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Canopy Dieback in a New Zealand Mountain Beech Forest!

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Canopy Dieback in a New Zealand Mountain Beech Forest! Pacific Science (1983), vol. 37, no. 4 © 1984 by the University of Hawaii Press. All rights reserved Canopy Dieback in a New Zealand Mountain Beech Forest! J. P. SKIPWORTH 2 ABSTRACT: Accelerated mortality is attributed to an unusually high percent­ age of old trees, an abundance of pathogenic fungi, and a putative lowering ofwater tables in the 1960s. There is some evidence to suggest that this may be a cyclical phenomenon. MOUNTAIN BEECH (Nothofagus solandri var. in a decade, with perhaps two or three minor cliffortioides) is one of two varieties of a mast years in between. widespread indigenous New Zealand tree. Seedfall occurs in late summer or autumn, Particularly associated with mountain re­ and germination takes place the following gions, it is found over a wide range of gener­ spring. Seeds are dispersed by wind and are ally poor soils and is often the forest of the rarely thrown more than a few meters from timberline. The present study was undertaken the tree on which they originate. The chances on the northwest slopes of Mt. Ruapehu ofgermination and early survival seem much (39°16' S, 175°35' E), Tongariro National greater if the seed should fall in beech litter. Park, where mountain beech mortality ap­ Although seedlings soon become capable of pears to be high over substantial areas. The an annual increase in stem length of 30­ degenerate appearance of the forest, with 40 cm, the usual situation in a forest with a large numbers of dead trunks and inter­ closed canopy is for seedlings to enter a twining masses of silvery leafless lichen­ semidormant state during which height in­ covered branches, was not in evidence prior crease may be little more than 1 cm/yr. A to 1967, according to reliable local opinion mountain beech plant in a forest may there­ and as seen in aerial photographs. With a fore be less than 50 cm in height yet more view to explaining this situation, investiga­ than 20 yr old. Such a plant is of shrublike tions were undertaken in 1973. form and at an advanced growth stage. This semidormancy can be broken only by the advent of high light intensity, which usually occurs upon the death ofcanopy trees. Rapid GENERAL BIOLOGY growth characterized by strong apical domi­ As a result of detailed inquiries by Wardle nance follows, as poles are produced. Ulti­ (1970a, b, c, d, 1974), the general biology and mately, a single survivor will spatially replace ecological performance of mountain beech the tree whose death 100 or more years are well documented. In the context of ac­ previously allowed light to break the dor­ celerated mortality, however, some features mancy of perhaps dozens of young plants can appropriately be emphasized. Flowering near the forest floor. is an irregular phenomenon, and even when Stands are often of even age, and trees profuse is not necessarily followed by prolific therefore tend to reach the fragility of old seeding. Indications are that from the point age more or less simultaneously. A severe of view of production of an abundance of environmental stress such as a storm or viable seed, good years occur about once heavy snowfall may therefore kill a large percentage of trees in an aging stand. Nor­ mally, these would be replaced from the crop of young plants on the forest floor. Thus, 1 Manuscript accepted 5 October 1983. 2 Massey University, Botany and Zoology Depart­ once established, the phenomenon of even­ ment, Palmerston North, New Zealand. aged stands tends to be self-perpetuating. 391 392 PACIFIC SCIENCE, Volume 37, October 1983 TABLE 1 GENERAL SITE DESCRIPTION ALTITUDE SITE (m) ASPECT SLOPE GENERAL 1 1,320 NW 10° Damage light 2 1,240 NE 40° Near ridge top; steep 3 1,210 SW 8° Shady 4 1,120 NW 2° In continuous bush; widely representative 5 1,070 NW 1° Isolated copse 6 1,060 N 5° On stream bank 7 1,030 W 2° In continuous bush 8 890 Flat Part of large isolated stand Boring insects, particularly adults and Size distribution was similar at site 2, where larvae ofthe indigenous coleopteran Platypus 200 trees were sampled. There was a higher are known to attack dead and stressed trees number of seedlings than at any other site, (Miller 1971). In the presence of an excessive and most of them were at the advanced­ amount of dead wood, Milligan (1972) has growth stage. demonstrated that they will attack living trees At site 3, trees seemed to be younger. Of of Nothofagus fusca. A variety of fungal 182 only 3 were over 30 em and none were pathogens are associated with beetle tunnels over 40 em. There were relatively few in the (Faulds 1973); Armillaria is particularly im­ two smallest size classes. It seemed that plicated, and Milligan (1974) has described mortality had occurred at all ages. In fact, Platypus feeding on yeasts in the tunnel in each of the three classes represented by linings. more than 35 trees, the proportion dead was very similar (40.7%, 41.3%, and 35.1%). Relative to most other sites, seedlings were METHODS abundant. Trees from eight sites, chosen to encompass More trees might have been expected in a range of altitude and aspect and to include the three smaller size classes at site 4, where both severely damaged and relatively un­ 252 trees were sampled, 87 of which com­ affected stands (Table 1), were examined. prised a standing dead subsample. Mortality Measurements involved diameter at breast was not evident in the smaller classes, al­ height ofall trees over 2 m tall in each sample. though both subsamples revealed a dip in At sites 2, 4, and 8, trees were sampled by the histogram in the 35-40-cm class. Seed­ point quarter with centers along arbitrary lings, particularly young ones, were quite lines. At each of the other sites, all trees in well represented. variously circumscribed quadrats were evalu­ More than half of the 185 trees at site 5 ated. were dead though still standing, and in both All trees in a 50-m-square quadrat were subsamples there was a suggestion ofpaucity measured at site 1. There were 136 in total, among smaller classes and in the 25-30-cm including 8 recently dead but still standing. class. There were very few seedlings. As the histogram for site 1in Figure 1reveals, Site 6 was another at which there were there was generally an increase in the number virtually no larger trees. Of the 274 trees of trees in successively smaller classes, al­ measured, 57 were dead, and mortality though there were fewer than might be ex­ seemed spread throughout the size classes. pected in the 25-30-cm class. There was no No small seedlings were noted, although sign of small beech seedlings, although some there were some young plants at the shrub advanced-growth plants were present. stage. WI4i Canopy Dieback in a New Zealand Mountain Beech Forest-SKIPWORTH 393 40 40 CD ® ® @ 136 (8) 200 (26) 182 (64) 252 (87) 20 20 20 20 25-30 25-30 35-40 ® ® (1) ® 185 (104) 274 (57) 84 (84) 209 (34) 20 40 20 20 25-30 25-30 35-40 30-35 FIGURE 1. Histograms showing size class distribution at each of eight sites. Vertical axes = number of trees; horizontal axes = size classes (5-cm-diameter at breast height intervals); solid blocks = living trees; open blocks = standing dead trees; stippled blocks = total living and standing dead trees (sites 1 and 2); total number of trees at each site is given below each site number, with number of standing dead trees given in parentheses. All 84 trees were dead at site 7, where again there were no trees in the smaller classes and DISCUSSION an evident scarcity in a medium-sized group The numbers of trees in the smaller size (30-35 cm). More trees than at any other site classes, and by inference younger age classes, fell into the larger size classes (over 30% were are low or even nonexistent. In a forest type in excess of 40 cm). There was no sign of any where even-aged stands are not atypical, this individual less than 15 cm. is no real surprise although it does suggest At site 8, 209 trees were measured. Once that recruitment had been low for some more there seemed a partial lack oftrees both decades prior to the 1960s. It also implies in the smallest classes and that embracing that over this period the forest had been an 30-35 cm. The majority of the dead trees aging one with light mortality, but mortality were small. Some seedlings were present. must have greatly accelerated by 1970. No attempt was made in the field to collect Even when trees from two atypical healthy information pertaining to the physical envi­ sites are included, 464 (30.4%) of the total ronment. Records for precipitation at Cha­ standing trees evaluated (1522) were dead and teau Tongariro (within 10 km of each site) perhaps a further 10% were dying. Although are complete from 1937. Available informa­ dead trees doubtless remain standing for tion to 1972 provides an annual mean of several years, the value is greatly in excess of 2481 mm. Rainfall had evidently been less the general figure of 3% per year determined toward the end of the period: in 1968-1972, by Wardle (1970d). It also seems fair com­ the average annual mean was 8.8% lower than ment that the forest investigated was old, in the previous 25 yr, and summer rainfall certainly in relation to "mixed-age" stands was 8% lower during 1960-1969 than during described by Wardle (1970d).
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