植被对黄土高原沟壑区坡地土壤有机碳的影响  

Effect of Vegetation on Soil Organic Carbon of Slope Land in Gully Region of Loess Plateau

作　　者：刘守赞[1,2] 郭胜利[2,3] 王小利[2,3] 薛宝民[4] 

机构地区：[1]浙江林学院生命科学学院 [2]中国科学院,水利部水土保持研究所 [3]西北农林科技大学水土保持研究所,陕西杨凌712100 [4]河北农业大学资源与环境科学学院

出　　处：《自然资源学报》2005年第4期529-536,共8页Journal of Natural Resources

基　　金：中科院西部之光项目;中国科学院知识创新重要方向项目"黄土高原水土保持的区域环境效应"(KZCX3-SW-421);陕西省自然科学基金"小流域土壤质量性状对土地利用方式变化的响应"项目资助。

摘　　要：选取高原沟壑区王东沟流域内典型的治理坡段,研究不同植被条件下土壤有机碳、氮的含量变化和坡面分布特征。结果表明:与荒草(白羊草)群落相比,油松群落条件下,土壤有机碳含量提高9.3%(P>0.05),而果园土壤有机碳含量降低40.1%(P<0.05)。沙棘、侧柏和刺槐群落下,土壤有机碳含量虽低于荒草群落,但尚未达到显著水平(P>0.05)。果园和刺槐群落下坡面有机碳变化趋势不明显;杏树群落下表现为坡中部含量高,上部和下部低;白羊草群落下坡面有机碳含量从上到下逐渐增加。不同植被条件下土壤全氮与土壤有机碳存在极显著(R2=0.925)的相关关系。Vegetation recovery is an important measure to mitigate soil erosion and improve soil quality in the Loess Plateau.To understand the impact of vegetation recovery on soil quality,soil organic carbon (SOC) and total soil nitrogen(TSN)level and distribution characteristics along a slope under vegetation conditions were investigated on slope of Wangdonggou Watershed in Gully Region of Loess Plateau.Five experiment sites were set up along Fanjialiang.Site I to site Ⅳ along the eastern slope of Fanjialiang was Xingniugua,Dujiaping,Baiyanggua east and Bai-yanggua west,being adjacent to each other with similar slope and aspect.The vegetations were Prunus armeniaca L,orchard(Malus pumila),Robinia pseudoanacia and grass(Bothriochloaischaem- um(L.)Keng),respectively.Soil samples(0～20cm)at each site were taken from the upper slope,middle slope,lower slope and the foot slope,respectively.Site V at the western slope of Fanjialiang was Shaozhongwan with six vegetation types including Robinia pseudoanacia,arborvitae(Platycl- adus orientalis Endl.)?Chinese pine(P. tabulaeformis Carr),Hippophae rhamnoides L. subsp,Malus pumila and grass.Soil samples(0～60cm)were taken under vegetations.Types,population,and height of plants of each site were surveyed. The results demonstrated that compared with grassland,SOC content increased by 9.3%(P>0.05)for Chinese pine and decreased by 40.1%(P<0.05)for orchard.SOC content under Hippophae rhamnoides L.subsp.,arborvitae,and Robinia pseudoanacia was lower than that of grassland,but the difference was not significant(P>0.05).The level of SOC decreased with depth.For the site under grass,the content of SOC at lower slope and foot slope was respectively 47.6% and 62.9% higher than that at the upper slope with 7.8g·kg-1.For the site of orchard,SOC content was 6.17g·kg-1～6.69g·kg-1 at the middle and foot slope,higher than that at the upper (5.54g·kg-1).For the site of Robinia pseudoanacia,content of SOC varied from 8.55 to 10.50g·kg-1,similar SOC along slope changes under orchard and Robi

关 键 词：黄土沟壑区 坡地 土壤有机碳 植被类型 

分 类 号：S153.6[农业科学—土壤学]