Agricultural Water Management, Journal Year: 2023, Volume and Issue: 279, P. 108206 - 108206

Published: Feb. 2, 2023

Agroforestry has been widely used for the ecological restoration construction of semi-arid regions Chinese Loess Plateau. Investigating plant water sources is crucial understanding key ecohydrological processes root uptake and relations between coexisting plants. Clarifying use strategies can help to assess sustainability vegetation in agroforestry systems provide references management. Thus, we investigated characteristics plants an system consisting Platycladus orientalis, Prunus davidiana Medicago sativa. The δD δ18O stem soil 0–300 cm layer were measured. MixSIAR model proportional similarity (PS) quantify proportion absorbed by each hydrological niche overlap results showed that combined effects rainfall recharge evapotranspiration (ET) loss resulted a decrease content (SWC) with increasing depth, SWC deep (80–300 cm) had minor variability (6.1–7.1%) throughout study period. During period, due desiccation, P. M. sativa mainly utilized from shallow (0–80 layers, contribution rate 65.4 ± 8.3%, 64.9 7.7% 73.0 0.2%, respectively. three relied on unstable (recharged rainfall) while was consistently low. This implies less resistant drought stress, thus posing threat stability system. Moreover, even July September high agroforestry, partitioning among did not increase increased ET loss. strong competition use, as indicated values (0.69–0.97) PS. Overall, low ecosystem stability. Density reduction or selection suitable species required achieve sustainable restoration.

Language: Английский