Yunnan Provincial Observation and Research Station of Soil Degradation and Restoration for Cultivating Plateau Traditional Chinese Medicinal Plants, Yunnan Normal University, Kunming, 650500, China.
Yunnan Provincial Renewable Energy Engineering Key Laboratory, Yunnan Normal University, Kunming, 650500, China.
Sci Rep. 2021 Mar 11;11(1):5656. doi: 10.1038/s41598-021-85171-z.
Negative plant-soil feedbacks lead to the poor growth of Panax notoginseng (Sanqi), a well-known herb in Asia and has been used worldwide, under continuous cropping. However, the key soil parameters causing the replant problem are still unclear. Here we conducted a field experiment after 5-year continuous cropping. Sanqi seedlings were cultivated in 7 plots (1.5 m × 2 m), which were randomly assigned along a survival gradient. In total, 13 important soil parameters were measured to understand their relationship with Sanqi's survival. Pearson correlation analysis showed that 6 soil parameters, including phosphatase, urease, cellulase, bacteria/fungi ratio, available N, and pH, were all correlated with Sanqi's survival rate (P < 0.05). Principal component analysis (PCA) indicated that they explained 61% of the variances based on the first component, with soil pH being closely correlated with other parameters affecting Sanqi's survival. The optimum pH for Sanqi growth is about 6.5, but the mean soil pH in the study area is 5.27 (4.86-5.68), therefore it is possible to ameliorate the poor growth of Sanqi by increasing soil pH. This study may also help to reduce the replant problem of other crops under continuous cropping since it is widespread in agricultural production.
连作导致三七（亚洲著名草药，全球范围内应用广泛）生长不良，但导致连作障碍的关键土壤参数仍不清楚。本研究通过田间试验，在 7 个小区（1.5 m×2 m）中种植了 5 年连作后的三七幼苗，小区沿存活率梯度随机排列。共测量了 13 个重要土壤参数，以了解它们与三七存活率的关系。Pearson 相关性分析表明，6 个土壤参数（包括磷酸酶、脲酶、纤维素酶、细菌/真菌比、有效氮和 pH）与三七的存活率呈正相关（P<0.05）。主成分分析（PCA）表明，前 1 个主成分可解释 61%的方差，土壤 pH 与影响三七存活率的其他参数密切相关。三七生长的最适 pH 值约为 6.5，但研究区土壤的平均 pH 值为 5.27（4.86-5.68），因此，通过提高土壤 pH 值可能改善三七的生长不良状况。由于该现象在农业生产中普遍存在，本研究可能有助于减少其他作物的连作障碍问题。
