Table 2.— Status of shelterwood trees after harvest 



Unit and subtreatment 



Description 11-1 11-2 11-3 11-4 21-1 21-2 21-3 21-4 



■Trees per acre- 



Preharvest marked leave 



trees/acre 



66 



51 



73 



51 



98 



78 



65 



89 



(No./ha) 



(163) 



(126) 



(180) 



(126) 



(242) 



(193) 



(161) 



(220) 



Postharvest 



















Leave trees missing 



















or killed (Group I) 



12.7 



12.5 



17.4 



10.5 



22.5 



20.3 



10.2 



30.7 



(No./ha) 



(31) 



(31) 



(43) 



(26) 



(56) 



(50) 



(25) 



(76) 



Damage on remaining 



















trees 



















Group II 



5.4 



2.1 



5.1 



3.4 



12.2 



9.2 



8.2 



5.2 



Group III 



3.1 



.5 



2.0 



.8 



5.1 



0.4 



2.6 



.6 



Groups IV-V 



30.5 



16.5 



28.1 



25.8 



37.0 



28.3 



32.5 



40.7 



None 



18.2 



19.4 



20.4 



20.6 



21.2 



19.2 



1 1.5 



21.7 



Total trees 



















remaining' 



57.2 



38.5 



55.6 



50.6 



75.5 



57.7 



54.8 



68.3 



(No./ha) " 



(141) 



(95) 



(137) 



(125) 



(186) 



(142) 



(135) 



(169) 



1 1n units 1 1-1 and 21-1 the marked leave trees minus the killed or missing leave trees do not equal the 

 total trees remaining because in some cases unmarked smaller trees were left as replacement for leave 

 trees killed in logging or as additional leave trees. 



Damage and Stand Conditions 



We hypothesized that stand conditions might 

 affect logging damage, and to test this we devised 

 a scheme for making simple rank correlation tests. 

 Each of the eight subtreatment units was rated 

 from "1" (most favorable) to "8" (least favorable). 

 We used four measured stand conditions as 

 follows: 



Stand Conditions 



Cut volume per acre: (lowest volume = 1, 

 highest volume = 8) 



Total number of trees per acre 7 inches + 

 d.b.h.: (fewest = 1, most = 8) 



Number of marked leave trees per acre: (few- 

 est = 1 , most = 8) 



Expected damage, based on treatment and 

 number of stems removed per acre: (1 = 

 best combination, 8 = difficult combination) 



As an example, we expected treatment 3 to have 

 highest damage because small trees were bun- 

 dled and yarded in addition to the cut trees marked 

 for cutting. Unit 21-3 had the most small trees and 

 ranked "8" on the expected damage, and unit 1 1 -3 

 was ranked 7. Treatment 4 called for protecting 

 the understory, and was ranked "1" for unit 1 1-4 

 and "2" for unit 21-4, based on number of stems. 



The ranking for each of these stand conditions 

 was then compared to the subtreatment rankings 

 on actual damage observed, using the following 

 measures: 



5 



