(This was sent as a letter so text comments may seem a little weird in this html format. Also I see that the figures need some jazzing up in order to be enjoyably readable. I will fix that some day.)
............ This is an experiment - I will call it our first "Intersite Dear Assoc." communication. For the PR folk's background, I (TGS) have been sending around to other Hubbard Brookers information about analytical results that fall out of work in my lab. These results/comments/editorials etc. are sent around to the internal "circle" of Hubbard Brook researchers on a "for your information basis". Since I am now on the very peripheral edges of work in PR with the Vogts and I am well entrenched with the Hubbard Brook LTER data, I thought it might be of interest to try this approach on an intersite basis. We are always getting grief for not working with other LTER sites(we meaning Hubbard Brook, this seemed a natural).
........... This communication gives the results of that survey. The data for this are attached to this communication and are on the Hubbard Brook WWW (www.yale.edu/edex) such that if you wish you can transfer them to your WWW system and we can drop them (experimental hi-tech info. transfer).
............ I have attached some graphical summaries of the results to date. Bisley (3 and 5) beat out Hubbard Brook on an 8 months basis, but fell sorely behind on a "length of Hubbard Brook growing season basis- which is two months". Extrapolating out to a year it looks like El Verde may grow in 12 months what Hubbard Brook does in two months. Bisley on the other hand on a 12 month basis out grows Hubbard Brook about 3 to one. (Band dendrometers run at Hubbard Brook at several intervals over the past 30 years indicate that diameter growth starts about the first of June and ends at the end of July).
............ Of course 8 months is hardly enough time to make all these calls, but the idea is one of communication and we will be back to you as we continue to follow this over the next several years.
............ Fred sent me the stuff Pete Weaver did on this sort of thing and his trees (several hundreds based on remeasurements after 5 or 15 or so years). Pete's average radial growth was also on the order of 2 - 3 mm per year. So the trees we measured so far are not all that far off the official dogma.
............ This communication is supposed to be informational and not the end-all. Anyone with other growth data or insights as to the hows and whys of this or who is interested in it should feel free to contact us. (Vogt or Siccama at Yale)
Jen O'Hara, K & D Vogt, F. Scatena, F. Wadsworth, P. Weaver, J. Lodge, A. Lugo, A. Johnson G. Likens, T. Fahey, C. Driscoll, C. Johnson, C. Eager, S. Brown, W. Silver, Doug Schaefer, Xiaoming Zom, Allan Covich, Bob Waide, Lars Walker, Jeff Zimmerman. ( This is one of those things that if I just stick it on the web in color it would save mailing- which I have done and you might want to look.)
Tom Siccama - fes575a@yalevm.cis.yale.edu
Notes:
Fig 1. The three panels of Fig. 1 illustrate the average radial growth rates of the PR and Hubbard Brook trees .
Fig. 2 The two panels of Fig 2. illustrate the data points for the Hubbard Brook trees and for the P.R. trees derated to a two month basis for comparison. The balsa tree which grew 8 cm in added circumference was not included I these data. The royal palm, which is not supposed to be growing, measured a 0.1 cm increase in circumference which is probably a measure of the noise in making the readings on the bands. Actually dropping all the trees which had 0.1 cm of circumference growth would probably be a more reasonable estimate of growth.
Table. 1. Table 1 gives some numeric summaries of the P.R. data. The 1,2 3 under the "study area" column are the three Vogt plots in each of the sites. The # of trees is obvious. The mm of growth is radial growth. The basal area increment is the amount of basal area added by the accrued growth expressed as a percent of the original basal area. The mm/2 months is the 8 month growth total derated to a 2 month growing season basis for comparison to Hubbard Brook.
Study # of mm of Basal mm/2
area Plot trees radial area months
growth inct. %
---------------------------------------------------------------
Bisley 5 1 12 2.3 5.96 0.61
2 18 1.1 1.46 0.25
3 18 1.4 2.50 0.34
-----------------------------------
Ave. or total 48 1.6 3.3 0.40
Bisley 3 1 18 2.3 7.23 0.62
2 18 1.8 3.90 0.39
3 17 1.2 2.98 0.29
-----------------------------------
Ave. or total 53 1.8 4.7 0.43
Le Verde 1 18 0.5 0.87 0.13
2 19 0.6 1.10 0.16
3 18 0.7 1.13 0.18
-----------------------------------
Ave. or total 53 0.6 1.00 0.16
Table 2. Table 2 is the raw data for each of the plots. The first # is the tree tag #. The 4 letter code is the species code. (I would like to replace these with the official codes used by the P.R. research group - if someone will give them to me.). The third number is the diameter of the tree at the band ( which is more or less at dbh). The next number is the cm of dendrometer band expansion(circumference). The last number is the mm of radial growth. Our species are:
Cecropia peltata CEPE Sapium SASP Unknown XXXX (We have no clue! Help!) Dacryodes excelsa DAEX Manilkara bidentata MABI Inga fagifolia DISP Casearia sp. CASP Syzygium jambos SYJA Ochroma pyramidale OCPY Roystonea borinquena ROBO Sloanea sp. SLSP Buchenavia capitata BUCA
Table 2.
