混种不同生态型富集植物对镉胁迫樱桃幼苗磷钾养分吸收的影响

The Effects of Different Ecotypes of Intercropped Accumulator Plants on Nutrient Absorption of Cherry Seedlings under Cadmium Stress

为研究混种不同生态型富集植物(矿山生态型和非矿山生态型)对镉胁迫条件下樱桃植株养分吸收的影响,通过盆栽试验研究镉胁迫樱桃(甜心樱桃、那翁樱桃)与采自铅锌矿区(镉污染土)和农田(非污染土)的小飞蓬、龙葵和马唐混种对其根系和地上部分全磷和全钾含量的影响。结果表明,樱桃与小飞蓬混种后磷钾含量明显高于与龙葵、马唐混种的含量,且矿山生态型小飞蓬要优于农田生态型小飞蓬。就甜心樱桃而言,与矿山生态型小飞蓬混种后根系磷钾含量分别增加了7.89%、25.56%,地上部分磷钾含量分别增加了29.54%、60.38%;就那翁樱桃而言,与矿山生态型小飞蓬混种后根系磷钾含量分别增加了5.37%、15.67%,地上部磷钾含量分别增加了16.17%、56.52%。因此,樱桃与矿山生态型小飞蓬混种最有利于其对磷钾养分的吸收。另外,除矿山生态型马唐外,其他不同生态型小飞蓬、龙葵以及农田生态型马唐在与樱桃混种后,磷钾含量都有不同程度的增加。混种后,所有植物生物量都有不同程度的减少。

To study the effects of different ecotypes （mining and non-mining ecotypes） of accumulator plants on nutrient absorption of cherry under cadmium stress, a pot experiment was conducted to study the total phosphorus and total potassium contents in roots and shoots of cherry （Tianxin cherry and Naweng cherry） affected by Conyza canaclensis L, Cronq., Solanurn nigrum L. and Digitaria sanguinalis L. Scop. under cadmium stress, which were collected from the lead-zinc diggings （cadmium-contaminated soil ） and farmland （clean soil） .The results showed that the total phosphorus and total potassium contents in roots and shoots of cherry intereropped with C.canadensis were higher than those intercropped with S. nigrum or D. sanguinalis, and mine C. canadensis was better than farmland C. canadensis.For Tianxin cherry intercropped with ecotype of mine C. canadensis,the total phosphorus and total potassium contents in root increased by 7.89%, 25.56% compared with that of monoculture respectively, and increased by 29.54%, 60.38% in shoots respectively. For Naweng cherry intercropped with ecotype of mine C. canadensis, the total phosphorus and total potassium contents in root increased by 5.37%, 15.67% compared with that of monoculture respectively, and increases by 16.17%, 56.52% in shoots respectively.So the cherry intercropped with ecotype of mine C. canadensis is the best.Furthermore, except for ecotype of mine D. sanguinalis, in the other different ecotypes of accumulators, the total phosphorus and total potassium contents increased after being intercropped with cherry, and the biomass of all plants reduced in varying degrees.