RESUMO
Acer catalpifolium is a unique species and wild endangered one in China. Currently, no research has addressed its endangered status from the perspective of photosynthetic characters. The photosynthesis characteristics and growth rate of A. catalpifolium seedlings from four provenances (Dujiangyan, Dayi, Emeishan and Leibo) under two shading conditions (50% and 80% of full shade) were examined to explore the light response mechanism. The results showed that the net photosynthetic rate (Pn), stomatal conductance (gs), transpiration rate (Tr) and water use efficiency (WUE) of A. catalpifolium seedlings from four provenances sharply decreased with the decreases of light intensity. When the light intensity was reduced, the light compensation point (LCP) and light saturation point (LSP) of A. catalpifolium seedlings from Dujiangyan and Emei-shan were all decreased, while those of the seedlings from Dayi increased, and those of the seedlings from Leibo showed no significant changes. Net photosynthetic rate and water use efficiency were positively correlated with plant height and crown growth. The effects of different light intensities on photosynthetic characteristics and growth rate of A. catalpifolium were significantly different. Low light availability under canopy might be the limiting factor for natural regeneration of A. catalpifolium populations from Dayi. Compared with other provenances, A. catalpifolium seedlings from Leibo were more shade requiring. A. catalpifolium had better light adaptability and growth performance from Dujiangyan and Emeishan, which could be used as high-quality source for transplant protection.
Assuntos
Acer/fisiologia , Fotossíntese , China , Luz , Folhas de Planta , PlântulaRESUMO
OBJECTIVE: To evaluate the clinical results of locking proximal femur plate(LPFP), proximal femoral nail antirotation(PFNA) and bipolar hemiarthroplasty(BPH) in the treatment of femoral intertrochanteric fractures in elderly patients. METHODS: Retrospective analysis of the 86 elderly patients with femoral intertrochanteric fractures during June 2011 and August 2016 were enrolled in this study. The patients were divided into 3 groups: 26 cases in LPFP group included 10 males and 16 females with an average age of (72.54±4.78) years old, 5 cases of type II of Evans, 12 cases of type III and 9 cases of type IV; 39 cases in PFNA group included 17 males and 22 females with an average age of 74.41±5.65, 11 cases of type II, 18 cases of type III and 10 cases of type IV; 21 cases in BPH group included 9 males and 12 females with an average age of 76.23±6.97, 1 case of type II, 10 cases of type III and 10 cases of type IV. The data of three groups were collected for statistical analysis on the following aspects: operation time, intraoperative blood loss, the length of hospital stay, postoperative complications and Harris score of the hip joint function. RESULTS: The wound healed well and no complication occurred. Eighty-four cases were follow-up, while 2 cases were lost, the follow-up rate was 97.6%. The patients were followed up for 22 to 41 months with an average of 26.3 months. For comparison of operation time and time of the hospital stay, BPH group was shorter than the LPFP and PFNA group(F=19.782, 21.981, P<0.05). For comparison of the intraoperative blood loss, the BPH group was less blood loss than the LPFP and PFNA group(F=12.976, P<0.05), while there was no significant means between the LPFP and PFNA group(t=10.879, P>0.05). For comparison of the postoperative complications, LPFP group was higher than BHP and PFNA group(F=30.976, P<0.05), while there was no significant means between LPFP and PFNA group(t=9.902, P>0.05). For comparison of the Harris score of the hip joint at 1 year after operation, BPH and PFNA group were both higher than LPFP group(F=19.692, P<0.05), while there was no significant means between BPH and PFNA group (t=4.971, P>0.05). CONCLUSIONS: For elder patient with femoral intertrochanteric fracture, BPH could be the best optional for the shorter operation time and less complications. And the PFNA also could be optional choice for the patients while the LPFP was forbidden for the elder patients.