Puerto Rico Band Dendrometers, dendro.dat, established 5/12/95, read 1/9/96
Data are:
Tree #
Species code (see attached list)
dbh(cm)
cm of circumference growth May 95 to Jan 96
mm of radial growth in 8 months
Bisley 5 Plot 1
452 CEPE, 22.3 3.0 4.77
445 CEPE, 13.0 3.4 5.41
444 SASP, 9.0 0.4 0.64
441 CEPE, 18.7 2.7 4.30
431 XXXX, 36.6 0.0 0.00
380 XXXX, 45.0 0.3 0.48
379 CEPE, 24.5 1.8 2.86
296 CEPE, 21.4 3.0 4.77
361 XXXX, 52.5 0.0 0.00
352 CEPE, 12.2 2.4 3.82
310 SASP, 14.1 0.1 0.16
316 CASP, 16.2 1.4 2.23
0
Bisley 5 plot 2
244 DAEX, 76.0 1.0 1.59
249 DAEX, 19.0 0.1 0.16
266 XXXX, 28.1 0.2 0.32
106 XXXX, 24.0 2.3 3.66
99 DAEX, 48.5 0.4 0.64
5 DAEX, 71.0 0.8 1.27
20 DAEX, 45.7 0.2 0.32
28 XXXX, 28.0 1.4 2.23
23 DAEX, 66.0 0.3 0.48
78 XXXX, 11.9 0.6 0.95
115 XXXX, 15.4 0.1 0.16
125 DAEX, 72.0 1.1 1.75
146 XXXX, 27.4 0.5 0.80
135 XXXX, 21.4 1.0 1.59
236 XXXX, 35.4 0.1 0.16
211 XXXX, 36.7 0.5 0.80
205 CEPE, 11.5 0.1 0.16
201 CEPE, 17.2 0.8 1.27
0
Bisley 5 Plot 3
652 CEPE, 17.5 1.2 1.91
651 XXXX, 24.6 0.6 0.95
677 XXXX, 38.5 1.7 2.71
670 CEPE, 18.5 1.2 1.91
683 CEPE, 18.8 0.7 1.11
691 XXXX, 26.5 1.4 2.23
504 DAEX, 32.3 0.1 0.16
502 DAEX, 54.4 0.7 1.11
496 XXXX, 36.5 0.8 1.27
493 CEPE, 18.0 1.8 2.86
474 CEPE, 17.2 0.6 0.95
539 XXXX, 35.6 0.4 0.64
592 DAEX, 41.9 0.0 0.00
616 XXXX, 27.3 0.3 0.48
602 XXXX, 13.2 1.4 2.23
619 CEPE, 31.4 0.8 1.27
549 XXXX, 22.5 0.8 1.27
581 CASP, 15.4 0.7 1.11
0
Bisley 3 Plot 1
830 XXXX, 10.6 0.5 0.80
840 XXXX, 11.6 1.0 1.59
853 XXXX, 14.5 2.0 3.18
865 XXXX, 10.6 0.3 0.48
699 DISP, 16.1 5.4 8.59
738 CASP, 11.7 1.0 1.59
745 DAEX, 9.5 0.7 1.11
781 XXXX, 24.6 0.6 0.95
780 CASP, 17.1 0.1 0.16
779 XXXX, 12.8 3.4 5.41
753 XXXX, 16.0 1.1 1.75
747 XXXX, 20.9 2.7 4.30
739 XXXX, 13.5 3.6 5.73
741 CEPE, 14.1 1.7 2.71
713 CASP, 21.8 0.2 0.32
716 CASP, 17.4 0.2 0.32
711 CEPE, 12.6 0.8 1.27
694 XXXX, 12.5 2.8 4.46
0
Bisley 3 Plot 2
992 XXXX, 17.8 1.4 2.23
983 CEPE, 10.9 1.9 3.02
974 CEPE, 10.4 2.1 3.34
962 XXXX, 16.6 0.5 0.80
966 XXXX, 11.1 1.0 1.59
939 XXXX, 16.2 0.1 0.16
908 XXXX, 11.3 0.5 0.80
948 XXXX, 16.3 0.0 0.00
952 CASP, 28.6 0.5 0.80
