不同森林经营模式对深层土壤碳素的影响毕业论文_林学毕业论文

不同森林经营模式对深层土壤碳素的影响毕业论文

2021-04-20更新

摘 要

为了明确森林经营模式对深层土壤有机碳的影响,本文以杨树女贞混交林和杨树石楠混交林两种混交模式为对象,研究了不同经营模式对60~80cm的深层土壤有机碳各组分的影响,并与杨树纯林进行对比。结果表明:(1)对于土壤有机碳(SOC),杨树石楠混交SOC显著高于其他两种经营模式,杨树石楠混交SOC含量为7.73 g/kg;杨树纯林的SOC最低,为3.70 g/kg;杨树女贞混交林介于二者之间,为4.17 g/kg。(2)对于SOC中所包含的微生物有机碳(MBC)平均值表现为:杨树石楠混交最高,为806.30mg/kg;杨树纯林最低,为617.78mg/kg;杨树女贞混交介于二者之间,为669.02mg/kg。(3)可溶性有机碳(DOC)平均值表现为:杨树女贞最高,为77.36 mg/kg;杨树石楠混交最低,为44.02 mg/kg;杨树纯林介于二者之间,为57.76 mg/kg。杨树女贞混交显著高于杨树石楠混交, 杨树女贞混交高于杨树纯林但不显著。(4)土壤易氧化有机碳(EOC)表现为:杨树石楠混交含量最高,为2.42 g/kg;杨树纯林的最低,为1.28g/kg;杨树女贞混交林介于二者之间,为1.29 g/kg。杨树石楠混交显著高于其他两种经营模式。以上结果表明,不同经营模式改变了深层土壤有机碳的含量与组成比例。

关键词:森林经营模式,SOC,MBC,DOC,EOC

The Effect of Different Forest Management Modes on Organic Carbon in Deep Soil

ABSTRACT

In order to clarify the effects of forest management modes on deep soil organic carbon, in this paper we studied the effects of different management modes on the components of deep soil organic carbon from 60 cm to 80 cm, and compared them with pure poplar forest. The results showed that: (1)For soil organic carbon (SOC), the deep soil organic carbon in the forest which poplar mixed with Photinia was significantly higher than the other two management modes, the highest content of SOC was 7.73 g/kg in the forest which poplar was mixed with Photinia, the lowest SOC was 3.70 g/kg in the pure poplar forest, and 4.17 g/kg in the forest which poplar was mixed with Ligustrum lucidum. (2)For the average of microbial organic carbon (MBC) contained in SOC, the highest content of them was the forest which Photinia was mixed with poplar (806.30 mg/kg), the lowest was the pure poplar (617.78 mg /kg), and the Poplar mixed with Ligustrum lucidum forest(669.02 mg/kg) was in the middle. There was no significant difference in microbial organic carbon content among the three management modes. (3)The average content of soluble organic carbon (DOC) was as follows: Forest which poplar was mixed with Ligustrum lucidum was the highest, the highest content was 77.36 mg/kg; Poplar mixed with Photinia was the lowest, the lowest content was 44.02 mg/kg; the content of Poplar pure forest was in the middle, which was 57.76 mg/kg. Poplar mixed with Ligustrum lucidum was significantly higher than Poplar mixed with Photinia, and the Poplar mixed with Ligustrum was higher than Poplar pure forest, but not significant. (4)The soil readily oxidizable organic carbon (EOC) showed that the mixed poplar with Photinia had the highest content (2.42 g/kg), the pure poplar forest had the lowest content (1.28 g/kg), and the poplar mixed with Ligustrum lucidum forest had the middle content (1.29 g/kg). The mixed poplar and Photinia were significantly higher than the other two management modes, while that of the mixed poplar with Ligustrum lucidum was higher than the pure poplar forest, but was not significant. The results showed that different management modes changed the content and proportion of organic carbon in deep soil.

Key words:forest management mode, SOC,MBC,DOC,EOC

目 录

1 前言………………………………………………………………………………………………1

1.1 研究背景………………………………………….…………………………………………………..1

1.2 研究目的………………………………………….…………………………………………………..1

1.3 研究意义………………………………………….…………………………………………………..1

2 文献综述…………………………………………………………………………………………2

2.1 土壤中有机碳各组分介绍………………………………………….………………………….2

2.1.1 微生物生物量碳……………………………………………………………………..2

2.1.2 易氧化有机碳………………………………………………………………………………………………..2

2.1.3 可溶性有机碳………………………………………………………………………………………………..2

2.2 深层土壤有机碳的研究现状………………………………………………………………….3

2.3 深层土壤有机碳的研究展望………………………………………………………………….3

3 研究对象及研究方法……………………………………………………………………………5

3.1 研究方法………………………………………………………………………………………………5

3.1.1 研究地概况及样地设置……………………………………………………………………5

3.1.2 样品采集及处理………………………………………………………………………………5

3.1.3 试验指标测定………………………………………………………………………………….5

3.1.4 数据分析………………………………………………………………………………………6

4 结果与分析………………………………………………………………………………………7

4.1 多种经营模式对深层土壤有机碳的影响………………………………………………………7

4.2 多种经营模式对深层土壤微生物有机碳的影响……………………………………………7

4.3 多种经营模式对深层土壤可溶性有机碳的影响……………………………………………8

4.4 多种经营模式对深层土壤易氧化有机碳的影响……………………………………………9

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