论文部分内容阅读
选取在西藏拉萨地区人工种植的两龄紫穗槐为研究对象,探讨了灌丛内与灌丛外土壤各种形态氮素、全磷、有机碳的含量特征及土壤pH的差异。结果表明,1)相对于灌丛外土壤,灌丛内土壤的全氮、铵态氮、硝态氮分别平均高23.44%,13.95%和37.60%,土壤全磷平均高19.57%,土壤有机碳平均高44.21%,土壤pH值平均低1.69%。2)灌丛内与灌丛外土壤的全氮、铵态氮、硝态氮、全磷、有机碳、pH均差异显著(P<0.05)。3)垂直方向上,灌丛内和灌丛外在10~20cm土层的全氮、铵态氮、硝态氮、全磷均为最高,有机碳和pH则随土层深度增加而递减。4)土壤各营养元素之间表现为不同程度的相关性,土壤有机碳与铵态氮呈极显著正相关关系(P<0.01),与全磷呈显著正相关关系(P<0.05);全氮与全磷呈极显著正相关关系(P<0.01);铵态氮与全磷呈极显著正相关关系(P<0.01)。
The two-year-old amorpha fruticosa plantation planted in Lhasa, Tibet Autonomous Region was chosen as the research object. The content of various forms of nitrogen, total phosphorus and organic carbon in soils outside the shrub and shrubs and the differences in soil pH were discussed. The results showed that: 1) Total nitrogen, ammonium nitrogen and nitrate nitrogen of soils in shrubs were 23.44%, 13.95% and 37.60% higher than those in shrubs on average, and the average total phosphorus in soils was 19.57% and that of soil organic carbon An average of 44.21% high, average soil pH value 1.69% low. 2) There was significant difference (P <0.05) in soil total nitrogen, ammonium nitrogen, nitrate nitrogen, total phosphorus, organic carbon and pH among the shrubs and shrubs. 3) In the vertical direction, the contents of total nitrogen, ammonium nitrogen, nitrate nitrogen and total phosphorus were the highest in 10-20 cm soil layer in the shrubs and shrubs while the organic carbon and pH decreased with soil depth increasing. (4) There was a significant positive correlation between soil organic matter and ammonium (P <0.01), and positively correlated with total phosphorus (P <0.05). There was a significant positive correlation between nitrogen and total phosphorus (P <0.01). There was a significant positive correlation between nitrogen and total phosphorus (P <0.01).