元江干热河谷典型植物的叶片化学计量特征

Stoichiometric characteristics of leaves of typical plants in the dry-hot valley of Yuanjiang

研究元江干热河谷不同植物叶片的C、N、P化学计量特征,可为该地区植被恢复的措施制定提供理论参考.选取元江河谷的30种典型植物的叶片,分析和研究了叶片的C、N、P和化学计量特征.研究发现元江干热河谷植物叶片C、N、P元素质量比分别为408.54±28.15、16.64±5.12、2.39±0.58 mg·g^(−1),变异系数分别为0.069、0.307和0.242.N和P极显著正相关(P<0.01);C/N(w(C)∶w(N))、C/P(w(C)∶w(P))及N/P(w(N)∶w(P))分别为26.44、178.91、6.99,N与N/P极显著正相关(P<0.01).相对其他研究,元江干热河谷植物叶片C、N元素含量偏低,而P元素含量偏高,N/P小于14,均为N受限植物.30种植物聚为5类,根据聚类结果分析了氮磷利用效率和木质化程度得出,第Ⅰ类群植物,即厚皮树、滇刺枣、毛枝青冈、三叶漆、虾子花、华西小石积、心叶木、木紫珠、清香木、变叶翅子树、细基丸可能具有更高的适应元江的干热环境的潜力.

The stoichiometric characteristics of C,N and P in leaves of different plants in Yuanjiang dry-hot valley were studied,which could provide a theoretical reference for the establishment of vegetation restoration of this area.Carbon,nitrogen,phosphorus and stoichiometric characteristics of leaves from 30 typical plants in Yuanjiang valley were analyzed and studied.The contents of C,N and P of the leaves were 408.54±28.15,16.64±5.12 and 2.39±0.58 mg·g^(−1),the coefficients of variation were 0.069,0.307 and 0.242,respectively.N and P were significantly positively correlated(P<0.01).C/N,C/P and N/P were 26.44,178.91 and 6.99,respectively.It was found that N and N/P were significantly positive correlated(P<0.01).Compared with other studies,the content of C and N elements in the leaves of plants in the dry-hot valley of the Yuanjiang is relatively low,while the content of P elements is relatively high,N/P is less than 14,indicating that all 30 plants are N-restricted.The result showed that the 30 plants were grouped into 5 groups,the utilization efficiency of nitrogen and phosphorus and the degree of lignification were analyzed based on the cluster results,the plants of group I may have higher potential to adapt to the dry and hot environment of Yuanjiang.