Chin J Plant Ecol ›› 2023, Vol. 47 ›› Issue (1): 101-113.

• Research Articles •

### Effects of different clipping degrees on non-structural carbohydrate metabolism and biomass of Cyperus esculentus

LI Bian-Bian, ZHANG Feng-Hua*(), ZHAO Ya-Guang, SUN Bing-Nan

1. Xinjiang Production and Construction Group Key Laboratory of Oasis Eco-agriculture, College of Agriculture, Shihezi University, Shihezi, Xinjiang 832003, China
• Received:2021-12-20 Accepted:2022-05-19 Online:2023-01-20 Published:2022-07-15
• Contact: *ZHANG Feng-Hua(fenghuazhang2021@163.com)
• Supported by:
Local Special Projects Guided by the Central Government(2060404);Major Planned Projects of the Xinjiang Production and Construction Corps(RCZK201928)

Abstract:

Aims The aims of this study were to investigate the effects of different stubble height on non-structural carbohydrate metabolism of Cyperus esculentus, to further clarify the relationship between stubble height and aboveground biomass of C. esculentus, and to seek the best clipping height.
Methods The growth physiology parameters, non-structural carbohydrates and aboveground biomass of C. esculentus leaves at six stubble heights (10, 20, 30, 40, 50 cm and uncut) were determined.
Important findings The results showed that clipping can stimulate the photosynthesis of C. esculentus. The peak of regeneration and growth was reached from 1 to 14 days after clipping. The contents of soluble sugars in leaves of 30 cm stubbles (7th, 21st and 28th days) were higher than those in leaves of other treatments, which were 9.22%, 10.83% and 9.07%, respectively, and the starch contents (14th and 21st days) were 4.88% and 4.11%, respectively. The sucrose contents in leaves of 40 cm stubbles (21st and 28th days) were higher than those in leaves of other treatments, which were 7.88% and 11.38%, respectively. The fructose contents (14th and 21st days) were also higher than those in leaves of other treatments, which were 5.29% and 6.40%, respectively. The activities of sucrose phosphate synthase and sucrose synthase in 30 cm stubbles and 40 cm stubbles were higher than those in other treatments in different periods after clipping. Stubble 10 cm inhibited the increase of sucrose content and related enzyme activities of C. esculentus. The total amount of forage at clipping and harvest, the hay mass of 30 cm stubbles was up to 10 605.11 kg·hm-2, 19.93% higher than that of uncut. The hay mass of 40 cm stubbles was up to 8 976.93 kg·hm-2, 1.52% higher than that of uncut. In addition, through redundancy analysis, soluble sugar content, the activities of sucrose synthase and sucrose phosphate synthase were important factors affecting the forage yield and regeneration rate. In the long period of cutting (day 7-28), 30-40 cm stubbles were more conducive to regeneration and growth, accumulation and synthesis of non-structural carbohydrate, as well as related enzyme activities and forage yield. Therefore, the suitable stubble height range was 30-40 cm.