生态学报2017，Vol.37Issue(2)：443-454,12.DOI:10.5846/stxb201507171508
陕西省3种主要树种叶片、凋落物和土壤N、P化学计量特征
N and P stoichiometric characteristics of leaves, litter, and soil for three dominant tree species in the Shaanxi Province
摘要
Abstract
Plant nutrient stoichiometry can be used to distinguish the biological entities based on element composition and responses to environmental factors.We determined the N and P stoichiometry for leaves,litter,and soil associated with 3 dominant tree species:Robinia pseucdoacacia,Quercus liaotungensis,and Pinus tabulaeformis,at 39 sites in 29 countylevel cites of the Shaanxi Province.We aimed to distinguish the differences in leaf,litter,and soil N and P stoichiometry among the different tree species,and their relationships with environmental factors in the Shaanxi Province.Leaf N and P concentrations and their ratios,were Robinia pseucdoacacia ＞ Quercus liaotungensis ＞ Pinus tabulaeformis.Compared with plant leaves,the range and quantity of litter N and P concentration significantly reduced (P＜0.05),and the order was still Robinia pseucdoacacia ＞ Quercus liaotungensis ＞ Pinus tabulaeformis,while the order for the N ∶P ratio was Pinustabulaeformis ＞ Quercus liaotungensis ＞ Robinia pseucdoacacia.There were no significant correlations (P＜0.05) between Robinia pseucdoacacia,Quercus liaotungensis,and Pinus tabulaeformis leaf N (or P) and soil N (or P),indicating that their growth was not limited by N or P.In total,there were significant correlations between leaf P and soil P (P＜0.05),which indicated that the growth of the plant was limited by P in the Shaanxi Province.Leaf N and P increased with mean annual temperature and precipitation,especially for Robinia pseucdoacacia.The leaf N ∶ P ratio for the 3 tree species did not clearly correlate with the environmental factors.Litter N increased with mean annual temperature and precipitation,and decreased depending on the latitude and longitude.Although litter P showed no significant relationships with temperature and latitude (P＜0.05),it declined with precipitation and longitude.Litter N ∶P ratio increased with temperature and precipitation and decreased with latitude.Soil N and P increased with latitude and altitude,and decreased with mean annual temperature,mean annual precipitation,and longitude.The soil N ∶P ratios demonstrated an opposite trend.Soil P was more closely correlated with environmental factors than N,and the relationship between the 0-10 cm and 10-20 cm N and P stoichiometry in terms of environmental factors was almost the same.关键词
刺槐/辽东栎/油松/土壤/化学计量特征/地理因子/气候因子Key words
Robinia pseucdoacacia/Quercus liaotungensis/Pinus tabulaeformis/soil/stoichiometric characteristics/geographical factors/climate factors引用本文复制引用
姜沛沛,曹扬,陈云明,赵一娉..陕西省3种主要树种叶片、凋落物和土壤N、P化学计量特征[J].生态学报,2017,37(2):443-454,12.基金项目
国家自然科学基金资助项目(41201088,41371506) （41201088,41371506）
中国科学院西部之光资助项目(K301021304) （K301021304）
中国科学院陕西省森林固碳现状、速率和潜力研究(XDA05050203-05) （XDA05050203-05）
