Seasonal changes in the spatial structures of N2O, CO2, and CH4 fluxes from Acacia mangium plantation soils in Indonesia
Seasonal changes in the spatial structures of N2O, CO2, and CH4 fluxes from Acacia mangium plantation soils in Indonesia
复制标题
DOI：
10.1016/j.soilbio.2010.05.022
复制
发表时间：
2010-09-01
影响因子：
9.7
通讯作者：
Wicaksono, Agus
中科院分区：
文献类型：
--
作者：
Konda, Ryota;Ohta, Seiichi;Wicaksono, Agus
我们评估了一氧化二氮（N2 O），二氧化碳（CO2），甲烷（CH 4）通量在马占相思种植园站在印度尼西亚苏门答腊岛，在干燥（8月）和湿润（3月）季节的空间结构。在A.研究了不同地形条件下的马占相思种植园，包括上塬、下塬、上坡和坡脚。该地块分为10 × 10米网格和气体通量和土壤性质进行了测量，在77个网格点，在10米的间隔内的阴谋。气体通量和土壤性质的空间结构，确定使用地统计学分析。丰水期平均N2 O和CO2通量（1.85 mg N m（-2）d（-1）和4.29 g Cm（-2）d（-1））显著高于旱季（0.55 mg Nm ~（-2）d ~（-1））和2.73 g Cm ~（-2）d ~（-1）），平均CH 4吸收速率（-0.62 mgCm-2 d（-1））高于丰水期（-0.24 mgCm-2 d（-1））。在此基础上，研究了A. mangium土壤高于天然森林土壤在苏门答腊的报告，而CO2和CH 4通量的范围内的天然森林土壤报告的通量。这些气体通量的季节性差异似乎是由土壤含水量和基质的可用性，由于不同的降水和矿化的季节之间的凋落物控制。N2 O通量具有较强的空间依赖性，在干旱和湿润的季节，范围约为18米。地形与N2 O通量在丰水季节与高和低通量的脚坡和上高原，分别通过控制土壤中的厌氧-好氧条件。在干旱季节，地形对N_2O通量的空间格局没有明显的影响，可能与凋落物量的分布有关。两个季节CO2通量均无空间依赖性，但地形影响在干旱季节显著，坡脚处CO2通量最低，而在湿润季节，地形位置间差异不显著。凋落物量和土壤有机质的分布可能通过影响微生物活性和细根分布而与CO2通量相关。马占种植园(C)2010爱思唯尔有限公司版权所有。
We evaluated the spatial structures of nitrous oxide (N2O), carbon dioxide (CO2), and methane (CH4) fluxes in an Acacia mangium plantation stand in Sumatra, Indonesia, in drier (August) and wetter (March) seasons. A 60 x 100-m plot was established in an A. mangium plantation that included different topographical elements of the upper plateau, lower plateau, upper slope and foot slope. The plot was divided into 10 x 10-m grids and gas fluxes and soil properties were measured at 77 grid points at 10-m intervals within the plot. Spatial structures of the gas fluxes and soil properties were identified using geostatistical analyses. Averaged N2O and CO2 fluxes in the wetter season (1.85 mg N m(-2) d(-1) and 4.29 g Cm-2 d(-1), respectively) were significantly higher than those in the drier season (0.55 mg N m(-2) d(-1) and 2.73 g Cm-2 d(-1), respectively) and averaged CH4 uptake rates in the drier season (-0.62 mg Cm-2 d(-1)) were higher than those in the wetter season (-0.24 mg Cm-2 d(-1)). These values of N2O fluxes in A. mangium soils were higher than those reported for natural forest soils in Sumatra, while CO2 and CH4 fluxes were in the range of fluxes reported for natural forest soils. Seasonal differences in these gas fluxes appears to be controlled by soil water content and substrate availability due to differing precipitation and mineralization of litter between seasons. N2O fluxes had strong spatial dependence with a range of about 18 m in both the drier and wetter seasons. Topography was associated with the N2O fluxes in the wetter season with higher and lower fluxes on the foot slope and on the upper plateau, respectively, via controlling the anaerobic-aerobic conditions in the soils. In the drier season, however, we could not find obvious topographic influences on the spatial patterns of N2O fluxes and they may have depended on litter amount distribution. CO2 fluxes had no spatial dependence in both seasons, but the topographic influence was significant in the drier season with lowest fluxes on the foot slope, while there was no significant difference between topographic positions in the wetter season. The distributions of litter amount and soil organic matter were possibly associated with CO2 fluxes through their effects on microbial activities and fine root distribution in this A. mangium plantation. (C) 2010 Elsevier Ltd. All rights reserved.