本文選題：喀斯特森林　切入點(diǎn)：群落類型　出處：《南京林業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年05期

【摘要】：【目的】探究喀斯特森林土壤氮礦化特征及供氮能力�！痉椒ā恳再F州喀斯特原生喬木林和次生林為研究對象,采用樹脂芯法,原位連續(xù)培養(yǎng)測定土壤氮礦化/硝化動態(tài)特征。【結(jié)果】(1)喀斯特原生喬木林和次生林土壤無機(jī)氮含量隨培養(yǎng)時(shí)間延長存在明顯的變化,NH_4~+-N含量呈先增加后減少再增加趨勢,NO-3-N含量表現(xiàn)為總體增加趨勢。NH_4~+-N是土壤有效氮的主要存在形式,其含量占土壤無機(jī)氮的84.57%~94.31%。(2)兩演替群落土壤氮礦化速率呈"V"形變化,范圍分別為-0.43~0.97 mg/(kg·d)和-0.91~1.43 mg/(kg·d);硝化速率呈波動上升趨勢,范圍分別為0.21~0.49 mg/(kg·d)和0.03~0.31 mg/(kg·d)。(3)原生喬木林土壤無機(jī)氮含量、礦化速率、氨化速率和硝化速率均高于次生林。(4)原生喬木林土壤氮全年凈礦化總量170.82 kg/(hm~2·a),是次生林的2.48倍,兩種林分土壤凈硝化氮分別占凈礦化氮的95%和100%。【結(jié)論】喀斯特森林土壤供氮能力較強(qiáng),但土壤氮礦化過程中氮硝化占主導(dǎo),表明土壤中植物可利用的氮素易于淋溶或揮發(fā)損失。
[Abstract]:[objective] to study the characteristics of nitrogen mineralization and nitrogen supply ability of karst forest soil. [methods] the primary tree forest and secondary forest of Guizhou karst forest were studied, and the resin core method was used. The dynamic characteristics of soil nitrogen mineralization / nitrification were determined by in situ continuous culture. [results] [results] the contents of inorganic nitrogen in the soil of primary tree forest and secondary forest of karst forest changed obviously with the increase of culture time. NH4 ~ -N content increased first and then decreased and then increased. The general increasing trend of NO-3-N content was that NH4- N was the main form of soil available nitrogen. The soil nitrogen mineralization rate of the succession community showed a "V" shape, ranging from -0.43 to 0.97 mg/(kg / d and -0.911 / 1.43 mg/(kg / dN, respectively, and the nitrification rate showed a fluctuating upward trend, ranging from 0.21 to 0.49 mg/(kg / d and 0.030.31 mg/(kg / d ~ (3), respectively, from 84.57 to 94.31 mg/(kg / d ~ (2)) of soil inorganic nitrogen in two succession communities, respectively, and the contents of inorganic nitrogen in the soil of Arbor forest were in the range of -0.43 ~ (0.97 mg/(kg / d) and -0.911 ~ (1.43) mg/(kg / d ~ (3), respectively. The mineralization rate, ammoniation rate and nitrification rate were higher than that in the secondary forest. The total net mineralization amount of soil nitrogen in the native Arbor forest was 170.82 kg/(hm~2 / a per year, which was 2.48 times of that in the secondary forest. [conclusion] the nitrogen supply ability of karst forest soil is stronger, but nitrogen nitrification dominates in the process of soil nitrogen mineralization, which indicates that the available nitrogen in soil is easy to be leached or volatilized.
【作者單位】： 貴州省林業(yè)科學(xué)研究院;
【基金】：貴州省林業(yè)廳青年人才基金項(xiàng)目(黔林科合J字[2014]09號,黔林科合J字[2015]14號) 貴州省重大基礎(chǔ)研究項(xiàng)目(黔科合JZ字[2014]200212) 貴州森林生態(tài)效益監(jiān)測與評價(jià)科技創(chuàng)新人才團(tuán)隊(duì)項(xiàng)目(黔科合人才團(tuán)隊(duì)[2014]4004號) 貴州省林業(yè)科學(xué)研究院院士工作站項(xiàng)目(黔科合院士站[2014]4006)
【分類號】：S714.2

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