ISWC OpenIR  > 水保所知识产出(1956---)
人工柠条林密度变化对土壤水分及其生长的影响
张文文
Subtype硕士
Thesis Advisor郭忠升
2015-05
Degree Grantor中国科学院研究生院
Place of Conferral北京
Keyword植物密度 土壤水资源 植被生长 水资源利用限度
Abstract

黄土丘陵半干旱地区林地密度对土壤水分有较大的影响,进一步影响植物生
长,研究植被密度对土壤水分及生长的影响对森林植被恢复和生态建设具有重要
的意义。本研究以人工柠条林为对象,通过研究不同密度柠条林地土壤水分变化
及柠条生长状况,得出以下主要结论:
1)自播种后第三年开始,除最高初植密度柠条林(6700 株/100 m 2 小区)外,
柠条林地土壤水资源随初植密度的增加而增加,不同密度之间差异达显著水平;
除最低初植密度柠条林(2500 株/100 m 2 小区)外,10-12 年生不同密度柠条林地
土壤水资源差异不显著。
2)密度变化对柠条株高与基径影响与林龄有关:1-3 年生柠条初植密度越高
柠条株高生长越快;初植密度越大,1-5 年生柠条林基径生长越快。10-12 年生柠
条林密度过高过低都会抑制株高和基径生长。
3)不同初植密度柠条达到土壤水资源利用限度的时间不同,植物土壤水关系
调控起始期不同。高密度柠条林于播种后第 5 年达到土壤水资源利用限度,低密
度柠条林较晚达到(5-10 年)土壤水资源利用限度。
关键词:黄土丘陵半干旱地区林地密度对土壤水分有较大的影响,进一步影响植物生
长,研究植被密度对土壤水分及生长的影响对森林植被恢复和生态建设具有重要
的意义。本研究以人工柠条林为对象,通过研究不同密度柠条林地土壤水分变化
及柠条生长状况,得出以下主要结论:
1)自播种后第三年开始,除最高初植密度柠条林(6700 株/100 m 2 小区)外,
柠条林地土壤水资源随初植密度的增加而增加,不同密度之间差异达显著水平;
除最低初植密度柠条林(2500 株/100 m 2 小区)外,10-12 年生不同密度柠条林地
土壤水资源差异不显著。
2)密度变化对柠条株高与基径影响与林龄有关:1-3 年生柠条初植密度越高
柠条株高生长越快;初植密度越大,1-5 年生柠条林基径生长越快。10-12 年生柠
条林密度过高过低都会抑制株高和基径生长。
3)不同初植密度柠条达到土壤水资源利用限度的时间不同,植物土壤水关系
调控起始期不同。高密度柠条林于播种后第 5 年达到土壤水资源利用限度,低密
度柠条林较晚达到(5-10 年)土壤水资源利用限度。
关键词:植物密度;土壤水资源;植被生长;水资源利用限度

Other Abstract

Plant density is one of the most important factors affecting the soil water
resources on semi-arid loess hilly region. Furthermore, it also affects the plant growth.
Therefore, it is very necessary to explore the influence of plant density on soil moisture
and plant growth for vegetation restoration and ecological construction. This study
focused on Caragana korshinskii were investigated the variation of soil moisture and
its growth condition in test plots with different densities. Main conclusions draw from
this study are as follows:
1) Soil water content of Caragana korshinskii increased flowing the increase of
density and there were significant differences under the different densities of
treatments and the, except the highest original density of Caragana korshinskii (6700
plot/100 m 2 ), later 3years of plantation. Howeve, the differences of soil water contents
of 10-12years Caragana korshinskii under different densities were not significant,
except the lowest original density of Caragana korshinskii (2500plot/100 m 2 ).
2) The influences of density changes on height of Caragana korshinskii and its
basal diameter were connected with stand age. The plant height growth was positively
correlated to plant density for 1 to 3-year-old Caragana korshinskii. The basal diameter
increased flowing the increase of density in first 5 years. The plant height and basal
diameter growth were both restrained under the condition of excessive high or low
density of 10 to 12-years-old Caragana korshinskii.
3) The reaching times of the soil water resource use limit under different  Caragana korshinskii desnsities were different. The start and end times for influence of
vegetation on soil water systems were also different. The highest Caragana korshinskii
density reached the using limitation of soil water content in the fifth year. And the
lowest Caragana korshinskii density reached the using limitation of soil water content
after the fifth year.
Key Words: plant density; soil water resources; growth; the limit utilization of soil
water resource

Language中文
Document Type学位论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/9023
Collection水保所知识产出(1956---)
Recommended Citation
GB/T 7714
张文文. 人工柠条林密度变化对土壤水分及其生长的影响[D]. 北京. 中国科学院研究生院,2015.
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