Key Laboratory of Crop Physiology, Ecology and Cultivation in Southwest China, Ministry of Agriculture, Sichuan Agricultural University, Chengdu, 611130, P. R. China.
Key Laboratory of Potato Crop Genetics and Breeding, Ministry of Agriculture, Chengdu Joyson Agricultural Technology Co., Ltd, Xingu, Chengdu, 610500, P. R. China.
J Microbiol. 2022 Feb;60(2):156-166. doi: 10.1007/s12275-022-1060-0. Epub 2022 Jan 7.
Intensive potato continuous cropping (IPCC) results in low potato yields compared with non-intensive potato continuous cropping (PCC) and potato-maize rotation (PMRC). However, it is still unclear whether the degree of potato continuous cropping obstacle is related to the soil environment formed by the previous crop. To investigate the effect of planting potatoes and planting maize after harvesting the spring potatoes on soil chemical properties and soil microbial community structure, an experiment was carried out in the same origin soil environment over a period of seven years: (a) PCC, i.e., spring planting; (b) IPCC, i.e., autumn and spring planting (IPCC); (c) PMRC, i.e., spring potatoes and summer maize (PMRC), and (d) fallow (CK). We confirmed that the potato yield under PMRC was significantly higher than that under PCC and IPCC. Under IPCC, soil total phosphorus content was significantly higher than other treatments, whereas ammonium nitrogen content was the lowest. Compared with PCC and IPCC, PMRC had a higher ammonium nitrogen content and lower total phosphorus content. The significantly different fungal taxa in IPCC (Glomerellales, Plectosphaerella, Thelebolales) may threaten the health of the plant and positive correlated with soil total phosphorus, while other microbial taxa in PMRC (Bacillales, Polythrincium, Helotiales) can mainly promotes plant nitrogen uptake and protects plants against diseases. The PMRC-promoting taxa were positively correlated with the ammonium nitrogen content and negative correlated with soil total phosphorus content. In summary, the cropping systems might have affected potato yields by changed soil microorganism community structures - especially fungal community structures - and by the chemical properties of the soils that also depends on microbes.
集约化马铃薯连作（IPCC）与非集约化马铃薯连作（PCC）和马铃薯-玉米轮作（PMRC）相比，导致马铃薯产量较低。然而，目前尚不清楚马铃薯连作障碍的程度是否与前茬作物形成的土壤环境有关。为了研究春马铃薯收获后种植马铃薯和种植玉米对土壤化学性质和土壤微生物群落结构的影响，在同一起源土壤环境中进行了为期七年的实验：（a）PCC，即春植；（b）IPCC，即秋、春植（IPCC）；（c）PMRC，即春马铃薯和夏玉米（PMRC），和（d）休耕（CK）。我们证实，PMRC 下的马铃薯产量明显高于 PCC 和 IPCC。在 IPCC 下，土壤全磷含量明显高于其他处理，而铵态氮含量最低。与 PCC 和 IPCC 相比，PMRC 具有较高的铵态氮含量和较低的全磷含量。IPCC 中明显不同的真菌类群（球囊霉目、多腔菌属、伞菌目）可能会威胁植物的健康，并与土壤全磷呈正相关，而 PMRC 中的其他微生物类群（芽孢杆菌目、多聚菌属、座囊菌目）主要促进植物氮吸收，并保护植物免受疾病侵害。PMRC 促进类群与铵态氮含量呈正相关，与土壤全磷含量呈负相关。总之，种植制度可能通过改变土壤微生物群落结构（特别是真菌群落结构）和土壤化学性质来影响马铃薯产量，而土壤化学性质又依赖于微生物。
