RELATIONSHIP BETWEEN MORPHOLOGICAL ADAPTATION TO GRAZING, CARBON BALANCE AND WATERLOGGING TOLERANCE IN CLONES OF DACTYLIS GLOMERATA L.
RELATIONSHIP BETWEEN MORPHOLOGICAL ADAPTATION TO GRAZING, CARBON BALANCE AND WATERLOGGING TOLERANCE IN CLONES OF DACTYLIS GLOMERATA L.
复制标题
鸭茅无性系放牧形态适应与碳平衡及耐涝性的关系。
DOI：
10.1111/j.1469-8137.1984.tb04154.x
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发表时间：
1984
期刊：
影响因子：
9.4
通讯作者：
J. Etherington
中科院分区：
文献类型：
--
作者：
J. Etherington
总结
鸭茅无性系繁殖个体。采用土壤培养法，对不放牧的湿润土壤和放牧的干旱土壤两种不同生境的3种不同类型的水稻进行了耐涝性试验。干燥土壤的克隆出乎意料地证明比潮湿土壤的克隆更耐受。对24个居群的D.在实验花园中生长的小球表明，原始栖息地的放牧压力在花园生长的植物的形态中反映得非常强烈。适应放牧包括一个短而窄的叶，多产分蘖的习惯与生产非常短的花序。过度放牧，或在水涝试验中实施的砍伐制度，可能会对未放牧场地的直立长叶变种造成更大的损害。在完整的植物和落叶分蘖碳平衡的测量支持这一解释，也表明，较大的耗氧量的大量叶基地的未放牧的形式可能会限制根渗透在缺氧条件下。在干土无性系的根更长的讨论作为一个可能的适应缺水的悬崖壁栖息地。
Summary
Clonally-propagated individuals of Dactylis glomerata L. derived from two contrasted habitats, respectively, moist soil with no grazing and drought-prone soil under intense grazing, were tested for tolerance of waterlogging in soil culture. The clone of dry soil unexpectedly proved much more tolerant than the clone of moist soil. Measurements of 24 populations of D. glomerate grown in an experimental garden showed that the grazing pressure in the original habitat is reflected very strongly in the morphology of the garden-grown plants. Adaptation to grazing comprises a short and narrow-leaved, prolific tillering habit with production of very short inflorescences. Heavy grazing, or the cutting regime imposed in the waterlogging trial, is likely to do more damage to the upright, long-leaved morphs of the ungrazed site. Measurements of carbon balance in intact plants and in defoliated tillers support this interpretation and also suggest that the larger oxygen consumption of the massive leaf bases of the ungrazed form might limit root penetration in oxygen deficient conditions. The greater length of roots in the dry soil clone is also discussed as a possible adaptation to water shortage in its cliff ledge habitat.