摘要
生态化学计量特征对于揭示植物对营养元素的需要和当地土壤的养分供给能力,以及植物对环境的适应与反馈能力具有十分重要的意义。以祁连山东段青海云杉林为研究对象,测定了植物和土壤中的碳（C）、氮（N）、磷（P）含量,分析了植物和土壤的C∶N、C∶P、N∶P等化学计量特征。结果显示,祁连山东段青海云杉林叶片的C、N、P含量分别为（4.626±0.977）、（4.433±1.861）、（0.911±0.089）g/kg,变异系数分别为21.12%、41.98%、9.77%;C∶N、C∶P和N∶P分别为1.185±0.427、5.140±1.267和4.904±2.145,变异系数分别为36.03%、24.65%和43.74%。土壤的C、N、P含量分别为（86.01±7.10）、（5.39±1.71）、（0.48±0.10）g/kg,土壤的C、N含量随土层深度的增加变化明显,并且C、N之间存在显著的相关关系。研究结果表明,祁连山东段哈溪林场2 700~3 000 m的青海云杉生长主要受N元素的限制。
Ecological stoichiometry plays an important role in determining nutrient elements for plant,nutrient supply capacity of local soil and adaptive and feedback ability of plant to environment. The paper determinates the content of C,N and P,analyze the ecological stoichiometry of C / N,C / P and N / P of plant and soil by taking Picea crassifolia in the east section of Qilian Mountains as research object. The outcomes show that a) the content of C,N and P of Picea crassifolia leaves are( 4. 626 ± 0. 977),( 4. 433 ± 1. 861),( 0. 911 ± 0. 089) g / kg,and the coefficient of variation are 21. 12%,41. 98% and 9. 77% respectively; b) C / N,C / P and N / P are( 1. 185 ± 0. 427),( 5. 140 ± 1. 267)and( 4. 904 ± 2. 145),and the coefficient of variation are 36. 03%,24. 65% and 43. 74%; c) the content of C,N and P of soil are( 86. 01± 7. 10),( 5. 39 ± 1. 71) and( 0. 48 ± 0. 10) g / kg. The changes of content of C and N of soil was obvious with the increase of soil depth,and the C content and N content have significant correlation. The result show that the growth of Picea crassifolia at 2 700 ~ 3 000 m of Haxi forest farm in the east section of Qilian Mountains mainly affected by N elements.
出处
《中国水土保持》
2015年第8期56-59,77,共4页
Soil and Water Conservation in China
基金
国家科技支撑计划专题(2012BAC08B02-01)
关键词
青海云杉
生态化学计量特征
养分限制
土壤养分含量
祁连山
Picea crassifolia
ecological stoichiometry
nutrient limitation
soil nutrient content
Qilian mountains
