不同生境羊草营养枝叶龄进程与地上生物量关系的研究

The leaf age progression of vegetative shoots and its relationship with aboveground biomass of Leymus chinensis in different habitats

对不同生境羊草营养枝叶龄进程及其与地上生物量的关系进行了研究,结果表明,人工草地和天然草地羊草营养枝叶龄进程季节动态是基本一致的,但因不同生境出叶速度的差异,使人工草地羊草营养枝的叶龄为11.3,比天然草地增加了16.5%。不同生境羊草营养枝的叶龄与叶片长度、宽度和叶片大小的关系均符合二次多项式的变化规律,人工草地和天然草地叶片最大时的叶龄指数分别为61.95和61.86,具有相对稳定的值;虽然叶龄与株高和单株干物重间均呈一元线性极显著的正相关关系,但每龄叶增加的植株高度和单株干物重因生境不同而异。

This paper looks at the leaf age progression of vegetative shoots and its relationship with aboveground biomass for Leymus chinensis in different habitats. The results showed that the seasonal dynamics of vegetative-shoot leaf age progression of L. chinensis for artificial and natural grassland were essentially the same. However, the speed of leaf emergence varied with habitat, leading to a vegetative-shoot leaf age on artificial grassland of 11.3, 16.5% over that of natural grassland. The relationships between leaf age and leaf length, width, and size of vegetative shoots in different habitats could all be described by quadratic polynomial equations. When leaves were the largest, leaf age indices were 61.95 and 61.86, for artificial and natural grassland, respectively, and these values were relatively stable. There were highly significant positive correlations between leaf age and plant height and leaf age and individual-shoot dry weight, which could be described by linear regression (equations,) but the increases in plant height and individual-shoot dry weight differed with habitat.