生态系统恢复后干热河谷植物叶片N、P、K含量及物种优势度的变化  

Changes of plant leaf N, P, and K concentrations and species dominance in an arid-hot valley after ecosystem restoration

作　　者：闫帮国[1] 何光熊[1] 李纪潮[1] 钱坤建[1] 奎建蕊[1] 潘志贤[1] 史亮涛[1] 纪中华[1] 

机构地区：[1]云南省农业科学院热区生态农业研究所,云南元谋651300

出　　处：《应用生态学报》2013年第4期956-960,共5页Chinese Journal of Applied Ecology

基　　金："十二五"国家科技支撑计划项目(2011BAC09B05);云南省科技计划项目(2011CA009);云南省自然科学基金项目(2011FZ219);云南省农业科学院热区生态农业研究所所长基金项目(RQS-2011-1-13)资助

摘　　要：以金沙江干热河谷生态系统为对象,通过对比恢复区与对照区(干扰区)的植物叶片N、P、K含量、比值及其与优势度的关系,研究了生态系统恢复对植物叶片化学计量特征的影响.结果表明:生态系统恢复显著降低了植物叶片的N、P含量以及P/K,对K含量无显著影响.其中,恢复区内植物叶片N、P、K含量均值分别为10.405、0.604和9.619g·kg-1,比对照区分别下降了16.9%、34.9%和4.7%.恢复区中植物优势度与叶片P含量间呈极显著负相关,而对照区植物优势度与叶片K含量的负相关关系最显著.生态系统恢复改变了N、P、K之间标度关系的斜率和截距.而恢复区与对照区同一物种间叶片N、P含量差别不显著.研究区植物叶片化学计量特征的改变主要是由群落物种替代引起的.Taking the arid-hot valley of Jinsha River, Southwest China as the object, a comparative study was made on the plant leaf N, P, and K concentrations and ratios as well as their relation- ships with species dominance in the restoration area and disturbed area, aimed to understand the effects of ecosystem restoration on the plant leaf stoicboimetric characteristics. Ecosystem restoration decreased the plant leaf N and P concentrations and P/K ratio significantly, but had lesser effects on the plant leaf K concentration. In restoration area, the plant leaf N, P, and K concentrations were averagely 10.405, 0. 604, and 9. 619 g·kg^-1 , being 16.9%, 34.9%, and 4.7% lower than those in disturbed area, respectively. In restoration area, species dominance was significantly negatively correlated with plant leaf P concentration; while the species dominance in disturbed area had a significant negative correlation with plant leaf K concentration. Ecosystem restoration altered the slope and intercept of the scaling relationships among the plant leaf N, P, and K, No significant differences were observed in the leaf N, P, and K concentrations of the same plant species between restoration area and disturbed area, suggesting that the changes of plant leaf stoichiometric charac- teristics were mainly driven by the shift of species composition in the plant community.

关 键 词：生态化学计量学 氮 磷 钾 生态系统恢复 金沙江干热河谷 

分 类 号：Q948.11[生物学—植物学]