本文關(guān)鍵詞： 連栽 桉樹人工林 土壤腐殖質(zhì) 胡敏酸 富里酸 結(jié)合形態(tài)　出處：《廣西大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以廣西國有東門林場不同栽植代數(shù)桉樹人工林(第1代林、第2代林和第3代林)為研究對象,以灌草坡為參照,采用定位監(jiān)測和時空互換相結(jié)合方法,研究了不同栽植代數(shù)桉樹人工林土壤腐殖質(zhì)組成、特性和結(jié)合形態(tài)及其季節(jié)動態(tài)變化規(guī)律,探索了土壤腐殖質(zhì)組成、結(jié)合形態(tài)與土壤主要肥力因子的關(guān)系,以期為桉樹人工林的可持續(xù)經(jīng)營提供科學(xué)依據(jù)和基礎(chǔ)材料。主要研究結(jié)果如下：1、灌草坡的土壤胡敏酸碳含量、富里酸碳含量均高于不同栽植代數(shù)桉樹人工林,且差異均極顯著(P0.01),胡敏酸碳含量和富里酸碳含量均表現(xiàn)為隨著連栽代數(shù)的增加而下降。灌草坡和不同栽植代數(shù)桉樹人工林胡敏酸和富里酸之比(HA/FA)趨于一致；E4值表現(xiàn)為灌草坡第2代林第3代林第1代林；E4/E6表現(xiàn)為第1代林第3代林第2代林灌草坡；腐殖化度表現(xiàn)為灌草坡第1代林第2代林第3代林。不同代數(shù)桉樹人工林土壤胡敏酸碳含量、富里酸碳含量均隨著土壤深度增大而下降,且差異極顯著(P0.01)。不同栽植代數(shù)桉樹人工林和灌草坡土壤胡敏酸碳含量季節(jié)變化均表現(xiàn)為夏季最高,春季、秋季、冬季均有最小值出現(xiàn)；第1代林和第2代林土壤富里酸碳含量季節(jié)變化差異均不顯著(P0.05),第3代林和灌草坡則是春季、秋季顯著高于冬季,其他季節(jié)之間差異不顯著(P0.05)。2、不同栽植代數(shù)桉樹人工林土壤腐殖質(zhì)松結(jié)合態(tài)、穩(wěn)結(jié)合態(tài)、松結(jié)合態(tài)與緊結(jié)合態(tài)之比值(Ⅰ/Ⅲ)均表現(xiàn)為隨著栽植代數(shù)的增加而下降,灌草坡土壤腐殖質(zhì)松結(jié)合態(tài)含量顯著(P0.05)高于其他三種桉樹人工林,不同桉樹林間差異不顯著(P0.05)；不同桉樹林分和灌草坡緊結(jié)合態(tài)腐殖質(zhì)含量無顯著差異(P0.05)；不同林分類型土壤腐殖質(zhì)的活性高低表現(xiàn)為灌草坡第1代林第2代林第3代林。土壤腐殖質(zhì)松結(jié)合形態(tài)、穩(wěn)結(jié)合態(tài)、Ⅰ/Ⅲ值均與土壤深度呈現(xiàn)負(fù)相關(guān),而且差異均極顯著(O0.01)；土壤腐殖質(zhì)緊結(jié)合態(tài)與土壤深度也呈現(xiàn)負(fù)相關(guān),但只有第1代林差異達(dá)到極顯著(P0.01)。3、不同栽植代數(shù)桉樹人工林和灌草坡土壤全氮、速效鉀含量變化規(guī)律為：灌草坡第1代林第3代林第2代林；全磷含量表現(xiàn)為：灌草坡第3代林第2代林第1代林；土壤pH值、水解氮含量表現(xiàn)為灌草坡最高,其他三種桉樹人工林隨著栽植代數(shù)的增加而下降；速效磷含量以灌草坡最高,第2代林最低；自然含水量以第1代林最高,灌草坡次之,往后依次是第2代林、第3代林。桉樹人工林土壤全氮、水解氮、速效磷含量均表現(xiàn)為夏季含量最高,秋季或者冬季含量最低；速效鉀含量最高為夏季或秋季,最低為秋季或冬季；碳氮比C/N最小值出現(xiàn)在春季或夏季,最大值出現(xiàn)在冬季。4、土壤全氮與腐殖酸碳含量、胡敏酸碳含量、富里酸碳含量表現(xiàn)為正相關(guān)關(guān)系,相關(guān)關(guān)系均達(dá)極顯著水平(P0.01)；與E4/E6比表現(xiàn)為負(fù)相關(guān)關(guān)系,達(dá)顯著水平(P0.05)。土壤腐殖酸碳含量、胡敏酸碳含量、富里酸碳含量、E4與土壤速效鉀含量均為正相關(guān)關(guān)系,差異達(dá)到顯著(P0.05)或者極顯著水平(P0.01)；E4/E6比與土壤速效鉀含量表現(xiàn)為負(fù)相關(guān),達(dá)到顯著相關(guān)水平(P0.05)。土壤水解氮含量與腐殖酸碳含量、胡敏酸碳含量、富里酸碳含量均表現(xiàn)為正相關(guān)關(guān)系,差異均達(dá)到極顯著(P0.01),與E4/E6表現(xiàn)為負(fù)相關(guān)關(guān)系,達(dá)顯著水平(P0.05)。
[Abstract]:This paper takes Guangxi Dongmen different planting generations of Eucalyptus Plantation (first generation, second generation and third generation) as the research object, on the grass slope as the reference, using the method of combining location monitoring and space-time exchange, different planting generations of Eucalyptus plantation soil humus composition was studied, and combined with the characteristics of morphology and seasonal change the law, explore the composition of soil humus, combined with the relationship between the main forms and soil fertility factors, in order to sustainable management of Eucalyptus Plantation and provide scientific basis and basic materials. The main results are as follows: 1. The soil carbon content of shrub grass Hu Min acid, fulvic acid carbon content were higher than those of different planting generations of Eucalyptus plantation, and the differences were significant (P0.01), Hu Min acid fulvic acid carbon content and carbon content were decreased with the increase of continuous cropping algebra. Shrub grass and different planting generation number of Eucalyptus Plantation Lin Hu Min acid and fulvic acid ratio (HA/FA) tends to be consistent; the E4 value shows forest shrub grass second generation third generation first generation E4/E6 forest; for the first generation third generation second generation forest forest shrub grass; humification for shrub grass first generation second generation third generation forest forest. Different algebra eucalyptus plantation soil carbon content of Hu Min acid, fulvic acid carbon content increased with the increasing of the soil depth decreased, and the difference was very significant (P0.01). Different planting Eucalyptus Plantation and shrub grass seasonal changes in carbon content of acid soil in Hu Min were the highest in summer, spring, autumn and winter are minimum; first first and second generation of soil fulvic acid seasonal changes in carbon content had no significant difference (P0.05), third forest and shrub grass slope is the spring and autumn was significantly higher than in winter, there was no significant difference between other seasons (P0.05).2, different planting Eucalyptus Plantation Soil Humus loose 緇撳悎鎬，

本文編號：1512224