土地利用方式对潮棕壤磷素剖面分布的影响  

Effects of Land Use on the Profile Distribution of Phosphorus in Aquic Brown Soil

作　　者：姜勇[1] 张玉革[1] 梁文举[1] 孟凡祥[1] 刘艳军[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,辽宁沈阳110016

出　　处：《农业环境科学学报》2005年第3期512-516,共5页Journal of Agro-Environment Science

基　　金：中国科学院沈阳生态实验站基金课题(SYZ0204);中国科学院知识创新工程项目(KZCX2-413)

摘　　要：采用现场采集土壤样品及室内分析测试,对中国科学院沈阳生态实验站4种土地利用方式的潮棕壤在0～150cm10个土层中全磷的垂直分布、磷储量及碳磷比进行比较研究。结果表明,不同利用方式下土体中全磷平均含量为林地>撂荒地>玉米地>水稻田,各种利用方式土壤全磷含量在0～30cm各层次差异不显著,30cm以下各层次玉米地和撂荒地差异不显著,但60cm以下各层次林地土壤全磷显著高于其他3种利用方式,表明土地利用对磷素的剖面分布产生了明显的影响。4种利用方式在20cm深度土壤磷储量差异不明显,但在100cm和150cm深度,林地和撂荒地显著高于玉米地和水稻田土壤。土壤碳磷比随剖面深度下降而降低,在40cm以下有林地和玉米地高于撂荒地和水稻田的趋势。回归分析表明,各种利用方式下土壤速效磷与全磷有较好的正相关关系,说明供试土壤中速效磷含量受全磷状况的影响较大。The dynamics of soil total phosphorus, phosphorus storage and carbon/phosphorus(C/P) ratio at the depth of 0~150 cm in aquic brown soil was studied at the Shenyang Experimental Station of Ecology, Chinese Academy of Sciences under 14 years of four land use patterns (paddy field (PF), maize field (MF), fallow field (FF, fallowed for 9 years) and woodland (WL)). The results showed that the average concentration of soil total P under different land uses was woodland> fallow field> maize field> paddy field. There was no significant difference in soil total P of 0~30 cm layers among various land uses and in layers below 30 cm between maize and fallow fields; while, in layers below 60 cm, total P was significantly higher in woodland than in any of the other three land uses, indicating the obvious effects of land use practices on the profile distribution of total P. The soil P storage at the depth of 20 cm was not significantly different among the four land uses, but it was significantly greater in woodland and fallow field than in maize and paddy fields at 100 and 150 cm depths. The C/P ratio decreased with the profile depth and tended to be greater in woodland and maize field than in fallow and paddy fields in layers below 40 cm. Soil available P was positively correlated with total P under each land use pattern, indicating that the available P was significantly affected by total P status in test soil.

关 键 词：潮棕壤 土地利用 土壤磷 土壤磷储量 剖面分布 

分 类 号：S131[农业科学—农业基础科学]