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1、中国农学通报2009,25(05):104-109ChineseAgriculturalScienceBulletin马尾松对喀斯特石漠化地区土壤有机质的影响1,2222覃勇荣，王燕，刘旭辉，徐金强（1中山大学生命科学学院，广州510275；2河池学院化学与生命科学系，广西宜州546300）摘要：以桂西北喀斯特地区为例，研究了石漠化生态恢复过程中，马尾松对土壤有机质含量的影响，并对坡向、海拔高度、恢复年限、植被类型等生态因子与马尾松样地土壤有机质含量的相关性进行了分析，结果表明：土壤水分含量、电导率、凋落量、纤维素分解强度等与马尾松林
2、土壤有机质含量呈正相关，凋落物有机质含量与马尾松林土壤有机质含量呈负相关。坡向对土壤有机质含量有较明显的影响，东南坡土壤有机质含量比西北坡高；在一定范围内，植被恢复时间越长，土壤有机质含量就越高；马尾松林土壤有机质含量通常随海拔的升高而有下降的趋势。但是，喀斯特地区生态环境十分脆弱，极易受到人为因素的影响。人为干扰的频度和强度不同，土壤有机质的变化规律也不同，干扰越大，有机质含量越低，土壤就越贫瘠。关键词：马尾松；土壤有机质；喀斯特石漠化；生态恢复中图分类号：S158.3文献标识码：AInfluenceofPinusmassonian
3、aonSoilOrganicMatterContentoftheKarstRockyDesertificationArea，North-westofGuangxiProvince1,2222QinYongrong,WangYan,LiuXuhui,XuJinqiang(1SchoolofLifeSciences,SunYat-senUniversity,Guangzhou510275;2DepartmentofChemistryandLifeSciences,HechiUniversity,YizhouGuangxi546300)Ab
4、stract：Thispaperismainlyontheinfluenceofsoilorganicmatter(SOM)contentofPinusmassonianaforestduringtheprocessofecologicalrestorationinkarstrockydesertificationarea,thenorthwestofGuangxi.ThecorrelationbetweenSOMoftheplotsandtheecologicalfactor,suchasaspect,altitude,recove
5、rytime,vegetationtypeswereanalyzed.ItisshowedthattheSOMofPinusmassonianawaspositivelycorrelatedtosoilmoisture,conductivity,amountoflitterandcellulosedecompositionstrength,butnegativecorrelatedtotheorganicmatteroflitter.TheinfluenceofaspectonSOMisobviously,generallyspeak
6、ing,thesoilorganicmattercontentofthesoutheastslopeismuchhigherthanthatofthenorthwestslope.Inacertainrangeoftime,thelongerofthevegetationrecovertime,thehigherofthesoilorganicmattercontent.Although,thereisadownwardtrendofSOMinPinusmassonianaforestwiththeincreaseofthealtit
7、ude.Becausetheecologicalenvironmentisveryfragile,so,itiseasyaffectedbyhumanactivity.DifferentfrequencyanddifferentintensityofhumandisturbanceresultsindifferentchangesofSOM,thestrongerofdisturbance,themuchlowerofSOM,intheend,thesoilwillbecomemorebarren.Keywords:Pinusmass
8、oniana,soilorganicmatter,KarstRockyDesertification,ecologicalrestoration基金项目：本研究得到香港嘉道理农场暨植物园提供资助，受广西自然科学基金（项目
