西藏林芝云杉林凋落物的特征研究

STUDY ON THE CHARACTERISTIC OF LITTERFALL OF PICEA LIKIANGENSIS VAR .LINZHIENSIS FOREST IN TIBET

本文报道了西藏林芝云杉林的凋落量、凋落特征及凋落物中主要营养元素（Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ）的含量。３年的测定结果表明，林芝云杉林的年均凋落量为３８４３．２３ｋｇｈｍ－２ａ－１，其中枯叶量占７０．５２％，枯枝、杂物各占１４．３３％和１５．１４％。凋落物中主要营养元素的含量为１００．６５ｋｇｈｍ－２ａ－１。凋落物均有明显的季节变化规律。各类凋落物的凋落特征从一定角度反映了林芝云杉林群落一般的生物学与生态学特性以及对西藏高原环境条件的适应性。

This paper analyses the amount,characteristic and contents of major nutrient elements,such as N,P,K,Ca,Mg,of litterfall of Picea likiangensis var. linzhiensis forest in Linzhi Tibet.The results show that the average annual amount of litterfall of the forest was 3843.23kg·hm -2 ·a -1 .70.52% of it was distributed in withered leaves,14.33% of it in withered twigs, and 15.14% of it in the otherplant parts.The content of the major nutrient elements was 100.65kg·hm -2 ·a -1 .The litterfall changed with the seasons.the characteristics of all kinds of litterfall reflect the biological and ecological properties of the forest,and they also reflect adaptation of the forest to Tibetan plateau.