三倍体毛白杨地上凋落物对林龄的响应  

Responses of Litterfall in Triploid Populus tomentosa Plantations to Forest Age

作　　者：宋曰钦[1] 翟明普[2] 贾黎明[2] 

机构地区：[1]安徽省黄山学院,黄山245041 [2]教育部省部共建森林培育与保护重点实验室(北京林业大学)

出　　处：《东北林业大学学报》2010年第3期17-19,22,共4页Journal of Northeast Forestry University

基　　金：“十一五”科技支撑项目(2006BAD3202-2)

摘　　要：2008年3月至2009年3月,对不同林龄(3a、5a、6a、7a)的三倍体毛白杨纸浆林地上凋落物动态变化进行分析研究。结果表明,不同林龄林分的凋落物量随林龄的增加而增加,全年凋落物总量为(216.03±59.73)～(482.38±101.34)g·m-2·a-1;凋落物的月动态变化表现为单峰曲线,最大凋落量出现在10月份;通过凋落物归还林地的N、P量及能量均随林龄的增加而增加,表现出与凋落物量相同的月动态规律。由凋落物归还的N为1.84～2.89g·m-2·a-1,归还的P为0.58～1.17g·m-2·a-1,归还到林地的能量为3.96×106～8.89×106J·m-2·a-1。Seasonal dynamic changes of litterfall in triploid Populus tomentosa pulp plantations of four different ages were studied from April 2008 to March 2009. Results showed that the total amount of literfall per square meter per year increased with forest age,ranging from （216.03±59.73） gram in three-year-old forest to （482.38±101.34） gram in seven-year-old forest. The dynamic change of litterfall in different months exhibited a unimodal curve,and the maximum value was observed in October. Total amounts of N,P and energy returned to the forest floor via litterfall also increased with age. The total amount of N returned to forest floor per square meter per year ranged from 1.84 to 2.89 gram,that of P from 0.58 to 1.17 gram,and the energy from 3.96 to 8.89MJ.

关 键 词：三倍体毛白杨 季节动态 营养元素 能量 

分 类 号：S718.556[农业科学—林学] S792.117