红壤侵蚀区马尾松林恢复过程中土壤异养呼吸及其温度敏感性的变化*
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福建师范大学

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S153.6

基金项目:

国家自然科学基金项目(31870604,32030073)和福建省对外合作项目(2019I0010)


Changes in soil heterotrophic respiration and its temperature sensitivity during restoration of Pinus massoniana plantations in eroded red soil area.
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Fujian Normal University

Fund Project:

National Natural Science Foundation of China(No. 31870604,32030073)and the International Cooperation Project of Fujian (No. 2019I0010)

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    摘要:

    土壤异养呼吸是影响土壤有机碳积累的关键因素。本研究以南方红壤水土流失区不同恢复年限的马尾松林:未治理地(Y0)、恢复14a(Y14)、恢复31a(Y31)为对象,对不同呼吸组分进行测定并结合温度水分以及微生物等因子,研究马尾松林恢复对土壤异养呼吸的影响。结果表明:不同恢复年限马尾松林土壤异养呼吸差异显著,恢复31a显著大于恢复14a以及未治理地,未治理地异养呼吸速率仅为0.99?μmol.m-2.s-1,而治理14a、31a分别为2.20、2.80?μmol.m-2.s-1;温度是异养呼吸季节变化的主要影响因子,分别解释季节变化的40.6%(Y0)、62.2%(Y14)、66.6%(Y31);马尾松林恢复过程中土壤异养呼吸温度敏感性(Q10)呈递增趋势,分别为1.58、1.93和1.82;不同恢复年限土壤异养呼吸占土壤总呼吸比例为77.94%(Y0)、70.84%(Y14)、77.35%(Y31)。结构方程表明,在马尾松林恢复过程中,SOC、温度以及土壤微生物是影响土壤异养呼吸变化的主要因子,其中SOC、土壤微生物与异养呼吸显著正相关,温度与异养呼吸显著负相关。本研究结果表明,马尾松植被恢复SOC的积累以及缺乏有效的物理保护增加了微生物对其利用强度,另一方面土壤环境温度的改善、细菌、真菌丰度的持续增加以及群落中变形菌、子囊菌、酸杆菌的增加更进一步加剧微生物对原有土壤有机质的分解强度,导致异养呼吸碳排放的持续增加,限制马尾松林土壤碳吸存效率。因而,红壤侵蚀退化区强烈的土壤异养呼吸是限制土壤有机质进一步提升的关键因子。

    Abstract:

    【Objective】In the process of vegetation restoration in eroded red soil area, the accumulation rate of soil organic matter seriously restricts the improvement of productivity of Masson pine. How to solve this problem has been an inevitable development process of Masson pine in eroded red soil area. Heterotrophic respiration, an important part of soil carbon emission, is a key factor affecting soil organic carbon accumulation. Therefore, to study the effects of pine restoration on heterotrophic respiration and its sensitivity in eroded red soil areas is of great significance for us to deeply understand the carbon output process and effectively increase soil organic matter accumulation in eroded red soil areas. 【Method】 In this study, pine forests with different restoration years were selected in the eroded red soil area of south China. Different soil respiration components were separated by trenching method in unrestored land (Y0), restored for 14 years (Y14) and restored for 31 years (Y31), and the effects of restoration on soil heterotrophic respiration were studied by combining temperature, moisture and microbial factors. 【Result】 The results showed that the heterotrophic respiration (Rh) of the pine forests with different recovery years differed significantly. The Rh in site Y31 was significantly higher than that in site Y14 and Y0. The Rh in site Y0 was only 0.99 μmol.m-2.s-1, while that in site Y14 and Y31 was 2.20 and 2.80 μmol.m-2.s-1, respectively. The ratio of Rh to total soil respiration in different restoration years was 77.94% (Y0), 70.84% (Y14) and 77.35% (Y31). The temperature sensitivity (Q10) of Rh shows an increasing trend during the restoration of the pine forest, with the values in 1.58, 1.93 and 1.82, respectively. The relative contributions of Rh to total soil respiration in different recovery years are 77.94% (Y0), 70.84% (Y14), and 77.35% (Y31), respectively. The structural equation model showed that SOC, temperature and soil microbes are the main factors affecting Rh during the restoration process of masson pine forest. SOC and soil microbes are significantly correlated with Rh, while there is a negative relationship between temperature and Rh. 【Conclusion】 We concluded that the accumulation of SOC and the lack of effective increase the microorganism for the intensity of the physical protection, on the other hand, the improvement of soil environmental temperature, the continuous increase of bacteria and fungi abundance, and the increase of Proteobacteria, Ascomycota and Acidobacteria in the community further aggravate the microbes to the original strength of soil organic matter decomposition. As a consequence, the continuous increase of heterotrophic respiration related carbon emissions and thus limits the increase of carbon sequestration efficiency in Pinus massoniana forest. Therefore, the strong soil heterotrophic respiration in the eroded and degraded red soil area may be the key factor limiting the further improvement of soil organic matter.

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姜永孟,邓翠,吕茂奎,熊小玲,李佳玉,谢锦升.红壤侵蚀区马尾松林恢复过程中土壤异养呼吸及其温度敏感性的变化*[J].土壤学报,,[待发表]
Jiang yong meng, Deng cui, Lü mao kui, Xiong xiao ling, Li jia yu, Xie jin sheng. Changes in soil heterotrophic respiration and its temperature sensitivity during restoration of Pinus massoniana plantations in eroded red soil area.[J]. Acta Pedologica Sinica,,[In Press]

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