同林龄马尾松与湿地松幼树凋落物养分及能量动态

Dynamics of litter nutrient and energy of Pinus massoniana and Pinus elliottii saplings with the same forest age

对福建省政和县杨源乡相似生境下5年生的马尾松、湿地松幼树凋落物生物量、热值及养分元素之间相关性进行研究。结果表明:除春季生物量为马尾松小于湿地松之外,马尾松幼林夏季、秋季、冬季凋落物生物量均高于湿地松幼林;不同养分元素的平均含量,两者的C含量差别不大,而N、P、Mg含量为马尾松大于湿地松,K含量除秋季马尾松小于湿地松外,其他三季马尾松均大于湿地松,Ca含量马尾松春季和冬季均小于湿地松,夏季和秋季均大于湿地松;两种造林树种不同季节的平均干质量热值,马尾松均高于湿地松;春季和秋季马尾松凋落物热值与C养分质量分数呈显著相关,与其他养分质量分数相关均不显著;春季湿地松凋落物热值与C质量分数呈显著的正相关。

Five years old Pinus massoniana and Pinus elliottii had been chosen as research objects, of which were in similar habitat in Yangyuan College, Zhenghe Country, Fujian Province, and their litter’s biomass, caloriifc value and correlation between nutrient elements had been comprehensively analyzed. The results showed that, apart from spring, the litter biomass of young plantation in P. Massoniana were all more than P. elliottii. Besides,N, P, Mg contents of P. massoniana plantation were all more than P. elliottii, C contents present opposite trends. Apart from autumn, the K contents of P. Massoniana were all more than P. elliottii in other three seasons. In spring and winter, the contents of Ca in P. Massoniana were less than P. elliottii, and other two seasons showed opposite results. The litter calorific value of P. Massoniana were all higher than P. elliottii in four seasons. The litter calorific value of P. massoniana in the spring and autumn had signiifcant positive correlation with C content,but did not signiifcant correlated with other nutrient content. The litter caloriifc value of P. elliottii in spring had signiifcant positive correlation with C content.