912 DAEX, 47.0 1.5 2.39
913 DAEX, 27.1 1.4 2.23
924 DAEX, 41.9 1.3 2.07
923 XXXX, 8.4 0.5 0.80
884 XXXX, 13.8 0.3 0.48
888 XXXX, 42.2 1.0 1.59
871 XXXX, 21.6 1.0 1.59
889 XXXX, 14.0 2.0 3.18
898 CASP, 15.7 0.5 0.80
0
Bisley 3 Plot 3
1137 XXXX, 14.0 2.7 4.30
1138 OCPY, 19.4 8.1 12.89
1126 XXXX, 10.9 1.5 2.39
1125 XXXX, 11.8 0.8 1.27
1110 CEPE, 9.7 0.1 0.16
1065 XXXX, 12.2 0.2 0.32
1081 XXXX, 12.1 0.7 1.11
9999 INFA, 20.3 1.0 1.59
1063 XXXX, 15.3 0.1 0.16
1064 XXXX, 23.7 0.1 0.16
1070 MABI, 13.4 0.2 0.32
1067 MABI, 14.0 0.1 0.16
1061 MABI, 59.9 0.5 0.80
1055 DAEX, 25.6 2.2 3.50
1051 MABI, 23.8 0.2 0.32
1015 DAEX, 31.5 1.0 1.59
1032 SYJA, 13.6 1.0 1.59
1040 XXXX, 9.7 0.1 0.16
0
El Verde Plot 1
1576 DAEX, 25.3 0.1 0.16
1571 DAEX, 17.7 0.8 1.27
1550 MABI, 51.7 0.1 0.16
1552 INFA, 18.1 0.1 0.16
1560 MABI, 22.1 0.1 0.16
1554 INFA, 32.6 0.1 0.16
1328 DAEX, 21.8 0.3 0.48
1385 XXXX, 12.9 0.0 0.00
1389 DAEX, 23.6 0.3 0.48
1396 DAEX, 37.1 0.5 0.80
1392 DAEX, 28.7 0.5 0.80
1398 CASP, 14.0 0.1 0.16
1505 DAEX, 23.4 0.5 0.80
1506 DAEX, 31.3 0.1 0.16
1503 CASP, 13.1 0.4 0.64
1547 DAEX, 25.0 0.3 0.48
1537 DAEX, 40.1 0.8 1.27
1535 DAEX, 28.6 0.8 1.27
0
El Verde Plot 2
1372 MABI, 12.5 0.2 0.32
1358 MABI, 11.0 0.2 0.32
1361 MABI, 42.8 0.0 0.00
1349 MABI, 25.4 0.7 1.11
1343 MABI, 19.9 0.5 0.80
1380 DAEX, 18.4 1.0 1.59
1313 DAEX, 19.5 0.0 0.00
1318 XXXX, 29.7 0.2 0.32
1325 XXXX, 16.4 0.0 0.00
1334 SLSP, 16.3 0.6 0.95
1186 INFA, 28.8 0.1 0.16
1189 BUCA, 30.6 0.0 0.00
1188 INFA, 24.3 0.2 0.32
1301 XXXX, 14.4 0.1 0.16
1175 MABI, 26.2 1.2 1.91
1168 XXXX, 52.3 1.2 1.91
1157 ROBO, 35.4 0.1 0.16
1152 XXXX, 22.1 0.3 0.48
1170 DAEX, 23.6 0.9 1.43
0
E Verde Plot 3
1586 XXXX, 24.5 0.1 0.16
1580 DAEX, 33.1 0.7 1.11
1581 DAEX, 29.1 0.9 1.43
1588 XXXX, 15.0 0.0 0.00
1594 MABI, 21.3 0.1 0.16
1740 DAEX, 22.0 0.3 0.48
1732 DAEX, 18.3 0.1 0.16
1681 MABI, 31.5 0.5 0.80
1675 DAEX, 23.1 1.4 2.23
1674 DAEX, 24.9 0.7 1.11
1693 CASP, 18.8 0.4 0.64
1720 DAEX, 45.0 0.2 0.32
1719 DAEX, 30.4 0.8 1.27
1726 DAEX, 22.4 0.3 0.48
1666 XXXX, 17.3 0.2 0.32
1664 XXXX, 27.3 0.3 0.48
1636 XXXX, 14.0 0.2 0.32
1644 MABI, 29.7 0.9 1.43
0