地表凋落物對(duì)油松、沙棘人工林土壤呼吸的影響
發(fā)布時(shí)間：2018-11-21 10:30
【摘要】：通過(guò)對(duì)黃土丘陵區(qū)油松、沙棘人工林自然組(含凋落物)和去凋組(不含凋落物)土壤呼吸、5cm土壤溫度和含水量的監(jiān)測(cè),研究地表凋落物對(duì)土壤呼吸的影響。在兩種林分內(nèi)分別設(shè)置20m×20m樣地,樣地內(nèi)隨機(jī)設(shè)置5個(gè)觀測(cè)點(diǎn),于2015年6月到2016年5月使用LI-8100系統(tǒng)進(jìn)行監(jiān)測(cè)。結(jié)果表明:(1)自然組油松林和沙棘林土壤呼吸季節(jié)動(dòng)態(tài)及日動(dòng)態(tài)均表現(xiàn)為單峰型變化曲線,沙棘土壤呼吸年均值[2.10μmol/(m~2·s)]顯著高于油松[1.56μmol/(m~2·s),p0.05];去除凋落物后,兩種林分土壤呼吸與自然組具有相似的季節(jié)及日動(dòng)態(tài)特征,但土壤呼吸年均值不存在顯著性差異。(2)沙棘林自然組土壤呼吸年均值顯著高于去凋組[1.58μmol/(m~2·s),p0.05],凋落物呼吸對(duì)土壤總呼吸的貢獻(xiàn)率為15.81%;油松林自然組與去凋組土壤呼吸年均值差異不顯著,凋落物呼吸對(duì)土壤總呼吸的貢獻(xiàn)率僅為1.61%。(3)自然組和去凋組中油松、沙棘林土壤呼吸與溫度均存在顯著指數(shù)關(guān)系(p0.05),與含水量則存在顯著線性負(fù)相關(guān)關(guān)系(p0.05);兩組處理土壤溫度和含水量對(duì)土壤呼吸的單獨(dú)解釋量均較低(0.05%~37.82%),土壤呼吸主要受到溫度和含水量共同作用的影響(8.01%~66.44%)。地表凋落物顯著提高了沙棘林土壤呼吸的Q10和土壤呼吸量,但僅顯著提高了油松林的Q10,對(duì)土壤呼吸量并未顯著增加。油松林作為黃土丘陵區(qū)水土保持及生態(tài)恢復(fù)的造林樹(shù)種更有利于該地區(qū)林地碳匯功能的提升。
[Abstract]:The effect of surface litter on soil respiration was studied by monitoring soil respiration, 5cm soil temperature and water content in natural group (including litter) and deregulation group (without litter) of Pinus tabulaeformis, Hippophae rhamnoides plantation in loess hilly region. 20m 脳 20m plots were set up in the two forest plots, and 5 observation points were randomly set up in the sample plots. LI-8100 system was used to monitor the plots from June 2015 to May 2016. The results showed that: (1) the seasonal and diurnal dynamics of soil respiration in natural group Pinus tabulaeformis and Hippophae rhamnoides forest showed a single peak variation curve. The annual mean of soil respiration of Hippophae rhamnoides [2.10 渭 mol/ (mt2 s)] was significantly higher than that of Pinus tabulaeformis [1.56 渭 mol/ (mt2 s), p0.05)]. After litter removal, soil respiration of the two stands had similar seasonal and daily dynamic characteristics as those of natural groups. But there was no significant difference in the annual mean of soil respiration. (2) the annual mean of soil respiration in the natural group of Hippophae rhamnoides forest was significantly higher than that in the control group [1.58 渭 mol/ (mt2 s), p0.05)], and the contribution rate of litter respiration to total soil respiration was 15.81%. There was no significant difference in annual mean of soil respiration between natural group and deregulation group in Pinus tabulaeformis forest. The contribution rate of litter respiration to soil total respiration was only 1.61%. (3) Pinus tabulaeformis var. tabulaeformis in natural group and unwithered group. There was a significant exponential relationship between soil respiration and temperature (p0.05) and a significant linear and negative correlation (p0.05) between soil respiration and water content in Hippophae rhamnoides forest. The single interpretation of soil temperature and water content to soil respiration in both groups was lower (0.05%, 37.82%), and soil respiration was mainly affected by the interaction of temperature and water content (8.01%, 66.44%). Surface litter significantly increased soil respiration Q10 and soil respiration in Hippophae rhamnoides forest, but only significantly increased Q10 in Pinus tabulaeformis forest, but did not significantly increase soil respiration. Pinus tabulaeformis forest as an afforestation tree species for soil and water conservation and ecological restoration in loess hilly region is more conducive to the enhancement of carbon sink function of forest land in this area.
