科尔沁沙地灌丛内外草本植物狗尾草叶性状的比较研究

摘要/Abstract

摘要： 对科尔沁沙地小叶锦鸡儿(Caragana microphylla)灌丛内部和外部草本植物狗尾草(Setarria viridis)的主要叶性状比叶面积(SLA)、叶干物质含量(LDMC)、叶面积(AR)、叶干重(DM)、叶厚度(TH)、叶氮含量(LNC)以及叶磷含量(LPC)的变异特征进行了研究。结果表明,灌丛内外狗尾草叶性状各因子间差异较大,与灌丛外部相比,灌丛内部狗尾草的比叶面积、叶面积、叶干重和叶氮含量分别增加了47.9％,115.2％,56.3％和63.3％。而叶干物质含量、叶厚度和叶磷含量分别下降了22.1％,24.0％和34.6％,说明灌丛引起的微环境的改变影响了狗尾草的生长。所研究的叶性状因子中变异最大的是叶面积,说明狗尾草可能通过增加光合作用的叶面积以适应灌丛内部遮荫引起的光合速率的下降。叶氮含量和叶磷含量在灌丛内外的变化趋势完全相反,说明灌丛遮荫对狗尾草的养分吸收及分配产生影响,而叶氮含量在灌丛内部增加显著,可能是灌丛肥岛和遮荫的交互作用所导致。

Abstract: Plant leaf traits reflect the resource acquisition strategies of plants. Shrubs are the dominant plant life form and play an important role in Horqin sandy land. Herbaceous plants under the canopy may be affected by the shrubs. We determined the variations of leaf traits, including specific leaf area (SLA), leaf dry matter content (LDMC), leaf area (AR), dry matter (DM), leaf thickness (TH), leaf nitrogen content (LNC) per mass, leaf phosphorus content (LPC) per mass, between, under, and out of (open space) the shrubs.SLA, AR, DM, and LNC were 47.9%, 115.2%, 56.3%, and 63.3% higher respectively under the canopy of Caragana microphylla shrubs than in open space). An inverse trend was observed in three other traits (LDMC, TH, and LPC) which were 22.1%, 24.0%, and 34.6% lower respectively under this shrub canopy than in the open. The shrubs affected the growth of Setarria viridis by changing the shrub environment. Leaf area varied most among the leaf traits and this suggested that S. viridis under the shrub canopy may increase the size of photosynthetically active leaf surface area, thus offsetting the inevitable reduction in photosynthetic rate imposed by limited light supply.Shading also greatly changed the nutrient allocation and nutrient utilization efficiency, explaining the inverse change trend of LNC and LPC between, under, and out of the shrubs. The significant increase of LNC under the shrub canopy may be the result of the interaction of fertile islands and shading.

中图分类号:

毛伟,李玉霖,赵学勇,黄迎新,王少昆. 科尔沁沙地灌丛内外草本植物狗尾草叶性状的比较研究[J]. 草业学报, 2009, 18(6): 144-150.

MAO Wei,LI Yu-lin,ZHAO Xue-yong,HUANG Ying-xing, WANG Shao-kun. Effect of Caragana microphylla on leaf traits of Setarria viridis in Horqin sandy land[J]. Acta Prataculturae Sinica, 2009, 18(6): 144-150.

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