The accuracy of three methods (pellet group count, inverse line transect method and track count) for estimat-ing the density of ungulate population was assessed, based on a wapiti population with the known size in the...The accuracy of three methods (pellet group count, inverse line transect method and track count) for estimat-ing the density of ungulate population was assessed, based on a wapiti population with the known size in the enclosure of500 hm2 on Tonghe Hunting Farm, Heilongjiang province, China, during 1992-1993. The estimation of population densityusing the Pelld group count method was the closeSt to the actual value, whereas the density of the wapiti population wasunderestimated by the inverse line transect method and overestimated by the track count method. No signilicant differenceexisted the estimated and actual values for the pellet group method and the inverse line transed method, but thesignificant differen was found for the track count method. Therefore, it is suggested that the pellet group method should begiven the priority in the survey of ungulate population abundance in practice.展开更多
One of the basic parameters in forest management planning is detailed knowledge of growing stock,information collected by forest inventory.Sampling methods must be accurate,inexpensive,and be easy to implement in the ...One of the basic parameters in forest management planning is detailed knowledge of growing stock,information collected by forest inventory.Sampling methods must be accurate,inexpensive,and be easy to implement in the field.This study presents a new sampling method called branching transect for use in the Iranian Zagros forests and similar forests.Features of the new method include greater accuracy,easy implementation in nature,simplicity of statistical calculations,and low cost.In this method,transect is used,which includes some subtransects(side branches).The length of the main transect,side branches,number of trees measured in each side branch,and the number of sub-branches in this method are changeable based on homogeneity,heterogeneity,and density of a forest.In this study,based on the density and heterogeneity of the forest area studied,20-m transects with four and eight side branches were used.Sampling plots(Transects)in four inventory networks(100 m×100 m,100 m×150 m,150 m×150 m and 100 m×200 m)were implemented in the GIS environment.The results of this sampling method were compared to the results of total inventory(100%count)in terms of accuracy,precision(t-test),and inventory error percentage.Branching transect results were statistially similar to total inventory counts in all cases.The results show that this method of estimating density and canopy per hectare can be used in Zagros forests and similar forests.展开更多
目的探讨美蓝染色标记法联合Glisson蒂横断式肝切除与非规则性肝切除治疗肝癌的临床疗效。方法对美蓝染色标记法联合Glisson蒂横断式肝切除25例(联合组)与非规则性肝切除23例(非规则组)治疗肝癌作前瞻性研究,比较两组患者围手术期情况,...目的探讨美蓝染色标记法联合Glisson蒂横断式肝切除与非规则性肝切除治疗肝癌的临床疗效。方法对美蓝染色标记法联合Glisson蒂横断式肝切除25例(联合组)与非规则性肝切除23例(非规则组)治疗肝癌作前瞻性研究,比较两组患者围手术期情况,包括平均手术时间、术中出血量、术后1 d和4 d AST的水平、肿瘤标本切缘阳性率、并发症发生率、术后1年复发率和1年生存率等,并分析其临床疗效。结果两组患者均无围手术期死亡病例。联合组平均手术时间较非规则组少[(120.16±15.45)min vs(130.26±8.48)min,t=2.77,P<0.05];联合组术中出血量较非规则组少[(252.40±81.25)ml vs(493.44±100.96)ml,t=8.42,P<0.05];联合组术后1 d、4 d AST水平上升幅度较非规则组小[(1 d AST:(143.76±49.48)U/L vs(253.82±77.79)U/L,t=5.90,P<0.05;4 d AST:(79.36±24.51)U/L vs(129.57±45.66)U/L,t=4.80,P<0.05];肿瘤标本切缘阳性率分别为4.0%和8.7%(P>0.05);围手术期并发症发生率联合组较非规则组低(12.00%vs 39.13%,P<0.05);术后1年复发率联合组较非规则组低(20.00%vs 47.83%,P<0.05);术后1年生存率两组差异无统计学意义(80.00%vs78.26%,P>0.05)。结论美蓝染色标记法联合Glisson蒂横断式肝切除较非规则性肝切除治疗肝癌的术中出血量和术后并发症少,患者术后恢复快,复发率低,值得临床推广应用。展开更多
文摘The accuracy of three methods (pellet group count, inverse line transect method and track count) for estimat-ing the density of ungulate population was assessed, based on a wapiti population with the known size in the enclosure of500 hm2 on Tonghe Hunting Farm, Heilongjiang province, China, during 1992-1993. The estimation of population densityusing the Pelld group count method was the closeSt to the actual value, whereas the density of the wapiti population wasunderestimated by the inverse line transect method and overestimated by the track count method. No signilicant differenceexisted the estimated and actual values for the pellet group method and the inverse line transed method, but thesignificant differen was found for the track count method. Therefore, it is suggested that the pellet group method should begiven the priority in the survey of ungulate population abundance in practice.
文摘One of the basic parameters in forest management planning is detailed knowledge of growing stock,information collected by forest inventory.Sampling methods must be accurate,inexpensive,and be easy to implement in the field.This study presents a new sampling method called branching transect for use in the Iranian Zagros forests and similar forests.Features of the new method include greater accuracy,easy implementation in nature,simplicity of statistical calculations,and low cost.In this method,transect is used,which includes some subtransects(side branches).The length of the main transect,side branches,number of trees measured in each side branch,and the number of sub-branches in this method are changeable based on homogeneity,heterogeneity,and density of a forest.In this study,based on the density and heterogeneity of the forest area studied,20-m transects with four and eight side branches were used.Sampling plots(Transects)in four inventory networks(100 m×100 m,100 m×150 m,150 m×150 m and 100 m×200 m)were implemented in the GIS environment.The results of this sampling method were compared to the results of total inventory(100%count)in terms of accuracy,precision(t-test),and inventory error percentage.Branching transect results were statistially similar to total inventory counts in all cases.The results show that this method of estimating density and canopy per hectare can be used in Zagros forests and similar forests.
文摘目的探讨美蓝染色标记法联合Glisson蒂横断式肝切除与非规则性肝切除治疗肝癌的临床疗效。方法对美蓝染色标记法联合Glisson蒂横断式肝切除25例(联合组)与非规则性肝切除23例(非规则组)治疗肝癌作前瞻性研究,比较两组患者围手术期情况,包括平均手术时间、术中出血量、术后1 d和4 d AST的水平、肿瘤标本切缘阳性率、并发症发生率、术后1年复发率和1年生存率等,并分析其临床疗效。结果两组患者均无围手术期死亡病例。联合组平均手术时间较非规则组少[(120.16±15.45)min vs(130.26±8.48)min,t=2.77,P<0.05];联合组术中出血量较非规则组少[(252.40±81.25)ml vs(493.44±100.96)ml,t=8.42,P<0.05];联合组术后1 d、4 d AST水平上升幅度较非规则组小[(1 d AST:(143.76±49.48)U/L vs(253.82±77.79)U/L,t=5.90,P<0.05;4 d AST:(79.36±24.51)U/L vs(129.57±45.66)U/L,t=4.80,P<0.05];肿瘤标本切缘阳性率分别为4.0%和8.7%(P>0.05);围手术期并发症发生率联合组较非规则组低(12.00%vs 39.13%,P<0.05);术后1年复发率联合组较非规则组低(20.00%vs 47.83%,P<0.05);术后1年生存率两组差异无统计学意义(80.00%vs78.26%,P>0.05)。结论美蓝染色标记法联合Glisson蒂横断式肝切除较非规则性肝切除治疗肝癌的术中出血量和术后并发症少,患者术后恢复快,复发率低,值得临床推广应用。
