Irrigation and Nitrogen Application Promote Population Density through Altered Bud Bank Size and Components in Leymus chinensis

The bud bank of perennial grasses is a controlling factor in population dynamics and estrongly affected by soil water nitrogen status. To explore how the size its components affect shoot density under different moisture contents spring autumn. A three-full-factorial field experiment with factors treatment timing (spring autumn), rate (control 10 g N m−2 yr−1) irrigation +40 mm rainfall) was conducted Leymus chinensis (a C3 plant) northeast China. number two types buds (axillary rhizome bud), density, properties traits (rhizome length number) were determined to what changes composition influences results showed that: (1) Regardless application timing, simultaneous significantly increased promoted autumn 56.75% 47.74%, respectively. (2) dominated control axillary combined Axillary determining component increases both autumn, which associated available phosphorus, number. In summary, strongly impacted at crucial bud-bank formation stage. Agronomically, forage yield could be largely through increase using L. other rhizomatous grasses.