摘要
为研究不同土地利用类型下土壤养分特征及碳(C)、氮(N)、磷(P)、钾(K)的生态化学计量比,采用文献计量法对全国范围内不同土地利用类型的土壤养分指标进行研究,分析水田、旱地、草地、林地土壤养分在表层(0~20 cm)的分布情况及差异性。结果表明,4种土地利用类型下土壤全钾及速效钾含量相对较为丰富,而土壤全磷含量普遍缺乏,两者达到了显著性差异(P<0.05)。土壤全氮与全磷呈正显著性相关(P<0.05),与有效磷呈负显著性相关(P<0.05),土壤有机质与全氮表现出极显著的正相关关系(P<0.01),土壤全磷与全钾呈极显著的正相关关系(P<0.01)。土壤C:N值以水田最高,土壤C:K值、C:P值和N:K值均表现为草地最高,N:P值以林地最大,P:K值以旱地最高。根据土壤养分库综合指数推断4种不同土地利用类型的整体土壤养分水平,表现为水田>草地>旱地>林地。4种不同土地利用类型充分体现了土壤养分含量和元素的生态化学计量比的差异,可为不同土地利用类型的植被恢复和土壤改良提供理论支撑。
To study the characteristics of soil nutrients and the ecological stoichiometric ratios of carbon(C),nitrogen(N),phosphorus(P)and potassium(K)under different land use types,the distribution of soil nutrients in the surface layer(0-20 cm)of paddy fields,drylands,grasslands and woodlands and the differences were analyzed by bibliometric methods.The results showed that the four land use types were relatively rich in total potassium and fast-acting potassium,but generally deficient in total phosphorus,with significant differences(P<0.05);soil total nitrogen was positively significantly correlated with total phosphorus(P<0.05),and negatively significantly correlated with adequate phosphorus(P<0.05),soil organic matter showed a highly significant positive correlation with total nitrogen(P<0.01),and total soil phosphorus showed a highly significant positive correlation with total potassium(P<0.01).Soil C:N values were highest in paddy fields,soil C:K,C:P and N:K values were highest in grasslands,N:P values were highest in woodlands and P:K values were highest in drylands;based on the integrated soil nutrient pool index,it could be concluded that the overall soil nutrient levels of the four different land use types showed paddy fields>grasslands>drylands>woodlands.The four land use types effectively presented the differences between soil nutrient content and ecological stoichiometric ratio of elements,which could provide theoretical support for the revegetation and soil improvement of different land-use types.
作者
李雪梅
舒英格
LI Xuemei;SHU Yingge(College of Agriculture,Guizhou University,Guiyang 550025)
出处
《中国农学通报》
2023年第28期62-69,共8页
Chinese Agricultural Science Bulletin
基金
贵阳市科技局重大专项“贵阳市茶业发展关键技术研究与示范”子项目“茶园节水技术研究与示范”(筑科合同[2011401]01号)。
