CAJ | 학술논문

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.
대과이심사지소협금계인(Caragana microphylla)관총내부화외부초본식물구미초(Setarria viridis)적주요협성상비협면적(SLA)、협간물질함량(LDMC)、협면적(AR)、협간중(DM)、협후도(TH)、협담함량(LNC)이급협린함량(LPC)적변이특정진행료연구.결과표명,관총내외구미초협성상각인자간차이교대,여관총외부상비,관총내부구미초적비협면적、협면적、협간중화협담함량분별증가료47.9%,115.2%,56.3%화63.3%.이협간물질함량、협후도화협린함량분별하강료22.1%,24.0%화34.6%,설명관총인기적미배경적개변영향료구미초적생장.소연구적협성상인자중변이최대적시협면적,설명구미초가능통과증가광합작용적협면적이괄응관총내부차음인기적광합속솔적하강.협담함량화협린함량재관총내외적변화추세완전상반,설명관총차음대구미초적양분흡수급분배산생영향,이협담함량재관총내부증가현저,가능시관총비도화차음적교호작용소도치.
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.