小浪底低山丘陵区植物N素吸收特征及其与土壤因子的关系  

Plant nitrogen resorption characteristic and it's relation with soil factors in Xiaolangdi mountainous hilly region

作　　者：赵勇[1] 樊巍[2] 范国强[1] 

机构地区：[1]河南农业大学环境系,450002 [2]河南省林业科学研究院,郑州450003

出　　处：《中国水土保持科学》2006年第6期81-87,共7页Science of Soil and Water Conservation

基　　金："十一五"国家科技支撑项目"华北土石山区植被恢复与重建技术试验示范";河南省科技攻关项目"典型退化生态系统恢复;重建机理及生态工程设计示范研究"(0624090010)

摘　　要：为探寻温带地区山地植物N素保存策略，找出影响植物N素回收率的环境因子，以便了解植物保持所吸收养分的机制，以小浪底库区山地为例，研究该区域3种生活型21种典型植物成熟绿叶中的N素含量、枯叶中N素含量以及N素回收效率（NRE）。结果表明：植物成熟绿叶中的N素含量和枯叶中N素含量有显著的正相关关系；所测定的21种植物NRE在17，4％～50．1％之间，平均值为28-8％，多数种的回收效率低于40％。测定的21种植物都属于N素回收不完全植物。不同生活型的植物其回收效率有显著的差异，一般表现为草本〉灌木〉乔木。植物叶片N素含量与土壤有机质，上壤N素含量和土壤含水量呈显著正相关；而NRE与土壤有机质、土壤N素含量和土壤含水量呈显著负相关关系。说明在研究区不利的土壤条件，可以导致植物NRE的提高，植物在不利的环境条件下。可以通过提高NRE等途径来应对环境的胁迫。In order to figure out the conservation strategies of plant nitrogen in different plant species in temperate zone and to find out the environmental and plants related mechanisms in regulating nitrogen resorption of these species, nitrogen concentration in mature leaves and senescing leaves and nitrogen resorption efficiency （NRE） of 21 plant species belonging to three different life-forms were studied in Xiaolangdi hilly areas, Henan Province,centre of China. The results showed that a significant positive linear correlation was found between nitrogen content in senescing and in mature leaves of all life-forms. The majority of the 21 investigated species in study sites withdrew less than 40 % of nitrogen from their senescing leaves. NRE in these species ranged from 17.4% to 50.1%, with an average of 28.8%, depending upon the species and the life-form. The pattern of NRE in different life-forms followed the order of herbs 〉 shrubs 〉 trees. The results show that most of species examined in this study can be categorized as incomplete nitrogen resorption plants. Nitrogen concentration in mature leaves （Ns） and nitrogen concentration in senescing leaves （Ns）increased with increasing soil organic matter, total soil nitrogen and soil moisture. However, NRE was negative related to soil organic matter, total soil nitrogen and soil moisture, meaning that the higher soil organic matter was due to reduce plants NRE. Therefore, it is likely that plants from infertile environments may have a higher NRE than those from fertile environment. In disadvantage condition, such as soil infertile, the plants can adapt environmental stress by increasing NRE in mountainous hilly region in north china.

关 键 词：植物叶片N素 生活型 N素回收效率 环境胁迫 低山丘陵区 

分 类 号：S792.39[农业科学—林木遗传育种]