泰国原始和次生干燥双子叶树森林土壤呼吸作用的比较与环境控制

Wittanan Tammadid, Bantita Sangkachai, P. Chanonmuang, A. Chidthaisong, P. Hanpattanakit
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引用次数: 0

摘要

森林生态系统中的土壤呼吸(Rs)是全球碳循环的一个重要过程。过去对森林自然资源的不平衡利用和森林砍伐导致了森林结构、树木生长和 Rs 排放的二氧化碳(CO2)的变化。了解原始森林和次生林中的 Rs 对全球碳循环起着至关重要的作用。因此,本研究旨在估算和比较泰国原始干燥双子叶林(PDDF)和次生干燥双子叶林(SDDF)中的Rs与环境变量(空气和土壤温度以及土壤湿度)的日变化和季节变化的关系。从 2019 年 3 月到 2020 年 2 月,在泰国那空叻丕府和叻丕府的 PDDF 和 SDDF 地点连续测量了二氧化碳通量。采用土壤梯度法,二氧化碳探头每分钟测量两个地点 Rs 的平均二氧化碳浓度。此外,还连续测量了空气和土壤温度以及土壤湿度,以分析 Rs 与环境变量之间的相关性。PDDF和SDDF的年平均土壤呼吸速率分别为8.16吨C ha-1 yr-1和8.83吨C ha-1 yr-1。两地 Rs 的昼夜变化随气温和土壤温度的变化而变化。PDDF 地块平均 Rs 的月变化低于 SDDF 地块。土壤水分和土壤温度与两地 Rs 的月变化有显著相关性。在雨季,PDDF 和 SDDF 地点的 Rs 排放量较高,分别占全年总排放量的约 61% 和 56%。结果表明,土壤温度和气温是昼夜变化的主要驱动因素,而土壤湿度、土壤温度和气温的组合则决定了季节变化。此外,落叶产生量是促进 SDDF 地点土壤呼吸的主要碳基质,因为 PDDF 地点的落叶产生量(5.32 吨干物质/公顷-年-1)明显低于 SDDF 地点(10.49 吨干物质/公顷-年-1)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparison and environmental controls of soil respiration in primary and secondary dry dipterocarp forests in Thailand
Soil respiration (Rs) in forest ecosystems is an important process in the global carbon cycle. The unbalanced use of forest natural resources and deforestation in the past have resulted in changes in forest structure, tree growth, and the release of carbon dioxide (CO2) emissions from Rs. Understanding Rs in both primary and secondary forests plays a crucial role in the global carbon cycle. Therefore, the purpose of this study was to estimate and compare Rs in primary dry dipterocarp forests (PDDF) and secondary dry dipterocarp forests (SDDF) in Thailand, in relation to diurnal and seasonal variations in environmental variables (air and soil temperatures, and soil moisture). CO2 flux was measured continuously from March 2019 to February 2020 in the PDDF and SDDF sites in the Nakhon Ratchasima and Ratchaburi provinces of Thailand. Using the soil gradient method, CO2 probes were employed to measure average CO2 concentrations from Rs every minute in the both sites. Additionally, air and soil temperatures and soil moisture were measured continuously to analyze the correlation between Rs and environmental variables. The average annual soil respiration rate in PDDF and SDDF were 8.16 and 8.83 tons C ha−1 yr−1, respectively. The diurnal variation of Rs in both sites changed according to air and soil temperatures. The monthly variation of the average Rs was lower in the PDDF site than in the SDDF site. Soil moisture and soil temperature were significantly correlated with the monthly variation of Rs in both sites. Rs in the PDDF and SDDF sites exhibited high emissions during the wet season, accounting for ~61 and 56% of the total annual emissions, respectively. The results indicated that soil and air temperatures were the main drivers of diurnal variation, while the combination of soil moisture and soil and air temperatures determined the seasonal variations. Additionally, litterfall production was the main carbon substrate promoting soil respiration in the SDDF site, as litterfall production was significantly lower in the PDDF site (5.32 tons dry matter ha−1 yr−1) than in the SDDF site (10.49 tons dry matter ha−1 yr−1).
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