本文選題：土壤物理性質(zhì)　切入點(diǎn)：土壤鹽漬化　出處：《水土保持學(xué)報(bào)》2017年04期 　論文類型：期刊論文

【摘要】：通過網(wǎng)格布點(diǎn)法對(duì)渭北地區(qū)農(nóng)田土壤進(jìn)行采樣分析,研究了土壤團(tuán)聚體、土壤容重、土壤質(zhì)地對(duì)土壤剖面鹽分的影響。結(jié)果表明:(1)研究區(qū)輕度鹽漬化面積占46.56%,中度鹽漬化占23.01%,渭北地區(qū)農(nóng)田土壤鹽漬化程度總體不嚴(yán)重但存在較大潛在風(fēng)險(xiǎn)。(2)各層土壤水穩(wěn)性團(tuán)聚體與含鹽量呈負(fù)相關(guān),容重與含鹽量的關(guān)系因鹽漬化程度不同而在各土層表現(xiàn)出不同的正負(fù)效應(yīng),土壤質(zhì)地與含鹽量?jī)H在0—20cm土層存在顯著相關(guān)性。(3)土壤物理性質(zhì)對(duì)含鹽量的異位影響與含鹽量水平有關(guān)。當(dāng)土壤含鹽量1g/kg時(shí),40—60cm容重與20—40cm含鹽量為冪函數(shù)關(guān)系,且呈遞增趨勢(shì);土壤含鹽量在2~4g/kg時(shí),20—40cm容重與0—20cm含鹽量為一次函數(shù)關(guān)系,且呈遞增趨勢(shì);當(dāng)含鹽量2g/kg時(shí),0—20cm容重與20—40cm含鹽量為一次函數(shù)關(guān)系,且呈遞減趨勢(shì);含鹽量2g/kg時(shí),水穩(wěn)性團(tuán)聚體與含鹽量呈顯著線性負(fù)相關(guān)。
[Abstract]:Soil aggregates and bulk density were studied by sampling and analyzing farmland soil in Weibei area by grid distribution method. The effect of soil texture on the salinity of soil profile. The results show that the area of slight salinization is 46.56, moderate salinization is 23.01, soil salinization is not serious in Weibei area, but there is a great potential risk. Soil water stable aggregates were negatively correlated with salt content. The relationship between bulk density and salt content showed different positive and negative effects in different soil layers because of the different salinization degree. There was significant correlation between soil texture and salt content only in 0-20cm soil layer. (3) the heterotopic effect of soil physical properties on salt content was related to the salt content level. When the soil salt content was 1 g / kg, the bulk weight of 40 ~ 60cm and the salt content of 20-40 cm were power function, and showed an increasing trend. When the salt content of soil is 2g / kg, the bulk density of 20-40cm and the salt content of 0-20cm is a function of the first order, and it is an increasing trend; when the salt content is 2g / kg, the bulk weight of 0-20cm and the salt content of 20-40cm are primary function, and the salinity content is 2g / kg. There was a significant linear negative correlation between water stable aggregates and salt content.
【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)林學(xué)院;西北農(nóng)林科技大學(xué)資源與環(huán)境學(xué)院;
【基金】：中國(guó)科學(xué)院重點(diǎn)部署項(xiàng)目(KJZD-EW-TZ-G10) 科技基礎(chǔ)性工作專項(xiàng)(2014FY210100)
【分類號(hào)】：S156.4

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