中国南北样带上栲属树种叶功能性状与环境因子的关系

Relationships between Leaf Traits of Castanopsis Species and the Environmental Factors in the North-South Transect of Eastern China

以南北样带上9种主要栲属树种为研究对象,分析了栲属树种的主要功能性状与环境因子的关系。结果表明:样带上栲属树种的单位面积最大净光合速率与年平均气温成显著负相关(r=-0.413,P<0.05),与年光合有效辐射呈显著正相关(r=0.457,P<0.05),与年均降水量相关性不显著。比叶面积与年平均气温和年降水量均成显著的正相关(r=0.418,P<0.05;r=0.334,P<0.05)。在叶片养分含量方面,栲属树种的叶氮含量、叶磷含量与年平均气温、纬度均无明显的相关性。

Quantifying correlations between leaf traits and environmental factors not only gives insight into selective pressures that have shaped vegetation evolution, but also plays a crucial role in predicting vegetation productivity shift with climate and land use change. The authors measured specific leaf area （ SLA）, leaf nitrogen per unit mass, leaf phosphorus per unit mass, leaf potassium per unit mass and leaf photosynthetic capacity per unit area for 9 Castanopsis species in North-South Transect of China, then analyzed the relationships between the leaf traits and environmental factors. The results showed that leaf photosynthetic capacity per unit area was negatively correlated with mean annual temperature （MAT） （ r = - 0. 413, P 〈 0.05 ）, but positively correlated with photosynthetic available radiation, （r = 0. 457, P 〈 0.05 ）, while no correlation with mean annual rainful（ r = -0. 072, P 〉 0.05 ）. SLA was positively correlated with MAT and mean annual rainful （r =0.418, P 〈0.05;r =0. 334, P 〈0.05）. There are no correlation with between leaf N content, leaf P content of Castanopsis species and latitude, mean annual temperature.