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氮、磷添加对半干旱沙质草地植被养分动态的影响 预览 被引量:15

Effects of N and P fertilization on nutrient dynamics of semi-arid sandy grassland vegetation
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摘要 通过对科尔沁半干旱沙质草地进行田间施肥试验,测定植被组成中黄蒿和白草在生长季内(7~10月)的养分动态变化,并结合N∶P化学计量学的原理和方法,研究了半干旱沙质草地的养分限制状况。结果表明,N、P添加下黄蒿和白草地上部分N、P养分浓度都具有明显的季节动态变化。其中,黄蒿和白草地上部分N浓度随时间呈递减的趋势,且它们随时间的递减规律分别可用线性函数Y=a+bX以及幂函数Y=aXb模拟表示,函数中系数b的绝对值可以反映不同养分状况下植株的生长速率;对P浓度来说,黄蒿和白草地上部分P浓度与时间的关系可以用二次函数Y=aX2+bX+c模拟。比较试验条件下植株体内N、P浓度的变化可知,在科尔沁半干旱沙质草地,N素是黄蒿和白草生长的主要养分限制因子,N肥添加下黄蒿和白草地上部分N浓度以及N∶P都显著的增加;P肥添加促进了白草对N素和P素的吸收,使地上部分N、P浓度增加,而对黄蒿没有显著的影响。 In many terrestrial ecosystems,nitrogen(N) and phosphorus(P) are the most limiting nutrients.In order to determine the nutrient status in semi-arid sandy grassland in Keerqin,this paper examined the nutrient dynamics of Artemisia scoparia and Pennisetum flaccidum in their growth period under different fertilizer additions,and based on the principles and methods of N∶P stoichiometry method,investigated the nutrient limit in the grassland.The results showed that the N and P concentrations of A. scoparia and P...
作者 刘大勇 陈平 范志平 于占源 LIU Dayong~(1; 2); CHEN Ping~3; FAN Zhiping~1; YU Zhanyuan~(1; 2) (()~1Daqinggou Ecological Station; Institute of Applied(Ecology; ) Chinese Academy of Sciences; Shenyang 110016; China; ()~2Graduate University of Chinese Academy of Sciences; Beijing 100039; ()~3First Station of Dongling District Greening and Management; Shenyang 110015; China);
出处 《生态学杂志》 CAS CSCD 北大核心 2006年第6期,共5页 Chinese Journal of Ecology
基金 国家“十一·五”科技攻关(BA517A02-1) 中国科学院知识创新工程重要方向资助项目(KZCX3-SW-418)。
关键词 黄蒿 白草 N浓度 P浓度 N:P Artemisia scoparia Pennisetum flaccidum N concentration P concentration N:P ratios.
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