作　　者： ; ;

机构地区： 嘉应学院地理科学与旅游学院

出　　处： 《水土保持研究》 2010年第4期134-138,共5页

摘　　要： 基于野外调查、取样和室内实验分析,研究了粤东北不同土地利用方式下紫色土团聚体组成及其结构特性变化。结果表明:(1)各土地利用类型紫色土表层风干团聚体分布以>5mm粒径为主,>0.25mm团聚体含量均大于91%。湿筛后各土层>0.25mm水稳性团聚体含量明显减少,平均为54.36%,土地利用方式对紫色土水稳性团聚体影响较大。(2)表土层>0.25mm湿筛团聚体含量顺序为:林地>果园>茶园>撂荒地>旱地,>5mm团聚体水稳性与有机质和黏粒含量成正相关。各利用类型团聚体破坏率介于31.12%～47.60%,表现为旱地>撂荒地>茶园>果园>林地。(3)5种土地利用类型各土层团聚体平均重量直径(MWD)平均值为2.26mm,除旱地外,其他利用类型土壤团聚体MWD均随土壤深度增加而逐渐减少。各土层总孔隙度介于38.20%～45.28%,表层非毛管孔隙度表现为:林地>沙田柚果园>茶园>撂荒地>旱地,底层土壤亦有类似变化规律。 Using the research method of field investigation,soil sampling and laboratory analysis,the aggregate composition and structural properties of purple soils under different land use in Northeast Guangdong have been studied.The results show that：（1）Under the condition of dry sieve,purple soil aggregates in surface layer were dominated by5mm particle size,0.25mm aggregates were more than 91%.Under wet sieve,0.25mm aggregates decreased obviously,and their mean value is 54.36%,the land use pattern has greater impact on water-stable aggregates.（2）0.25mm water-stable aggregates in surface layer all changed in the following order：woodlandorchard landtea plantationabandoned fielddry farm land,and the water-stability of aggregates or content of water-stable aggregates was positively correlated with the contents of soil organic matter.The ratio of structure damage under different land use ranged from 31.12% ～47.60%,and changed in the following order：dry farm landabandoned fieldtea plantationorchard landwoodland.（3）The mean value of aggregates MWD was 2.26mm,and the aggregate MWD of all types of land,except dry farm land,decreased with depth.The total porosity ranged from 38.20%～ 45.28%,and non-capillary porosity is in surface layer in the following order：woodlandorchard landtea plantationabandoned fielddry farm land,with the similar changes in the deeper soil layer.

关 键 词： 土地利用 土壤团聚体 土壤结构特性 紫色土 粤东北

领　　域： [经济管理] [农业科学] [农业科学]