草业学报2017，Vol.26Issue(4)：43-52,10.DOI:10.11686/cyxb2016317
宁夏典型草原不同退耕年限草地植物-土壤生态化学计量特征
Effect of grassland restoration duration on plant-soil ecological stoichiometry characteristics in a typical steppe
摘要
Abstract
To determine the influence of restoration period on the stoichiometry of dominant plant species and soil C,N,P of typical steppe in Ningxia,China,the stoichiometric characteristics of dominant plant species and soil C,N,P in grassland abandoned for periods of 0,1,3,5,6,8,11,15 and 20 years.The total nitrogen content of individual plants showed that the aboveground portion is greater than the belowground portion;the total nitrogen content of Artemisia scoparia was higher than other species.Similarly the total P content of plants was dominated by the above ground portion with the exception of Leym us secalinus plants.The organic carbon in grassland abandoned for 1 year Setaria viridis and 3 years L.secalinus was greater in the underground portion;for remaining abandonment periods the aboveground portion was greater than underground portion.The highest C ∶ N,C ∶ P,N ∶ P ratio's in dominant plants in 20 year grassland occurred in S.bungeana and the lowest in L.secalinus and A.scoparia.Abandonment periods between 6 and 20 years resulted in soil organic carbon content layer decreasing from the surface with increasing depth while abandonment periods between 0-6 years resulted in fluctuating changes in soil N.The response of total P to abandonment period was similar to that of total N.The soil C ∶ N ration varied from 7.08-19.62,C ∶ P ranged from 6.60 to 35.25,N ∶ P varied from 0.82 to 2.17;the mean soil C ∶ N ration ranged from 11.18 to 15.03 in different soil layers,C ∶ P from 14.09 to 24.55 and N ∶ P from 1.06 to 1.98;The soil C ∶ P and N ∶ P ratio's were generally lower than those typically found in other regions of China while the C ∶ N ration was similar to typical values in China.There was no correlation between soil C ∶ N and soil organic carbon but there was a negative correlation with total N,meaning that C ∶ N was mainly controlled by N;the C ∶ P ratio was significantly positively correlated with organic carbon but not with total P.There was a significant positive correlation between soil N ∶ P and total soil N,indicating this ration is primarily controlled by N.Total soil N showed a fluctuating upward trend with increasing abandonment period.There was a strong correlation between total plant P and total soil P (P＜0.01);soil organic C was also correlated with N ∶ P (P＜0.05).关键词
宁夏典型草原/退耕草地/土壤/优势植物/碳、氮、磷生态化学计量Key words
typical steppe in Ningxia/abandoned grassland/soil/dominant plant/C,N,P stoichiometry引用本文复制引用
饶丽仙,沈艳,聂明鹤..宁夏典型草原不同退耕年限草地植物-土壤生态化学计量特征[J].草业学报,2017,26(4):43-52,10.基金项目
国家自然科学基金(31360582,31460632)资助. （31360582,31460632）
