摘要
对四川紫色土区不同土地利用方式下土壤表层及剖面养分的分布特征及其与颗粒含量之间的关系进行了研究,结果表明:(1)林地、水田具有较高的土壤氮素和有机质(与旱地、果园、裸地均达到了显著差异),且林地剖面养分随土层深度的增加呈几何级数下降,但土壤磷素含量相对较低。(2)受施肥状况的影响,经济园林土壤磷素普遍偏高。(3)旱坡地的表层养分与底层养分含量差异不大,说明该区旱坡地土壤可能存在较大的养分流失与淋失现象,坡面径流、壤中径流携带的养分不容忽视。(4)土壤中大部分养分含量与土壤颗粒含量之间有一定的相关性,其中土壤全氮、碱解氮与粉粒(0.002～0.02mm)含量之间呈显著的正相关,与砂粒(0.02～2mm)含量之间呈极显著的负相关;土壤有机质与粉粒含量之间呈极显著的正相关,与砂粒含量之间呈极显著的负相关;而土壤全磷情况正好相反,与粉粒含量呈现极显著的负相关,与砂粒含量呈现极显著的正相关;只有碱解氮与粘粒(<0.002mm)含量之间的相关性达到了5%显著水平。
Distribution of soil nutrient content and relationship between soil nutrient and soil granule composition for the small watershed on the purple area in Sichuan were studied. The results were as follows: (1) For nitrogen and organic matter, the contents of woodland and paddy field were the higher, which had the significant difference from other land use types (at 95% level), and the profile nutrients of woodland decreased with geometric series as the depth of soil increased, but the phosphorus of woodland were the lowest. (2) For phosphorus, the contents of orchard were the higher due to the effect of fertilizers. (3) There was little difference between surface nutrients and nutrients of bottom soil for dry land on the slope, which indicated that it was possible that potential nutrients were lost and leaching. We shouldnt neglect that the amount of surface flow or base flow was higher. (4) There existed significant relationship between most nutrients in soil and various soil granule contents. Soil total nitrogen and available nitrogen were positively corrected with soil silt (0.002~0.02mm) contents, but highly negatively correlated with soil sand (0.02～2 mm) contents. Soil organic matter was highly positively corrected with soil silt (0.002～0.02 mm) contents, but highly negatively correlated with soil sand (0.02～2 mm) contents. For total phosphorus, the contrary condition was found. There only existed significant relationship between available nitrogen and soil clay (<0.002mm) contents at 95% level.
出处
《水土保持学报》
CSCD
北大核心
2003年第2期44-46,50,共4页
Journal of Soil and Water Conservation
基金
欧盟项目(ERBIC18CT98037)
国家重点基础研究规划项目(G1999011810)
南京土壤研究所所长基金资助(005102)
