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氮添加对白羊草种群及土壤特征的影响
李盼盼1; 李彬彬1; 刘国彬1,2
2017
Source Publication中 国 水 土 保 持 科 学
Volume15Issue:2Pages:35-42
Abstract

 为探究氮沉降对白羊草种群及土壤属性的影响,以黄土高原典型地带性植被白羊草种群为研究对象,通过人
工添加氮素,设置不同施氮处理(0、2. 5、5、10 g/(m 2 ·a)),系统研究土壤有效氮升高对白羊草种群特征及土壤养分
的影响。结果表明:1)氮添加量在一定范围内,可显著改善白羊草种群特征,超过该范围,则会影响白羊草种群正
常生长。在 2. 5 g/(m 2 ·a)施氮量下,白羊草花序数量和株高最大,当施氮量大于该值时,白羊草花序数量和株高呈
减小趋势,地上生物量随施氮量的增加显著增加(P <0. 05);在5 g/(m 2 ·a)施氮量下,白羊草根系生物量密度最大,
超过该值后根系生物量密度减小。2)随施氮量的增加,土壤中有机质和硝态氮质量分数增加,速效磷质量分数减
小,全氮和铵态氮无显著变化,表明土壤中有效氮质量分数增加,可影响自身及其他营养元素的吸收转化过程,从
而对白羊草种群的生长产生一定影响。研究结果可为黄土丘陵区草地植被建设与管理,提供基础数据和科学
依据。

Other Abstract

 Grassland ecosystem plays a great role in improving regional environment
condition and maintaining soil and water. With the nitrogen deposition increasing, vegetation
characteristics and soil properties of grassland ecosystem would be changed,which in turn influence their
effects on reducing soil erosion. Bothriochloa ischaemum community is considered as typical vegetation on
the Loess Plateau. Besides,the nitrogen content of soil in this region is relatively low. Hence,
researching nitrogen addition effect on the characteristics of B. ischaemum community has a great
significance in vegetation construction and soil and water conservation. [Methods]B. ischaemum was
seeded in the soil bin (2 m in length and 1m in width; soil bulk density was 1. 2 g/cm 3 ) with 20 cm row  spacing for each plant. Totally,50 plants of B. ischaemum were seeded for each soil bin. Watered
regularly during the first year and added nitrogen in the next year. Ammonium nitrate was used as
nitrogen source with four nitrogen levels (0,2. 5,5 and 10 g N/(m 2 ·a)),which was added to the soil
once every two weeks from June to August (six times in total). Moreover,the bare loess soil was selected
as control. For each treatment,there were three repetitions and 15 soil bins totally. Inflorescence number
and plant height of B. ischaemum were measured before each nitrogen addition,also the soil was sampled
(0 -5,5 -10,10 -20,and 20 -30 cm) at the same time to determine the soil organic matter,total
nitrogen and phosphorus,available nitrogen and phosphorus,pH and particle size distribution. At the
end of growth stage,vegetation coverage,biomass of aboveground and roots (65 ℃,48 h) were
measured. In addition to this,root characteristics such as total surface area were measured with
WinRHIZO software. The differences of vegetation characteristics and soil properties between all
treatments were analyzed by multiple comparison method. [Results]1) The height and inflorescence
number of B. ischaemum reached the maximum at the nitrogen addition level of 2. 5 g N/(m 2 ·a),then
decreased with the enhancement of nitrogen addition. 2) The aboveground biomass increased significantly
with the growing nitrogen addition level (P <0. 05) and the root biomass density of B. ischaemum got its
maximum at 5 g N/(m 2 ·a) nitrogen addition level. However,with nitrogen addition increased,root
biomass density showed a decreasing trend. 3) With the nitrogen addition up,the soil organic matter and
nitrate nitrogen content increased,while available phosphorus content decreased,whereas,there was no
significant relationship between nitrogen levels and total nitrogen or ammonium nitrogen.[Conclusions]
This study indicated that nitrogen deposition had a significant effect on grassland ecosystem. The B.
ischaemum grew well with the certain nitrogen addition level,while lower or higher nitrogen addition level
may limit its growth. This study may make a better understanding of potential impact of nitrogen
deposition on the characteristics of vegetation and soil properties,and would provide fundamental
scientific basis for regional vegetation construction under the background of global atmospheric nitrogen
deposition.

Keyword氮添加 白羊草 种群特征 土壤养分 黄土高原
Indexed By其他
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8374
Collection水保所知识产出(1956---)
Corresponding Author刘国彬
Affiliation1.西北农林科技大学林学院,712100,陕西杨凌
2.中国科学院水利部,水土保持研究所,黄土高原 土壤侵蚀与旱地农业国家重点实验室,712100,陕西杨凌
Recommended Citation
GB/T 7714
李盼盼,李彬彬,刘国彬. 氮添加对白羊草种群及土壤特征的影响[J]. 中 国 水 土 保 持 科 学,2017,15(2):35-42.
APA 李盼盼,李彬彬,&刘国彬.(2017).氮添加对白羊草种群及土壤特征的影响.中 国 水 土 保 持 科 学,15(2),35-42.
MLA 李盼盼,et al."氮添加对白羊草种群及土壤特征的影响".中 国 水 土 保 持 科 学 15.2(2017):35-42.
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