草业学报2018，Vol.27Issue(4)：27-33,7.DOI:10.11686/cyxb2017414
川西北高寒沙地不同年限高山柳土壤生态化学计量及储量变化特征
Effect of Salix cupularis plantations on soil stoichiometry and stocks in the alpine-cold desert of northwestern Sichuan
摘要
Abstract
Based on their different plantation ages,6,18 and 24 yr old Salix cupularis plantations in the alpinecold desert of Northwest Sichuan were selected to explore the nature of ecological stoichiometry changes in C,N and P under S.cupularis.The results showed that the ratio of C ∶ N ∶ P increased with plantation age in the 0-60 cm soil layer.Soil C ∶ N and C ∶ P increased with plantation age in the 20-40 cm and 40-60 cm soil layers,but the soil N ∶ P significantly decreased with plantation age (P＜0.05).Soil organic carbon (SOC) stock increased with forest development in the 0-60 cm layers,but total N (TN) and total P (TP) stocks showed the opposite trend.SOC,TN and TP significantly increased in the 0-20 cm soil layer (P＜0.05).A two-way ANOVA indicated that soil depth,plantation age and soil depth × plantation age significantly affected soil stoichiometric characteristics and stocks (P＜0.01).The exceptions were soil TP contents,which did not significantly differ with plantation age,and soil C ∶ N and P stock,which did not significantly differ by soil depth × plantation age.The results show that imbalances in soil C ∶ N ∶ P occurred with plantation aging due to imbalances of C,N and P input.关键词
高寒沙地/高山柳/碳、氮、磷生态化学计量Key words
alpine-cold desertland/Salix cupularis/C,N,P ecological stoichiometry引用本文复制引用
何佳,胡玉福,舒向阳,王琴,贾安都,严星..川西北高寒沙地不同年限高山柳土壤生态化学计量及储量变化特征[J].草业学报,2018,27(4):27-33,7.基金项目
国家自然基金面上项目(41771552),国家科技支撑计划项目(2015BAC05B01)和国家级大学生创新创业训练计划项目(201710626035)资助. （41771552）
