Yang Kuan, Wang Huiling, Luo Lifen, Zhu Shusheng, Huang Hongping, Wei Zhaoxia, Zhu Youyong, Guo Liwei, He Xiahong
State Key Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Agricultural University, Kunming, Yunnan, 650201, China; Key Laboratory of Agro-Biodiversity and Pest Management of Education Ministry of China, Yunnan Agricultural University, Kunming, Yunnan, 650201, China.
State Key Laboratory for Conservation and Utilization of Bio-Resources, Yunnan Agricultural University, Kunming, Yunnan, 650201, China; Key Laboratory of Agro-Biodiversity and Pest Management of Education Ministry of China, Yunnan Agricultural University, Kunming, Yunnan, 650201, China.
J Environ Manage. 2023 Mar 1;329:117069. doi: 10.1016/j.jenvman.2022.117069. Epub 2022 Dec 28.
The under-forest economy in the agroforestry system can improve land use efficiency, protect ecological environment, and promote arable land sustainable development. However, the effects of soil moisture in the forest and irrigation strategies on the healthy growth of intercropping crops are still incomplete. Here, considering the organic Panax notoginseng cultivated under pine forests (PPF) as the research object, we explored the effects of different soil moisture on the physiological state, yield, quality and disease occurrence of PPF. Our results suggested that 80-85% and 95-100% field capacity (FC) treatments were more conducive to increased photosynthetic rate and biomass accumulation of PPF, but 50-55% and 65-70% FC treatments were more conducive to the accumulation of saponins in PPF leaves. Notably, the root rot index of PPF was highest under 95-100% FC (19.51) treatment, significantly higher than that under 65-70% FC (8.44) and 80-85% FC (10.21) treatments. Further, the rhizosphere microorganisms of PPF under different soil moisture treatments were sequenced, and the sequencing data analysis revealed that high soil moisture (95-100% FC) could destroy the microbial diversity balance and cause the accumulation of pathogens (Fusarium oxysporum and Ilyonectria radicicola), leading to a high incidence of root rot. The incidence of PPF root rot was negatively correlated with rhizosphere microbial diversity. Overall, our results highlight that the quantitative irrigation (80-85% FC) is conducive to maintaining the balance between yield, saponin content and disease occurrence of PPF, providing a practical basis for PPF irrigation strategy and promoting the sustainable development of PPF agroforestry system.
农林复合系统中的林下经济能够提高土地利用效率、保护生态环境并促进耕地可持续发展。然而，森林土壤水分及灌溉策略对间作作物健康生长的影响仍不明确。在此，以松林下种植的有机三七（PPF）为研究对象，我们探究了不同土壤水分对PPF生理状态、产量、品质及病害发生情况的影响。我们的结果表明，80 - 85%和95 - 100%田间持水量（FC）处理更有利于提高PPF的光合速率和生物量积累，但50 - 55%和65 - 70% FC处理更有利于PPF叶片中皂苷的积累。值得注意的是，PPF的根腐病指数在95 - 100% FC（19.51）处理下最高，显著高于65 - 70% FC（8.44）和80 - 85% FC（10.21）处理。此外，对不同土壤水分处理下PPF的根际微生物进行了测序，测序数据分析表明，高土壤水分（95 - 100% FC）会破坏微生物多样性平衡并导致病原菌（尖孢镰刀菌和放射状丝核菌）积累，从而导致根腐病高发。PPF根腐病的发病率与根际微生物多样性呈负相关。总体而言，我们的结果表明定量灌溉（80 - 85% FC）有利于维持PPF产量、皂苷含量和病害发生之间的平衡，为PPF灌溉策略提供了实践依据，并促进了PPF农林复合系统的可持续发展。
