兰州大学机构库 >草地农业科技学院
Water competition among the coexisting Platycladus orientalis, Prunus davidiana and Medicago sativa in a semi-arid agroforestry system
Chen, Zhixue1,2,3; Wang, Guohui1,2,3; Yang, XL(杨宪龙)1,2,3; Li, Zhenfeng4; Shen, YY(沈禹颖)1,2,3
2023-04-01
Source PublicationAGRICULTURAL WATER MANAGEMENT   Impact Factor & Quartile
ISSN0378-3774
Volume279
AbstractAgroforestry has been widely used for the ecological restoration construction of semi-arid regions of the Chinese Loess Plateau. Investigating plant water sources is crucial for understanding the key ecohydrological processes of plant root water uptake and the water relations between coexisting plants. Clarifying the plant water use strategies can help to assess the sustainability of the vegetation restoration in agroforestry systems and provide references for the vegetation management. Thus, we investigated the water use characteristics of plants in an agroforestry system consisting of Platycladus orientalis, Prunus davidiana and Medicago sativa. The δD and δ18O of plant stem water and soil water in the 0–300 cm layer were measured. The MixSIAR model and proportional similarity (PS) were used to quantify the proportion of soil water absorbed by the plants in each layer and the hydrological niche overlap of plants. The results showed that the combined effects of rainfall recharge and evapotranspiration (ET) loss resulted in a decrease in soil water content (SWC) for the agroforestry system with increasing soil depth, and the SWC of the deep layer (80–300 cm) had minor variability (6.1–7.1%) throughout the study period. During the study period, due to the deep soil desiccation, P. orientalis, P. davidiana and M. sativa mainly utilized water from shallow (0–80 cm) soil layers, with a contribution rate of 65.4 ± 8.3%, 64.9 ± 7.7% and 73.0 ± 0.2%, respectively. The three coexisting plants relied on the unstable shallow soil water (recharged by rainfall) while the water use proportion of the deep soil layer was consistently low. This implies that the three plants were less resistant to drought stress, thus posing a threat to the stability and sustainability of the agroforestry system. Moreover, even in July and September with the high SWC in agroforestry, the partitioning of soil water among the three coexisting plants did not increase with increased ET loss. The three coexisting plants showed strong competition for soil water use, as indicated by the high values (0.69–0.97) of PS. Overall, the hydrological niche overlap of the coexisting plants in the agroforestry system resulted in low ecosystem stability. Density reduction or selection of suitable species is required to achieve sustainable vegetation restoration. © 2023
KeywordEcology Isotopes Landforms Restoration Sediments Soil moisture Sustainable development Vegetation Water supply Agroforestry Agroforestry system Coexisting plant Loess Plateau Plant water Plant water uptake Semi arid Semi-arid loess plateau Stable isotopes Water uptake
PublisherElsevier B.V.
DOI10.1016/j.agwat.2023.108206
Indexed ByEI
Language英语
EI Accession Number20231113709629
EI KeywordsRain
EI Classification Number443.3 Precipitation ; 446.1 Water Supply Systems ; 454.3 Ecology and Ecosystems ; 481.1 Geology ; 483 Soil Mechanics and Foundations ; 483.1 Soils and Soil Mechanics
Original Document TypeJournal article (JA)
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/500416
Collection草地农业科技学院
Corresponding AuthorShen, Yuying
Affiliation
1.State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Lanzhou University, Lanzhou; 730020, China;
2.College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou; 730020, China;
3.Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, Lanzhou University, Lanzhou; 730020, China;
4.Chankou Forestry Experiment Field of Dingxi City, Dingxi; 743000, China
First Author AffilicationLanzhou University;  College of Pastoral Agriculture Science and Technology
Corresponding Author AffilicationLanzhou University;  College of Pastoral Agriculture Science and Technology
Recommended Citation
GB/T 7714
Chen, Zhixue,Wang, Guohui,Yang, Xianlong,et al. Water competition among the coexisting Platycladus orientalis, Prunus davidiana and Medicago sativa in a semi-arid agroforestry system[J]. AGRICULTURAL WATER MANAGEMENT,2023,279.
APA Chen, Zhixue,Wang, Guohui,Yang, Xianlong,Li, Zhenfeng,&Shen, Yuying.(2023).Water competition among the coexisting Platycladus orientalis, Prunus davidiana and Medicago sativa in a semi-arid agroforestry system.AGRICULTURAL WATER MANAGEMENT,279.
MLA Chen, Zhixue,et al."Water competition among the coexisting Platycladus orientalis, Prunus davidiana and Medicago sativa in a semi-arid agroforestry system".AGRICULTURAL WATER MANAGEMENT 279(2023).
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