干旱区生态环境知识资源中心(Arid): 中国北部半干旱区乔木、灌木和草本3种不同生活型植物的氮素回收特征

Arid

	中国北部半干旱区乔木、灌木和草本3种不同生活型植物的氮素回收特征
其他题名	Nitrogen Resorption of Three Life-forms(Trees,Shrubs and Grasses)in the Semi-Arid Region of North China
	任丽昀 1; 袁志友 2; 王洪义 3; 温增军 4
来源期刊	西北植物学报
ISSN	1000-4025
出版年	2005
卷号	25 期号:3 页码:497-502
中文摘要	在位于中国北部半干旱区的多伦县选择3种不同生活型的植物,每种生活型各选取3种有代表性的植物:3种落叶乔木白桦(Betulaplatyphylla)、山定子(Malusbaccata)、山杏(Prunusarmeniaca),3种落叶灌木黄柳(Salixflavida)、山刺玫(Rosadavurica)、羊柴(Hedysarumlaeve)和3种多年生草本地榆(Sanguisorbaofficinalis)、菊叶委陵菜(Potentillatanacetifolia)、叉分蓼(Polygonumdivaricatum),对它们的氮素回收特征进行了研究.结果表明:乔木、灌木及草本3种不同生活型植物的氮素回收效率分别为43.42%、58.84%、73.76%,氮素回收水平分别为12.4mgg-1、10.7mgg-1和8.2mg*g-1.两种深根系生活型植物(乔木、灌木)的枯叶具有较高的氮素浓度(即回收水平低),并且成熟绿叶与枯叶中的氮素浓度差异较小(即回收效率低),与之相比,浅根系的多年生草本植物的枯叶具有较低的氮素浓度(即回收水平高),并且成熟绿叶与枯叶中的氮素浓度差异较大(即回收效率高).不同生活型植物氮素回收能力的差异说明了不同生活型植物对生境具有不同的氮素适应策略,另一方面,氮素回收效率和氮素回收水平可作为衡量植物氮素回收能力的两个重要参数.
英文摘要	Nitrogen resorption from senescing leaves, by minimizing N losses, could be just as uptake in determining N balance. It can increase plant N use efficiency, and may be an adaptation to N limitation. To explore the dynamics of nutrient conservation in this assemblage of plants, the main plant strategies to conserve N,i. e. N resorption efficiency and proficiency,in nine species in the semi-arid region in northern China were analyzed. It was hypothesized that the three main life-forms (trees, shrubs, and grasses) display different mechanisms of N conservation relating to their structural and functional characteristics. Three deciduous trees (Betula platyphylla,Malus baccala and Primus armeniaca), three deciduous shrubs CSalix flavida % Rosa davurica and Hedysarum laeve) and three perennial grasses (Sanguisorba ofjicinalis, Potentilla tanacetifolia and Polygonum divarication) were chosen. N resorption efficiency averaged 43. 42% > 58. 84% and 73. 76% for trees,shrubs and grasses, respectively, and N resorption proficiency averaged 12. 4 mg·g-1,10. 7 mg·g-1 and 8. 2 mg ·g-1 (respectively. However,resorption varied significantly among the life-forms. The two deep-rooted life-forms (tree and shrub) displayed high N concentration in senescing leaves (low resorption proficiency) and small differences in N concentration between mature and senescing leaves (low N resorption efficiency). In contrast,shallow-rooted perennial grasses showed high N resorption proficiency (low N concentration in senescing leaves) and high N resorption efficiency (high differences in N concentration between mature and senescing leaves). Additionally, P. tanacetifolia was individually more proficient at resorbing N than any of the other eight species. Significant differences in resorption among life-forms suggested that evolutionary history and habitat specificity be added to the list of factors known to have influence on resorption. The patterns of resorption in all species strongly indicated that efficiency and proficiency were good complementarily estimators for measuring resorption.
中文关键词	氮素 ; 回收 ; 生活型 ; 半干旱生态系统
英文关键词	nitrogen resorption life-forms semi-arid ecosystems
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:1961453
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/206772
作者单位	1.内蒙古自治区锡林郭勒盟太仆寺旗畜牧局, 太仆寺旗, 内蒙古 027000, 中国; 2.中国科学院植物研究所, 植被数量生态学重点实验室, 北京 100093, 中国; 3.东北农业大学,园艺学院, 哈尔滨, 黑龙江 150030, 中国; 4.山东省菏泽市林业局, 菏泽, 山东 274011, 中国
推荐引用方式 GB/T 7714	任丽昀,袁志友,王洪义,等. 中国北部半干旱区乔木、灌木和草本3种不同生活型植物的氮素回收特征[J]. 中国科学院植物研究所,2005,25(3):497-502.
APA	任丽昀,袁志友,王洪义,&温增军.(2005).中国北部半干旱区乔木、灌木和草本3种不同生活型植物的氮素回收特征.西北植物学报,25(3),497-502.
MLA	任丽昀,et al."中国北部半干旱区乔木、灌木和草本3种不同生活型植物的氮素回收特征".西北植物学报 25.3(2005):497-502.