本文關(guān)鍵詞： 土壤呼吸 切根 森林類型 土壤溫度 土壤濕度 Q_(10)值　出處：《中南林業(yè)科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在湖南省森林植物園對樟樹林、馬尾松林、楓香林及樟樹-馬尾松混交林4種森林類型采取了切根處理,對其土壤呼吸、土壤溫度、濕度進(jìn)行了為期la的定點(diǎn)觀測,分析了在不同處理條件下土壤呼吸與環(huán)境因子的動態(tài)特征,研究結(jié)果將對揭示亞熱帶森林生態(tài)系統(tǒng)碳通量及其驅(qū)動機(jī)制提供基礎(chǔ)數(shù)據(jù)。(1)自然條件下：4種森林類型土壤呼吸年動態(tài)呈單峰變化趨勢,最大值出現(xiàn)在6月,最小值出現(xiàn)在1月；土壤呼吸的年均值表現(xiàn)為：樟樹林(2.30±0.12μmolCO2m-2·s-1)樟樹-馬尾松混交林(2.03±0.15 μmolCO2m-2·s-1)楓香林(1.79±0.23 μmolCO2m-2·s-1)馬尾松林(1.62±0.17 μmolCO2m-2·s-1)土壤呼吸年累積C排放量表現(xiàn)出：樟樹林(31.92t·hm-2·a-1)樟樹-馬尾松混交林(28.16t·hm-2·a-1)楓香林(24.69 t·hm-2·a-1)馬尾松林(22.47 t·hm-2·a-1)樟樹林、樟樹-馬尾松混交林、楓香林、馬尾松林4種森林類型土壤呼吸Q10值分別為：1.73、1.43、1.54、1.58；4森林類型土壤呼吸速率與5 cm土壤溫度呈顯著指數(shù)相關(guān)(P0.01),回歸關(guān)系方程為R=aebt,其判定系數(shù)R2范圍是0.768-0.928；與5 cm土壤濕度無明顯相關(guān)性,線性回歸方程：R=a1W+b1其判定系數(shù)R2均在0.124-0.209之間。(2)切根處理條件下：4種森林類型土壤呼吸年動態(tài)亦呈單峰變化趨勢,最大值出現(xiàn)在6月,最小值出現(xiàn)在1月。土壤呼吸的年均值表現(xiàn)為：樟樹林(1.90±0.16樟樹-馬尾松混交林(1.74±0.13楓香林(1.49±0.15馬尾松林(1.36±0.11 μmolCO2m-2·s-1)土壤呼吸年累積C排放量表現(xiàn)出：樟樹林(26.36 t-hm-2·a-1)樟樹-馬尾松混交林(24.13 t·hm-2·a-1)楓香林(20.81 t·hm-2·a-1)馬尾松林(18.86 t·hm-2·a-1)。樟樹林、樟樹-馬尾松混交林、楓香林、馬尾松林4種森林類型土壤呼吸Q10值分別為：2.05、1.65、1.77、1.93；4森林類型土壤呼吸速率與5 cm土壤溫度呈顯著指數(shù)相關(guān)(P0.01),回歸關(guān)系方程為：R=aebt,其判定系數(shù)R2范圍是0.651-0.951；與5 cm土壤濕度無明顯相關(guān)性,線性回歸方程：R=aiW+bi其判定系數(shù)R2均在0.075-0.138之間。(3)切根處理均降低了4種森林類型土壤呼吸的速率,各月降幅為：樟樹林(7.22%-48.53%)、樟樹-馬尾松混交林(4.55%-38.62%)、楓香林(6.41%-40.34%)、馬尾松林(3.72%-54.51%),但并沒有改變其季節(jié)變化趨勢；切根處理降低了土壤呼吸年累積C排放量,樟樹林、樟樹-馬尾松混交林、楓香林、馬尾松林分別減低了17.41%、14.31%、15.71%和16.06%；切根條件下4種森林類型的Q10值均大于對照,增幅為：樟樹林18.50%、樟樹-馬尾松混交林15.38%、楓香林14.94%、馬尾松林22.15%；切根和對照條件下的土壤呼吸速率與土壤溫度顯著相關(guān)(P0.01),但在切根處理條件下,土壤呼吸速率與土壤溫度的相關(guān)性混交林(0.651)降低,純林(樟樹林0.951、楓香林0.850、馬尾松林0.894)升高；切根處理下土壤呼吸速率與土壤濕度相關(guān)性比自然條件下更低,切根和對照條件下土壤呼吸速率與土壤濕度的相關(guān)性均不顯著(P0.05)。
[Abstract]:In Hunan Forest Botanical Garden, four forest types, camphor forest, Masson pine forest, maple incense forest and mixed forest of camphor and Pinus massoniana, were treated by root cutting, and their soil respiration, soil temperature and humidity were observed for a period of time. The dynamic characteristics of soil respiration and environmental factors under different treatment conditions were analyzed. The results will provide basic data for revealing carbon flux and its driving mechanism of subtropical forest ecosystem. The annual mean value of soil respiration is 2.30 鹵0.12 渭 molCO2m-2 路s-1 for camphor tree and Masson pine mixed forest, 2.03 鹵0.15 渭 molCO2m-2 路s-1 for maple incense forest, 1.79 鹵0.23 渭 molCO2m-2 路s-1 for Pinus massoniana forest, and 1.62 鹵0.17 渭 molCO2m-2 路s-1 for soil respiration. The annual cumulative C emissions of soil respiration are 31.92 t 路hm-2 路a-1 in camphor forest and 28.16t 路hm-2 路a-1 in Pinus massoniana mixed forest. Pinus massoniana forest was 22.47 t 路hm-2 路a-1). Mixed forest of camphor and Masson pine, maple forest, The Q10 values of soil respiration in four forest types of Pinus massoniana forest were respectively: 1. 73C. 1. 4N, 1. 54-1. 584.There was a significant exponential correlation between soil respiration rate and 5 cm soil temperature (P 0. 01). The regression equation was Rhizoma aebt.The determination coefficient R2 was within the range of 0. 768-0. 