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采用根箱隔网套根的盆栽方法模拟研究了小麦 /大豆间作对大豆根系质外体铁库累积与利用的影响及其在改善大豆铁营养中的作用。分别用 30μm和 0 .4 5μm的尼龙网将聚氯乙烯制作的根箱分为根室和外室 (外室装土 ,根室不装土 ) ,模拟了大豆单作、小麦 /大豆间作两种情况。结果表明 :间作大豆根系质外体铁含量高于单作大豆 ,且差异达到极显著水平 ,分别用两种孔径尼龙网套根的间作大豆根系质外体铁含量都比单作的高出 2倍多 ;从而改善大豆铁营养 ,在两种孔径的尼龙网套根下 ,间作大豆新叶叶绿素含量、地上部及根系铁含量均显著高于单作大豆。此外在单、间作情况下 ,均为用 0 .4 5μm尼龙网套根的大豆根系质外体铁含量及根系铁含量显著低于 30μm尼龙网套根大豆 ,小麦根系质外体铁含量测定结果也是如此
The effects of wheat / soybean intercropping on accumulation and utilization of extracellular body iron pools in soybean root exudates and their roles in improving iron nutrition in soybean were studied by potted method with root box and netting. The root boxes made of polyvinyl chloride were respectively divided into root chamber and outer chamber (the outer chamber was filled with soil and the root chamber was not filled with soil) with nylon mesh of 30μm and 0.45μm, respectively. Simulating the two situations of soybean single crop and wheat / soybean intercropping . The results showed that the content of iron in the extracellular matrix of intercropped soybean was higher than that in monoculture, and the difference reached extremely significant level. The contents of iron in intercropped soybean intercropped with two kinds of nylon mesh were higher than those in monoculture Which could improve the iron nutrition of soybeans. The leaf chlorophyll content of intercropped soybean under two kinds of pore size nylon net was higher than that of single cropping soybean. In addition, in the case of single and intercropping, the extracellular body iron content and root iron content of soybean root system with 0.54μm nylon mesh were significantly lower than that of 30μm nylon mesh rooting system and the extracellular matrix iron content of wheat is also like this