根系形态和分布对土壤中养分和水分的吸收有重要影响。增加耐密性是现代玉米(Zea may L.)育种的主要方向,而耐密性与根系的关系尚了解不多。本文以70年代主推的2个不耐密型品种(中单2号与丹玉13)和2个当代耐密型现代品种(先玉335和郑单9...根系形态和分布对土壤中养分和水分的吸收有重要影响。增加耐密性是现代玉米(Zea may L.)育种的主要方向,而耐密性与根系的关系尚了解不多。本文以70年代主推的2个不耐密型品种(中单2号与丹玉13)和2个当代耐密型现代品种(先玉335和郑单958)为材料,将田间试验和室内水培试验相结合,在3个密度水平下,研究了不同耐密性玉米品种的根系差异及其对种植密度的响应。结果表明,目前推广的耐密型品种的根系要小于不耐密的老品种。不同耐密性品种之间的差异主要表现在0—40 cm。随着密度的增加,根显著变小、变细。密度主要降低0—20 cm土层中的根系生长,对深层根系影响较小。先玉335和中单2的根系长度对密度的反应较弱,郑单958和丹玉13较强。这说明先玉335主要依靠其小根系适应高密度,而郑单958既依靠较小的根系,同时依靠较高的根系反应性适应高密度。展开更多
This paper investigated spatial distribution of Zanthoxylum bungeanum fine roots,which were sampled by excavating monoliths.The results showed that the root length density,surface area,volume as well as biomass were d...This paper investigated spatial distribution of Zanthoxylum bungeanum fine roots,which were sampled by excavating monoliths.The results showed that the root length density,surface area,volume as well as biomass were decreased with an increase in depth from 20 cm to 100 cm.The roots mainly distributed in 0～40 cm in the verticality,and the root length density,surface area,volume as well as biomass amounted to 72.0%,65.6%,59.2% and 57.5% of the corresponding total amount.Minimum and maximum of specific root length were respectively exhibited at 0～10 cm and 70～80 cm in the verticality.In addition,the root horizontal distribution reached to 110 cm,however most fine roots distributed within 50 cm and the horizon.And the root length density and biomass accounted for 71.5% and 76.4% of the total amount respectively.The minimum and the maximum of specific root length were exhibited at 10～20 cm and 70～80 cm in the horizon.展开更多
文摘根系形态和分布对土壤中养分和水分的吸收有重要影响。增加耐密性是现代玉米(Zea may L.)育种的主要方向,而耐密性与根系的关系尚了解不多。本文以70年代主推的2个不耐密型品种(中单2号与丹玉13)和2个当代耐密型现代品种(先玉335和郑单958)为材料,将田间试验和室内水培试验相结合,在3个密度水平下,研究了不同耐密性玉米品种的根系差异及其对种植密度的响应。结果表明,目前推广的耐密型品种的根系要小于不耐密的老品种。不同耐密性品种之间的差异主要表现在0—40 cm。随着密度的增加,根显著变小、变细。密度主要降低0—20 cm土层中的根系生长,对深层根系影响较小。先玉335和中单2的根系长度对密度的反应较弱,郑单958和丹玉13较强。这说明先玉335主要依靠其小根系适应高密度,而郑单958既依靠较小的根系,同时依靠较高的根系反应性适应高密度。
文摘This paper investigated spatial distribution of Zanthoxylum bungeanum fine roots,which were sampled by excavating monoliths.The results showed that the root length density,surface area,volume as well as biomass were decreased with an increase in depth from 20 cm to 100 cm.The roots mainly distributed in 0～40 cm in the verticality,and the root length density,surface area,volume as well as biomass amounted to 72.0%,65.6%,59.2% and 57.5% of the corresponding total amount.Minimum and maximum of specific root length were respectively exhibited at 0～10 cm and 70～80 cm in the verticality.In addition,the root horizontal distribution reached to 110 cm,however most fine roots distributed within 50 cm and the horizon.And the root length density and biomass accounted for 71.5% and 76.4% of the total amount respectively.The minimum and the maximum of specific root length were exhibited at 10～20 cm and 70～80 cm in the horizon.
