林地改种牧草对砖红壤物理质量性状的影响  

Effects on Latosol Physical Properties Changing Woodland to Grassland in Hainan

作　　者：赵庆辉[1] 祝飞[1] 邓万刚[1] 漆智平[2] 吴蔚东[1] 

机构地区：[1]海南大学农学院,海南海口570228 [2]中国热带农业科学院热带作物品种资源研究所,海南儋州571737

出　　处：《草地学报》2011年第3期478-481,共4页Acta Agrestia Sinica

基　　金：国家自然科学基金项目"海南热带球囊霉素相关土壤蛋白质及其对土壤结构影响"(40761024);海南大学211工程项目"热带作物遗传育种与生态保育"资助

摘　　要：选取海南5个牧草地样地,以样地附近立地条件一致的林地为对照,研究海南热带砖红壤林地改种牧草后土壤物理性状变化。结果表明：林地改种牧草后土壤平均容重降低3.91%,从1.33 g.cm-3下降到1.28 g.cm-3;砂粒含量减少15.89%,粘粒和粉粒含量分别增加17.08%和18.86%;微团聚体（53~250μm）和粉粒与粘粒大小的团聚体（〈53μm）含量分别减少57.78%和13.29%,大团聚体（〉250μm）含量增加26.28%;同时,土壤渗透性增加77.08%,10℃时渗透系数K10从平均0.96上升到1.70。尽管未能达到显著水平,但林地改种牧草后各种土壤物理性状均有一定改善。Physical properties of 5 grassland plots and their corresponding nearby woodland controls were investigated to study the effect of replanting grass in woodland on latosols in Hainan.Mean soil bulk density decreased 3.91%,from 1.33 g·cm-3 to 1.28 g·cm-3 after replanting grass in woodlands.Meanwhile,sand contents decreased 15.89% in grasslands.Clay and silt contents increased 17.08% and 18.86% in grassland,respectively.Soil macro-aggregate（250 μm） increased 6.28%,whereas soil micro-aggregate（53～250 μm） and aggregates of sand and silt（53 μm） decreased 57.78% and 13.29%,respectively.Soil permeability increased 77.08%.Mean water permeability coefficient（K10） rose from 0.96 to 1.7 at 10℃.This study indicates that replanting grass in woodlands improved all soil physical properties.

关 键 词：林地改种牧草 土壤物理质量性状 砖红壤 海南 

分 类 号：S152[农业科学—土壤学]