本文選題：干旱荒漠區(qū)　切入點：白刺灌叢　出處：《西北林學(xué)院學(xué)報》2017年05期

【摘要】：為了研究干旱荒漠區(qū)不同演替階段白刺土壤呼吸特征,探討土壤呼吸對環(huán)境因子變化的響應(yīng),采用自動土壤二氧化碳通量監(jiān)測系統(tǒng),測定了不同演替階段(雛形、穩(wěn)定、發(fā)育、衰退)白刺灌叢沙堆的土壤呼吸速率,同步測定了土壤溫度、水分等指標(biāo),分析了環(huán)境因子與土壤呼吸之間的關(guān)系。結(jié)果表明:1)不同演替階段白刺灌叢沙堆土壤呼吸變化呈"單峰曲線"。土壤呼吸速率均值按大小順序排列為穩(wěn)定階段雛形階段發(fā)育階段衰退階段;2)4種演替階段土壤呼吸速率與10cm處土壤溫度之間有一定的相關(guān)關(guān)系,對白刺灌叢沙堆土壤溫度可以解釋雛形70.16%、發(fā)育82.67%、穩(wěn)定87.81%、衰退88.73%的土壤呼吸變化;3)隨著水分的增加,土壤呼吸速率也相應(yīng)的增大,當(dāng)土壤水分達到最高時,水分的限制作用減小,水分增加對土壤呼吸的促進作用減弱;4)各發(fā)育階段不同坡位土壤呼吸日變化動態(tài)存在差異,但平均值都表現(xiàn)為迎風(fēng)坡中部迎風(fēng)坡底部迎風(fēng)坡頂部背風(fēng)坡中部背風(fēng)坡底部。對不同演替階段白刺灌叢沙堆土壤呼吸及其影響因素的研究有助于認(rèn)識區(qū)域生態(tài)過程和全球氣候變化。
[Abstract]:In order to study the characteristics of soil respiration in different succession stages and the response of soil respiration to environmental factors in arid desert region, the automatic soil carbon dioxide flux monitoring system was used to determine the different succession stages (embryonic shape, stability and development). The soil respiration rate of the Spurs shrub sandpile was measured simultaneously with soil temperature, moisture, etc. The relationship between environmental factors and soil respiration was analyzed. The results showed that the variation of soil respiration in different succession stages of Nitraria thunbergii showed a "single peak curve", and the mean value of soil respiration rate was arranged in order of magnitude and order as the embryonic shape of stable stage. There was a certain correlation between soil respiration rate and soil temperature in 10cm. The soil temperature of the Sand pile can explain the embryonic form of 70.16, develop 82.67, stabilize 87.81, decline 88.73% of the soil respiration.) with the increase of water, the soil respiration rate increases, and when the soil moisture reaches the maximum, the limiting effect of soil moisture decreases. (4) the diurnal changes of soil respiration in different slope positions were different in different development stages. But the average value is the bottom of the middle leeward slope in the middle of the windward slope. The study on the soil respiration and its influencing factors of the Spurs shrub sandpile in different succession stages is helpful to understand the regional ecological overpass. Cheng and global climate change.
【作者單位】： 甘肅省治沙研究所/甘肅河西走廊森林生態(tài)系統(tǒng)國家定位觀測研究站定位研究站/甘肅省荒漠化與風(fēng)沙災(zāi)害防治國家重點實驗室培育基地/甘肅民勤荒漠草地生態(tài)系統(tǒng)國家野外科學(xué)觀測研究站;
【基金】：國家自然科學(xué)青年基金項目“干旱區(qū)白刺灌叢沙堆發(fā)育過程的土壤呼吸時空變化特征及其影響因素”(31300595)
【分類號】：S714

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