| Effects of planting year and stubble on alfalfa production and vegetation carbon density in Hexi Irrigation Area |
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| DOI：10.7606/j.issn.1000-7601.2024.04.24 |
| Key Words: alfalfa age of establishment stubble yield nutritional quality carbon density |
| Author Name | Affiliation | | QI Ximing | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | QI Juan | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | MENG Xiangjun | Grassland Technique Extension Station of Gansu Province, Lanzhou, Gansu 730070, China | | SHEN Liyu | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | DU Shuangshuang | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | LU Xin | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | ZHANG Xiushan | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | FU Ping | Grassland Technique Extension Station of Gansu Province, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In this study, alfalfa (Medicago sativa L.) planted 2~7 years in Hexi Desert Irrigation District was used as the research subject. By exploring the response of alfalfa hay yield, nutrient quality, and vegetative carbon density to planting year and stubble. The results showed that low\|age (<5 a) alfalfa reached higher yields in the second stubble, while high\|age (≥5 a) alfalfa had higher yields in the first stubble. Total hay yield of alfalfa in 5 a was significantly higher than in other planting years, increased by 27.81% and 27.97% compared to the lower yield years 6 a and 7 a, respectively. The index of alfalfa yield dynamic variation in 5 a was also higher. The crude protein content of alfalfa was higher in the fourth cutting, ranging from 17.67% to 19.38%. Alfalfa harvested in the fourth cutting demonstrated significantly higher relative feeding values compared to other cuttings, with increases of 75.22%, 50.91%, 39.58%, 42.68%, and 31.62%, respectively. The trend in carbon density was similar to that of yield, carbon density in 5 a alfalfa was significantly higher than other planting years, with increases of 18.58%, 27.37%, 15.30%, 25.14%, and 17.18% compared to 2 a, 3 a, 4 a, 6 a, and 7 a, respectively. As the number of mowing increased, alfalfa production with the same age gradually decreased, and both nutrient quality of alfalfa and vegetative carbon density were higher in the first stubble. A comprehensive gray correlation analysis concluded that the 2 a to 5 a after the establishment of alfalfa was a period of vigorous growth, and all of them reached higher economic and ecological benefits in the first stubble in the Hexi Desert Irrigation District. Therefore, it is important to focus on the reasonable management in the first five years and first growing stubble of alfalfa grassland, which is important for maintaining high quality and yield of alfalfa and prolonging the service life of alfalfa grassland. |
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