河南荆条灌丛叶片C、N和P含量特性研究.docVIP

河南荆条灌丛叶片C、N和P含量特性研究 摘　要 荆条，为马鞭草科牡荆属植物，根系发达，耐干旱、耐盐碱，为我国暖温带的优势物种，也是河南省主要的灌丛植被。碳（C）、氮（N）、磷（P）三种元素是所有植物生长必需的大量元素，在植物的各种生理生态过程中发挥着及其重要的作用，同时也限制着植物的生长与地理分布，且彼此之间联系紧密。叶片C、N和P元素含量在生态系统的功能和进化中起了极为重要的作用。我们对河南多地的荆条灌丛叶片进行取样、分析、研究，结果表明，河南省荆条灌丛叶片C含量为45.0821%，N含量为1.7757%，P含量为1.2913 mg/g；荆条灌丛叶片的C与P元素随着叶片N含量的增大而明显增加，尤其是P元素（P 0.01）。荆条灌丛叶片的N：P为1.4748，C：N为26.3485，C：P为38.5009，由此可看出河南省荆条叶片对养分利用效率较高。通过对河南省荆条灌丛叶片的C、N和P含量与采样点经纬度进行研究分析，得出：荆条灌丛叶N含量随着经度的增高而明显增高。河南省荆条灌丛叶片的C：N、C：P和N：P随着采样点纬度的增高而增高，荆条灌丛叶片的N：P随着采样点经度的增大而明显增大。通过对河南荆条灌丛叶片的C、N和P含量特性及其彼此之间的相互关系，给我们把握荆条灌丛叶片的化学计量学特征提供有效依据，并且我们在弄清荆条灌丛叶片的C、N和P含量与经纬度关系之后可以更清晰的认识荆条灌丛叶片养分的地理分布特征。 关键词：荆条，叶片，C含量，N含量，P含量 Henan?Vitexnegundocommunity?Leaf C,?N?and P in?Characteristic Research ABSTRACT Vitex is Verbenaceae, Vitex species,it has developed roots.It has very strong capability of soil conservation,and it can be drought resistant, and has salt tolerance.It is the dominant species in the warm temperate zone.The important species and pioneer species for vegetation restoration and regeneration of it in Henan Province.It has strong ability of soil conservation.Carbon (C), nitrogen (N) and phosphorus (P) of three elements is an essential nutrient for all plant growth, and play an important role in various physiological processes of plants.At the same time they also limit the growth of plants, and with plant growth links are very close, and the connections between each other is very close.C, N and P contained in the leaves of the element content on the function and evolution of the ecological system plays an extremely important role.The content of C in vitexnegundocommunity leaves in Henan province is 45.0821 ±0.6880（%）, the content of N is 1.7757 ± 0.3879（%）, the content of P is 1.2913 ±0.4387(mg/g).lg C and lg P vitexnegundocommunity leaves significantly increased with increasing lg N, especially lgP.Vitexnegundocommunity leaf N:P is 1.4748, C:N is 26.3485, C:P is 38.5009, which can be seen in Henan province Vitex leaves on nutrient use