摘要
碳(C)、氮(N)、磷(P)在植物生长和各种生理调节机能中发挥着重要作用。为研究云南灌丛生态系统C、N、P含量之间的关系以及植物生物量、土壤C、N、P含量与植物C、N、P含量的相互影响,该研究采用样地调查的方法,在云南省云南杨梅(Myrica nana)灌丛主要分布区设立了29个样地,通过测量样地中云南杨梅灌丛C、N、P含量,系统分析了云南杨梅C、N、P的计量规律。结果显示:1)研究区域云南杨梅根、茎、叶的C、N、P含量的平均值分别是45.94%、0.54%、0.03%,46.32%、0.58%、0.03%和49.05%、1.70%、0.06%(干质量),其中叶的C、N、P含量均显著高于茎和根。在根中C:N:P为1 531:18:1,在茎中C:N:P为1 544:19:1,而在叶中C:N:P为818:10:1,反映了云南杨梅不同部位元素计量不同的分配关系;2)云南杨梅叶片中C含量和N:P值随生物量的增加而降低,但只有叶片C含量与生物量的相关关系极显著,而N:P值与生物量的相关关系不显著。叶片中N含量和P含量随生物量的增加而升高,其中P含量与生物量的相关关系显著,N含量与生物量的相关关系不显著。云南杨梅叶的N:P(34.2)明显大于8,说明P是云南杨梅生长的限制因素。3)根的C、N、P含量与土壤中的P含量都有显著的相关性,其中N、P为极显著正相关,C为显著负相关;茎的C含量与土壤的C、N、P含量都显著负相关,且N、P含量的相关性极显著,而茎的P含量与土壤中的P含量极显著正相关;叶的P含量与土壤的C、N、P含量都极显著正相关,叶的C含量则与土壤的P含量极显著负相关。该研究结果可为西南高原灌丛生态系统的研究提供数据支持。
Aims Carbon （C）, nitrogen （N） and phosphorus （P） play important roles in plant growth and physiological functions. We aimed at exploring the intrinsic relationships of C, N and P in Myrica nana—a common shrub in Yunnan Province—as well as their relationships with pant biomass and soil nutrients.
Methods We measured the concentration of C, N and P of M. nana from 29 sites for their magnitudes and correlations with soil nutrients.
Important findings 1） The arithmetic mean value of C, N and P concentration in the roots, stems and leaves of M. nana was 45.94%, 0.54%, 0.03%, and 46.32%, 0.58%, 0.03%, and 49.05%, 1.70%, 0.06%, respectively. C, N and P concentrations in the leaves were significantly higher than those in the roots and the stems. The C：N：P in roots, stems and leaves was 1 531：18：1, 1 544：19：1, and 818：10：1, respectively. 2） The C concentration and N：P in leaves of M. nana decreased with the increase of biomass of M. nana; the leaf C concentration was significantly correlated with biomass （p 〈 0.01）, while the correlation between N：P and biomass was not significant （p 〉 0.05）. The leaf N increased with the increase of plant biomass, the P was significantly correlated with biomass （p 〈 0.05）, but the correlation between N concentration and biomass was not significant （p 〉 0.05）. N：P in leaves was 34.2, suggesting that plant growth was limited by P. 3） C, N and P concentration in the roots were significantly correlated with soil P （p 〈 0.05）, with N, P concentrations correlated with soil P positively （p 〈 0.01） and C negatively （p 〈 0.05）. C concentration in the stems was significantly and negatively correlated with soil C, N, with significant correlation with C, N, and P concentration （p 〈 0.01）. P concentration in the stems was significantly and positively correlated with soil P concentration （p 〈 0.01）, while leaf P significantly and positively correlated with soil C, N and P （p 〈 0.01）; leaf C concentration was significantly and negatively correlated with soil P （p 〈 0.01）.
出处
《植物生态学报》
CAS
CSCD
北大核心
2017年第1期136-146,共11页
Chinese Journal of Plant Ecology
基金
中国科学院战略性先导科技专项(XDA-050503030201)
国家自然科学基金(31560189)
关键词
云南杨梅
碳
氮
磷
元素计量
生物量
土壤
Myrica nana
carbon
nitrogen
phosphorus
stoichiometry
biomass
soil