928, and had no significant correlation with soil moisture at 5 cm. Under the condition of root cutting treatment, the annual dynamics of soil respiration of the four forest types showed a single peak trend, and the maximum value appeared in June, and the coefficient R2 of the linear regression equation was between 0.124-0.209 and 0.124-0.209, respectively. The minimum value of soil respiration occurred in January. The annual mean value of soil respiration was 1.90 鹵0.16 for camphor tree and Masson pine mixed forest, 1.74 鹵0.13 for Maple pine forest, 1.49 鹵0.15 for Pinus massoniana forest, 1.36 鹵0.11 渭 molCO2m-2 路s-1 for soil respiration, and the annual cumulative C emission of soil respiration was 26.36 t-hm-2 路a-1 for camphor forest. Pine mixed forest (24.13 t 路hm-2 路a-1) Maple incense forest (20.81 t 路hm-2 路a-1), Pinus massoniana forest (18.86 t 路hm-2 路a-1). Mixed forest of camphor and Masson pine, maple forest, The Q10 values of soil respiration in four forest types of Pinus massoniana forest were: 1. 055, 1. 771. 93, respectively. There was a significant exponential correlation between soil respiration rate and 5 cm soil temperature (P 0. 01), and the regression equation was: 1. 0. 0. 01-0. 951, and the determination coefficient R2 was 0. 651-0. 951. There was no significant correlation between the soil respiration rate and 5 cm soil moisture. The root cutting treatments of the linear regression equation Rnaiwbi, whose determination coefficients R2 were between 0.075 and 0.138, all reduced the soil respiration rate of four forest types. The monthly decrease was 7.22 -48.53%, 4.55% -38.62%, 6.41-40.341g, 3.72-54.51g and 3.72-54.51m, respectively, and the root cutting treatment decreased the annual cumulative C emissions of soil respiration, camphor forest, camphor tree and Masson pine mixed forest, but did not change the seasonal variation trend; cutting root treatment reduced the annual cumulative C emissions of soil respiration, camphor tree forest, camphor tree forest and Pinus massoniana mixed forest, and the root cutting treatment decreased the annual cumulative C emissions of soil respiration, the camphor forest, the camphor tree and the Pinus massoniana mixed forest. In maple forest and Masson pine forest, 17.41% and 16.06% were decreased, Q10 values of four forest types were all higher than that of control. The increase was 18.50 in camphor forest, 15.38in mixed camphor and Masson pine forest, 14.94in maple forest, 22.15m in Pinus massoniana forest. Soil respiration rate was significantly correlated with soil temperature under root cutting and control, but under root cutting treatment, soil respiration rate was significantly correlated with soil temperature. The correlation between soil respiration rate and soil temperature was 0.651), while that of pure forest (camphor forest 0.951, maple forest 0.850, Masson pine forest 0.894) was increased, and the correlation between soil respiration rate and soil moisture was lower under root cutting than that in natural condition. There was no significant correlation between soil respiration rate and soil moisture under root-cutting and control conditions.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S714

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