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土壤類型對(duì)優(yōu)先流路徑和磷形態(tài)影響的定量評(píng)價(jià)
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國(guó)家自然科學(xué)基金面上項(xiàng)目(41272200)和國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC0502401)


Quantitative Evaluation of Effect of Soil Types on Preferential Flow Pathways and Soil Phosphorus Forms
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    摘要:

    以中國(guó)貢嘎山由青灰色砂質(zhì)冰水堆積物發(fā)育而成的疏松巖性土壤和德國(guó)厄爾士山漬水土壤優(yōu)先流路徑為研究對(duì)象,通過野外染色示蹤試驗(yàn)和改進(jìn)的Hedley磷形態(tài)提取法,使用優(yōu)先流染色面積比和優(yōu)先流程度評(píng)價(jià)指數(shù)定量評(píng)價(jià)不同類型土壤的優(yōu)先流程度,通過相關(guān)關(guān)系分析進(jìn)一步揭示不同土壤類型中優(yōu)先流路徑對(duì)磷形態(tài)分布的影響。結(jié)果表明:貢嘎山和厄爾士山優(yōu)先流圖片總?cè)旧娣e比分別為31%和52%,厄爾士山漬水土優(yōu)先流比貢嘎山疏松巖性土發(fā)育較好。貢嘎山疏松巖性土壤優(yōu)先流發(fā)育程度與潛在生物可利用無機(jī)磷和有機(jī)磷貢獻(xiàn)率顯著正相關(guān),而即時(shí)生物有效無機(jī)磷和磷灰石磷與厄爾士山漬水土壤優(yōu)先流發(fā)育程度顯著正相關(guān)。土壤類型影響優(yōu)先流路徑分布和土壤磷形態(tài)分布,從而影響土壤磷賦存狀況和下游水質(zhì)安全。

    Abstract:

    With the development of earth’s critical zone, the crucial hydropedological problems are needed to be solved. The quantitative expression of preferential flow and soil structure and stratification, water flow in situ and solute transport is the key research to the earth’s critical zone. Phosphorus loss from soils and water flow has been a vital water quality issue because of the critical role that phosphorus plays in eutrophication. Preferential flow pathways (PFPs) are one of main factors that affect subsurface phosphorus transport, which are the direct connections between soil surface and groundwater. The phosphorus fractions of two types of soil, Regosols from Gongga Mountain and Stagnosol from Ore Mountain, were investigated by using the modified Hedley sequential phosphorus extraction method. Regosols in Gongga Mountain was developed by the moraine colonization by plants in the relatively mild and humid climate. PFPs were identified by the dye tracer experiments using brilliant blue FCF. The tracerinfiltration patterns were parameterized by dye coverage ratio (Dc) and evaluation index of PFPs (Cv). The impact of PFPs on the distribution of phosphorus fractions was evaluated by the Pearson correlations and T-test. The results indicated that dye coverages of Regosols from Gongga Mountain and Stagnosol from Ore Mountain were 31% and 52%, respectively. The degree of preferential flow in Ore Mountain Stagnosol soil was tended to be larger than that in Regosols soil from Gongga Mountain;PFPs in Gongga Mountain were important contributors to the potential bioavailable inorganic phosphorus (PBPi) and organic phosphorus load, while PFPs in Ore Mountain were important contributors to the readily bioavailable inorganic phosphorus (RBPi). In conclusion, the results showed that soil types could affect both the infiltration patterns of PFPs and the transfer process of phosphorus fractions.

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梁建宏,吳艷宏,周俊,王吉鵬,王曉曉,李睿.土壤類型對(duì)優(yōu)先流路徑和磷形態(tài)影響的定量評(píng)價(jià)[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2017,48(1):220-227. LIANG Jianhong, WU Yanhong, ZHOU Jun, WANG Jipeng, WANG Xiaoxiao, LI Rui. Quantitative Evaluation of Effect of Soil Types on Preferential Flow Pathways and Soil Phosphorus Forms[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(1):220-227.

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  • 收稿日期:2016-05-09
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  • 在線發(fā)布日期: 2017-01-10
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