【作者單位】： 中國(guó)科學(xué)院教育部水土保持與生態(tài)環(huán)境研究中心;西北農(nóng)林科技大學(xué)水土保持研究所;西北農(nóng)林科技大學(xué)林學(xué)院;
【基金】：國(guó)家自然科學(xué)基金“黃土丘陵區(qū)油松和沙棘人工林的水分來(lái)源變化及其生理響應(yīng)研究”(41501576) 公益性行業(yè)(國(guó)家氣象局)科研專項(xiàng)(重大專項(xiàng))“干旱氣象科學(xué)研究—我國(guó)北方干旱致災(zāi)過(guò)程及機(jī)理”(GYHY2015060013)
【分類號(hào)】：S714
[Abstract]:The effect of surface litter on soil respiration was studied by monitoring soil respiration, 5cm soil temperature and water content in natural group (including litter) and deregulation group (without litter) of Pinus tabulaeformis, Hippophae rhamnoides plantation in loess hilly region. 20m 脳 20m plots were set up in the two forest plots, and 5 observation points were randomly set up in the sample plots. LI-8100 system was used to monitor the plots from June 2015 to May 2016. The results showed that: (1) the seasonal and diurnal dynamics of soil respiration in natural group Pinus tabulaeformis and Hippophae rhamnoides forest showed a single peak variation curve. The annual mean of soil respiration of Hippophae rhamnoides [2.10 渭 mol/ (mt2 s)] was significantly higher than that of Pinus tabulaeformis [1.56 渭 mol/ (mt2 s), p0.05)]. After litter removal, soil respiration of the two stands had similar seasonal and daily dynamic characteristics as those of natural groups. But there was no significant difference in the annual mean of soil respiration. (2) the annual mean of soil respiration in the natural group of Hippophae rhamnoides forest was significantly higher than that in the control group [1.58 渭 mol/ (mt2 s), p0.05)], and the contribution rate of litter respiration to total soil respiration was 15.81%. There was no significant difference in annual mean of soil respiration between natural group and deregulation group in Pinus tabulaeformis forest. The contribution rate of litter respiration to soil total respiration was only 1.61%. (3) Pinus tabulaeformis var. tabulaeformis in natural group and unwithered group. There was a significant exponential relationship between soil respiration and temperature (p0.05) and a significant linear and negative correlation (p0.05) between soil respiration and water content in Hippophae rhamnoides forest. The single interpretation of soil temperature and water content to soil respiration in both groups was lower (0.05%, 37.82%), and soil respiration was mainly affected by the interaction of temperature and water content (8.01%, 66.44%). Surface litter significantly increased soil respiration Q10 and soil respiration in Hippophae rhamnoides forest, but only significantly increased Q10 in Pinus tabulaeformis forest, but did not significantly increase soil respiration. Pinus tabulaeformis forest as an afforestation tree species for soil and water conservation and ecological restoration in loess hilly region is more conducive to the enhancement of carbon sink function of forest land in this area.
【作者單位】： 中國(guó)科學(xué)院教育部水土保持與生態(tài)環(huán)境研究中心;西北農(nóng)林科技大學(xué)水土保持研究所;西北農(nóng)林科技大學(xué)林學(xué)院;
【基金】：國(guó)家自然科學(xué)基金“黃土丘陵區(qū)油松和沙棘人工林的水分來(lái)源變化及其生理響應(yīng)研究”(41501576) 公益性行業(yè)(國(guó)家氣象局)科研專項(xiàng)(重大專項(xiàng))“干旱氣象科學(xué)研究—我國(guó)北方干旱致災(zāi)過(guò)程及機(jī)理”(GYHY2015060013)
【分類號(hào)】：S714
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