黄土高原小叶杨人工林土壤碳氮分布特征  

Distribution of Soil Carbon and Nitrogen in Populus simonii Plantations in Loess Plateau

作　　者：刘栋[1,2] 

机构地区：[1]重庆水利电力职业技术学院,重庆402160 [2]西北农林科技大学水土保持研究所,陕西杨陵712100

出　　处：《西北林学院学报》2015年第6期8-14,21,共8页Journal of Northwest Forestry University

基　　金：重庆市教育委员会科学技术研究项目(KJ1403602);重庆市基础与前沿研究计划项目(cstc2014jcyjA20009)

摘　　要：以黄土高原西部典型小叶杨人工林地土壤为研究对象,通过比较研究区内不同土层中的土壤及其团聚体有机碳氮的含量和储量,分析并探讨了土壤有机碳氮的分布及其随土壤团聚体的变化特征。结果表明：1）、黄土高原西部地区小叶杨林土壤团聚体的分布受土壤质地影响,壤土以〈0.053mm团聚体为主,而砂土以0.250-0.053mm团聚体为主;2）、研究区内小叶杨人工林下表层土壤碳氮含量高于底层土壤,且壤土差异较砂土更为明显,且含量也高于砂土;3）、土壤质地影响土壤中碳氮元素随团聚体的分布：壤土有机碳氮的分布取决于各团聚体有机碳氮的分布特征,而砂土有机碳氮的含量取决于〈0.053mm团聚体的有机碳氮含量,有机碳氮的储量则取决于0.25-0.053mm团聚体的有机碳氮储量。Distribution patterns and the variations of soil organic carbon and nitrogen in soil aggregates of Populus simonii plantations were examined through the comparison of the contents and reserves of organic carbon and nitrogen in soils and aggregates in different soil layers of the plantations in Loess Plateau of western China. The results showed that, 1） The distribution of soil aggregate was affected by soil texture, the soil aggregate was primary less than 0. 053 mm in loam soil and between 0. 250 and 0. 053 in sandy soil; 2） The carbon and nitrogen reserves in the surface layer were higher than the low layer, and the variation and storage in loam soil were higher than sandy soil;3） The distribution of carbon and nitrogen in soil ag gregate was affected by soil texture： it was determined by all the aggregates in loamy soil. In sandy soil, however, the soil organic C and N contents were determined by those in 〈0.053 mm aggregates, while C and N reserves were by 0. 250-0. 053 mm aggregates.

关 键 词：土壤团聚体 土壤有机碳 土壤全氮 黄土高原 

分 类 号：S714.2[农业科学—林学]