丛枝菌根化香椿幼苗对干旱胁迫的生长响应

Responses of Growth in Toona sinensis Seedlings Colonized by Arbuscular Mycorrhizal Fungi to Drought Stress

通过菌根接种技术,研究干旱胁迫下丛枝菌根化香椿幼苗的生长及N、P元素含量的变化。结果表明:干旱胁迫下,丛枝菌根化香椿幼苗的苗高、地径与未接种处理相比,均显著增加了,且随着胁迫程度增加苗木生长增值越大。接种丛枝菌根真菌,对香椿幼苗整株N含量影响不大,但明显增加了全株P含量。在不同程度干旱胁迫下,以W1干旱胁迫处理下(田间持水量40%),菌根化香椿幼苗根、茎、叶及全株P含量最高。这说明,接种丛枝菌根能有效促进苗木的生长和对养分的吸收,且干旱胁迫程度越重,效果越明显。

The growth and content of nitrogen and phosphorus in Toona sinensis seedlings colonized by ar- buscular mycorrhizal fungi under drought stress were inves Results showed that there were remarkable increments in tigated using arbuscular mycorrhiza inoculation. the height and ground diameter of T. sinensis seedlings colonized by arbuscular mycorrhizal fungi under drought stress compared with non-inoculation treatments. Furthermore, the increments were greater with the development of drought stress. The effect of arbuscular mycorrhiza inoculation on N content in the whole plant of seedlings was not great, while that on P content in the whole plant of seedlings was observable. The content of P in root, stem, leaf and the whole plant of seedlings colonized by arbuscular mycorrhizal fungi under the drought stress treatment of W1 （40% of field moisture capac This indicated that the growth and arbuscular stress. mycorrhiza inoculation ity） was the highest in terms of different treatments of drought stress. nutrients absorption for seedlings are able to be effectively improved by and the improvements will be amplified by the much serious drought