摘要
采用二因素五水平回归最优设计、砂培，两种ｐＨ环境（ｐＨ１５．６～５．８，ｐＨ２７．６～７．８），研究了Ｂ，Ｃａ不同浓度对柠檬幼苗生长、叶片叶绿素含量、光合强度及根系活力的影响，建立了相应的数学模型。结果表明，Ｂ，Ｃａ缺乏或过量降低叶绿素含量和光合强度。叶绿素含量最大时的叶Ｃａ／Ｂ分别为ｐＨ１下４９１，ｐＨ２下２９３；光合强度最大时的叶Ｃａ／Ｂ分别为ｐＨ１下５２５，ｐＨ２下２８５。Ｂ，Ｃａ浓度适量下降提高了根系活力，而Ｂ，Ｃａ浓度过量抑制了其活力，碱性环境的根系活力明显低于酸性环境。
In a sand culture (pH 5.6～5.8 or 7.6～7.8), the optimized regression design with two factors at five levels was adopted to in vesitigate the effects of different concentrations of B and Ca in the media on the growth, chlorophyll in the leaf, photosynthetic rates and root vigor of limon seedlings. Based on the results of determinations, a few mathematical models were established. Inadequate or excessive B and Ca decreased chlorophyll content and photosynthetic rate.With a Ca/B ratio of 491 in the leaf at pH 5.6～5.8 or of 293 at pH 7.6～7.8, the chlorophyll content reached its maximum; and with a Ca/B ratio of 525 in the leaf at pH 5.6～5.8 or of 285 at pH 7.6～7.8, photosynthesis showed the maximum rate. A moderate drop in B and Ca concentration increased root vigor, while excessive B and Ca depreesed root vigor. Under the alkali condition, the root vigor was significantly lower than under the acid condition.
出处
《西南农业大学学报（自然科学版）》
CSCD
1998年第4期315-320,共6页
Journal of Southwest Agricultural University
关键词
硼
钙
砂培
柠檬
幼苗
光合作用
根系活力
boron
calcium
sand cultures
citrus limon seedling
photosynthesis
root systems vital
