Description
Plant water use efficiency reflects the survival adaptation strategies adopted by plants to obtain maximum carbon harvest. Understanding the water and resource utilization strategies of Stipa breviflora in desert steppe will help people understand its growth mechanism, and it is of great significance to analyze the ecological countermeasures of Stipa breviflora to cope with disturbance. In this study, the water use efficiency (WUE) of the established populations of Stipa breviflora in desert steppe was measured by stable carbon isotope method and photosynthometer method, and the adaptation mechanism of Stipa breviflora under different stocking rates was discussed based on the basic quantitative characteristics, leaf nutrient content, and soil physical and chemical properties. The results showed as follows: WUEl of MG treatment was significantly lower than that of CK and HG treatment (P < 0.05), and there was no significant difference between WUEl of LG treatment and other treatment (P > 0.05). With the increase of stocking rate, WUEl of S. breviflora showed a trend of first decreasing and then increasing. S. breviflora WUEt in CK and LG treatments was significantly higher than that in HG treatment, but there was no significant difference between S. breviflora WUEt in MG treatment and other treatments. With the increase of stocking rate, S. breviflora WUEt showed a linear decreasing trend. The WUEi of S. breviflora in LG treatment area was significantly higher than that in HG treatment area, but there was no significant difference in WUEi among other treatment areas. In general, with the increase of stocking rate, the WUE of Stipa breviflora showed a downward trend. By exploring the effects of different stocking rates on WUE of the established species in Stipa breviflora desert steppe, we concluded that increasing stocking rates reduced WUE of Stipa breviflora, and banning grazing was an ideal way to improve WUE of the established species.
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Effects of Stocking Rates on Water Use Efficiency of Established Species in Stipa breviflora Desert Steppe
Plant water use efficiency reflects the survival adaptation strategies adopted by plants to obtain maximum carbon harvest. Understanding the water and resource utilization strategies of Stipa breviflora in desert steppe will help people understand its growth mechanism, and it is of great significance to analyze the ecological countermeasures of Stipa breviflora to cope with disturbance. In this study, the water use efficiency (WUE) of the established populations of Stipa breviflora in desert steppe was measured by stable carbon isotope method and photosynthometer method, and the adaptation mechanism of Stipa breviflora under different stocking rates was discussed based on the basic quantitative characteristics, leaf nutrient content, and soil physical and chemical properties. The results showed as follows: WUEl of MG treatment was significantly lower than that of CK and HG treatment (P < 0.05), and there was no significant difference between WUEl of LG treatment and other treatment (P > 0.05). With the increase of stocking rate, WUEl of S. breviflora showed a trend of first decreasing and then increasing. S. breviflora WUEt in CK and LG treatments was significantly higher than that in HG treatment, but there was no significant difference between S. breviflora WUEt in MG treatment and other treatments. With the increase of stocking rate, S. breviflora WUEt showed a linear decreasing trend. The WUEi of S. breviflora in LG treatment area was significantly higher than that in HG treatment area, but there was no significant difference in WUEi among other treatment areas. In general, with the increase of stocking rate, the WUE of Stipa breviflora showed a downward trend. By exploring the effects of different stocking rates on WUE of the established species in Stipa breviflora desert steppe, we concluded that increasing stocking rates reduced WUE of Stipa breviflora, and banning grazing was an ideal way to improve WUE of the established species.
