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N添加对白羊草生长及种群特征的影响
李文达1; 王国梁1,2; 刘国彬1,2; 由政1; 邱甜甜1
2016
Source Publication水土保持通报
Volume36Issue:1Pages:174-178
Abstract

[目的]分析N添加对白羊草(Bothriochloa ischaemum)种群特征及繁殖策略的影响,为评估氮沉降
的生态影响提供科学依据。[方法]以黄土高原地带性优势种群白羊草为对象,设置对照CK〔0g/(m2·a)〕,
低氮〔2.5g/(m2·a)〕,中氮〔5.0g/(m2·a)〕和高氮〔10.0g/(m2·a)〕4个N添加水平,研究了为期两年
的N添加对白羊草种群特征及繁殖策略的影响。[结果](1)N添加显著增加了白羊草种群的密度、株高
和生物量,其中中氮处理下种群生物量达到最大;(2)N添加改变了白羊草生物量的分配策略,根冠比随
N添加量增大而减小,支持功能平衡假说;(3)N添加促进了白羊草种群的营养繁殖和有性繁殖,提高了
其繁殖竞争能力。[结论]适度N沉降或N添加〔<5g/(m2·a)〕促进了白羊草种群的生长和发育,有利
于白羊草种群水土保持等生态功能的发挥。

Other Abstract

[Objective]The objective of this study is to analyze the influences of N addition on population
characteristics and reproduction strategies of Bothriochloa ischaemum population in order to assess the impact
of N deposition on the ecological environment.[Methods]This study was conducted to investigate the responses
of population characteristics and reproduction strategies of B.ischaemum population to N addition
based on four N addition treatments,including control CK〔0g/(m2·a)〕,low nitrogen〔2.5g/(m2·a)〕,middle
nitrogen〔5.0g/(m2·a)〕and high nitrogen〔10.0g/(m2·a)〕for two years.[Results](1)The N addition
significantly increased the height and biomass of B.ischaemum population,population biomass reached the
maximum with middle nitrogen treatment.(2)N addition had changed the nutrient allocation strategies of
B.ischaemum.Root-shoot ratio decreased with the increments of N addition.(3)N addition promoted sexual
reproduction and vegetative propagation of B.ischaemum population,enabled its high ability of breeding
and competition.[Conclusion]Moderate N sedimentation or N addition〔<5g/(m2·a)〕can promote the
growth and development of B.ischaemum population,and improve its ecological function in soil and water
conservation.

KeywordN添加 种群特征 生物量 分配策略 黄土高原
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/361005/8714
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学林学院
2.中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
李文达,王国梁,刘国彬,等. N添加对白羊草生长及种群特征的影响[J]. 水土保持通报,2016,36(1):174-178.
APA 李文达,王国梁,刘国彬,由政,&邱甜甜.(2016).N添加对白羊草生长及种群特征的影响.水土保持通报,36(1),174-178.
MLA 李文达,et al."N添加对白羊草生长及种群特征的影响".水土保持通报 36.1(2016):174-178.
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