(jiǎn)坦嘞陆Y(jié)皮>多年生草本下結(jié)皮>一年生草本下結(jié)皮。隨著生物結(jié)皮的發(fā)育和演替,結(jié)皮厚度增加,但增加幅度相對(duì)緩慢;結(jié)皮容重呈降低趨勢(shì),土壤孔隙結(jié)構(gòu)得以改善;結(jié)皮抗剪強(qiáng)度不斷增大,表明其控蝕效果相應(yīng)增強(qiáng)。生物結(jié)皮的覆蓋度和厚度均明顯表現(xiàn)為:陰坡>陽(yáng)坡,而容重變化則相反,即陰坡<陽(yáng)坡;抗剪強(qiáng)度表現(xiàn)為陽(yáng)坡略大于陰坡。說(shuō)明坡向?qū)ι锝Y(jié)皮的發(fā)育具有顯著影響。不同植被和坡向下生物結(jié)皮的發(fā)育特征出現(xiàn)差異,其水文生態(tài)功能理應(yīng)有所不同,這在今后的研究中應(yīng)予以重視。
關(guān)鍵詞:生物結(jié)皮;發(fā)育特征;植被類(lèi)型;坡向;水蝕風(fēng)蝕交錯(cuò)區(qū)
中圖分類(lèi)號(hào):S157
文獻(xiàn)標(biāo)志碼:A
文章編號(hào):1001—7461(2011)04—0041—06
DevelopmentalCharacteristicsofBiologicalSoilCrustunderDifferentVegetationTypes
in
Wind-water
ErosionCrisscrossRegion,NorthernShaanxiProvince,China
MENGJiel,BUChong-fen91,孫,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
收穡日期:2010—07-20修回日期:2010—09-13
基金項(xiàng)目:國(guó)家自然科學(xué)基金項(xiàng)目(40701096)l中國(guó)科學(xué)院西部之光(B28013200);陜西省自然科學(xué)基金項(xiàng)目(SJ08SD07)作者簡(jiǎn)介:孟杰,男,,在讀碩士,主要從事水土保持與環(huán)境生物資源利用方面的研究。*通訊作者:^崇峰。男,博士,副研究員。主要從事水土保持與土壤侵蝕研究。
本文關(guān)鍵詞:陜北水蝕風(fēng)蝕交錯(cuò)區(qū)不同植被下生物結(jié)皮的發(fā)育特征研究,由筆耕文化傳播整理發(fā)布。
本文編號(hào):68358
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