生态科学2025，Vol.44Issue(3)：30-39,10.DOI:10.14108/j.cnki.1008-8873.2025.03.004
贺兰山不同植被类型凋落物-土壤碳、氮、磷生态化学计量特征分异规律及其相互关系
Variation of litter-soil carbon,nitrogen,and phosphorus ecostoichiometric characteristics between different vegetation types in Helan Mountains and their relationships
摘要
Abstract
It is of great significance to study the ecological stoichiometric characteristics of carbon(C),nitrogen(N)and phosphorus(P)in litter and soil of different vegetation types and their relationships to reveal nutrient cycling and element balance in mountain ecosystems.Four typical vegetation types(1464-2947 m)on the eastern slope of Helan Mountains were selected as the research objects to analyze the changes in C,N,P stoichiometric characteristics of litter and surface soil along the altitude and their relationships.It was found that litter total carbon content decreased first and then increased,while the litter total phosphorus content increased gradually,with the increase of altitude.There was an inflection point for litter total carbon at 1562 m,with a minimum value of 336.80 g·kg-1,and the maximum value of litter total phosphorus content was 0.92 g·kg-1 at 2947 m.Litter total nitrogen content increased first and then decreased;there was an inflection point for litter total nitrogen at 1562 m,with a maximum value of 13.73 g·kg-1.Both of the soil organic carbon and total phosphorus content increased first and then decreased with the increase of altitude,and there is an inflection point for soil organic carbon and total phosphorus at 2116 m,reached the maximum value of 79.57 g·kg-1 and 0.87 g·kg-1,respectively.Soil total nitrogen content increased gradually and reached a maximum value of 7.77 g·kg-1 at 2947 m.The ratio of nitrogen to phosphorus(N:P)and carbon to phosphorus(C:P)in litter decreased gradually with the increase of altitude,while the ratio of carbon to nitrogen(C:N)in litter decreased first and then increased.Soil C:N ratio increased first and then decreased,while soil N:P ratio and C:P ratio showed a trend of gradual increase.The total nitrogen content in litter was significantly and negatively correlated with soil organic carbon(SOC)and soil C:P ratio(P<0.05),and the total phosphorus content in litter was significantly and positively correlated with soil total nitrogen and soil total phosphorus content(P<0.01).Litter N:P ratio was significantly and negatively correlated with soil organic carbon,soil total nitrogen,soil total phosphorus content,soil N:P ratio,and soil C:P ratio(P<0.01).Litter C:P ratio was significantly and negatively correlated with soil total nitrogen and soil total phosphorus content(P<0.05).The results of this study can provide a theoretical basis for exploring the nutrient cycling of soil and litter and their relationship in different vegetation types in Helan Mountains.关键词
化学计量特征/凋落物/垂直地带性/贺兰山Key words
stoichiometric characteristics/litter/vertical zonality/Helan Mountains分类
自科综合引用本文复制引用
李小聪,崔璐瑶,司浩宇,李静尧,邱开阳,张硕,黄业芸,刘王锁,鲍平安,苏云..贺兰山不同植被类型凋落物-土壤碳、氮、磷生态化学计量特征分异规律及其相互关系[J].生态科学,2025,44(3):30-39,10.基金项目
宁夏自然科学基金优秀青年项目(2022AAC05007) （2022AAC05007）
国家自然科学基金项目(42001095) （42001095）
宁夏大学本科教育卓越教学团队项目(ZYJXTD2023003) （ZYJXTD2023003）
宁夏重点研发计划重点项目(2020BEG02001) （2020BEG02001）
宁夏大学生创新创业训练计划项目(S202110749030) （S202110749030）
