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Copyright of Food & Fermentation Industries is the property of Food & Fermentation Industries and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To study the effects of intercropping walnut in karst area on rhizosphere soil nutrients and microecological environment, this research selected four different planting modes of walnut in the northwest Guangxi karst area as experimental subjects. The modes included intercropping walnut with mulberry(H-SS), walnut with Mahonia fortunei(H-SD), walnut with corn(H-YM), and monoculture walnuts(H-D). The physicochemical properties and microbial characteristics of the walnut rhizosphere and non-rhizosphere soils under different planting modes were analyzed using laboratory chemical experiments and Illumina Hiseq PE300 high-throughput sequencing technology. The results were as follows:(1)The walnut rhizosphere soils of different modes exhibited different degrees of enrichment in total nitrogen(TN), total phosphorus(TP), total potassium(TK), available phosphorus(AP), soil organic carbon(SOC), and exchangeable calcium, while available nitrogen(AN)showed a deficiency. Among them, H-SS showed significant enrichment effects on TN, TP, and SOC, while H-YM demonstrated the best enrichment effects on AP, AK, and exchangeable calcium.(2)Sucrase activity, microbial biomass carbon and nitrogen, and bacteria all exhibited significant rhizosphere effects, with H-YM showing the highest sucrase activity, phosphatase activity, and microbial biomass carbon. However, intercropping modes reduced the rhizosphere effects of microbial biomass nitrogen and bacteria.(3)Under the three intercropping modes, the Shannon index of rhizosphere soil bacteria was higher than that of monoculture walnuts.(4)Intercropping could enhance the diversity of rhizosphere soil bacteria. Moreover, the diversity of rhizosphere soil microorganisms was mainly influenced by nutrients, while non-rhizosphere soil was primarily affected by enzyme activities. In conclusion, intercropping can increase the enrichment ratio of rhizosphere nutrients, enhance soil enzyme activities, and promote microbial proliferation. Among the four different planting modes, H-SS shows significant enrichment effects on TN, TP, and SOC in rhizosphere soil, and it also has the highest soil bacterial content. H-YM exhibits better enrichment effects on AP, AK, and exchangeable calcium in rhizosphere soil. Therefore, in practical production, intercropping with mulberry or corn can be chosen based on local farming practices to optimize land use and improve ecological benefits. This study is of great significance for the development of sustainable agriculture in the northwest Guangxi karst area and provides a scientific basis for agricultural production and ecological conservation in similar ecological environments. Additionally, this research offers new ideas and methods for promoting agricultural modernization and facilitating the rational utilization of land resources and improvements in the ecological environment in karst area. [ABSTRACT FROM AUTHOR]

[Objective】 The effects of forest medicine intercropping on soil biochemical properties of walnut forest were analyzed to provide an important theoretical basis for ecological restoration in karst area and sustainable economic development under walnut forest. 【Method】 Four planting modes, walnut intercropping with Mahonia fortunei at initial fruit stage (CT), walnut intercropping with M. fortunei at full fruit stage (ST), walnut monoculture at initial fruit stage (CD), walnut monoculture at full fruit stage (SD) in karst area of Guangxi were used as the research object. Based on sample plot investigation and sampling, the change characteristics and correlation of soil physical and chemical properties, soil microbial quantity, microbial biomass and soil enzyme activity under the intercropping mode of walnut at different forest ages were analyzed. [Result] In CT, contents of soil total nitrogen, total phosphorus, available nitrogen, available phosphorus and organic carbon contents significantly reduced by 43.36%, 40.00%, 32.30%, 67.49% and 43.72% (P<0.05, the same as below), compared with SD mode, ST mode significantly decreased by 28.31%, 46.26%, 17.94%, 53.56% and 28.02%, respectively. The decrease of various soil nutrient contents at initial fruit period was greater than that at full fruit period. The soil nutrient content of walnut at full fruiting stage was significantly higher than that at initial fruiting stage, regardless of intercropping or single cropping. The quantity of soil bacteria, fungi and actinomycetes (12.36 × 106, 5.23 x 104 and 10.87 x 106 CFU/g, respectively) and microbial biomass carbon content (225.87 mg/kg) in SD mode were significantly higher than those in CD and CT modes. Compared with single cropping mode at full fruiting stage and initial fruiting stage, the activities of urease in soil were significantly increased by 17.32% and 40. 13%, and the activities of sucrase, phosphatase and catalase in soil were not significantly affected (P>0.05). However, the activities of sucrase in soil in ST mode were higher than those in CT mode. Correlation analysis showed that the number of soil bacteria was significantly or extremely significantly positively correlated with the contents of soil organic carbon, total nitrogen, total phosphorus and available nitrogen (P<0.01, the same as below). Both soil invertase and phosphatase activity were extremely significantly positively correlated with soil total nitrogen, available nitrogen and organic carbon content. The results of principal component analysis showed that soil nutrients content were the main influencing factors of walnut forest soil, and microorganisms played an important role in promoting soil fertility. [Conclusion] In the karst area, the intercropping mode of M. fortunei in walnut forest has a greater impact on the soil biochemical properties, especially during the initial fruit stage, the soil nutrients in the walnut forest are significantly reduced. So when walnut intercropping with M. fortunei (especially at the initial fruit stage), nitrogen and phosphorus fertilizers should be applied to ensure the nutrition supply of walnut and promote the sustainable development of walnut forest. [ABSTRACT FROM AUTHOR]

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Guangxi Normal University - Natural Science Edition is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Southern Agriculture is the property of Journal of Southern Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)