本文關(guān)鍵詞： 海泡石 土壤團(tuán)聚體 有機(jī)碳 穩(wěn)定性　出處：《水土保持學(xué)報(bào)》2017年06期 　論文類型：期刊論文

【摘要】：通過大田試驗(yàn),研究了在鎘污染菜地原位鈍化修復(fù)過程中海泡石對(duì)土壤團(tuán)聚體組成和穩(wěn)定性以及有機(jī)碳含量影響。結(jié)果表明,與對(duì)照相比,施用海泡石后整體上減少了5~8mm和0.25mm級(jí)別團(tuán)聚體的數(shù)量,而2~5,1~2,0.5~1,0.25~0.5mm級(jí)別團(tuán)聚體數(shù)量則不同程度增加,且隨著海泡石施用量增加,其數(shù)量呈顯著增加(P0.05)。在0—15cm土層中,土壤團(tuán)聚體的平均質(zhì)量直徑(MWD)和幾何平均直徑(GMD)隨海泡石施加濃度增加呈現(xiàn)先增加后降低,而在15—20cm土層中則有所降低。施用低濃度海泡石(0.5%)時(shí),土壤有機(jī)碳(SOC)含量有所減少,最大降低了21.1%,而當(dāng)海泡石添加劑量達(dá)到1%(H_1)和1.5%(H_(1.5))后,土壤有機(jī)碳含量整體上有所提高,較對(duì)照相比,最大增幅分別達(dá)到2.9%和70.3%。與對(duì)照相比,施用海泡石后增加了大團(tuán)聚體中土壤有機(jī)碳的貢獻(xiàn)率。
[Abstract]:The effects of sepiolite on the composition, stability and organic carbon content of soil aggregates in the process of in situ passivation and remediation of cadmium contaminated vegetable fields were studied by field experiments. After application of sepiolite, the total number of agglomerates of 5mm and 0.25mm was reduced, while the amount of 2kW 5mm and 0.25mm was decreased, and the amount of the aggregates was decreased by 0.5mm and 0.25mm, respectively. The number of 0.25mm-grade aggregates increased in varying degrees, and with the application of sepiolite, the number of aggregates increased significantly in the 0-15cm soil layer. The mean mass diameters (MWD) and geometric mean diameters (GMDs) of soil aggregates increased first and then decreased with the increase of sepiolite concentration. The soil organic carbon (SOC) content decreased to 21.1% when low concentration sepiolite was applied in the soil layer of 15-20 cm. However, when the amount of sepiolite additive reached 1 / h / 1) and 1.5 / kg / kg), the soil organic carbon content increased as a whole, compared with the control. The maximum increases were 2.9% and 70.3, respectively. Compared with the control, the contribution rate of soil organic carbon in the large aggregate was increased after the application of sepiolite.
【作者單位】： 東北農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院;農(nóng)業(yè)部環(huán)境保護(hù)科研監(jiān)測所農(nóng)業(yè)部產(chǎn)地環(huán)境污染防控重點(diǎn)實(shí)驗(yàn)室;農(nóng)業(yè)部環(huán)境保護(hù)科研監(jiān)測所天津市農(nóng)業(yè)環(huán)境與農(nóng)產(chǎn)品安全重點(diǎn)實(shí)驗(yàn)室;
【基金】：公益性行業(yè)(農(nóng)業(yè))科研專項(xiàng)(201203045) 天津市自然科學(xué)基金重點(diǎn)項(xiàng)目(17JCZDJC34200) 中國農(nóng)科院基本科研業(yè)務(wù)費(fèi)專項(xiàng)院級(jí)統(tǒng)籌項(xiàng)目
【分類號(hào)】：S152.4;S153.6;X53
【正文快照】： 土壤團(tuán)聚體是土壤結(jié)構(gòu)的基本單元,是評(píng)價(jià)土壤肥力和質(zhì)量的主要指標(biāo),可以有效保障和協(xié)調(diào)土壤中的水肥氣熱、影響土壤酶的種類和活性以及維持和穩(wěn)定土壤結(jié)構(gòu)[1-3]。團(tuán)聚體的大小、組成、穩(wěn)定性等特征影響著土壤的持水性[4]、通透性[5]和抗蝕性[4,6]。土壤有機(jī)碳的數(shù)量和質(zhì)量與團(tuán)

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