CONTRIBUTIONS OF ABOVEGROUND LITTER, BELOWGROUND LITTER, AND ROOT RESPIRATION TO TOTAL SOIL RESPIRATION IN A TEMPERATURE MIXED HARDWOOD FOREST
CONTRIBUTIONS OF ABOVEGROUND LITTER, BELOWGROUND LITTER, AND ROOT RESPIRATION TO TOTAL SOIL RESPIRATION IN A TEMPERATURE MIXED HARDWOOD FOREST
复制标题
DOI：
10.1139/x93-177
复制
发表时间：
1993-07-01
影响因子：
2.2
通讯作者：
GARRISON, JB
中科院分区：
文献类型：
--
作者：
BOWDEN, RD;NADELHOFFER, KJ;GARRISON, JB
由于难以分别测量根系呼吸和根系凋落物对土壤呼吸的贡献，因此难以估计根系呼吸和根系凋落物对土壤呼吸的贡献。在马萨诸塞州的阔叶混交林中，通过设置沟道和根障，增加或去除地上凋落物，并终止活根的活动，以确定地上凋落物、地下凋落物和根呼吸对土壤总呼吸的贡献。年土壤呼吸控制地块，测量的钠石灰技术，为371克C - m-2。年-1。我们使用地上凋落物输入（1 38克C - m-2。年-1）和处理地块之间二氧化碳排放量的差异，以计算活根呼吸（33%）和来自地上（37%）和地下（30%）凋落物的有机质对土壤呼吸的贡献。新沉积的地上凋落物贡献了31%的总地上凋落物排放的二氧化碳。这一估计与枯枝落叶分解研究中公布的值一致。在这片森林中，近三分之二的土壤呼吸可归因于根系活动，与以前的研究表明，活根呼吸加上根凋落物分解贡献了70-80%的总土壤呼吸在广泛的森林。
Estimating contributions by root respiration and root litter to total soil respiration is difficult owing to problems in measuring each component separately. In a mixed hardwood forest in Massachusetts, we added or removed aboveground litter and terminated live root activity through construction of trenches and root barriers to determine the contribution of aboveground litter, belowground litter, and root respiration to total soil respiration. Annual soil respiration at control plots, measured by the soda-lime technique, was 371 g C - m-2. year-1. We used aboveground litter inputs (1 38 g C - m-2. year-1) and differences in carbon dioxide effluxes among treatment plots to calculate contributions to total soil respiration by live root respiration (33%) and by organic matter derived from aboveground (37%) and belowground (30%) litter. Newly deposited aboveground litter contributed 31% of the carbon dioxide emitted by total aboveground litter. This estimate is consistent with values published in litter decomposition studies. Nearly two thirds of soil respiration in this forest can be attributed to root activity, comparable with a previous study suggesting that live root respiration plus decomposition of root litter contributes 70-80% of total soil respiration across a wide range of forests.