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半干旱草地长期封育进程中针茅植物根系格局变化 特征
苏纪帅1; 赵洁1; 井光花2; 魏琳2; 刘建1
2017
Source Publication生态学报
Volume37Issue:19Pages:6571-6580
Abstract

以云雾山不同封育年限草地针茅植物根系和土壤为研究对象,对其根系特征、土壤特性及两者关系进行研究,以探讨分析
封育对针茅根系格局的影响。结果表明:(1)针茅植物根系生物量、根长密度、根表面积和根体积在封育初期轻微下降,之后缓
慢上升,并在封育30 a 草地得到显著增加。(2)随封育年限增加,各根系指标在3 种针茅物种间的组成格局具有类似变化规
律,具体表现为:长芒草在放牧草地所占比例最高,之后逐渐降低,并在封育30 a 草地消失;大针茅所占比例呈先升后降变化规
律,并在封育22 a 草地达到最大值;甘青针茅仅出现于封育30 a 草地,且占据优势地位。(3)大针茅和甘青针茅0—0.6 mm 径
级根系比例高于大针茅,使其根系直径显著低于大针茅,比根长和比根面积显著高于大针茅;此外,长芒草根组织密度显著高于
长芒草和甘青针茅。(4)长期封育在显著提高土壤水分、养分含量和土壤氮磷比的同时显著降低土壤碳氮比,但对微生物生物
量碳、氮无明显影响。(5)针茅根系特征与土壤指标的关联性分析显示针茅根系受土壤氮资源的显著影响。

Other Abstract

We selected five grassland sites with different grazing exclusion times (0,5,9,22,and 30 years) on Yunwu
Mountain as the study sites,where the roots of Stipa plants in the 0—30 cm soil layer and soil of the 0—20 cm soil layer
were collected. Roots were washed and identified to the species level based on attached aboveground parts and root color,
texture,and branching. Root samples of the same species were scanned using an Epson Scanner to obtain images for analysis
of root morphological traits using WinRhizoPro software. Root length,surface area,and volume were analyzed at 0.1 mm
intervals in root diameter,the measurements of which could be used for calculations of specific root length (SRL),specific
root surface area (SRS),and root tissue density (RTD). Soil samples were analyzed to determine soil moisture,soil bulkdensity,soil pH,soil organic carbon,total soil nitrogen,total soil phosphorous,available soil nitrogen,available soil
phosphorus,microbial biomass carbon,and microbial biomass nitrogen. One-way analysis of variance was conducted to
determine the effect of grazing exclusion time on Stipa root traits,and to determine differences in the roots of different Stipa
species. Redundancy analysis was conducted to determine soil variables that best explain the variations in Stipa root traits.
The main results were as follows. (1) The root biomass,root length density,root surface area,and root volume of Stipa
plants showed a slight decrease at the beginning of grazing exclusion,but thereafter gradually increased and showed
significant increases in grassland with grazing exclusion for 30 years. (2) All of the root trait indexes showed similar species
compositional changes with grazing exclusion time. Specifically,the proportion of Stipa bungeana was the highest in grazed
grassland,then gradually declined with grazing exclusion time,and disappeared after 30 years' grazing exclusion; the
proportion of Stipa grandis initially increased,peaked in grasslands after 20 years' grazing exclusion,and then sharply
decreased to the initial status; and Stipa przewalskyi appeared only in grassland with 30 years' grazing exclusion and became
the dominant Stipa species. (3) Compared with the roots of S. grandis,the roots of S. bungeana and S. przewalskyi were
thinner and had higher SRL and SRS,mainly resulting from a larger proportion of root traits in the 0—0.6 mm root diameter
class. Besides,root tissue density of S. bungeana was higher than that of S. grandis and S. przewalskyi. ( 4) Long-term
grazing exclusion significantly increased soil water content,total soil nitrogen,total soil phosphorus,soil nitrate nitrogen,
and available soil phosphorus,and showed limited impacts on soil bulk density,soil pH,soil ammonium nitrogen,soil
microbial biomass carbon,and soil microbial biomass nitrogen. With significantly increased total soil nitrogen,long-term
grazing exclusion significantly decreased the ratio of soil carbon to nitrogen and significantly increased the ratio of soil
nitrogen to phosphorus. (5) Redundancy analysis showed positive correlations among root biomass,root length density,root
surface area,and root volume,and total soil nitrogen and ammonium nitrogen were significant factors explaining variations
in the root traits of Stipa plants after grazing exclusion. Furthermore,root traits were positively affected by soil water content
and available soil phosphorus,and were negatively affected by soil pH. In conclusion,inherent differences in the root traits
of three Stipa species and changes in soil properties collectively drove the root trait patterns of Stipa plants in semiarid
grassland after long-term grazing exclusion in this area.

Keyword封育 针茅 根系形态特征 物种组成格局
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8493
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学动物科技学院
2.中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
苏纪帅,赵洁,井光花,等. 半干旱草地长期封育进程中针茅植物根系格局变化 特征[J]. 生态学报,2017,37(19):6571-6580.
APA 苏纪帅,赵洁,井光花,魏琳,&刘建.(2017).半干旱草地长期封育进程中针茅植物根系格局变化 特征.生态学报,37(19),6571-6580.
MLA 苏纪帅,et al."半干旱草地长期封育进程中针茅植物根系格局变化 特征".生态学报 37.19(2017):6571-6580.
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