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  本文關(guān)鍵詞： 五臺山 水穩(wěn)性團(tuán)聚體 顆粒有機(jī)碳 礦物結(jié)合有機(jī)碳　出處：《水土保持學(xué)報(bào)》2017年04期 　論文類型：期刊論文

【摘要】：為揭示五臺山垂直帶土壤不同形態(tài)團(tuán)聚體有機(jī)碳的分布特征,以五臺山垂直帶土壤為研究對象,于2016年8月從高海拔至低海拔對亞高山草甸土、山地草甸土、棕壤、淋溶褐土、石灰性褐土樣品進(jìn)行采集,并且通過濕篩法和物理分組技術(shù)獲得不同土壤類型中2,2~0.25,0.25~0.053,0.053mm水穩(wěn)性團(tuán)聚體,進(jìn)一步分析了土壤及各級水穩(wěn)性團(tuán)聚體的總有機(jī)碳、顆粒有機(jī)碳(POC)和礦物結(jié)合有機(jī)碳(MOC)。結(jié)果表明:亞高山草甸土、山地草甸土和棕壤均以2mm團(tuán)聚體為最多,達(dá)到總水穩(wěn)性團(tuán)聚體的45.13%。然而,淋溶褐土和石灰性褐土中分別以2~0.25mm和0.25~0.053mm團(tuán)聚體為最多,分別達(dá)到33.79%和39.95%。隨著海拔高度的降低土壤有機(jī)碳含量依次降低,且不同土壤類型中,2mm和2~0.25mm團(tuán)聚體有機(jī)碳含量與其對應(yīng)的土壤有機(jī)碳含量呈極顯著正相關(guān)關(guān)系,相關(guān)系數(shù)分別為r2mm=0.986和r2~0.25mm=0.966(P0.01)。隨著土壤團(tuán)聚體粒徑的減小,亞高山草甸土、山地草甸土、棕壤的POC含量呈現(xiàn)下降趨勢,而淋溶褐土和石灰性褐土的POC含量呈現(xiàn)升高趨勢。亞高山草甸土、山地草甸土、棕壤的MOC含量都以2mm團(tuán)聚體為最大,淋溶褐土和石灰性褐土分別以2~0.25mm和0.25~0.053mm團(tuán)聚體的MOC含量為最大。各土壤及團(tuán)聚體中MOC的含量要明顯大于POC的含量,而且在土壤和各級大團(tuán)聚體中二者呈現(xiàn)正相關(guān)關(guān)系(P0.05)。此外,各土壤POC和MOC的含量與土壤有機(jī)碳含量也呈現(xiàn)正相關(guān)關(guān)系(P0.05)。因此,隨著海拔高度的降低,各土壤團(tuán)聚體組成由大團(tuán)聚體向微團(tuán)聚體轉(zhuǎn)變,亞高山草甸土、山地草甸土、棕壤的碳截獲能力強(qiáng)于淋溶褐土和石灰性褐土。
[Abstract]:In order to reveal the distribution characteristics of organic carbon in soil aggregates of different forms in the vertical zone of Wutai Mountain, the soil in the vertical zone of Wutai Mountain was studied from high altitude to low altitude in August 2016 to subalpine meadow soil. The samples of mountain meadow soil, brown soil, leached cinnamon soil and calcareous cinnamon soil were collected, and different soil types were obtained by wet sieve method and physical grouping technique. The total organic carbon of soil and water stable aggregates of different levels were further analyzed by 0.053mm water stable aggregates. The results showed that the subalpine meadow soil, mountain meadow soil and brown soil had the most 2mm aggregates. 45.13% of the total water-stable aggregates were obtained. However, the most common aggregates in leached cinnamon soil and calcareous cinnamon soil were 0.25mm and 0.250.53mm, respectively, in leached cinnamon soil and calcareous cinnamon soil. It reached 33.79% and 39.95, respectively. With the decrease of altitude, the content of soil organic carbon decreased in turn, and in different soil types. The content of organic carbon in 2mm and 0.25mm aggregates was positively correlated with the corresponding soil organic carbon content. The correlation coefficients were r _ 2mm ~ (0.986) and r _ (2) ~ (0.25) mm ~ (-1) ~ 0.966p _ (0.01), respectively. With the decrease of soil aggregate size, subalpine meadow soil and mountain meadow soil were found to be subalpine meadow soil and mountainous meadow soil. The POC content of brown soil decreased while that of leached cinnamon soil and calcareous cinnamon soil increased. The MOC content of brown soil was the highest in 2mm aggregate. The content of MOC in leaching cinnamon soil and calcareous cinnamon soil was the highest in 0.25mm and 0.255mm aggregate, respectively. The MOC content in each soil and aggregates was obviously higher than that in POC soil. Content. In addition, there was a positive correlation between soil and macroaggregates. There was a positive correlation between the contents of POC and MOC and the content of soil organic carbon. Therefore, with the decrease of altitude, the contents of POC and MOC were positively correlated with the content of soil organic carbon. The composition of soil aggregates changed from large aggregates to microaggregates. The carbon interception ability of subalpine meadow soil, mountain meadow soil and brown soil was stronger than that of leached cinnamon soil and calcareous cinnamon soil.
【作者單位】： 山西農(nóng)業(yè)大學(xué)資源環(huán)境學(xué)院;山西農(nóng)業(yè)大學(xué)農(nóng)業(yè)資源與環(huán)境國家級實(shí)驗(yàn)教學(xué)示范中心;
【基金】：山西省科技攻關(guān)項(xiàng)目(20120313011-1)
【分類號】：S152.4
【正文快照】： 土壤是陸地最大的有機(jī)碳庫,含碳量大約2 400Pg(深2m),是目前大氣中二氧化碳含碳量的3倍和年平均化石燃料排放量的240倍[1],土壤有機(jī)碳的固存對全球氣候的改善至關(guān)重要。土壤團(tuán)聚體是土粒通過各種自然過程的作用而形成的直徑10mm的基本結(jié)構(gòu)單元,對土壤的基本理化性質(zhì)有較大的

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