改变碳输入对南亚热带海岸沙地典型天然次生林土壤呼吸的影响

发布时间：2018-06-24 21:13

本文选题：南亚热带 + 沙质海岸　；参考：《中国水土保持科学》2017年02期

【摘要】：土壤呼吸是陆地生态系统碳循环的一个重要过程,开展环境因子和改变碳输入对土壤呼吸影响的研究具有重要意义。2015年3月—2016年2月,在南亚热带海岸沙地典型天然次生林中设置去除根系、去除凋落物、加倍凋落物和对照4种处理,采用LI-8100连续观测改变碳输入对土壤呼吸的影响。结果表明:改变碳输入没有显著影响10cm土壤温度和湿度(P0.05);不同处理土壤呼吸速率存在明显的季节变化,表现为夏高冬低,最大值出现在5月或者6月,最小值出现在11月或12月;土壤呼吸速率的年均值为加倍凋落物对照去除根系去除凋落物,不同改变碳输入方式均降低了土壤呼吸的Q10值;矿质土壤呼吸、凋落物呼吸和根系呼吸对土壤总呼吸的贡献分别为41.24%、43.29%和15.45%;不同处理土壤呼吸速率分别与土壤温度和湿度呈显著的指数和线性正相关(P0.05),双因子模型能解释土壤呼吸变异的45%~69%;改变碳输入影响土壤可溶性有机碳和微生物生物量碳,不同处理土壤呼吸速率与可溶性有机碳和微生物生物量碳呈正相关。因此,改变碳输入引起土壤易变碳的变化进而影响土壤呼吸。
[Abstract]:Soil respiration is an important process of terrestrial ecosystem carbon cycle. It is important to study the effects of environmental factors and carbon input on soil respiration. The effects of changing carbon input on soil respiration were continuously observed by LI-8100 in typical natural secondary forest of subtropical coastal sandy land with four treatments of removing root, removing litter, doubling litter and contrast. The results showed that changing carbon input had no significant effect on 10cm soil temperature and moisture (P0.05), and the soil respiration rate of different treatments had obvious seasonal variation, which was low in summer and winter, and the maximum appeared in May or June. The minimum value appeared in November or December, the annual mean of soil respiration rate was double litter control, root removal, different carbon input mode decreased the Q10 value of soil respiration, mineral soil respiration, The contribution of litter respiration and root respiration to total soil respiration was 41.2429% and 15.45%, respectively, and soil respiration rate of different treatments was positively correlated with soil temperature and moisture (P0.05). The two-factor model could explain soil respiration. Changing carbon input affects soil soluble organic carbon and microbial biomass carbon, Soil respiration rates of different treatments were positively correlated with soluble organic carbon and microbial biomass carbon. Therefore, the change of carbon input leads to the change of soil volatile carbon, which affects soil respiration.
【作者单位】：湿润亚热带山地生态国家重点实验室培育基地;福建师范大学地理研究所;福建省林业科学研究院;湿润亚热带生态地理过程教育部重点实验室;福建农林大学林学院;
【基金】：国家自然科学基金“亚热带人工林树种对土壤氮吸收和转化的影响”(41371269);“亚热带森林土壤氮梯度、植物养分与土壤有机质来源变化耦合关系”(31570604) 福建省属公益类科研院所基本科研专项“滨海沙地造林树种转换对土壤碳循环的影响”(2014R1011-7) 福建省森林培育与林产品加工利用重点实验室福建省木麻黄工程技术研究中心资助
【分类号】：S714

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