干旱地区农业研究2013，Vol.31Issue(3)：139-144,177,7.
阴坡-阳坡梯度上的植物叶片N∶P化学计量学特征研究
Study on plant leaf N∶P stoichiometry features from shady slope to sunny slope gradient
摘要
Abstract
Through the investigation of 18 plant plots at south Gansu Province sub-alpine meadow habitats,this paper aims to study plant leaves N,P content and their stoichiometry characteristics,and combined with the analysis of soil nutrients,to understand relationship between plant leaves N,P content and their stoichiometry characteristics and soil N P content,soil organic carbon,soil water content and soil N∶ P ratio.The results showed that plant leaf N content at different slopes varied between 4.46 mg·g-1 and 26.59 mg·g-1,with an average of 16.24 mg·g-1 ; P content was in the range of 0.71 ～ 1.98 mg·g-1,with an average of 1.37 mg·g-1 ; N∶P ratio changed between 6.43 and 17.75,and average was 11.60.The leaf N content and N ∶ P ratio on a different slope gradient had no significant difference (P ＞ 0.05),while the leaf P content was significantly different in different habitats.The inter-species differences of leaf N,P content and N∶ P ratios were significant (P ＜ 0.05),while interaction effect between species and habitats on leaf N and P content and N ∶ P ratio was not significant.Based on the evaluation of N ∶ P ratio threshold of limiting factor,plant growth in this area was affected by N,which also indicates adaptation of plants in that region to their habitat.关键词
植物叶片/N∶P/化学计量/阴坡/阳坡/亚高山草甸Key words
plant leaf/ N∶ P/ stoichiometry/ shady slope / sunny slope / sub-alpine meadow分类
农业科技引用本文复制引用
刘旻霞,马建祖..阴坡-阳坡梯度上的植物叶片N∶P化学计量学特征研究[J].干旱地区农业研究,2013,31(3):139-144,177,7.基金项目
国家自然科学基金(30970465) （30970465）
甘肃省教育厅研究生导师项目(0901-07) （0901-07）
甘肃省自然科学基金项目(1107RJZA174) （1107RJZA174）
