Spatial and temporal variation in soil respiration in a Southeast Asian tropical rainforest
Spatial and temporal variation in soil respiration in a Southeast Asian tropical rainforest
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DOI：
10.1016/j.agrformet.2007.06.005
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发表时间：
2007-11-12
影响因子：
6.2
通讯作者：
Nik, Abdul Rahim
中科院分区：
文献类型：
--
作者：
Kosugi, Yoshiko;Mitani, Tomonori;Nik, Abdul Rahim
以马来西亚半岛低地龙脑果林为研究对象，研究了土壤温度和水分对土壤呼吸速率及其时空变化的影响。采用不同网格大小的套式抽样设计，在50m×50m的小区内测定了土壤呼吸速率、温度和水分。土壤呼吸速率的变化随样地面积的增大而增大。地统计学分析表明，土壤呼吸速率与含水率的空间自相关范围在4.4~24.7m之间，土壤含水率高的土壤呼吸速率在空间上较低。相反，在时间上，土壤干燥时土壤呼吸速率较低。在干旱时期，湿润地区土壤呼吸速率仍然较低。这些结果表明，饱和土壤中气体扩散率的限制等物理因素并不是湿润地区土壤呼吸速率低的主要原因，土壤呼吸速率的时空双极变化是由土壤水分共同变化的几个物理、生物和化学性质决定的。(C)2007 Elsevier B.V.保留所有权利。
The influence of soil temperature and water content on soil respiration rate, and its spatio-temporal variation, were evaluated for a lowland dipterocarp forest in Peninsular, Malaysia. Soil respiration rate, temperature and water content were measured in a 50m x 50-m plot with a nested sampling design of varying grid size. The variation in soil respiration rate increased with plot size. Geostatistical analysis indicated that the range of spatial autocoffelation for soil respiration rate and water content fell between 4.4 and 24.7 m. Spatially, the soil respiration rate was low where soil water content was high. In contrast, temporally, the soil respiration rate was low when the soil was dry. During dry periods, the soil respiration rate was still lower in wetter areas. These results suggest that a physical factor such as the restriction of gas diffusivity in water-saturated soil is not the primary cause of the low soil respiration rates in wetter places, and that several physical, biological and chemical properties co-varying with soil water drive the bipolar spatial and temporal variation of soil respiration rate. (C) 2007 Elsevier B.V. All rights reserved.