【摘要】：礦質土壤呼吸是森林生態(tài)系統(tǒng)土壤碳庫損失的重要途徑之一,也是森林生態(tài)系統(tǒng)碳(C)平衡估算中的關鍵因子。了解礦質土壤呼吸在不同時間尺度上的變化,對理解森林生態(tài)系統(tǒng)C循環(huán)應對全球變化的響應至關重要,而高頻觀測是探討礦質土壤呼吸在不同時間尺度變化的重要手段之一。通過高頻自動觀測系統(tǒng)與Li-8100土壤CO2通量測量系統(tǒng),對福建省三明市陳大鎮(zhèn)國有林場的米櫧(Castanopsis carlesii)次生林在不同森林經營方式下(CK對照,RR皆伐,RB火燒)的礦質土壤呼吸與土壤溫度和含水量的晝夜動態(tài)進行分析,并比較2種采樣策略下礦質土壤呼吸的年、日均通量差異。結果表明:1)不同森林經營方式的礦質土壤呼吸與土壤溫度和土壤含水量均存在著明顯的季節(jié)動態(tài),礦質土壤呼吸速率年均值表現為CK(2.18μmol m~(-2)s~(-1))RB(1.93μmol m~(-2)s~(-1))RR(1.89μmol m~(-2)s~(-1))。2)在不同森林經營方式下,采用手動觀測的礦質土壤呼吸年平均日通量顯著低于高頻觀測結果,而采用高頻觀測09:00—11:00時間段內觀測數據計算日通量與高頻自動觀測系統(tǒng)全天(24h)結果無顯著差異;3)不同森林經營方式下的林地,土壤水熱條件的變化是影響礦質土壤呼吸的重要因素之一。雙因子模型擬合結果表明,土壤溫度和含水量共同解釋了CK、RR和RB礦質土壤呼吸速率的年變化的96.8%,62.8%,95.4%,擬合結果明顯優(yōu)于以溫度為單因子的指數模型。因此,未來氣候變化背景下,為準確評估和預測不同森林經營方式對土壤與大氣間碳通量交換的影響,采用高頻自動觀測技術觀測礦質土壤呼吸,將有利于提高碳通量估算精度。
[Abstract]:Mineral soil respiration is one of the important ways of soil carbon pool loss in forest ecosystem, and it is also a key factor in estimating carbon (C) balance in forest ecosystem. Understanding the changes of mineral soil respiration at different time scales is very important to understand the response of forest ecosystem C cycle to global change, and high frequency observation is one of the important means to explore the variation of mineral soil respiration at different time scales. By means of high frequency automatic observation system and Li-8100 soil CO2 flux measurement system, the secondary forest of Castanopsis carlesii (Castanopsis carlesii) in state-owned forest farm of Chenda Town, Sanming City, Fujian Province, was studied under different forest management modes (CK control, RR clear cutting). The diurnal dynamics of mineral soil respiration, soil temperature and water content were analyzed, and the daily mean fluxes of mineral soil respiration under two sampling strategies were compared. The results showed that: 1) the mineral soil respiration, soil temperature and soil water content of different forest management methods had obvious seasonal dynamics. The annual mean respiration rate of mineral soil was CK (2.18 渭 mol m2) s-1) RB (1.93 渭 mol m-2 s-1) RR (1.89 渭 mol m-2 s-1). 2 under different forest management patterns. The annual average daily flux of respiration of mineral soil by manual observation is significantly lower than that of high frequency observation. However, there is no significant difference between the daily flux calculated by using the high frequency observation data in the period of 09: 00-11: 00 and the results of the high frequency automatic observation system in the whole day (24 hours). 3) the change of soil water and heat condition is one of the important factors that influence the respiration of mineral soil in different forest management mode. The fitting results of two-factor model showed that soil temperature and water content explained the annual variation of respiration rate of mineral soil in CK,RR and RB. The fitting results are obviously superior to the exponential model with temperature as a single factor. Therefore, in order to accurately assess and predict the effect of different forest management modes on carbon flux exchange between soil and atmosphere, high-frequency automatic observation technology is used to observe mineral soil respiration in the future climate change background. It will help to improve the accuracy of carbon flux estimation.
【作者單位】： 福建師范大學地理科學學院;福建師范大學濕潤亞熱帶山地生態(tài)國家重點實驗室培育基地;三明市三元區(qū)林業(yè)局;
【基金】：國家自然科學基金重點資助項目(31130013);國家自然科學基金資助項目(31500407) 福建省教育廳B類科技資助項目(JB14025)
【分類號】：S714

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