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苏北杨树人工林细根生产力与周转

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2008年05期
Page:
76-80
Column:
研究论文
publishdate:
2008-09-30

Article Info:/Info

Title:
Annual production and turnover rate of fine roots in poplar plantations in north of Jiangsu
Article ID:
1000-2006(2008)05-0076-05
Author(s):
WANG Liang-gui1 ZHU Qiang-gen2 ZHANG Huan-chao2* WANG Yi-kun2 YANG Li2
1. College of Landscape Architecture Nanjing Forestry University, Nanjing 210037, China; 2. College of Forest Resources and Enviromnent Nanjing Forestry University, Nanjing 210037, China
Keywords:
Poplar Fine roots Plant patterns Annual net production Turnover rate
Classification number :
S763.3
DOI:
10.3969/j.jssn.1000-2006.2008.05.015
Document Code:
A
Abstract:
Fine root biomass was studied using the sequential soil coring method in two four-year-old poplar plantations (Populus deltoides cv. 35.), which grew at the 2hm2grid pattern (Pw) and the 2hm2grid dyke pattern (PT), in Suqian, Jiangsu province from March, 2006to 2007. The annual production, mortality, decomposition and turnover rates of the fine roots in the depth of 0--40cm were also estimated and compared using the decision matrix method (DM) and the max-rain method (MM). The results showed that the mean standing pools of fine roots was 1.26--1.86t/htn2in two patterns. The annual net production, mortality, decomposition and turnover rates for fine roots were 2.24t/hm2, 2.34t/hm2, 1.88t/hm2, 1.43times/a (Pw) and 1.43t/hm2, 1.29t/hm2, 1.37t/hm2, 1.31times/a (PT) by the DM method, respectively. Compared with the DM method, about 19% annual net production, 68% mortality, 89% decomposition and 23% turnover rates for fine roots were underestimated by the MM method. Soil nutrient and seasonal water content were the main possible reasons for the differences of fine-root production and turnover rates between Pw and PT patterns.

References

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Last Update: 2013-05-20