PJB-2020-337
Comparative study on photosynthetic characteristic and soil moisture thresholds of turfgrasses
Haimei Li
Abstract
Lawn is an important component of green open spaces in cities, and it is also characterized with high water consumption. Under the increasing water shortage circumstance, it is crucial to reveal the water consumption laws of lawn, especially optimal soil moisture thresholds of lawn growth. Four turfgrasses, including Festuca elata Keng ex E. Alexeev, Poa pratensis L., Cynodon dactylon (L.) Pers., Buchloe dactyloides (Nutt.) Engelm, were selected to determine the light response process of photosynthetic physiological parameters under different soil water content conditions. Then, the connections between soil relative water content (RWC) and photosynthetic physiological parameters of turfgrasses were analyzed to obtain the optimal soil moisture thresholds of the four turfgrasses. The results show that the net photosynthetic rate (PN) and water use efficiency (WUE) of warm-season turfgrasses (C. dactylon, B. dactyloides) were higher than that of the cool-season turfgrasses (F. elata, P. pratensis), the curve-fitting equations of RWC and dark respiration rate (Rd) for F. elata, RWC and maximum net photosynthetic rate (PNmax) for C. dactylon were y=–0.217+0.010x (P<0.05), y=2.149+0.112x (P<0.05), respectively. The optimal soil moisture thresholds of four turfgrasses were as follows: F. elata was 52.2%–66.8%, P. pratensis was 75.3%–88.0%, C. dactylon was 73.1%–83.0%, B. dactyloides was 53.3%–81.0%. This study would provide the scientific basis for selection of water-saving turfgrass and prescribed lawn irrigation.
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