不同龄组马尾松林凋落物量及养分归还量研究

Studies of thd Amount of Litter and Nutrient Restitution in Different Age of Classes Pinus massoniana Plantation

对不同龄组马尾松人工林的年凋落物量、林地凋落物现存量及其元素含量和养分归还量进行分析测定，结果表明，从幼龄林至成熟林，马尾松林的年凋落物量为４．３９～１１．４３ｔ／ｈｍ２，林地凋落物现存量为４．９９～１３．４５ｔ／ｈｍ２，凋落物养分的年归还量为８７．７４～３５３．７１ｋｇ／ｈｍ２，林地凋落物养分的总贮量为１０１～２４８ｋｇ／ｈｍ２．这说明森林凋落物是一个庞大的养分贮存库，它对于维护林地地力，提高森林生产力具有重要的意义．

The annual amount of litter and nutrient restitution in different age classes of Pinus massoniana plantation, the existing storage of the litter,and the content of elements in the litter have been determined and analysed.The results show that from young stand to mature stand,the annual amount of litter is 4.39～11.43t/hm2,the existing storage of the litter on the stand is 4.99～13.45t/hm2, the annual restitution amount of litter nutrient is 87.74～353. 71kg/hm2,and thd total amount of nutrient stored in the litter is 101～248kg/hm2. The data above proves that forest litter forms a huge storage of nutrient,which plays an important role in maintaining site quality and raising forest productive forces.