本文選題：杉木人工林 + 土壤養(yǎng)分��； 參考：《中國林業(yè)科學(xué)研究院》2017年碩士論文

【摘要】：本文以四川納溪30年生杉木(Cunninghamia lanceolata)密度試驗林為研究對象,通過對不同密度(5種密度分別為2m×3m(A)、2m×1.5m(B)、2m×1m(C)、1m×1.5m(D)和1m×1m(E)(即A為1667株/公頃;B為3333株/公頃;C為5000株/公頃;D為6667株/公頃;E為10000株/公頃)和不同土層(5個土層:0-20cm、20-40cm、40-60cm、60-80cm、80-100cm)杉木人工林土壤各養(yǎng)分元素特征規(guī)律及其化學(xué)計量學(xué)特征,并探討土壤養(yǎng)分元素含量對林地立地指數(shù)的指示性,得到如下4點主要結(jié)論:(1)初植密度對杉木人工成熟林土壤養(yǎng)分具有明顯影響,其中,有機質(zhì)與有機碳在表土層0-20cm、水解氮、全鈣含量隨密度增大總體上呈先上升后下降變化趨勢,在B密度(2m×1.5m,3333株·hm-2)時含量最大;全磷、全鉀、速效鉀含量隨密度增大則呈先下降后上升趨勢,在B密度含量最低,且全磷、全鉀含量在E密度最高;全鎂含量、pH總體隨密度的升高而上升;有機質(zhì)與有機碳在20cm以下土層以及全氮含量受密度影響不明顯;表明B密度有利于表層土壤有機質(zhì)及有機碳累積,有利于土壤不同層面水解氮與全鈣的累積,而高密度E密度有利于全磷、全鉀、全鎂的累積及pH值的上升。養(yǎng)分元素含量的密度效應(yīng)總體上隨土層的增加而減弱。(2)全氮、水解氮、全磷、有機質(zhì)、有機碳含量總體上隨土層的加深呈極顯著下降趨勢;全鉀、速效鉀、全鈣、全鐵、全鎂含量受土層變化的影響不明顯;土壤pH值隨土層的加深呈明顯上升趨勢;土層深度對養(yǎng)分元素含量及PH值的作用效果在土壤深度達(dá)60cm以后明顯減弱。(3)5種密度杉木人工林土壤C:N平均值為19.44,高于我國平均值11.9;N:P和C:P平均值為2.89和43.07,低于我國平均值5.2和61;C:N:P為43:3:1,低于我國平均值60:5:1;初植密度對土壤C:N、N:P、C:P比值,尤其是在表層土壤,均具明顯影響,且隨密度的增大各比值呈先上升后下降的規(guī)律,均在B密度最高;N:P和C:P隨土壤深度的增加呈近乎直線下降趨勢,而隨土層加深C:N呈先下降后上升的變化趨勢。(4)有效磷、全鎂含量對杉木林地生產(chǎn)力具有良好的指示性,表現(xiàn)為土壤有效磷含量越高、全鎂含量越低,林地立地質(zhì)量越高;0-100cm土層的土壤有效磷含量或0-20cm土層的土壤全鎂含量可作為試驗區(qū)杉木人工林立地質(zhì)量評價指示性指標(biāo)。
[Abstract]:The density of Cunninghamia lanceolata (Cunninghamia lanceolata), a 30-year-old Chinese fir forest in Naxi, Sichuan Province, was studied in this paper. In this paper, 5 different densities of 2 m 脳 3 m ~ 2 脳 1. 5 m ~ (m) B ~ (2 m) and 1 m 脳 1. 5 m ~ (-1) C ~ (2 m) and 1 脳 1 路1 m ~ (-1) C (A = 1667 plants / hm ~ (2) C = 3333 plants / hm ~ (2) C = 5000 plants / hm ~ (2) C = 6667 plants / hm ~ (2) and different soil layers (0 ~ 20 cm ~ 20 cm ~ 40 cm ~ (40) ~ 60 cm ~ (-1) ~ (60) cm ~ (80) cm ~ (-1) were studied in different soil layers of Cunninghamia lanceolata plantations under different densities (0 ~ 20 cm ~ (-1) ~ 20 cm ~ (-1). The characteristics of nutrient elements in soil and its chemometrics, The indicator of soil nutrient element content on site index of forest land was discussed. The main conclusions were as follows: (1) the initial planting density had obvious influence on soil nutrient of Chinese fir artificial mature forest, in which organic matter and organic carbon were 0-20 cm in topsoil layer and hydrolyzed nitrogen. The total calcium content increased first and then decreased with the density increasing, and the content of total phosphorus, total potassium and available potassium decreased first and then increased with the increase of density, and the content of total phosphorus, total potassium and available potassium was the lowest in B density, and the total phosphorus content was the lowest in B density, and the content of available potassium in B density was the lowest, and the content of available potassium in B density was the lowest. Total potassium content was the highest in E density, total magnesium content and pH value increased with density, organic matter and organic carbon content in soil layer below 20cm and total nitrogen content were not significantly affected by density. The results showed that B density was beneficial to the accumulation of organic matter and organic carbon in surface soil, to the accumulation of hydrolyzed nitrogen and total calcium in different layers of soil, and to the accumulation of total phosphorus, total potassium, total magnesium and the increase of pH value in high density E density. The density effect of nutrient element content decreased with the increase of soil layer. (2) Total nitrogen, hydrolyzed nitrogen, total phosphorus, organic matter, organic carbon content showed an extremely significant downward trend with the deepening of soil layer, total potassium, available potassium, total calcium, total iron, total potassium, total available potassium, total calcium, total iron, The content of total magnesium is not affected by the change of soil layer, and the pH value of soil increases obviously with the deepening of soil layer. The effect of soil depth on nutrient content and PH value was obviously weakened when the soil depth reached 60cm. The average value of C: n in Chinese fir plantation with five densities was 19.44, which was higher than the average value of 11.9% P and 43.07 in China, which was lower than that in China. The average value of 5.2 and 61% N: P is 43: 3: 1, which is lower than the average of 60: 5: 1 in our country. Especially in the surface soil, the ratio increased firstly and then decreased with the increase of density, and the ratio of N: P and C: P decreased almost linearly with the increase of soil depth at the highest density of B, and the ratio of N: P and C: P increased with the increase of soil depth. With the deepening of soil layer, the content of total magnesium had a good indicative effect on the productivity of Chinese fir woodland. The higher the content of available phosphorus, the lower the content of total magnesium. The higher the site quality is, the higher the soil available phosphorus content in 0-100 cm soil layer or the total magnesium content in 0-20cm soil layer can be used as an indicator for site quality evaluation of Chinese fir plantation in the experimental area.
【學(xué)位授予單位】：中國林業(yè)科學(xué)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：S714

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