摘要
选取内蒙古锡林郭勒典型草原区的轻度退化和重度退化草原群落,分别设置了一个氮素梯度添加试验和一个水分梯度控制试验,用SPAD-502叶绿素测定仪测定优势种羊草叶片叶绿素含量,从而研究不同退化程度的草原中羊草叶片叶绿素含量对水分和氮素添加的响应。结果表明:在重度退化草原羊草叶片叶绿素含量对氮素添加梯度的响应不明显,但与水分梯度显著相关;在轻度退化草原与氮素添加梯度显著相关,但对水分梯度响应不显著。由此推断,轻度退化草原,氮素是主要的影响因子;重度退化草原,水分是主要限制因子。
One lightly and one heavily degraded grassland community were selected in Xilinguole typical steppe region of Inner Mongolia. A nitrogen addition gradient experiment and a water gradient experiment were designed to research the response of leaf chlorophyll of Leymus chinensis population to water and nitrogen addition in different degraded degree grassland. The results showed that： the chlorophyll content in leaves of Leyrnus chinensis was not significantly correlated to nitrogen addition gradient, while significant correlated to water gradient in heavily degraded grassland; but chlorophyll content was correlated significantly to nitrogen gradient, while not correlated significantly to water gradient in lightly degraded grassland. Thereafter, the nitrogen was the main effect factor in lightly degraded grassland; and water was the main limit factor in heavily degraded grassland.
出处
《中国草地学报》
CSCD
北大核心
2012年第4期26-30,共5页
Chinese Journal of Grassland
基金
国家自然科学基金(30771528
30970494)
国家环保公益性行业科研专项(201109025-03B)
中央高校基本科研业务费专项资金(DC110105
DC120101142)资助
关键词
草原退化
羊草
SPAD值
氮素添加梯度
水分梯度
Grassland degradation
Leymus chinensis
Nitrogen addition gradient
SPAD value
Water gradient
