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黄土高原退耕优势种柠条叶属性的环境响应特征

发表时间:2013-03-15  浏览量:962  下载量:351
全部作者: 龚春梅,白娟,赵秋琳
作者单位: 西北农林科技大学生命科学学院
摘 要: 植物叶属性特征是具有进化意义的环境适应参数,包括比叶面积(specific leaf area,SLA)、氮(N)、磷(P)含量和净光合速率等。研究拟通过对降水梯度上柠条(Caragana korshinskii)的上述叶属性特征进行系统对比分析,探讨作为黄土高原优势植物柠条生长发育主要限制因子的水分对柠条叶属性特征的影响程度。采用野外调查和室内分析相结合的手段,获得以下主要结果:随着干旱胁迫的加剧,杨凌柠条SLA最大,其余研究区的柠条SLA均较低;各研究区柠条叶片SLA和净光合速率呈负相关,杨凌柠条的净光合速率最低,其次是黄陵,而安塞、榆林和神木均较高;从杨凌到神木,植物N∶P值变化不明显,而且杨凌柠条N,P含量与柠条N∶P值的相关性均不高,但黄陵和榆林柠条的N含量与柠条N∶P值呈显著正相关,而安塞和神木柠条P含量与柠条N∶P值呈显著负相关。降水梯度上的各研究区柠条叶属性特征呈现特有的规律性变化。
关 键 词: 植物学;柠条;黄土高原;叶属性;环境响应
Title: Environmental response characteristics of leaf traits in the dominant farmland species Caragana korshinskii of Loess Plateau
Author: GONG Chunmei, BAI Juan, ZHAO Qiulin
Organization: College of Life Science, Northwest A&F University
Abstract: The plant leaf traits are characterized by the evolutionary parameters of adaptation to the environments, including specific leaf area (SLA), N, P content and net CO2 assimilating rate and so on. In this paper, the system comparison analysis on leaf characteristics of Caragana korshinskii along the precipitation gradient was carried out, and the influence of water which is the main limiting factor as plant growth and development on leaf traits of Loess Plateau was determined. Through the combination of field investigation with laboratory analysis, we obtained the following results: SLA of C.korshinskii was the largest in Yangling, but it was relatively lower in the rest trial sites with the increasing drought stress. Furthermore, SLA and net CO2 assimilating rate was negatively correlated among several trail sites, and the net CO2 assimilating rate was the lowest in Yangling, followed by Huangling. However, it was relatively higher in Ansai, Yulin and Shenmu. In addition, plant N∶P value hadn’t significant changes along trial sites, and the correlation between N, P content and N∶P value was not significant in Yangling, but the N content and N∶P value were positively correlated significantly in Huangling and Yulin, and the P content was significantly negatively correlated with N∶P value in Ansai and Shenmu. The leaf traits of C.korshinskii presented unique regular changes along trial sites with the precipitation gradient.
Key words: botany; Caragana korshinskii; Loess Plateau; leaf traits; environmental response
发表期数: 2013年3月第5期
引用格式: 龚春梅,白娟,赵秋琳. 黄土高原退耕优势种柠条叶属性的环境响应特征[J]. 中国科技论文在线精品论文,2013,6(5):468-475.
 
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