N添加对白羊草生长及种群特征的影响

李文达; 王国梁; 刘国彬; 由政; 邱甜甜; 吕凤莲; 李盼盼

doi:10.13961/j.cnki.stbctb.2016.01.030

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N添加对白羊草生长及种群特征的影响

试验研究

- N添加对白羊草生长及种群特征的影响
- Effects of Nitrogen Additions on Growth and Propagation of Bothriochloa Ischaemum Population
- 水土保持通报 2016年36卷第1期页码：174-178
- 作者机构：
  
  1. 西北农林科技大学林学院, 陕西杨凌,712100
  2. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目"土壤有效N升高对白羊草群落特征及土壤侵蚀过程的影响机制"(D011004);国家"十二五"科技支撑课题(2015BAC01B03)
- DOI：10.13961/j.cnki.stbctb.2016.01.030
  中图分类号：
- 纸质出版：2016
- 稿件说明：
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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.

LI Wenda, WANG Guoliang, LIU Guobin, et al. Effects of Nitrogen Additions on Growth and Propagation of Bothriochloa Ischaemum Population[J]. Bulletin of Soiland Water Conservation, 2016, 36(1): 174-178.
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. DOI： 10.13961/j.cnki.stbctb.2016.01.030.

LI Wenda, WANG Guoliang, LIU Guobin, et al. Effects of Nitrogen Additions on Growth and Propagation of Bothriochloa Ischaemum Population[J]. Bulletin of Soiland Water Conservation, 2016, 36(1): 174-178. DOI： 10.13961/j.cnki.stbctb.2016.01.030.

摘要

[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(0 g/(m

·a))

低氮(2.5 g/(m

·a))

中氮(5.0 g/(m

·a))和高氮(10.0 g/(m

·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(

5 g/(m

·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.

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(0 g/(m2·a))

low nitrogen (2.5 g/(m2·a))

middle nitrogen (5.0 g/(m2·a)) and high nitrogen (10.0 g/(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 (<5 g/(m2·a)) can promote the growth and development of B. ischaemum population

and improve its ecological function in soil and water conservation.

关键词

Keywords

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