Effects of Cover Crops on Water Use Efficiency in Orchard Systems in the Danjiangkou Catchment, Central China
Water scarcity limits orchard productivity. A two‑year field study shows how legume, gramineae, and mixed cover crops affect soil moisture, evapotranspiration, and WUE. Mixed covers best reduced drought impacts, boosted transpiration, and improved WUE, offering a promising strategy for water‑limited orchards.
Subject Tags
- Agriculture
Abstract
Water scarcity strongly limits the establishment and productivity of young orchards. Although cover crops are increasingly adopted to improve soil health, their integrated effects on soil–plant–water interactions under drought remain unclear. Here, a two-year field study evaluated Legume, Gramineae, and Legume-Gramineae mixture covers in relation to soil water dynamics, evapotranspiration (ET), and water use efficiency (WUE). Gramineae cover reduced 0–100 cm soil water storage by 5.99% compared with bare soil, whereas the Legume-Gramineae mixture effectively buffered drought-induced water loss. All cover treatments increased total ET, with the mixture showing the highest (10.31%), indicating that enhanced transpiration compensated for reduced soil evaporation. As a result, WUE improved, particularly during winter and spring when water demand was lower. Stepwise analysis identified rainfall as the primary climatic drivers of ET and WUE. Overall, the Legume-Gramineae mixture offers a promising strategy for improving WUE and mitigating drought stress in water-limited orchards.
Citation
Li, L., Chen, P., Jing, X., Lyu, C., Zhang, R., Yuan, X., ... & Li, Z. (2025). Effects of Cover Crops on Water Use Efficiency in Orchard Systems in the Danjiangkou Catchment, Central China. Plants, 14(24), 3729.
TNC Authors
-
Qian Li
Yellow River Wetland Project Director, China
The Nature Conservancy
Email: qian.li@tnc.org -
Xiaoquan Zhang
China Country Director
The Nature Conservancy
Email: zxiaoquan@tnc.org -
Xiaoliang Yuan
The Nature Conservancy