| Effects of alfalfa intercropping on water\|carbon balance and growth of one- and two\|year\|old Chinese sea buckthorn |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2025.04.14 |
| Key Words: sea buckthorn\|alfalfa intercropping system Chinese sea buckthorn planting age interspecific water relation non\|structural carbohydrates (NSC) growth of young trees |
| Author Name | Affiliation | | DAI Yongxin | College of Forestry, Shanxi Agricultural University, Taigu, Shanxi 030801, China | | LIU Yongqiang | College of Forestry, Shanxi Agricultural University, Taigu, Shanxi 030801, China | | LIU Siyu | College of Forestry, Shanxi Agricultural University, Taigu, Shanxi 030801, China | | SONG Wen | College of Forestry, Shanxi Agricultural University, Taigu, Shanxi 030801, China | | WANG Lin | College of Forestry, Shanxi Agricultural University, Taigu, Shanxi 030801, China |
|
| Hits: 6 |
| Download times: 1 |
| Abstract: |
| To investigate interspecific water and nutrient competition or reciprocity in a silvopastoral system intercropping Chinese sea buckthorn (Hippophae rhamnoides L. subsp. sinensis Rousi) with alfalfa (Medicago sativa L.), one- and two\|year\|old Chinese sea buckthorn plants were used as research materials. Three treatments were established: monoculture; intercropping with alfalfa; and intercropping with shade exclusion, where alfalfa was isolated using wire mesh to eliminate its shading effect. Measurements were taken in July (during the drought period) and September (during the wet period) in 2023, including soil moisture content, branch predawn and midday water potential, leaf total nitrogen content, leaf photosynthetic indices, non\|structural carbohydrate (NSC) content in branches and leaves, and overall plant growth. Results showed that: In July, compared with the monoculture treatment, the soil moisture content and branch predawn water potential of the 1\|year\|old sea buckthorn under intercropping and intercropping with shade exclusion treatments were significantly lower, with soil moisture content being reduced by 22.04% and 19.12%, and branch predawn water potential reduced by 76.32% and 71.05%, respectively. The net photosynthetic rate and branch phloem NSC content of intercropping treatment decreased by 85.82% and 33.17%, respectively. In the 2\|year\|old sea buckthorn, there were no significant changes in predawn water potential and the non\|structural carbohydrate (NSC) content in branch phloem and xylem under either intercropping or intercropping with shade exclusion treatments. Under the intercropping treatment, leaf total nitrogen content and leaf non\|structural carbohydrate (NSC) content increased by 11.67% and 74.24%, respectively. Under the intercropping with shade exclusion treatment, the leaf net photosynthetic rate and total nitrogen content increased by 24.76% and 11.56%, respectively. In September, compared with the monoculture treatment, there were no significant changes in soil moisture content and branch predawn water potential of 1- and 2\|year\|old sea buckthorn in the agroforestry systems. The leaf NSC contents of 1\|year\|old sea buckthorn under intercropping and intercropping with shade exclusion treatments decreased by 52.09% and 41.55%, while the leaf NSC content of the 2\|year\|old sea buckthorn had no significant change. The 1\|year\|old branch length of sea buckthorn was reduced by 66.96% and 57.76% under intercropping and intercropping with shade exclusion treatments, respectively. Similarly, the branch base diameter decreased by 53.64% and 45.06% under the same treatments. There was no significant difference in the branch growth indexes among the three treatments of 2\|year\|old sea buckthorn. The 1\|year\|old branch length and leaf mass per area were significantly positively correlated with the net photosynthetic rate and the phloem NSC content in July, respectively. The phloem NSC content in July was extremely significantly positively correlated with the total nitrogen content of leaves. The results suggest that interspecific water competition in the 2\|year\|old sea buckthorn silvopastoral system was significantly alleviated, enhancing nitrogen absorption in sea buckthorn. This, in turn, promoted photosynthesis and non\|structural carbohydrate (NSC) storage, ultimately benefiting the growth of sea buckthorn. |
|
|
|