应用高频观测探讨不同森林经营方式下矿质土壤呼吸的昼夜动态特征

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 应用高频观测探讨不同森林经营方式下矿质土壤呼吸的昼夜动态特征 DOI: 10.5846/stxb201608191698 作者: 作者单位: 福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地,三明市三元区林业局,福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金重点资助项目（31130013）；国家自然科学基金资助项目（31500407）；福建省教育厅B类科技资助项目（JB14025） High-frequency analysis of the diel patterns of mineral soil respiration under different forest management Author: Affiliation: College of Geographical Science,Fujian Normal University; State Key Laboratory of Subtropical Mountain Ecology(Funded by Ministry of Science and Technology and Fujian Province),College of Geographical Science,Fujian Normal University; State Key Laboratory of Subtropical Mountain Ecology(Funded by Ministry of Science and Technology and Fujian Province),,,,,,,, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:矿质土壤呼吸是森林生态系统土壤碳库损失的重要途径之一，也是森林生态系统碳（C）平衡估算中的关键因子。了解矿质土壤呼吸在不同时间尺度上的变化，对理解森林生态系统C循环应对全球变化的响应至关重要，而高频观测是探讨矿质土壤呼吸在不同时间尺度变化的重要手段之一。通过高频自动观测系统与Li-8100土壤CO2通量测量系统，对福建省三明市陈大镇国有林场的米槠（Castanopsis carlesii）次生林在不同森林经营方式下（CK对照，RR皆伐，RB火烧）的矿质土壤呼吸与土壤温度和含水量的昼夜动态进行分析，并比较2种采样策略下矿质土壤呼吸的年、日均通量差异。结果表明：1）不同森林经营方式的矿质土壤呼吸与土壤温度和土壤含水量均存在着明显的季节动态，矿质土壤呼吸速率年均值表现为CK（2.18 μmol m-2 s-1） > RB（1.93 μmol m-2 s-1） > RR（1.89 μmol m-2 s-1）。2）在不同森林经营方式下，采用手动观测的矿质土壤呼吸年平均日通量显著低于高频观测结果，而采用高频观测09：00-11：00时间段内观测数据计算日通量与高频自动观测系统全天（24h）结果无显著差异；3）不同森林经营方式下的林地，土壤水热条件的变化是影响矿质土壤呼吸的重要因素之一。双因子模型拟合结果表明，土壤温度和含水量共同解释了CK、RR和RB矿质土壤呼吸速率的年变化的96.8%，62.8%，95.4%，拟合结果明显优于以温度为单因子的指数模型。因此，未来气候变化背景下，为准确评估和预测不同森林经营方式对土壤与大气间碳通量交换的影响，采用高频自动观测技术观测矿质土壤呼吸，将有利于提高碳通量估算精度。 Abstract:Mineral soil respiration is an important route for the loss soil carbon (C) in forest ecosystems, and it is a key factor for estimating the forest ecosystem carbon balance. Making sense of mineral soil respiration variation on temporal and spatial scales is a critical component of understanding forest ecosystem C cycle responses to climate change. Thus, high-frequency measurements have become one of the primary tools used to measure mineral soil respiration on both temporal and spatial scales. The objective of this study was to compare a manual system (Li-8100A) with an automated system for measuring mineral soil respiration in a subtropical forest. We carried out the study in a secondary Castanopsis carlesii forest with different forest management (Control, CK; Residual retention after clear cutting, RR; Residual burning after clear cutting, RB) in Sanming, Fujian. The results obtained were as follows. (1) The mineral soil respiration flux, soil temperature, and soil moisture content under different forest managements all showed obvious seasonal dynamics, and mineral soil respiration rates were in the order of CK (2.18 μmol m-2 s-1) > RB (1.93 μmol m-2 s-1) > RR (1.89 μmol m-2 s-1). (2) The annual flux determined using high-frequency measurement was significantly higher than that determined using the manual system, whereas there was no difference between the soil respiration rate calculated between 09:00 and 11:00 (high-frequency data) for different forest managements. (3) Soil hydrothermal condition is one of the important factors affecting mineral soil respiration under different forest management. A two-factor model show that included soil temperature and moisture explained the annual variation of mineral soil respiration rate as 96.8%, 62.8% and 95.4% in CK, RR, and RB treatments, respectively. The double factors model demonstrated that combined with soil temperature and moisture was explained the annual variation of mineral soil respiration rate 96.8%, 62.8% and 95.4% in CK, RR and RB, respectively. The results obtained using this model were better than those obtained using a single-factor model. Therefore, in order to accurately assess and predict the effects of different forest management on the C flux exchange between the soil and atmosphere under future climate change, high-frequency measurements should be considered. 参考文献 相似文献 引证文献