摘要
对广西红壤上的柑桔、荔枝、龙眼和芒果的4种果园土壤环境状况进行调查,并与1980年广西第二次土壤普查资料比较发现,红壤果园土壤环境恶化:土壤酸性很强,pH值平均只有4 83;土壤pH值在5 5以下的酸性、强酸性果园占83%,其中pH<4 5的强酸性果园占样本总数的34%,比1980年增加19个百分点。果园土壤普遍酸化。4种果园中,土壤pH下降最大的是柑桔园,下降了0 95个单位,龙眼园、荔枝园和芒果园分别下降0 89、0 70和0 64个单位;3种母质中,第四纪红土母质果园土壤pH值下降达1个单位,花岗岩母质和砂页岩母质果园土壤pH值依次为0 88和0 54个单位。与1980年比,广西不同地区土壤酸化顺序为(严重轻):桂南>桂北>桂中>桂东>桂西。果园土壤酸化的主要原因是果园施肥管理不善,加上广西温度高雨量大造成严重水土流失所引起。根据果园土壤现状,提出了防止土壤酸化的相应措施。
Four kinds of orchard (Orange, Litchi,Longan and Mango)soil environment status in red earth region of Guangxi province were investigated,and compared with data of 2nd soil survey. Results showed that orchard soil environment in red earth region of Guangxi deteriorated.Orchard soil acidity of Guangxi were getting stronger with only 4.83 of average pH value,and acidic and strong acidic orchard with less than 5.5 of pH value accounted for 83% of the total.Specially,the strong acidic orchard with less than 4.5 of pH value accounted for 34% of the total sample number with the increase of 19 percentage compared with that of 1980 year. The orchard soil of Guangxi acidified generally. Among four kinds of orchard,soil pH value of the Orange orchard dropped most with the decrease of 0.95 unit,and that of the Litchi,the Longan and the Mango dropped 0.89,0.70 and 0.64 unit, respectively.Among three kinds of parent material,the soil pH value of Quaternary red soil dropped one unit,the soil pH value of Granite and Sand shale dropped 0.88 and 0.54,respectively.The acidification order(from serious to light)of orchard soil in various regions of Guangxi province were GX south>GX north>GX middle>GX east>GX west,compared with that of 1980 year.The factors that led to orchard soil acidification were mainly:disequilibrium of fertilization,bad orchard management,soil erosion due to high temperature and rainfall of Guangxi province.At the same time,some measures were suggested to prevent orchard soil acidification.
出处
《西南农业学报》
CSCD
2003年第4期90-94,共5页
Southwest China Journal of Agricultural Sciences
基金
广西自然科学基金项目(桂科自0007003)
