宁南山区甘蓝垄作覆膜对土壤理化性质及微生物群落的影响

    Effects of cabbage ridge planting and film mulching on soil physical and chemical properties and microbial community in southern Ningxia mountainous areas

    • 摘要: 为明确甘蓝不同种植模式对土壤理化性质、酶活性、根际微生物多样性及其产量的影响,该研究以甘蓝品种‘中甘15号’为材料,采用二因素随机区组设计,单行不覆膜(CK)、单行白色地膜(M1)、单行黑色地膜(M2)、单行银黑双面色地膜(M3)、单行黑色全生物降解地膜(M4)、单行液态地膜(M5);双行不覆膜(SCK)、双行白色地膜(SM1)、双行黑色地膜(SM2)、双行银黑双面色地膜(SM3)、双行黑色全生物降解地膜(SM4)和双行液态地膜(SM5),12个处理3次重复,连续种植两茬(春夏茬和夏秋茬)。研究结果表明:1)春夏茬,苗期双行覆膜显著促SM3处理的根系平均直径较CK显著提高了31.6%;夏秋茬,苗期SM1处理的根总体积较CK显著提高了162.8%(P<0.05)。2)春夏茬,M3处理在苗期和莲座期土壤含水量较CK分别提高了37.4%和29.3%;夏秋茬,M1和SM3处理在莲座期分别较CK提高了35.9%和24.1%。3)春夏茬,SM4处理EC值和有机质含量分别较CK提高56.3%和7.6%;夏秋茬,SM5处理有机质含量较CK提高8.7%。4)春夏茬,SM3显著提高磷酸酶活性和脲酶活性,较CK分别提高39.0%和86.0%;夏秋茬,SM4处理磷酸酶活性较CK提高28.5%,SM3处理脲酶活性较CK提高21.7%。5)甘蓝根际土壤微生物群落多样性因种植模式和覆膜种类不同而存在差异,双行覆盖白色地膜和黑色降解地膜后提高了细菌和真菌群落生物量。6)春夏茬SM3和SM4处理较CK分别显著提高了47.5%和22.2%;夏秋茬产量整体低于春夏茬。综合来看,双行种植覆盖银黑双色地膜和黑色降解地膜处理较好,其土壤理化性状、微生物量、产量的影响有显著提高,其中甘蓝春夏茬产量高于夏秋茬,该研究可为宁南山区甘蓝高效种植提供理论依据。

       

      Abstract: Sustainable cabbage cultivation has been significantly confined to the suboptimal agronomic practices, particularly in the cold-climate vegetable production region of Xiji County, on the western foothills of Ningxia's Liupan Mountains, China. In this study, a systematic investigation was made to explore the effects of the different planting patterns on the soil physicochemical properties, enzyme activities, rhizosphere microbial diversity, and cabbage yield. Sustainable challenges were also proposed from the suboptimal practices. A field test was conducted at the Malian Township experimental base in Xiji County. The cabbage cultivar of 'Zhonggan 15' was taken as the material. A two-factor randomized block was also designed as follows. Factor 1 (planting pattern) included the ridged single-row and double-row configurations. While Factor 2 (mulch type) comprised six treatments: no mulch, white plastic, black plastic, silver-black double-colored, black fully biodegradable, and liquid film. The 12 treatments were obtained: ridged single-row no mulch (CK), ridged single-row white film (M1), ridged single-row black film (M2), ridged single-row silver-black double-colored film (M3), ridged single-row black biodegradable film (M4), ridged single-row liquid film (M5); double-row no mulch (SCK), double-row white film (SM1), double-row black film (SM2), double-row silver-black double-colored film (SM3), double-row black biodegradable film (SM4), and double-row liquid film (SM5). Each treatment was replicated three times over two consecutive growing seasons at the same field location. The spring-summer crop was transplanted on May 21, 2024, and then harvested on July 6, 2024. While the summer-autumn crop was transplanted on August 11, 2024, and harvested on October 9, 2024. Finally, an evaluation was performed on the seasonal effects on the root growth, soil moisture, physicochemical properties, enzyme activities, microbial diversity, and yield. Results demonstrated that there were significant seasonal variations. In the spring-summer seedling stage, SM3 treatment shared the superior performance, where the average root diameter increased by 31.6%, compared with the CK. In the summer-autumn seedling stage, SM1 treatments significantly increased the total root volume, thus surpassing CK by 162.8%. Soil moisture retention was varied under different treatments and growth stages. In the spring-summer crop, the M3 treatment elevated the soil moisture content by 37.4% during the seedling stage and 29.3% at the rosette stage, compared with the CK. The M1 and SM3 treatments improved the soil moisture by 35.9% and 24.1%, respectively, during the summer-autumn rosette stage. The soil properties shared the treatment-specific effects. In spring-summer, the SM4 boosted electrical conductivity (EC) by 56.3% and organic matter content by 7.6%. Summer-autumn data showed that the SM5 enhanced the organic matter by 8.7%, compared with the CK. Enzymatic activities exhibited distinct responses. Spring-summer SM3 significantly increased the phosphatase activity by 39.0% and the urease activity by 86.0%. In summer-autumn, the SM4 showed enhanced phosphatase activity by 28.5%, while the SM3 showed elevated urease activity by 21.7%, compared with the CK. There were different microbial community diversities in the cabbage rhizosphere, according to the planting patterns and mulch types. Double-row configurations with the white film (SM1) or black biodegradable film (SM4) substantially increased both bacterial and fungal biomass. In spring-summer, the SM3 and SM4 demonstrated that the optimal performance was achieved to increase the yields by 47.5% and 22.2%, respectively. The summer-autumn yields were generally lower. In conclusion, the superior agronomic strategies were observed in the double-row planting with silver-black double-colored film (SM3) and double-row planting with black biodegradable film (SM4). These treatments significantly enhanced the soil physicochemical properties, microbial abundance, and cabbage yield. Crucially, the spring-summer crop yields were consistently higher than those of the summer-autumn ones. These findings can provide a robust scientific reference to implement the efficient double-row planting with the specific film mulches. A highly effective cultivation can be expected for the cabbage production in the southern mountainous regions of Ningxia, China.

       

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