桉树人工林土壤腐殖质及其与土壤主要养分的关系

发布时间：2018-02-15 02:37

  本文关键词： 连栽 桉树人工林 土壤腐殖质 胡敏酸 富里酸 结合形态　出处：《广西大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以广西国有东门林场不同栽植代数桉树人工林(第1代林、第2代林和第3代林)为研究对象,以灌草坡为参照,采用定位监测和时空互换相结合方法,研究了不同栽植代数桉树人工林土壤腐殖质组成、特性和结合形态及其季节动态变化规律,探索了土壤腐殖质组成、结合形态与土壤主要肥力因子的关系,以期为桉树人工林的可持续经营提供科学依据和基础材料。主要研究结果如下：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数桉树人工林,且差异均极显著(P0.01),胡敏酸碳含量和富里酸碳含量均表现为随着连栽代数的增加而下降。灌草坡和不同栽植代数桉树人工林胡敏酸和富里酸之比(HA/FA)趋于一致；E4值表现为灌草坡第2代林第3代林第1代林；E4/E6表现为第1代林第3代林第2代林灌草坡；腐殖化度表现为灌草坡第1代林第2代林第3代林。不同代数桉树人工林土壤胡敏酸碳含量、富里酸碳含量均随着土壤深度增大而下降,且差异极显著(P0.01)。不同栽植代数桉树人工林和灌草坡土壤胡敏酸碳含量季节变化均表现为夏季最高,春季、秋季、冬季均有最小值出现；第1代林和第2代林土壤富里酸碳含量季节变化差异均不显著(P0.05),第3代林和灌草坡则是春季、秋季显著高于冬季,其他季节之间差异不显著(P0.05)。2、不同栽植代数桉树人工林土壤腐殖质松结合态、稳结合态、松结合态与紧结合态之比值(Ⅰ/Ⅲ)均表现为随着栽植代数的增加而下降,灌草坡土壤腐殖质松结合态含量显著(P0.05)高于其他三种桉树人工林,不同桉树林间差异不显著(P0.05)；不同桉树林分和灌草坡紧结合态腐殖质含量无显著差异(P0.05)；不同林分类型土壤腐殖质的活性高低表现为灌草坡第1代林第2代林第3代林。土壤腐殖质松结合形态、稳结合态、Ⅰ/Ⅲ值均与土壤深度呈现负相关,而且差异均极显著(O0.01)；土壤腐殖质紧结合态与土壤深度也呈现负相关,但只有第1代林差异达到极显著(P0.01)。3、不同栽植代数桉树人工林和灌草坡土壤全氮、速效钾含量变化规律为：灌草坡第1代林第3代林第2代林；全磷含量表现为：灌草坡第3代林第2代林第1代林；土壤pH值、水解氮含量表现为灌草坡最高,其他三种桉树人工林随着栽植代数的增加而下降；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。桉树人工林土壤全氮、水解氮、速效磷含量均表现为夏季含量最高,秋季或者冬季含量最低；速效钾含量最高为夏季或秋季,最低为秋季或冬季；碳氮比C/N最小值出现在春季或夏季,最大值出现在冬季。4、土壤全氮与腐殖酸碳含量、胡敏酸碳含量、富里酸碳含量表现为正相关关系,相关关系均达极显著水平(P0.01)；与E4/E6比表现为负相关关系,达显著水平(P0.05)。土壤腐殖酸碳含量、胡敏酸碳含量、富里酸碳含量、E4与土壤速效钾含量均为正相关关系,差异达到显著(P0.05)或者极显著水平(P0.01)；E4/E6比与土壤速效钾含量表现为负相关,达到显著相关水平(P0.05)。土壤水解氮含量与腐殖酸碳含量、胡敏酸碳含量、富里酸碳含量均表现为正相关关系,差异均达到极显著(P0.01),与E4/E6表现为负相关关系,达显著水平(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 缁撳悎鎬，

本文编号：1512224