Growth and carbon allocation of Agropyron desertorum following autumn defoliation
Growth and carbon allocation of Agropyron desertorum following autumn defoliation
复制标题
秋季落叶后沙草的生长和碳分配
DOI：
10.1007/bf00317153
复制
发表时间：
1992
期刊：
影响因子：
2.7
通讯作者：
J. Rose
中科院分区：
文献类型：
--
作者：
Richard Miller;J. Rose
研究了1988、1989年秋季冷季型草坪草新分蘖落叶后的生长和碳素分配。以分蘖密度和死亡率、生殖枝密度、根密度、生物量、单株分蘖重、碳分配和土壤水分耗竭为评价指标。荒漠到秋季放牧。秋季落叶处理由于秋季落叶后分蘖发育停止，两年的分蘖再生量均低于对照。秋季去叶也显着降低了~(13)C向根的迁移，但在中未见显着降低。1989年，土壤更加凉爽和干燥。其他植物生长指标和土壤水分耗竭速率在不同处理之间没有差异。1988年秋季的落叶不影响次年秋季的分蘖补充。连续两年的秋伐不影响分蘖越冬死亡率和1990年的高峰期现存量。
Growth and carbon allocation of a cool season tussock grass,Agropyron desertorum, following defoliation of newly initiated tillers in the autumn of 1988 and 1989 were investigated. Tiller density and mortality, reproductive shoot density, root density, biomass, individual tiller weight, carbon allocation, and soil water depletion were used to evaluate the response ofA. desertorumto autumn grazing. Tiller recruitment was lower in the autumn-defoliated treatment in both years compared with the control because of the cessation of tiller development following autumn defoliation. Autumn defoliation also significantly reduced the movement of13C to the roots in 1988 but not in 1989. Soils were cooler and drier in 1989. Other plant growth measurements and soil water depletion rates were not different between treatments. Autumn defoliation in 1988 did not influence tiller recruitment in the following autumn. Two consecutive years of autumn defoliation did not affect tiller overwinter mortality or peak standing crop in 1990.